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HomeMy WebLinkAbout12112013 Minutescnf HOME OF PELICAN ISLAND SEBASTIAN CITY COUNCIL MINUTES REGULAR MEETING WEDNESDAY, DECEMBER 11, 2013 - 6:30 P.M. CITY COUNCIL CHAMBERS 1225 MAIN STREET, SEBASTIAN, FLORIDA The Regular Meeting was called to order by Mayor Bob McPartlan. 2. Invocation was given by Pastor Dave Newhart, St. Elizabeth's Episcopal Church. 3. The Pledge of Allegiance was led by Council Member Gillmor. 4. ROLL CALL City Council Present: Mayor Bob McPartlan Vice Mayor Jim Hill Council Member Jerome Adams Council Member Richard Gillmor City Council Absent: Council Member Andrea Coy (excused) City Staff Present: City Manager, Al Minner City Attorney, Robert Ginsburg City Clerk, Sally Maio Administrative Services Director, Debra Krueger Community Development Director, Joe Griffin Finance Director, Ken Killgore Deputy Police Chief, Greg Witt Network Manager, Rob Messersmith Regular City Council Meeting December 11, 2013 Page Two 5. AGENDA MODIFICATIONS Modifications and additions require unanimous vote of City Council members Mayor McPartlan listed several requested agenda modifications: • Item 6.C. — IRC Commissioner Tim Zorc will not be in attendance and will reschedule in January. • Move Presidential Streets item to New Business 12.H. as a contract award for Tim Rose (see new agenda backup for Tim Rose Contract in revision packet) • Add Workforce Solutions Agreement to Consent Agenda 7.1. (see new agenda backup for Tim Rose Contract in revision packet) There were no Council objections to the modifications. 6. PROCLAMATIONS, AWARDS, BRIEF ANNOUNCEMENTS Presentations of proclamations, certificates and awards, and brief timely announcements by Council and Staff. No public input or action under this heading. 13.175 A. Presentation of Plaque Expressing Gratitude of City Council to Al Minner, City Manager Mayor McPartlan read and presented the plaque to Mr. Minner on behalf of City Council, stating that Mr. Minner excelled during a very bad economy and led the City through it to the other side in great shape. Mr. Minner thanked City Council, said he was sorry Ms. Coy was not present, appreciated their trust in him as City Manager, that he never took his responsibility lightly, said that Sebastian is a great community, is a very special place and will always be close to his heart. He said the people he worked with are special and hoped Sebastian was better for him being here. 13.122 B. Presentation of Certificate of Completion by Mayor McPartlan to Council Member Adams — Florida League of Cities and Florida Institute of Government 2013 Advanced Institute for Elected Municipal Officials McPartlan read and presented the Certificate of Completion to Mr. Adams. 13.176 C. Indian River County Commissioner Tim Zorc — Presentation to City Council - Economic Development Positioning Initiative Indian River County Commissioner Tim Zorc was unable to attend and will reschedule. 13.177 D. Kevin Lowry — Update on Pelican Island Wildlife Refuge Pioneer Festival to Celebrate the 150th Birthday of Paul Kroegel the Nation's First Refuge Manager — January 9, 2014 Kevin Lowry gave a brief PowerPoint presentation on the planned festival which will celebrate Paul Kroegel's 150th birthday and be an authentic representation of pioneer life with food, hands-on activities, and a proclamation by Mayor McPartlan and German dignitaries, attended by the Kroegel/Timinsky family on January 9, 2014 from 10 am and 3 pm at Fisherman's Landing on Indian River Drive (see PowerPoint presentation attached). 2 Regular City Council Meeting December 11, 2013 Page Three E. Brief Announcements i. Friday, December 20, 2013 - Sebastian Police Department Shop with a Cop Program - Volunteers Needed and Donations to Officer Ashley Penn ii. Saturday, January 4, 2014 - Craft Club in Riverview Park Saturday, January 11, 2014 - Sebastian River Art Club in Riverview Park Mayor McPartlan read the above announcements, noting that Sebastian Police Officer Penn has reported that they did so well with fundraising that they have canceled this weekend's planned fundraising and were able to accommodate a busload of local children for the "Shop with a Cop" program. He also reported on the successful bell ringing for the Salvation Army last Saturday with proceeds all staying in Sebastian and commended Ms. Coy for organizing that. He then announced the upcoming Police Department Citizens Academy (see program outline attached) and urged citizens to participate. Mr. Gillmor said the Sebastian River Art Club and Sebastian Craft Club will be together in Riverview Park this weekend. Mr. Gillmor asked to speak on his item relative to the Indian River Lagoon at this time and requested a workshop on January 15, 2013. He said he had spoken to various members of Council prior to his election and members of ORCA. He said Brian LaPointe is available that date. Mr. Hill said he was not opposed to a workshop, that we have had a lot of meetings discussing the lagoon, but we lack data on Sebastian waters, and suggested we do something now to see what is in the water before we decide what to do to make it better. Mr. Gillmor responded that is why he wants the workshop, to have the people who make the Kilroys show us what they do. Mr. Hill said they should direct the City Manager to come back at the next meeting, a process of how to test the waters, maybe it will be Kilroys or whatever it may be. He said they could wait until the 15th or go ahead now and find out what it is. He suggested they could have the City Manager commission a study to find out what pollutants are there and the source, suggesting taking a certain amount of funds out of reserves to accomplish this. Mr. Gillmor said he was on board 100%, but suggested they have the experts come in and talk to them, that he had spoken with Edie Widder, ORCA and she is excited about doing something in Sebastian, and there are funding avenues available, noting Mr. Wright said St. Johns River Water Management District may have funding. He said he wanted to see what the Kilroys will do. Mr. Hill said if we have a meeting on the lagoon, the workshop should be based on studying and finding out what the issues are and then base the speakers on what types of research is out there and how the City can find out what is going on. Mr. Gillmor said so moved. Mr. Hill said he did not want to get into another multi -hour discussion on what to do to solve a problem when we don't know what the problem is. Mayor McPartlan suggested that maybe we could spend $100K to conduct a study, but we want the most bang for the buck, and suggested maybe the County would want to get on board with us. Mr. Gillmor reiterated the Brian LaPointe can be here on January 15 and he can get in touch with Edie Widder. Regular City Council Meeting December 11, 2013 Page Four Mr. Adams suggested this be done at a regular meeting rather than workshop. Mr. Hill said the idea of a workshop is not to take up hours of time at a regular meeting and it will be broadcast live. The City Manager said consider it done and said he will make sure Mr. Griffin does homework on details and cost analysis of dollars available. 7. CONSENT AGENDA All items on the consent agenda are considered routine and will be enacted by one motion. There will be no separate discussion of consent agenda items unless a member City Council so requests; in which event, the item will be removed and acted upon separately. if a member of the public wishes to provide input on a consent agenda item, he/she should request a Council Member to remove the item for discussion prior to start of the meeting or by raising his/her hand to be recognized. A. Approval of Minutes — November 13, 2013 Regular Meeting 13.162 B. Cancel Purchase of Three Chevrolet Caprice Police Package Vehicles from Alan Jay Fleet Sales and Move to Authorize Purchase Same Vehicles from Stingray Chevrolet Under Florida Sheriff's Association State Contract Number 13-21-0904 in the Amount of $104,841 (PD Transmittal, FSA Bid Award) 13.178 C. Authorize Purchase of One Chevrolet Tahoe Police Package Vehicle from Alan Jay Fleet Sales Under Florida Sheriff's Association State Contract Number 12- 20-0905 in the Amount of $32,847 (PW Director Transmittal, FSA Bid Award) 13.171 D. Approve Purchase of MIS Network Switch Equipment (14 HP ProCurve 2920 Series Layer 3 Switches) in the Amount of $19,357.75 Under State Contract Price and Further Reduction Due to Negotiation (MIS Transmittal, GovConnection Quote) 13.171 E. Approve Purchase of MIS Storage Array (Dell PowerVault MD 32001) in the Amount of $16,632.10 under State Contract (MIS Transmittal, Dell Quote) 13.057 F. Approve Neel -Schaffer Continuing Services Agreement #65 — Tulip Street Drainage Project Design in the Amount of $32,200 (City Manager Transmittal, CSA 65) 13.179 G. Approve Neel -Schaffer Continuing Services Agreement #66 — Riverfront Stormwater Plan in the Amount of $40,000 (City Manager Transmittal, CSA 66, Proposal) 13.180 H. Approve Neel -Schaffer Continuing Services Agreement #67 — Washington Street Outfall Payable from the Presidential Street Project Fund (City Manager Transmittal, CSA 67, Aerial) Workforce Solutions Agreement (added to agenda — see agenda backup in revision packet) The City Manager noted in regard to item 7D MIS Network Switch, that the MIS Network Manager Rob Messersmith had been able to find another source of the HP equipment which is CDWG, reduced the cost by about $760 for a total cost of $18,641.61. N Regular City Council Meeting December 11, 2013 Page Five MOTION by Mr. Hill and SECOND by Mr. Gillmor to approve the Consent Agenda as amended. Mr. Adams noted a typo on page nine that should be 2014 rather than 20014. Roll Call: Ayes: McPartlan, Hill, Adams, Gillmor Nays: None Passed: 4-0 (Coy Absent) 8. COMMITTEE REPORTS & APPOINTMENTS City committee reports and Council Member regional committee reports. No public input or action except for City committee member nominations and appointments under this heading. 13.166 A. Citizens Budget Review Advisory Board (City Clerk Transmittal, At -Large Applications, Press Release, Member List) i. Confirmation of Five Council Appointees (Applications on File & Residency Verified) ii. Interview, Unless Waived, and Submit Nominations for Two At -Large Members with Terms to Expire November 2014 Council Appointees announced by City Clerk: Mayor McPartlan — Tim Slaven Vice Mayor Hill — Gary O'Hara Council Member Adams — Ed Herlihy Council Member Coy — Dionna Farmer Council Member Gillmor — Bill Flaherty At -Large Member Nominations: City Clerk said that Christine Vicars was not able to be at the meeting but is very interested in serving. City Council interviewed Bruce Hoffman and Bob Zomok. Mr. Hill nominated Mr. Hoffman and Ms. Vicars to continue serving. Mr. Adams seconded the nomination. No other nominations were made. Ms. Vicars and Mr. Hoffman were appointed. Other Committee Reports Mr. Adams reported on his recent Treasure Coast Council of Local Governments meeting, citing a decrease in unemployment rates in Indian River County to 8.0% and industries gaining the most jobs in the Sebastian area retail trade, professional and business services, education and health services, and leisure and hospitality, and overall unemployment rate is now 6.6%, and the country is currently 7.0%. 9. PUBLIC HEARINGS - None 10. UNFINISHED BUSINESS 13.168 A. Memorandum of Understanding for Interim City Manager Joe Griffin (City Manager Transmittal MOU) The City Manager said it was important to memorialize the relationship with Mr. Griffin in his appointment as interim City Manager, outline his responsibilities, allow him to participate in the permanent City Manager recruitment process, and protects his current position as Community Development Director. He said a couple of blank areas need to be determined. Regular City Council Meeting December 11, 2013 Page Six Mayor McPartlan asked Mr. Griffin if he would be continuing to wear all the hats as Community Development Director, Airport Director and Economic Development Director and add interim City Manager. Mr. Griffin said that was correct. Mayor McPartlan suggested at least a 20% increase from his current salary. Mr. Hill suggested 50% of the difference between Mr. Griffin's salary and Mr. Minner's salary, suggesting recruitment may be a very short process. Mr. Adams asked if there is a salary range for the position of City Manager. The City Manager said there is not a range, said 20% is pretty close, and that the City Manager should be the highest paid employee, and as interim suggested it should be higher than the highest paid employee, which is the Chief whose package is at $104,422' and put it at $1 dollar above that amount. Mr. Hill made a recommendation to fill the blank in with that number, one dollar more than whatever the Chief's is. Mr. Gillmor seconded the recommendation. The City Manager, in response to Mr. Adams, said there is a paragraph in the MOU that provides that Mr. Griffin continues his tenure and benefits. MOTION by Mr. Hill and SECOND by Mr. Gillmor to approve the Memorandum of Understanding with the dollar figure to be $1 more than the next highest paid employee within the City. Damian Gilliams, 1623 US 1, asked what Mr. Griffin is making now. The City Manager responded about $85,000, the Chief makes about $104,422, and he makes about $115,000. Mr. Gilliams said Joe is a good man, but has never been a City Manager or Assistant City Manager, he'd like to see him get the job, and put off a search until we give him a chance to prove himself, but just because the Chief makes more doesn't mean you need to give somebody more, he might take this job for far less if asked. Mr. Griffin said these kinds of discussions are personally embarrassing, said he will be taking on additional duties, Council will be given enough scrutiny on his performance that if he can't hack it Council will get him out of there. He said this is a risk for him and does want to apply as City Manager because of his love and his vision for the community, said he appreciates the opportunity and will do his best. Roll Call: Ayes: Hill, Adams, Gillmor, McPartlan Nay: None Passed 4-0 (Coy Absent) * [Editor's note: number was actually $100,422 - number in MOU to be $100,423 for Mr. Griffin] 13.082 B. Contract Award Recommendation for Airport Main Street Access Road Project — Appropriate $166,163 from DST Funds —Award Airport Drive East Improvements to Mancil's Tractor Service in the Amount of $926,739 — Award Golf Course Storage Building Construction Contract to C & S Companies in the Amount of $512,968 and Authorize City Manager to Execute Both Contracts (Community Development Director Transmittal Bid Materials Budget Detail Plan) The City Manager said one of the biggest things the City has done for Economic Development is to develop the airport and we have done well with Mr. Griffin's direction, and described the two components of the Airport Drive East development, to move the 0 Regular City Council Meeting December 11, 2013 Page Eight dirt pile and existing Golf Course maintenance building to accommodate future development on the east side of the airport. He said this was bid out in two phases and some engineering estimates were low, so we are a little shy on funds. He asked for approval of the Airport Drive improvement to Mancil's Tractor Service for $926,739, an allocation of $166,163 from DST funds to augment, noting Exhibit C shows how dollars are being moved around, and a 5% contingency in the amount of $76,500 in case budget parameters don't meet during the construction and hopefully it will be returned, and award of the Golf Course building to C & S Companies in the amount of $512,968. He said the total project cost is $1.6M and is augmented with FDOT and FAA grant funds, and said DST is a strong fund for the City of Sebastian and we are spending that for capital improvements. MOTION by Mr. Hill and SECOND by Mr. Gillmor to approve $166,163 additional funding for the Main Street Access road project to be transferred from DST funds, also to award the Airport Drive East improvement construction project to Mancil's tractor service in the amount of $926,739, authorize the City Manager to execute the subject contract, and award the Golf Course storage building construction contract to C & S Companies in the amount of $512,968 and authorize the City Manager to execute the subject contract. Damian Gilliams congratulated Mr. Griffin for the first big one he brought into the community, grant money from FAA and FDOT. Mr. Hill called a point of order Mr. Gilliams continue saying he wanted to thank Mr. Griffin for doing a good job of bringing our fair share of tax moneys from the federal government to Sebastian, and maybe Mr. Griffin can get it started, saying this is important for the community. Mr. Adams said there are quite a few items that were not allowed by FAA and was concerned about the bids that came in which were so much higher than we expected and asked if it was possible to rebid and remove those items. The City Manager said staff can't explain why the engineers estimate was off, maybe a sign of the times, at this stage this has been bid twice already, and we are comfortable with where they are, and have shifted funds so we can afford the project with reasonability. Mr. Griffin said with FAA grants there has to be an independent fee estimate submitted, we submit the bids to FAA and they have to have another consultant look at it and it has to be within 8-10%. He said that happened with the road bid and those were the numbers he had which were worked up 4 to 5 years ago, and the numbers turned out higher than those bids, and it may be the improving economy and other factors. He said he was very comfortable that we have market bid prices that we can rely on. The City Manager discussed shifting DST funds, which may be seen as being done cavalierly, but that shifting funds typically is done to save money. Roll Call: Ayes: Adams, Gillmor, McPartlan, Hill Nays: None Passed: 4-0 (Coy absent) 7 Regular City Council Meeting December 11, 2013 Page Eight 11. PUBLIC INPUT Bruce Zingman said he is very proud of everyone in the City for their participation in the Christmas parade, thanked Chief Morris, Officer Parker, Officer Marcinik who had all Police volunteers helping, Chris McCarthy, Antoine Van Meir, Jerry Converse and City workers, American Legion, VFW, GFWC for the Santa House, SPOA, Clerks office, Chamber of Commerce, churches, schools, scouts, athletic groups and businesses, and Council and citizens. Mayor McPartlan thanked Mr. Zingman, and said it was a wonderful weekend with Friday's Light Up Night, Salvation Army bell ringing for Sebastian at Wal-Mart, the Pearl Harbor Day observance, the Christmas parade and thanked Mr. Zingman again and SPOA for the parade. Jim Sunnycalb, Sebastian, thanked the City Manager and wished him good luck, and reported on Christmas Eve events planned in Riverview Park, where he and his son will team up with Seth Goldsmith and Coastal Community Church his church with trains around the City tree starting at 2 pm, Santa Claus, treats and Imani Milele children's choir from Uganda singing around 6 pm. Mayor McPartlan said he had heard the Imani choir and urged people to go see them perform. Mr. Gillmor said they are great and highly recommended. Damian Gilliams congratulated all on their elections, said it was his fourth time running, and people were interested in what he was saying, thanked Mr. Gillmor for getting the lagoon on the workshop, discussed a variance on December 2nd regarding drainage, the Captain on the river he said broke every code in the LDC, that Mr. Gillmor brought pictures of illegal dumping into our river and Council rewarded with six variances. He asked why the community leaders are afraid to speak against this, proper notice was not given, and staff indicated it was done properly. He said we are looking to spend hundreds of thousands for Kilroys, when other communities put blackouts on fertilizing during the rainy season. He said maybe Kevin Lowry should have been here on this, anc Ms. Coy took hundreds of dollars in campaign contributions the month before, and he thought she wanted to save Sebastian. Mr. Hill called a point of order, stating we have rules and Roberts Rules of etiquette would also apply here that a person giving public input is not to personally attack any of the public officials or staff or anyone in the City, and it is cowardice to attack someone who is not here, and that kind of comment should cease and desist. Mayor McPartlan said Mr. Gilliams' time was up and asked him to have a seat. Mr. Gilliams continued to speak and Mayor McPartlan continually asked him to take a seat. Mr. Gilliams wished the City Manager good luck, and Mayor McPartlan asked Deputy Chief Witt to show Mr. Gilliams the door. Mr. Gilliams continued to yell from the back of the room that the legislature allows the public to speak as he was escorted out. Mayor McPartlan called recess at 7:38 p.m. and reconvened the meeting at 7:49 pm Regular City Council Meeting December 11, 2013 Page Nine Ben Hocker spoke on the diagonal parking across from Hiram's and said we were supposed to get a sidewalk from the property owner but did not get it. He suggested a change to compact car parking only because it is turning into billboards for trucks parked there and their bumpers are in the roadway. He said the incident he just witnessed on our agenda referring to a time limit, says the City Council may extend or terminate an individual's time by a majority vote of Council and did not see that occur. Mayor McPartlan said he agreed with Mr. Hocker on the parking, that trucks do extend out there and maybe we could look into that matter. 12. NEW BUSINESS 13.170 A. Resolution No. R-13-41 — Authorizing Issuance of Note of City to Refund the Infrastructure Sales Tax Bonds (Administrative Services Transmittal Analysis of Responses to RFP Prepared by FirstSouthwest Company) A RESOLUTION OF THE CITY OF SEBASTIAN, FLORIDA, ACCEPTING A PROPOSAL OF HANCOCK BANK AND APPROVING THE FORM OF A LOAN AGREEMENT WITH HANCOCK BANK; AUTHORIZING THE REFUNDING OF THE CITY OF SEBASTIAN, FLORIDA INFRASTRUCTURE SALES SURTAX REVENUE BONDS, SERIES 2003 AND 2003A; AUTHORIZING THE ISSUANCE OF A PROMISSORY NOTE PURSUANT TO SUCH LOAN AGREEMENT IN THE AGGREGATE PRINCIPAL AMOUNT OF NOT EXCEEDING $3,100,000 IN ORDER TO EFFECT SUCH REFUNDING; AUTHORIZING THE REPAYMENT OF SUCH NOTE FROM PROCEEDS OF THE INFRASTRUCTURE SALES SURTAX REVENUES; DESIGNATING SUCH NOTE AS A QUALIFIED TAX-EXEMPT OBLIGATION WITHIN THE MEANING OF SECTION 265(B)(3) OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED; DELEGATING CERTAIN AUTHORITY TO THE CITY MANAGER AND CITY CLERK; AUTHORIZING THE EXECUTION AND DELIVERY OF AN ESCROW DEPOSIT AGREEMENT AND APPOINTMENT OF AN ESCROW AGENT THERETO; AND PROVIDING FOR AN EFFECTIVE DATE FOR THIS RESOLUTION. The City Attorney read Resolution No. R-13-41 by title, and noted there were non - substantive amendments as part of the additional agenda packet. The City Manager said these were comments from the bank, said this does not require extended terms, will save a significant amount of money, recommend approval, and said financial advisors were present to answer questions. MOTION by Mr. Adams and SECOND by Mayor McPartlan to approve Resolution R-13- 41. The City Attorney clarified that the motion is to approve "as amended". Roll Call: Ayes: Gillmor, McPartlan, Hill, Adams Nays: None Passed: 4-0 (Coy Absent) 13.170 B. Resolution No. R-13-42 —Authorizing Issuance of Note of City to Refund the Stormwater Utility Bonds (Administrative Services Transmittal Analysis of Responses to RFP Prepared by FirstSouthwest Company) A RESOLUTION OF THE CITY OF SEBASTIAN, FLORIDA, ACCEPTING A PROPOSAL OF HANCOCK BANK AND APPROVING THE FORM OF A LOAN AGREEMENT WITH HANCOCK BANK; AUTHORIZING THE REFUNDING OF THE CITY OF SEBASTIAN, FLORIDA STORMWATER UTILITY REVENUE BONDS, SERIES 2003; AUTHORIZING THE ISSUANCE OF A PROMISSORY NOTE PURSUANT TO SUCH LOAN AGREEMENT IN THE AGGREGATE PRINCIPAL AMOUNT OF NOT EXCEEDING $3,200,000 IN ORDER TO EFFECT SUCH REFUNDING; AUTHORIZING THE REPAYMENT OF SUCH NOTE FROM PROCEEDS OF THE STORMWATER FEE REVENUES; DESIGNATING SUCH NOTE AS A QUALIFIED TAX-EXEMPT OBLIGATION WITHIN THE MEANING OF SECTION 265(B)(3) OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED; DELEGATING CERTAIN AUTHORITY TO THE CITY MANAGER AND CITY CLERK; AUTHORIZING THE EXECUTION AND DELIVERY OF AN ESCROW DEPOSIT AGREEMENT AND APPOINTMENT OF AN ESCROW AGENT THERETO; AND PROVIDING FOR AN EFFECTIVE DATE FOR THIS RESOLUTION. 6 Regular City Council Meeting December 11, 2013 Page Ten The City Attorney read Resolution No. R-13-42 by title and said this resolution has also been amended as the previous one had. The City Manager said this will save just over $30K per year and will retire in 2022 the same as the last. MOTION by Mr. Gillmor and SECOND by Mayor McPartlan to approve Resolution No. R-13-42 as amended. Roll Call: Ayes: McPartlan, Hill, Adams, Gillmor Nays: None Passed: 4-0 Coy Absent. 13.181 C. Resolution No. R-13-40 Parking -in -Lieu Agreement for 1550 Indian River Drive (Community Development Transmittal R-13-40 Attached Agreement) A RESOLUTION OF THE CITY OF SEBASTIAN, FLORIDA, APPROVING PARTICIPATION IN THE PARKING IN LIEU OF PROGRAM, LIEN AGREEMENT AND COVENANT RUNNING WITH THE LAND, FOR ROBERT AND TINA MARIE GIAMBANCO FOR PROPERTY LOCATED AT 1550 INDIAN RIVER DRIVE, SEBASTIAN, FLORIDA; PROVIDING FOR TERMINATION, - PROVIDING FOR CONFLICTS; AND PROVIDING FOR AN EFFECTIVE DATE. The City Attorney read Resolution No. R-13-40 by title. Mr. Griffin gave a brief background on the application from Mr. and Mrs. Giambanco who purchased the prior Sebastian Entertainment Center, and who are seeking a parking -in - lieu of agreement for eight parking credits in the amount of $25,600 financed over 10 years at about $450 per month starting January 1St MOTION by Mr. Hill and SECOND by Mr. Gillmor to approve Resolution No. R-13-40. In response to Mr. Adams, Mr. Griffin said the finance charge is set out in the ordinance adopted about three years ago, and that the Giambancos have agreed to the 3.5%. In response to Mr. Gillmor, Mr. Griffin said if they paid cash or borrowed the money elsewhere there would be no finance charge, but they were comfortable doing it this way. Mr. Gillmor said this parking program points to the creativity of our City Manager and our interim City Manager. Mr. Griffin said this will add to our fund and we can create more public parking. Roll Call: Ayes: Hill, Adams, Gillmor, McPartlan Nays: None Passed: 4-0 (Coy Absent) 13.010 D. Resolution No. R-13-43 — Quarter Budget Amendment (Administrative Services Transmittal, R-13-43 Quarterly Financial Report Quarter Ended September 30 2013) A RESOLUTION OF THE CITY OF SEBASTIAN, INDIAN RIVER COUNTY, FLORIDA, AMENDING THE BUDGET FOR THE FISCAL YEAR BEGINNING OCTOBER 1, 2012 AND ENDING SEPTEMBER 30, 2013 AS PROVIDED FOR IN EXHIBIT "A"; PROVIDING FOR CONFLICTS; AND PROVIDING FOR AN EFFECTIVE DATE. The City Attorney read Resolution No. R-13-43 by title. MOTION by Mr. Hill and SECOND by Mayor McPartlan to approve Resolution No. R-13-43. Roll Call: Ayes: Adams, Gillmor, McPartlan, Hill Nays: None Passed: 4-0 (Coy Absent) 10 Regular City Council Meeting December 11, 2013 Page Eleven 13.117 E. Conlon % Round Contract Amendment (City Manager Transmittal Conlon Proposal) The City Manager said we are in a contract with Conlon Landscaping for Quarter round installation and fifteen percent of the time he exceeds the eight foot cross section which was bid out, and recently it has occurred more frequently and he does not want to absorb the loss, so they met and mutually agreed and a proposal for those costs was provided, and does not exceed the budgeted amount for the contract. He said when the contract expires and is rebid, we will have two line items in the bid docs. He said the numbers are reasonable and mutually beneficial. MOTION by Mr. Gillmor and SECOND by Mr. Hill to approve staff's recommendation. In response to Mr. Hill, the City Manager said it rare that we get below the 8 foot sections, it goes wider at least 15% of the time and narrows up 2% of the time, and sometimes it can go up to 15 to 20 feet. Roll Call: Ayes: Gillmor, McPartlan, Hill, Adams Nays: None Passed: 4-0 (Coy Absent) 13.032 F. Review/Approve Stormwater Master Plan — Frank Watanabe Neel -Schaffer (City Manager Transmittal) The City Manager recapped the history of the development of the Stormwater Master Plan which was last presented by Mr. Watanabe in February, that the biggest concern Mr. Watanabe had was for the quarter round installation because though it has been successful with drainage, it does convey a little water, and he wanted to make sure we have retention areas to contain water and can continue. He said the quarter round report was included and does provide data that the water is not being conveyed too quickly. He said we are asking Council to finally adopt the updated Stormwater Master Plan and use it to guide us in stormwater management. He said if approved, Mr. Watanabe will take the plan to SJRWMD for their blessing and we will then have a Stormwater Master Plan with formal approval including quarter round. Frank Watanabe gave a PowerPoint presentation (see PP attached — the Stormwater Master Plan was not provided in the original agenda packet and is attached as distributed by email on December 6, 2013). He said this is mostly a validation of the plan from the 2004 to today, highlighted some of the projects completed in recent years, briefly described the function and testing of quarter round saying it does percolate and does not convey fast enough to cause a concern, noted an error in the presentation noting funding for the Tulip project is $186K and not $198K as stated. Mr. Gillmor asked if the old FDOT drainage pipes would pass muster today and Mr. Watanabe said in past discussions about outflow, FDOT had said that the pipe and right- of-way were not theirs and now because of the issues and discussions regarding the Washington outfall, they are forced to address openly and now FDOT is claiming it is their pipe and are getting more involved. Mr. Adams thanked him for his very detailed report and said he is learning a lot. He asked if we won't proceed with quarter round until we get SJRWMD approval. Mr. Watanabe said SJRWMD approved quarter round as an experimental project and we should have had more dialogue with them but studies show it has not conveyed a lot of 11 Regular City Council Meeting December 11, 2013 Page Twelve water and percolates down in swales, and they are welcome to review what we have, their role is to approve improvement projects, and he did not think they will say no but wish we had discussions earlier. The City Manager said we may not have had dialogue with SJRWMD, but there have been no violations, the City is ahead of the curve on drainage, it is self -policing, we are going back to SJRWMD, and it is good for the environment and the community. He said ultimately we will get all the quarter round in place but the question will be, how will we fund it. He said there is a 20 year plan to get it installed throughout the City broken into $.5M funding sections, so it will be based on funding and need, and will need $8M in funding. In response to Mr. Adams, the City Manager said there have been sections that have become dislodged and there will be routine maintenance costs, which has always been a problem for Sebastian. He provided information on how the quarter round idea was brought to the City by former Public Works Director, Terry Hill, who brought him to Port St. Lucie to see theirs. He described the issues they have dealt with since the inception of the quarter round program, and said we have a maintenance cleaning contract in place and will need to expand that contract going forward. In response to Mr. Adams, Mr. Watanabe described the nutrients that the new baffle boxes will collect including nitrogen and phosphates, noting the TDML grants require us to use those for the Presidential Streets project and said the life of the screening fabric in the boxes is five to six years. MOTION by Mr. Hill and SECOND by Mayor McPartlan to approve the Stormwater Master Plan. Roll Call: Ayes: McPartlan, Hill, Adams, Gillmor Nays: None Passed: 4-0 (Coy Absent) 13.082 G. Discuss Workshop for Indian River Lagoon Workshop — Requested by Council Member Gillmor (Transmittal Letter) This workshop had been scheduled for January 15th earlier in the meeting. 13.079 H. Presidential Streets — Tim Rose Contract The City Manager quoted Jim Nantz who said "At Long Last" in regard to golf and said the Presidential Street project is equivalent to that statement, the project went through hurdles, design, budget, shifting funds, waiting for grant funds and recently two issues have arisen, the Washington Street outfall and the Peden protest in regard to the outfall where it enters the lagoon at his property, but now an agreement has been reached with the property owner and based on Council approval which was given tonight, the City and FDOT will share costs to fix the problem in the amount of $7500. He said hurdle #2 is that the engineering estimate was under on the Presidential Streets project, noting Coolidge was an add-on, but the cost to do all four streets would be $1.3M and we have $795,702 available to us and our recommendation is to move forward, and not do Coolidge at this time in the amount of $370,000 and reprogram the funding for fiscal year 2015 with new monies that will come forward from CRA and DST, and move forward with Martin, Washington and Cleveland at this time, and delay slip -lining, and change out some specs on drainage pipe to plastic. 12 Regular City Council Meeting December 11, 2013 Page Thirteen He recommended authorizing him to execute the construction contract with Tim Rose Construction in the amount of $890,702, which will incorporate an allocation from the Cavcorp project in the amount of $277,782, which funding was never closed out, and an allocation of $95,000 from DST, and project contingency in the amount of $41,931. He noted all costs are outlined on page 83 of the revision packet (see page 83 attached to minutes) (the revised packet is found in Laserfiche with the original agenda packet) MOTION by Mr. Hill and SECOND by Mr. Adams to move staff recommendation. Mr. Hill asked if Tim Rose was the low bidder on Coolidge Street and the City Manager said they were the low bidder on all the project streets. Roll Call: Ayes: Hill, Adams, Gillmor, McPartlan Nays: None Passed: 4-0 (Coy Absent) 13. CITY ATTORNEY MATTERS The City Attorney thanked Mr. Minner for an exceptionally good working environment, his ability to work with an administrator on a high level, and said the citizens have been well served since his arrival in 2005. 14. CITY MANAGER MATTERS 13.079 A. Presidential Streets Update (No Backup) Moved to New Business H. Updates The City Manager updated Council on a repair to the Creative Playground bridge and said it should be complete and open in two weeks. The City Manager reported on deteriorating condition of some of the wood walking surface on the pedestrian bridges, particularly near Hardee Park, due to the fact that it is not a high graded treated lumber and the inability to drain. He said they are in the process of engineering a solution such as support beams, and the bridges are currently safe, though unsightly. He said Mr. Griffin will get back to Council with a number. He closed by expressing his appreciation for working with Council and staff, that Council should be proud of their staff, and that he will miss them and Sebastian will remain in his heart. 15. CITY CLERK MATTERS The City Clerk wished Mr. Minner and his family good luck in Leesburg, said she knew long time City Clerk Betty Richardson would be there to help, and said she was amazed at his brilliant mind and what he brought to the Council, especially the financial issues and what he was able to do. 13 Regular City Council Meeting December 11, 2013 Page Fourteen 16. CITY COUNCIL MATTERS A. Council Member Gillmor Mr. Gillmor said Mr. Minner has done an excellent job in a tough environment, and we have him to thank for the excellent fiscal shape Sebastian is in, and wished that all his drives be straight. B. Council Member Adams 13.182 i. Letter Re: Sober Homes Regulations (Transmittal Letter) Mr. Adams said as a member of the Florida League of Cities Policy Committee, he had received a copy of a report regarding sober homes regulations, and sought support of Council to draft a letter to the State urging the need for regulation, via Florida League of Cities which will send all letters together. Mr. Hill said he thought it was a great idea, but asked the City Attorney if this was a home rule issue. The City Attorney said he was not sure but it would depend on the way in which the State would undertake the regulation. He said with any luck they will do it through local government processes, and local government would have better ability to deal with it better than the State would. Mr. Hill said the fact that FLC is undertaking this would protect the home rule issue, because his concern if the State gets it, it could get to the place that the State would require us to allow this, noting this would be a zoning issue, and would support the letter. Mr. Gillmor said this was on the Legislative agenda last year, and did not make it, and he can see where unregulated, and someone has six or seven people living there could be problem if unregulated, and was for the letter. Mayor McPartlan said to the City Manager go ahead and draw up the letter. 13.183 ii. Discuss Conducting Ethics Seminar in Sebastian (No Backup) Mr. Adams said he would like us to conduct an ethics training in Sebastian, noting the Florida legislature recently required Constitutional officers to have training each year. He said he would prefer to do the training at City Hall and open to the public, perhaps conducted by FLC. Mr. Hill said he would be a lot more comfortable individually dealing with the issue through the City Attorney than in an open meeting, and said it is incumbent upon each individual to get training which is available on-line. Mr. Gillmor said every Council member has been to FLC IEMO and Advanced IEMO training and if we extend on-line training it would be more appropriate, and include committee members. The City Attorney said it would be appropriate for committee members to participate. Mayor McPartlan said he takes the on-line training every year and did not think we needed an open forum. 14 Regular City Council Meeting December 11, 2013 Page Fifteen Mr. Adams said at the last meeting we adopted a ban of sale of e -cigarettes to under 18, and was curious to know if merchants have to display them behind the counter and do they card individuals. The City Attorney responded they must be moved to not be readily accessible. Mr. Adams asked how they are displayed and said he saw a display out on a counter. The City Manager asked him to send him or Mr. Griffin an email and he would notify Code Enforcement to visit with a copy of the ordinance. Mr. Adams wished Mr. Minner well, said he hated to see him go, he had learned quite a bit, and it was a pleasure working with him. He wished him a Merry Christmas and Happy New Year. C. Council Member Co A/V staff played a video from Ms. Coy expressing her wishes for Mr. Minner and his family in Leesburg, and her thanks to him for everything he did for Sebastian, and wishing everyone a happy holiday, Merry Christmas and Happy New Year. D. Vice Mayor Hill Mr. Hill thanked Mr. Minner for making Council look good, the City has been in really good hands, and the good that they have done is mostly due to his leadership, appreciated what he has done for our community, and wished everyone a Happy New Year, Merry Christmas and Happy Chanukah. E. Mayor McPartlan Mayor McPartlan said Mr. Minner was a terrific City Manager and great man, wished him and his family well in Leesburg, hoped he would come back and visit and let us know how he is doing. He said Christmas and spirit are alive based on the generosity shown last weekend in Sebastian, urged people to go to Riverview Park on Christmas Eve to see the Imani Choir, which will give you a feeling about what Christmas is and should be, the spirit is alive in Sebastian and he is proud to be a part of this community. 17. Being no further business, Mayor McPartlan adjourned the Regular Meeting at 9:06 p.m. Approved at the January 8, 2014 Regular Council Meeting. B. Y., � Bob McPartlan, Mayor L s ✓ C� --- Sally A. MaioMM , City Clerk l 15 �j 2 v 0 a 4 C,Q CIS .� 4-6 \ Ln 0 O LLILLM IM4W cc WCL .� rgop) LLI0�- a a V � i t 0- U V O O O J Q m .; �w Lh J P-�m r_"V 1 SEBASTIAN CITIZENS POLICE ACADEMY What is it? The Citizens Police Academy is a twelve (12) week program designed to provide a working knowledge and background of the Sebastian Police Department. This program is intended to foster a closer relationship between our agency and the community. It provides an avenue for community involvement and provides first hand experience of policing. Purpose The Citizens Police Academy is intended to develop a harmonious working relationship between members of the community and law enforcement while at the same time opening a mutually supportive avenue for communication. It is an opportunity for citizens to learn more about their local law enforcement, ask questions, and gain a more thorough understanding of the inner workings of the Sebastian Police Department. The Academy is also a means for participants and police personnel to share information and ideas about the police profession. The Academy also provides for improved community/police relationships, enhanced cooperation and reduced stereotyping. Academy Topic and Courses Some of the topics and activities attendees will participate in include: ➢ Welcome to Sebastian Citizens Police Academy by Chief of Police ➢ Facility Tour of Police Headquarters ➢ Departmental Organizational and Philosophy ➢ Community Policing and Problem Solving ➢ Professional Standards and Accreditation ➢ Police Officer Recruitment, Selection, and Training ➢ Criminal Law and Laws of Arrest ➢ Court System and Hearing Process ➢ Road Patrol Division Operations ➢ Traffic Enforcement, Traffic Laws, Child Passenger Laws, Accident Reconstruction, and DUI Enforcement ➢ School Resource, D.A.R.E., GREAT, and RAD Kids Programs ➢ Crime Prevention Techniques ➢ Criminal Investigations and Drug Enforcement ➢ Crime Scene Investigations and Evidence Processing ➢ Records Management ➢ Communications Division ➢ Mobile Data Terminal Operations ➢ Use of Force, Defensive Tactics, and K-9 Demonstration Homeland Security Issues ➢ Tour of Indian River County Jail Facility ➢ Community Volunteer Program, Child ID's and other special programs ➢ House Checks and Alarm Permits ➢ Marine Patrol and Fish and Game ➢ Firearms Care and Safety ➢ Special Response Team (SRT) Presentation and Demonstration ➢ Code Enforcement ➢ Citizens Police Academy Graduation SEBASTIAN CITIZENS POLICE ACADEMY Who should attend the Citizens Police Academy? All qualified citizens in the area, members of service organizations, members of business associations, members of the media, college student's & potential law enforcement applicants, and any and all other interested parties. What are the requirements to attend the Citizens Police Academy? Persons must be at least 18 years of age, and meet all requirements set forth on the application for the Sebastian Citizens Police Academy. Final approval of applicants will be made by the Chief of Police or his/her designee. Interested applicants under the age of 17 must be accompanied by a parent or legal guardian and are subject to approval. When is the Citizens Police Academy held? Twelve consecutive weeks beginning on Thursday, January 16, 2014, through Thursday, April 4th, 2013. Class sessions are scheduled to begin promptly at 6:30 each evening and will be two hours in duration depending on course topic. Where is the Citizens Police Academy held? The Citizens Police Academy is held at the Sebastian Police Department Headquarters, at 1201 Main Street, Sebastian, Florida and other selected locations, transportation is the responsibility of the applicant. Why should I attend the Citizens Police Academy? The academy will help you learn and understand more about the Sebastian Police Department, and become more involved in your community. Everyone who attends the Citizens Police Academy returns to their communities as an informed citizen capable of using their newly acquired knowledge to help improve the conditions and quality of life in their community. Various volunteer opportunities are available to Citizens Police Academy graduates. How much does the Citizens Police Academy cost? There is no cost to attend the Citizens Police Academy. Upon completion of the Citizens Police Academy, members will be awarded a "Certificate of Graduation". How can I apply to attend a Citizens Police Academy? We are only able to support 30 persons per class, so make sure you apply using our application available at the Sebastian Police Department, www.sebastianpd.org, or contact Community Policing Specialist Officer Steve Marcinik at 589-5233 to receive an application by mail. If you are not one of the first 30 applicants, we will place you on a standby list in the event a position becomes available or notify you for the following year from the date your application was received. SEBASTIAN CITIZENS POLICE ACADEMY Citizen Police Academy Notes, Rules and Regulations 1. Classes and activities will start promptly at the designated time on the course schedule. Please be on time, and be prepared to participate. If you are unable to attend a class session, please contact Officer Steve Marcinik at 589-5233 as soon as possible prior to class. 2. We recommend that casual, comfortable clothing be worn for all classes. Tank tops, bathing suits, and revealing clothing are not appropriate. Your attire should be in good taste and represent the proper appearance. 3. Students will not bring any kind of weapon(s) into the Police Department. This is for the safety and security of students and instructors. 4. "Participant" ID badges will be distributed during the first class. Students will wear their badge at all times while in the Police Department. Please report any lost, stolen, or damaged badges to Officer Steve Marcinik or the administration. 5. Every effort will be made to ensure that there is a short break during the classroom session. Students may, at any time, leave the room to use the restrooms. Bathrooms are located in the hallway. 6. Students may eat and drink in the classroom, but please leave the classroom the way you found it. Drink machines are located in the break -room. 7. Students are encouraged to participate in the classroom discussion and offer their perspective on the subjects under discussion. Through participation we all benefit from the ideas and brainstorming. 8. Evaluations will be conducted throughout the Citizens Police Academy to assess the strengths and weaknesses of the instruction to improve future classes. Please, be honest with your instructors on the evaluations. 9. Upon completion of the Citizens Police Academy, students will be awarded a "Certificate of Graduation". APPLICATION SEBASTIAN CITIZENS POLICE ACADEMY PERSONAL INFORMATION (PLEASE PRINT) Name: Date of Birth (Last) (First) (Middle) Home Address: , (No P.O. Boxes) (Number) (Street) (City) (Zip) Email Address: Home Phone: Drivers License #: State: OR last 4 digits of Social Security Number XXX-XX- How did you learn of the citizens Police Academy? EMPLOYMENT INFORMATION Occupation: Length of Employment: Company Name: Email: Employers Address: (Number) (Street) (City) (Zip) Work Phone: Supervisor's Name: Briefly explain why you wish to be enrolled in the Sebastian Citizens Police Academy: COMMUNITY ACTIVITIES List all community organizations in which you have been or are currently involved. Include leadership positions: LAW ENFORCEMENT CONTACT Have you ever been arrested: (not an automatic disqualifier) Yes No If yes, give details, including offense, date of arrest, and disposition of your case(s). PHYSICIAN INFORMATION IN CASE OF AN EMERGENCY: NAME: TELEPHONE #: ADDRESS PERSON(S) TO BE NOTIFIED IN CASE OF AN EMERGENCY: NAME: TELEPHONE #: (Please Print) ADDRESS: NAME: TELEPHONE #: (Please Print) ADDRESS: LIST MEDICAL CONDITIONS THAT MAY BE OF CONCERN DURING ATTENDANCE AT THE ACADEMY: (Applicants name- Please Print) (Date) (Signature of Applicant) APPLICATION AGREEMENT AND WAIVER SEBASTIAN CITIZENS POLICE ACADEMY Please review the following carefully. Read and initial the following statements before signing this application. Incomplete or unsigned applications will not be accepted. I certify that there are no willful misrepresentations, omissions or falsifications in the foregoing statements or answers. I understand that any omissions or false statements on this application shall be sufficient cause for rejection or dismissal from the Sebastian Citizens Police Academy after enrollment. (Initial) I further understand and hereby authorize the Sebastian Police Department to make any investigation of my personal history deemed necessary for consideration to attend the Citizens Police Academy. I understand that this background investigation may include, but is not limited to criminal history. (Initial) I understand that even if I am a Concealed Handgun License holder or become licensed during the course of the academy, I will not carry any weapon(s) into the class or to any Citizens Police Academy or Citizens Police Academy Alumni Association function. I understand that to do so is cause for immediate dismissal from the program. (Initial) I hereby state that I will disclose any convictions of any felony offense, domestic violence offense, and sexual assault, crimes against children, narcotics or weapons offense. I further attest that I am not currently under indictment for any offense nor do I knowingly associate with any individuals whom I believe to be convicted of, under investigation or indictment for any felony, not excluding narcotics, weapons, or assault offenses, by any law enforcement agency. I understand that I may be dismissed from the Academy if my behavior is deemed to be disruptive or if it otherwise inhibits the concept of this Citizens Police Academy (Initial) I, the undersigned, a private person, for and in consideration of the privilege of participating in the Sebastian Citizens Police Academy, and recognizing that such activity involves certain inherent dangers do hereby agree to assume the risks attendant to such activity, to include motor vehicle accidents on either pubic streets or private property, and do hereby release the City of Sebastian, its officers, agents, representatives and employees, in both their public and private capacities, from any and all liability claims, suits, demands, damages, including attorney's fees, or causes of action, for any and all claims, personal injury or property damage, that I, or my heirs, successors, and assigns may have or may hereafter acquire against the City of Sebastian, including but not limited to: 1) motor vehicle accidents on public streets or private property; 2) personal injury or property damage that may arise from the acts of a third person; 3) personal injury or property damage that may arise from the negligent acts of the City of Sebastian, its officers, agents, representatives, or employees relative to my participation in the Sebastian Police Department Citizens Police Academy; and/or 4) wrongful death claims. (Initial) It is further agreed that the execution of the release shall not constitute a waiver by the City of Sebastian of the defense of governmental immunity (Initial) (Signature) (Print Name) (Date) (THIS MAYBE NOTORIZED BY YOUR LOCAL LAW ENFORCEMENT OFFICER WHEN TURNING IN THE APPLICATION) Before me, , the undersigned signed authority, on this day personally appeared known to me to be the person whose name is subscribed to the foregoing instrument, and acknowledged to me that he executed the same for the purpose and consideration therein expressed. GIVEN UNDER MY HAND AND SEAL OF OFFICE, This day of Notary Public in and for Indian River County, Florida 200_ Return completed application to Officer Steve Marcinik Sebastian Police Department 1201 Main Street, Sebastian, Florida 32958 SEBASTIAN POLICE DEPARTMENT IMAGE RELEASE AND WAIVER I, the undersigned, parent or legal guardian, hereby release and hold harmless the Sebastian Police Department and the City of Sebastian, and its officers, employees and agents, from and against any and all claims for damages, cost, third party claims, judgments and expense to persons or property that may arise out of, or be occasioned by the use of photograph or reproduction of the image on film or video of the applicant. I understand and acknowledge that the photograph or reproduction of the image of the applicant will be used for non-commercial purposes. I further understand and acknowledge that the photograph or preproduction of the image of the applicant may be exhibited in the print media, on the police department's website and on television as part of public service and informational announcements associated with the agency. I also understand that upon exhibition of the photograph or reproduction of the image of the applicant, it will be made part of the public domain and the police department cannot control any unauthorized or secondary use or distribution of the photograph or reproduction of the image of the applicant by third parties not associated with the agency. I further state that my consent for use of the photograph or reproduction of the image of the applicant as stated above has been given freely and voluntarily. I have not been promised anything in exchange for my consent to use the photograph or reproduction on the image of the applicant as stated above. Print Name of Applicant Signature Print Name of Parent or Legal Guardian Signature Date ra 4-j ro L V 4- 0 r W 4--j m 0 4-j W ^con W m M 0 N JJ1 n� W �E W V 0 Storm Water 2004 Master Plan • Existing 2004 master plan • Field review to verify drainage system • Used new GIS map for the system • Two drainage systems (Northern area and Southern) • Create new hydrologic parameters • Analyzed the system with Interconnected Channel and Pond Routing (ICPR) model • Add into the system aoo6-zoic city CIP drainage improvements • Revised model per stage flow and capacity • Identified storm water deficiencies and improvement projects 2006 to 2017D=N­aAr�-va�gE Improvements i. Davis Street Drainage and Baffle Box a. Periwinkle Detention Pond 3. Quarter round swale liners (annual) 4. Stormwater Park Pond -Detention System 5. George Street Drainage improvement 6. Collier Canal Seawall and dredging (northern section) 7. Potomac Drainage Improvement 8. Various citywide drainage pipe repairs (annual) g. Citywide ditch mowing and trimming (annual) z m im x jr7q 0 M , op. 7. 7l'— City of Sebastian George Street Drainage Improvement Design, Permitting and Construction Support Installation of 500 feet of 36" ERCP, 700 feet of 72" CMP and Box Structure Completion Date: March 2010 NEEL—SCHAFFER Solutions you can build upon GWOF HOME OF PELICAN ISLAND i1 -t i efl Al r r� 4NVISI NVJI13d 30 3WOH Nor— UD uodn pl!nq uQ� nc.A suoo;n#oS M3=1=I dH:)S_133N t + v r --mot 1 J j i, � 40Z Ain :azea uoijoldwoo :poddnS uoilan.i1suoo pue 6ulll!w.iad `uB,saa jueweAo rdwi eft uie to pue jaaa;S 3ewo;od uepsegeS jo Aj!o Quarter Round Testing Before and After Test Dry and wet condition 3000 gallons for simulation Test shows water movement ® Twice the distance of runoff FVIA. Ole 4511 r 1 w � Ir w- 3 { CO ,F Improvements ` Cleveland, Martin and Washington Streets • Street and Drainage Improvements • Replace grass Swale with pipe along Indian River Dr. • Adding baffle boxes ERWIN c Z Q J tJ7 z Q V J W CL L0LA- 0 CW C e Storm Water I m prove md_ht_P'roj Ods 2013-2033 1. A - Indian River Drainage Improvements $2,000,000 2. B - Collier Canal Hardy Dam $ 1007000 3. C - Potomac Ave Lateral Pipe (48") $ 2007000 4. D — Blossom/Wentworth Ditch Piping $13000,000 5. E — Stonecrop Culverts —Bevan/Laconia $1,000,000 6. 1 — Future South Area Basin $ 300,000 7. J — Southeast Dredge Basin $ 500,000 8. K - Tulip Pipe Replacement (42"x72") $ 100,000 9. L — East/West Lateral Line Pipe $ 500,000 10. M — Tulip Drainage Improvements $ 2507000 11. N — George St. Dredging $215001000 12. O — Rosebush Drive Pipe — Twin 48" $ 100,000 13. P — Landdowne Drive Pipe — Twin 48" $ 100,000 Total Drainage Construction $8,650,000 Annual Maintenance F — Replace CMP — Maintenance $ 200,000 G — Quarter Rounds $ 250,000 H — Backyard Ditches Maintenance $1,000,000 Total $1,450,000 DECEMBER 11, 2013 CITY COUNCIL AGENDA PACKET REVISIONS For Agenda Item 12A — Resolution No. R-13-41 Infrastructure Sales Tax Bonds Revised Resolution R-13-41 (clean copy) pg 2-11 Blacklined Resolution showing only revised pages pg 12-14 For Agenda Item 12B — Resolution No. R-13-42 Stormwater Utility Bonds Revised Resolution R-13-42 (clean copy) pg 15-22 Blacklined Resolution showing only revised pages pg 25-26 For Agenda Item 12F — Review/Approve Stormwater Master Plan Stormwater Master Plan (black and white copy) pg 27-76 Appendix Quarter Round Testing pg 77-80 For Agenda Item 14 - Presidential Streets Update Presidential Streets Bid - Tim Rose - City Manager requests it be pg 81-124 moved from Manager Matters to New Business For Item 16B.i. — Adams - Sober Home Regulations Draft Letter pg 125-126 New Item Workforce Solutions Agreement - City Manager is asking pg 127-131 for action during Agenda Modifications to add to Consent Agenda City of Sebastian Stormwater Management Master Plan Update MCT HOME OF PELICAN ISLAND December 6, 2013 Prepared by: 111_ HEEL—SCHAFFER = Solutions you can built! upon Frank Watanabe Date PE FL 66735 NEEL—SCHAFFER 5ofutfons you can build upon Table of Contents December 6, 2013 1. Introduction....................................................................................... 3 i. Background ii. Purpose iii. Modeling Approach 2. Data Collection and Methodology..................................................... 9 i. Meetings with City of Sebastian and Project Identification ii. Field Review Drainage Improvements from 2006 to 2012 iii. GIS Data Collection iv. Hydrologic Model v. Hydrologic Parameters a) Topographic Data b) Hydrologic Unit Areas c) Time of Concentration d) Curve Numbers e) Boundary Conditions of South Prong Sebastian River f) Soils Data vi. Hydraulic Parameters a) Existing Structure Inventory b) New Structure Inventory since 2004 c) Modification of Existing ICPR Model 3. Engineering Analysis and Stormwater Deficiencies .......................... 17 i. Stormwater Model Analysis ii. Level of Service iii. Deficiency Areas iv. Best Management Practices 4. Storm Water Quarter Round Program ............................................... 44 i. Testing and Analysis of Quarter Rounds 5. Conclusion and Findings...................................................................49 i. Storm water Improvement map Appendix Quarter Round Testing Calculations • ICPR3 Model Run in separate Technical Binder Sebastian Stormwater Master Plan Update Page 2 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon 1. Introduction December 6, 2013 i. Background The City of Sebastian started as a river front fishing haven for only a few dozen pioneers in the late 1800's, expanding over the years due to its ideal fishing location and treasure — laden coastline. The current population is approximately 22,000. The City is located in the northern section of Indian River County adjacent to the St. Sebastian Rivers and the County limit. Sebastian is 95 miles Southeast of Orlando and 12 miles north of the City Vero Beach or approximately midway through the east coast of the Florida Peninsula between Melbourne and Vero Beach in an area known as the Treasure Coast. This location known as "The Treasure Coast," is street accessible by US 1, 1-95, the Florida Turnpike. In February 2011 the City of Sebastian, Florida, contracted with Neel -Schaffer Inc. (NSI) to update the north and southwest area of an existing stormwater model originally developed by Camp Dresser & McKee Inc. (CDM) in 2004 --- Master Stormwater Management Plan (MSWMP). The City of Sebastian, by way of the South Prong of the St. Sebastian River, drains to the Indian River Lagoon. The existing stormwater model parameters will be used as a base to create a new 2012 drainage model using the Interconnected Channel and Pond Routing version 3 (ICPR3) to verify the previous study and provide an update to storm water improvement projects. The ICPR3 model is an engineering software tool to solve problems of flood routing through complex networks of interconnected and hydraulically interdependent stormwater ponds using basins, nodes and links. In addition to the ICRP, ArcView (software application that provides extensive mapping, data use, and analysis, along with simple editing and Geo - processing capabilities) and ArcGIS (comprehensive name for the current suite of GIS products used to create, import, edit, query, map, analyze, and publish geographic information) will be used to update the existing storm water model mapping. As noted, the original drainage model developed in 2004 had a base model developed in 1996 by Craven Thompson & Associates. The consulting firm CDM was retained to develop the original model to identify Citywide drainage improvements. In 2010, Neel - Schaffer, Inc. was retained to update the model based on recent drainage improvements and changes in FEMA topographic data files. The extent of the new model is shown in ICPR Model Boundary (page 5). As part of the drainage update, the City's current implementation of the "Quarter Round" program was incorporated into this report. Quarter Rounds are plastic pipes cut into quarters. A quarter of the pipe is installed along the existing residential drainage swales to assist in managing storm water runoff and filtering of pollutants. This program was initiated in 2006 as an experimental project by St John's River Water Management District (SJRWMD). ii. Purpose Florida receives on average 40 to 60 inches of rain each year, with less than one inch of rainfall each time it rains; however the state also experiences torrential downpours and hurricane rains. These cause runoff carrying sediment, fertilizers, pesticides, oil, heavy metals, bacteria, and other contaminants to enter surface waters, causing adverse effects from increased pollution and sedimentation. Sebastian Stormwater Master Plan Update Page 3 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 According to the Florida Department of Environmental Protection Agency (FDEP), the Florida's stormwater regulatory program requires the use of Best Management Practices (BMPs) during and after construction to minimize erosion and sedimentation and to properly manage runoff for both stormwater quantity and quality. These BMPs are control practices that are used for a given set of conditions to achieve satisfactory water quality and quantity enhancement at a minimal cost. Each type of BMP has specific application, installation, and maintenance requirements that should be followed to control erosion design of these control measures, such as those established by the Florida Department of Environmental Protection (FDEP), Florida Department of Transportation (FDOT) or other recognized organizations. Stormwater management is a critical component for the control of runoff and pollution. The existing stormwater model data base was used to develop the new drainage parameters for the modeling. These parameters include sub -basin boundaries, input conditions, new information using FEMA elevations, soil characteristics and input from new City stormwater projects. These parameters were used to analyze the previous drainage model and to create the stormwater updates. Therefore, the purpose of the MSWMP is to inventory and characterize the Previous Stormwater Management System (PSWMS), update select hydrologic parameters of the basin, update the existing stormwater model, identify areas that have indicated flooding and develop alternatives to alleviate both flooding and water quality problems. The study objectives addressed the following: • Updating the existing stormwater model to represent the current hydrologic and hydraulic conditions within the basin. This included incorporating several previous models into a single model, incorporating approximately 80 culverts and 5 bridges not represented in the original model, modifying the system storage represented in the model, incorporating the St. Johns River Water Management District's (SJRWMD) design of the regional stormwater park into the stormwater model, verifying and modifying select channel cross sections, calculation of existing, and future land use curve numbers and modification of hydrologic unit boundaries. • Evaluating the existing capacity and the future demand of the PSWMS by establishing the proper level of service, and determining the system's deficiencies based upon local criteria. • Developing alternative improvements (structural and non-structural) and providing recommendations for reducing system deficiencies. • Developing a master plan that prioritizes the recommended alternatives with individual preliminary engineering cost estimates. • Prioritizing areas for water quality retrofit and consider these areas in the design of stormwater improvements for flooding. Geographic Information Systems (GIS) data was gathered from the required county government agency to create new maps with the most up to date information. Meetings with the City of Sebastian, field reviews of the existing drainage network, and drainage analysis using ICPR3 model were conducted to better understand the existing drainage Sebastian Stormwater Master Plan Update Page 4 NEEL—SCHAFFER S.1.0ons ynu r n build upon December 6, 2013 system. As a result NSI provided a summary of stormwater deficiencies and provide a list of future stormwater improvements. It is noted that in order to obtain accurate data, the whole City was analyzed using GIS. The time of concentration, stage/storage relationships, and sub -basins were calculated for the entire City. iii. Drainage Patterns The City of Sebastian is located between the South Prong of the Sebastian River and the Indian River Lagoon in Indian River County, Florida. The City is approximately 13.4 square miles or 8,600 acres. The modeling extent or area of study is approximately 9.3 square miles. Low-density residential land use consists of 6.2 square miles. There is a coastal ridge along the eastern edge of the City and slopes down to the Indian River Lagoon. The sand is permeable allowing rainfall to percolate rapidly through the soil. However, majority of the City is located to the west of the coastal ridge and is flat. The average slope is less than 0.1 percent and the average elevation is approximately 20 feet above Mean Sea Level (MSL) [reference point used as a standard for determining terrestrial and atmospheric elevation or ocean depths and is calculated as the average of hourly tide levels measured by mechanical tide gauges over extended periods of time]. Soil conditions to the west of the coastal ridge are virtually impermeable and rainfall does not easily ercolate throw h the round but V g g remains as standing water until it evaporates. Stormwater runoff generated in much of the City discharges to the South Prong of the Sebastian River (South Prong). The City is drained by a series of major canals which outfall in seven discrete locations to the south Prong. The secondary and tertiary (system of rocks) systems tributary to these major canals tend to be back lot line ditches (secondary) and side yard swales or pipes (tertiary). Upstream of the City, the South Prong is controlled by the Sebastian River Water Control District (SRWCD). A radial gate dam is located just south of the Scithwest corner of the City and controls the surface discharge of approximately 35,000 acres. Downstream of the City, the South Prong is more influenced by tidal and storm surges that emanate for the Indian River Lagoon. Fifty-two percent (52%) of the Predominant ;and uses in the City itself are low density, while 14 percent are open and 11 percent are wetlands. Sebastian Stormwater Master Plan Update Page 5 dill II n 1 SEBASTIAN ILNEEL-SCHAFFER UPDATED DRAINAGE V g g remains as standing water until it evaporates. Stormwater runoff generated in much of the City discharges to the South Prong of the Sebastian River (South Prong). The City is drained by a series of major canals which outfall in seven discrete locations to the south Prong. The secondary and tertiary (system of rocks) systems tributary to these major canals tend to be back lot line ditches (secondary) and side yard swales or pipes (tertiary). Upstream of the City, the South Prong is controlled by the Sebastian River Water Control District (SRWCD). A radial gate dam is located just south of the Scithwest corner of the City and controls the surface discharge of approximately 35,000 acres. Downstream of the City, the South Prong is more influenced by tidal and storm surges that emanate for the Indian River Lagoon. Fifty-two percent (52%) of the Predominant ;and uses in the City itself are low density, while 14 percent are open and 11 percent are wetlands. Sebastian Stormwater Master Plan Update Page 5 NEEL-SCHAFFER S.1.0ons yvu r n 6u1lu upon Sebastian 2013 Drainage Map December 6, 2013 Sebastian Stormwater Master Plan Update Page 6 NEEL-SCHAFFER S.1.0ons yvu r n 6u1lu upon December 6, 2013 d � �VNI ,. � l RSS 4LIiC-, d j PE �'i 4MAE �+ FI 1FiE SEBASTIAN NEEL—HAFFER UPDATED DRAINAGE MAP .oufa��.�v=•�u��re �aQA Fi:�41F QF FFE,ICAH', BN91 Sebastian Stormwater Master Plan Update Page 7 'Ffli I i� � � �'�� ,,ISL= �_ ;��r ■ I d � �VNI ,. � l RSS 4LIiC-, d j PE �'i 4MAE �+ FI 1FiE SEBASTIAN NEEL—HAFFER UPDATED DRAINAGE MAP .oufa��.�v=•�u��re �aQA Fi:�41F QF FFE,ICAH', BN91 Sebastian Stormwater Master Plan Update Page 7 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon iv. Modeling Approach December 6, 2013 The modeling approach consisted of updating a single regional model of the City of Sebastian. The modeling approach utilized a combination of programs to calculate the best data and update the report. Shape files were gathered from government websites such as Saint Johns River Water Management District, USDA, and FEMA. The shape files were input into ArcView and using hydrologic data such as: area, elevations, and stages were gathered. Using the ArcView information, the time of concentration was calculated. [Hydrology is the science that encompasses the occurrence, distribution, movement and properties of the waters of the earth and their relationship with the environment within each phase of the hydrologic cycle. The hydrologic cycle is a continuous process by which water is purified by evaporation and transported from the earth's surface (including the oceans) to the atmosphere and back to the land and oceans.] The report created by CDM in 2004 used an advanced Interconnected Pond Routing model (ICPR) version 3.0 developed by Streamline Technologies Inc. In addition, City storm water projects from 2004 to the present were provided by the City of Sebastian for the northern and southern portion of the City and were incorporated into the new ICPR drainage modeling. After putting together information such as stage, storage and time of concentration, the modeling was updated using Interconnected Channel and Pond Routing 3 (ICPR3). The Interconnected Channel and Pond Routing Model (ICPR) is a modeling tool that has been used for over 25 years and successfully solves problems of flood routing through complex networks of interconnected and hydraulically interdependent stormwater ponds. It is listed with the Federal Emergency Management Agency (FEMA) as a Nationally Accepted Hydraulic Model and is applicable to almost any type of terrain. The model now includes hydrodynamic modeling of channel and pipe systems and has a fully integrated hydrology component. The three primary building blocks in ICPR are Basins, Nodes and Links. Stormwater runoff hydrographs are generated for basins and then assigned to nodes in the drainage network. Nodes are used to represent ponds and specific locations in the drainage network such as along channels, streams, rivers, and junctions in pipe systems. Stages are calculated at each of the nodes. Links such as pipes, channel segments, weirs (a small dam in a river or stream), and bridges are used to connect nodes together. Flow rates are calculated for links based on stages at nodes. The City in coordination with DEP and SJRWMD implemented a City's Stormwater Park within the center of the City on a 166 -acre area known as Adam's Parcel. This facility is intended to provide water quality treatment to surface water in the City's Stormwater Management System that was previously untreated. Additionally, the City is also preparing a stormwater master plan for the Sebastian Municipal Airport. A copy of that master plan is available at the City Public Works Office. Sebastian Stormwater Master Plan Update Page 8 NEEL—SCHAFFER 5ofutfons you can build upon 2. Data Collection and Methodology December 6, 2013 L Meetings with City of Sebastian and New Project Identification To initially understand the drainage system within these areas, a meeting was held with the City of Sebastian and field reviews were conducted to identify new drainage sections since the original model was developed in 2004. The following is a summary of the meeting held with the City of Sebastian: Meeting on March 10, 2011 • Initial meeting with City staff regarding mapping and files. • The City provided mapping and location of drainage projects constructed since the previous drainage modeling in 2004. • Create new IRCP model since the previous CDM model files were not available. • Revise the model per 2004 projects and generate new storm water projects. Data collection and research was also performed to gather all the necessary data files to create the files using ArcGIS. GIS Shape files (.shp) were collected in March 2011 from several different sources: Saint Johns River Water Management District (SJRWMD), Indian River County Property Appraiser, Federal Emergency Management Association (FEMA), Natural Recourses Conservation Service (NRCS), and the United States Geological Services (USGS). With these files in place new curve numbers for both existing and future land use conditions can be determined to update the new model. Using information and the existing sub basin maps from the original CDM report, a model run was performed. ICPR version 3 was used to create the model. Field Review Existing Drainage Improvements I Field reviews were conducted to identify the drainage improvements in the City since 2004. Per the City's direction there were six stormwater project sites. Each site was visited to verify installations and take note on drainage improvement for the modeling. The following is a summary of the stormwater projects and what they consist of: 1. Twin Ditches: Project location: Ditches located between Main Street and Airport Drive/Brush Foot Drive from Fig Street to Wimbrow Drive. Converting the existing double ditch system to a Best Management Practice wet detention treatment system. Twin Ditches Slormwaler Retrofit 40-061-98504-1 o a o 2004 Digital Ortho Quadrangle AW>�lz�.z�s Sebastian Stormwater Master Plan Update Page 9 NEEL—SCHAFFER December 6, 2013 S.1.0... yvu r n b.bd upon 2. Davis Street Baffle Box 2006: • Project Location: Street drainage improvement for Davis Street Area which included the outflow from US Highway 1 and the Indian River Lagoon. • Retrofit project involved the installation of a street drainage pipes and a Nutrient Separating Baffle box and associated piping from an area of approximately 96 acres of light commercial and residential land. In addition, the project eliminated a direct discharge of untreated stormwater into the Indian River Lagoon. 3. Collier Canal 2008 • Project Location: Collier Canal dredging and seawall improvements from the Barber Street Park/Hardy Dam near Main Street and CR 512. • Project consisted of retrofitting the existing canal seawalls with 3:1 back slopes. Project also consisted of dredging the canal bottom to lower the bottom elevation approximately 6 feet. 4. Periwinkle Stormwater Basin 2006 • Project Location: Residential area adjacent to Periwinkle Street and other streets. • Project involved the installation of a 3:1 wet detention pond, drainage improvements, passive recreation park and a monitoring plan for the drainage treatment. • The project was well accepted by the nearby residents as a positive improvement to the community. 5. George Street Drainage 2010 • Project Location: George Street within the residential neighborhood • Consisted of retrofitting the existing open drainage ditch with a new drainage pipe and street drainage crossing upgrade at George Street. 6. Potomac Drainage Improvement 2011 • Project Location: Potomac Avenue at Roseland Road in City/County. • Consisted of retrofitting the existing drainage ditch with new drainage pipe, street drainage crossing and new nutrient baffle Box. Sebastian Stormwater Master Plan Update Page 10 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon iii. GIS Data Collection December 6, 2013 GIS data collection was obtained from the SJRWMD website on March of 2011. SJRWMD maintains an up to date data collection from governmental websites. The district periodically updates the GIS Download Library as new data becomes available. This data included: FEMA, topo (topographic) data, United States Geological Survey (USGS) data, population characteristics data among others. Once files were downloaded they could be imported into ArcView and data analysis could begin. ArcView GIS is a desktop geographic information system (GIS) from Environmental Systems Research Institute, Inc. (ESRI). A GIS is a database that links information to location, allowing you to see and analyze data in new and useful ways. iv. Hydrologic Model NSI used the ICPR version 3.0 stormwater model. The model has three methods for generating stormwater runoff: the Soil conservation Service (SCS) unit hydrograph method, the Santa Barbara method, and the Overland Flow method. The SCS unit hydrograph method was selected by the City. The ICPR model has two components to determine the volume and rate of stormwater runoff. The first component is based upon the amount of Directly Connected Impervious Area (DCIA) to the stormwater system represented by a percentage of the contributing area. The resulting runoff from rainfall over the DCIA does not pass over any pervious area and thus does not infiltrate into the soil. The second component consists of the impervious areas and pervious areas that are not directly connected to the PSMS and thus are subject to infiltration. The SCS unit hydrograph method uses a Curve Number (CN) and a time of concentration (tc) to determine the runoff volume and timing from this second component. The CN method relates rainfall to direct runoff as a function of soil type and land use cover. The curve number and time of concentration methodologies are fully documented in the National Resource conservation Service's (NRCS) Technical Release 55 (TR55). v. Hydrologic Parameters a) Topographic Data The study area consisted of detailed 2 -foot topographic contour data; therefore, the hydrologic boundaries from the 2004 Study were modified significantly. Please refer to the attached topographic map showing the 2 -foot contours (Figure: WOOLPERT 2 -foot Aerial Topographic Data). Generally, the extent of the hydrologic boundaries consisted of combining multiple basins loading to a single node into a single basin. However, there was an exception, the basin named "BRIAR". Due to new data obtained, the basin was brand new and the data obtained was inconclusive as to whether it drained into our study area or node water should flow to. It is noted that the basin "BRIAR" is part of the southern area of the City and it is not modeled in the ICPR3 report. An additional survey is recommended for this basin. It was determined that much of the area that was previously assumed in the 1996 Study to load to the City's Primary Stormwater Management system (PSWMS), in fact discharges directly to the South Prong of the Sebastian River. b) Hydrologic Unit Areas The model extent of the City was divided into sub basins that have been further subdivided into smaller hydrologic units based upon existing drainage patterns (see Figure: Hydrologic Unit Location Map). The previous report by CDM, had a total of 204 hydrologic units. For our modeling purposes, the study area was subdivided into 216 Sebastian Stormwater Master Plan Update Page 11 NEEL—SCHAFFER Sofut?o you c n 8ufld upon December 6, 2013 hydrologic units for which areas and time of concentration were compiled. The hydrologic units averaged approximately 45 acres in size with a minimum of 3.8 acres and a maximum of 155 acres. c) Time of Concentration The time of concentration (tc) is the time stormwater runoff takes to travel from the hydraulically (operated by, moved by, or employing water or other liquids in motion) most distant point of the watershed to the point of outflow from an area taking into account the length of time required for the following: • Sheet flow - one in which the horizontal dimensions are much larger than the vertical extent; The maximum sheet flow length should be no greater than 125- 150 feet; • Shallow concentrated flow - after a maximum of 300 feet shallow flow usually becomes shallow concentrated flow. This 300 foot value has since been revised down to a maximum of 150 feet on very uniform surfaces; • Open channel and/or pipe flow — This occurs within swales, channel streams, ditches and piped storm drainage systems. Complete documentation of this methodology is available in various publications such as NRCS' TR -55 publication and SJRWMD's Technical Publication (TP) 85-5. During model development several tc's appeared to be inconsistent with the hydrological unit size and apparent flow length specified in the previous report. New tc's were calculated based on the new 2 -foot topo data and compared with the original. Overall approximately 95 percent of the tc values of the hydrologic units were updated in ICPR3. The original and updated tc values are shown in Table 2-1: Hydrologic Units and Time of Concentration. d) Curve Numbers The curve numbers, which are used to determine how much of the rainfall will be converted to runoff, were calculated based on both the land use and hydrologic soil group distribution in each hydrologic unit. For the purpose of this study, the same guidelines as the previous drainage report were used to determine curve numbers and were not modified. Sebastian Stormwater Master Plan Update Page 12 NEEL-SCHAFFER 5ofutfons you can build upon December 6, 2013 W-NEEl;SCiiAFFE R M Sebastian Stormwater Master Plan Update Page 13 —AP-2 r nst-xy aa. in'4i'fd si*. * f K v10.A4,3 �` A ti�^..r" -I.`' f � ' -- � fff - '"'` 444_ �x ��„ri �•, �. 'Ft4 Gat � _ .,. Aa.6 ' ` •AA .E' '� - ��.. CLEAR o¢62-1 - -y q1 - X - a .-yy.�, Tl � � y•. 'a �, � 'ham 'akr w Y Mt_5- � "�' � `� r•�-•�• ti +.�._..-zJ..-_.. � lam. NEEL—SCHAFFER December 6, 2013 5ofutfons you can build upon e) Hydraulic Boundary Conditions in the South Prong of the Sebastian River To determine the boundary conditions to be used in the modeling effort, the conditions specified in the CDM 2004 report were utilized. There are four nodes in the model that represent various locations in the South Prong. The modeled system outfalls to these nodes: ■ N -Stone — this is the boundary condition for the south end of the Stonecrop portion (i.e., the southwest corner of the City that discharges to the South Prong) of the model. This location is consistent with River Station 270 in the FIS. ■ Bridge — this is the boundary condition for the southern outlet from Unit 5. This location is consistent with River Station 235 in the FIS. ■ BC -210 — this is the boundary condition for the southern outlet from Unit 5. This location is consistent with River Station 235 in the FIS. ■ BC -210 — this is the boundary condition for the northern outlet from Unit 5. This location is consistent with River Station 210 in the FIS. ■ Ncollier — this is the boundary condition for Collier Canal. This location is consistent with River Station 195 in the FIS. f) Soils Data Soil data are used to evaluate stormwater runoff, infiltration, and recharge potential for pervious areas. Information on soil types was obtained from the U.E. Department of Agriculture (USDA) NRCS (formerly the Soils Conservation service (SCS) Soil Survey of Indian River County, Florida (NRCS, 1990) and in digital format from the SJRWMD. V. Hydraulic Parameters a) Existing Structure Inventory Existing structures were collected from the CDM 2004 study. Revisions were made to certain structures based on the new 2' topographic data and information obtained from Google Earth Street View for cross -drain sections. The Google Street View NSI identified crossings that were not part of the original model and have been updated in the ICPR model. b) New Drainage Inventory since 2004 As previously mentioned, meetings were held with the City of Sebastian to establish the recent projects since the development of the previous model. These projects are the following: • Twin Ditches Project • City Storm Water Park • Collier Canal Dredging and seawall • Davis Street Drainage and Baffle Box • George Street Drainage • Potomac Street Drainage and Baffle Box • New Quarter Round Installation • Replacement of Damaged Drainage Pipes • Maintenance of existing ditches and swales Sebastian Stormwater Master Plan Update Page 15 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 c) Modification of Existing ICPR Model The previous Stormwater Master Plan study by CDM which was developed in 1996 and then updated in 2004 needed to be updated again due to storm water improvement within the last nine years. The existing stormwater model originally developed as part of the 1996 Study and later updated by CDM in February 2004 as a stormwater master plan study. Since that time, there appeared to be inconsistency in the drainage master plan in relation to the existing drainage system. Based on the previous model analysis which included the original ICPR Model runs, the study performed a limited verification of topographic data and channel cross- sectional information. The previous master plan study noted the limited verification of topographic data. As part of this updated study, there was verification of drainage data which included comparison of the top widths of the modeled cross-sections to the top widths measured on the aerial photograph. There was reasonable validation of the cross-sections by using this method. A review of the UDS quad map indicated that the vast majority of the study area was at elevation 20 foot-NGVD. The inverts of the channels were then adjusted based on the assumption that the top of bank (TOB) of the channels were also at 20 foot-NGVD. The cross-sectional information was reviewed for each channel segment and the depth determined. The invert was determined for each segment as the difference between the adjusted TOB and the depth of the cross section. There was limited survey information available for channels, typically associated with construction plans. This data was used to verify the adjusted TOBs which appeared to be reasonable. The original model developed by CDM was reviewed and then compared with the new model run analysis using new topographic data. New FEMA topographic data was used to determine new basins, time of concentration and re-routing of basins to certain nodes. The stage/storage areas of the nodes and the sub -basin determination which includes basin area and time of concentration values are shown in the technical binders. Sebastian Stormwater Master Plan Update Page 16 NEEL—SCHAFFER 5ofutfons you can build upon 3. Engineering Analysis December 6, 2013 L Stormwater Model Analysis The original citywide stormwater model developed by the previous consultant CDM performed simulation analysis for the mean annual 25 year and 100 year/24 hour design storm event for both the existing and future land use conditions. The modeling analysis for the new update reviewed both previous simulation analyses. New model simulations were also conducted representing changes in the hydraulic conditions based on new stormwater improvements. The hydraulics analysis for both the existing and future land use conditions was analyzed with new ICPR model simulation data. The new model runs were used to identify locations of any hydraulic segments that appeared to be deficient base on top of road elevations and finished floor elevations. The new model analyses were compared to previous model runs for any discrepancies. It should be noted that the previous model findings assumed topographic data for open channels and drainage systems which were not verified in the field. Based on this assumption of non -verified drainage data, the new model simulation runs were field verified for flood conditions, ponding, channels and drainage capacity overflow conditions. Flooding is typically caused by undersized drainage systems or over capacity conveyance of the system due to heavy storm period events. It was field verified that the majority of the deficient storm water areas identified by the model analysis were typically lack of conveyance for storm water runoff. In many of the field locations with drainage flooding, improvements to the drainage system where flooding occurred would resolve the situation. Alternatives were then developed to alleviate any deficiencies. In addition to identifying the deficient drainage areas within the City, the City's stormwater system needed to be updated base on recent drainage improvement by the City and new topographic data provided by FEMA on the flood plan mapping. The modeling analysis was based on the data calculated from the new FEMA GIS database and then re -analyzed using the ICPR3 stormwater model to update the topographic data file and hydrologic unit maps. The existing citywide group model was compressed into three sections to identify and analyze the system as it should be modeled. The City has a natural center line that separates the City into two main drainage groups. These two main Stormwater groups are drainage north of CR 512 and drainage south of CR 512 The model updated and reanalyzed the previous subgroupings of drainage areas establishing two major groups to better analyze and quantify the deficiencies. The City is is split with County Road (CR) 512 as the dividing line for the north and south City's drainage Sebastian Stormwater Master Plan Update Page 17 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 system. In addition to these two drainage groups, the City has a third area east of the existing railroad tracks. This eastern section of the City of Sebastian is not included in the two groups and was never modeled in previous drainage studies. The area of this third group is defined by the railroad tracks to the west and the Indian River Lagoon to the east. This section of Sebastian is known as the "River Front" and part of the City's Redevelopment District. ii. Levels of Service As part of the stormwater management update there is a need to address the level of service. There are essential components to any stormwater master plan and they are the proper levels of service decisions. The City is challenged financially to maintain the drainage system and to provide for the proper level of service needed to maintain the existing drainage systems which include: detention ponds, channels, side ditches, swales and the City's storm water park. During the field review, there are several locations where the open channel system or side ditches were overgrown with vegetation. In the drainage modeling analysis, these open channels or ditches were assigned a coefficient of resistance for flow. This factor is called a "Manning's Coefficient W which represents the roughness coefficient of an excavated channel with minor vegetation. The City ditches and open channels are all filled with weeds and thick brush and vegetation which should have a friction factor worse than the channel with no vegetation. Keeping the citizens of the City safe from flooding is the primary focus of the study. In addition the City needs to maintain emergency and evacuation route access. Level of Service requirements include retrofits to address known flooding problems. The decisions made directly affect the size and cost of any recommended alternative and have been formulated to establish improvement goals. The City does not have a defined level of service for stormwater management in the City's Comprehensive Plan. Since this does not exist, the following criteria were used to define flooding when analyzing the results of the stormwater model: Top of road elevations were exceeded for the 25-year/24-hour storm event; or Top of channel bank elevations were exceeded for the 25-year/24-hour storm event Sebastian Stormwater Master Plan Update Page 18 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 iii. Drainage Deficiencies As part of the stormwater master plan update, the model runs identified some of the similar drainage concerns from the previous study. The regrouping of the systems into two regional groups helped to clarify where actual drainage deficiencies exist or if the model is estimating potential drainage overflow due to detailed topographic data of the City's drainage system. Most of the previous drainage deficiencies have been addressed in the past few years with minor and major drainage improvement projects within the City. These improvements sufficiently address most of the drainage issues identified by the model. Based on local knowledge of the existing City system, there are at present a few areas of drainage deficiencies that the model has identified as potential overflow during high peak storm periods. These deficient drainage areas are shown below in photographs below and identified in the 2013 Drainage Map page 20). The City has identified these drainage improvements in the five to ten year capital improvement program. The goal of the City is to prioritize and apply for storm water grants to help leverage the cost for the various improvement projects. The following projects are illustrated on the 2013 Drainage Map (page 20). Capital Stormwater Projects — Presented to City Council in February 2013 Stormwater Proiects Construction Cost • A - Indian River Drainage Improvement $2,000,000 • B - Collier Canal Hardy Dam $ 100,000 • C - Potomac Ave Lateral Pipe $ 200,000 • D — Blossom/Wentworth Ditch Piping $1,000,000 • E - Stonecrop Pipe/culverts (Bevan & Laconia) $1,000,000 • I — Future South Area Basin $ 300,000 • J — Southeast Dredge Basin $ 500,000 • K — Tulip Pipe Replacement (culvert 42"x72") $ 100,000 • L — East/West Lateral Drainage Pipe $ 500,000 • M — Tulip Detention Basin $ 250,000 • N — George St. Canal Dredging $2,500,000 • O — Rosebush Terrace Pipe — Twin 48" $ 100,000 • P — Landdowne Dr. Pipe — Twin 36" $ 100,000 Total Stormwater Improvements $8,650,000 FI it MI RRIWF11 -FT,flilT F — Replace CMP — Maintenance $ 200,000 G — Quarter Rounds Installation $ 250,000 H — Backyard Ditches Maintenance $1,000,000 Total $1,450,000 Sebastian Stormwater Master Plan Update Page 19 NEEL-SCHAFFER 5n1u0ons yvu r n 6u1lu upon 61TCH D+M1� MNd I �J C I a ETON€CROP E �- ■1 YILLI9N r x _y M MRIAN R,NER oR �'" srvrw '•,��.,� LIIWYA� IMPROVEMENT � A•i2 MILLION N. 512 / 1 ; 1,769 ACRES — R-iEA9�ALL s1.6 r�L.N>N `I1 1 �r 1 iiNwcEPI--p�. _-� $. CR 512 P �,_3'4 583 ACRES -J NAINAQE �� I. — , `' 5 o-rlmN�a-- _� ioaa � � III I I N -f7 MILLN]N �n MM�� � -. _SIN .y STORM l f M-S250K l WATER y,. PA E IIUWApE PIPM December 6, 2013 EK DPAKWElf UM PIPld4FFi! Y WROY9AQR (f]f 1 7 RRi..PA6l o�aNnoN .. MA.,AAEIYNIRVCY�R /�, ANNUAL MAINTENANCE F-� � Vcw O GUAATER ROIIXa'6 #WN H-IMXYAIm DRCHE33, MN11014 1 i IFUTURE PE BASIJFRLE I" c IN F-1 F1 2013 - STORMWATER MASTER (PLAN SE■ems IOL NEEI—SCHAFFER DRAINAGE MAP SEBASTIAN, FLORIDA HOME OF PELICAN ISLAND Sebastian Stormwater Master Plan Update Page 20 NEEL—SCHAFFER 5ofutfons you can build upon iv. Best Management Practices A. Potential BMPs December 6, 2013 This section presents various best management practices (BMPs) that may be considered for use in the City for retrofit treatment. There are many other BMPs used throughout the Country. According to the Environment Protection Agency, "...dilution is the solution to pollution. If people got rid of it quickly enough and far enough away, it would no longer be a problem. In cities and towns, we focused on sewers to ferry and treat human or commercial waste. They used storm sewers for rainwater and snow. In all cases, they have designed convenient ways to ferry water into the nearest water body. Unfortunately, we have discovered that dilution is not the solution for stormwater and its pollutants." Best Management Practices (BMPs) is a term used to describe a type of water pollution control. Stormwater BMPs are techniques, measures or structural controls used to manage the quantity and improve the quality of stormwater runoff. The goal is to reduce or eliminate the contaminants collected by stormwater as it moves into streams and rivers. Once pollutants are present in a water body altering its physical makeup and habitat, it is much more difficult and expensive to restore it. Therefore, the use of BMPs that prevent damage to receiving waters is our target. Stormwater pollution has two main components: • The increased volume and rate of runoff from water resistant surfaces, such as roads and parking lots, and • The amount of pollutants in the runoff. Both components are directly related to urban development. They can cause changes in water quality. This results in a variety of problems: • Environment modification and loss, • Increased flooding, • Decreased native wildlife, and • Increased sedimentation and erosion. In turn, effective management of stormwater runoff offers a multitude of benefits: • Protection of wetlands and ecosystems, • Improved water quality of streams, rivers and other water bodies, • Protection of water resources, • Protection of public health, and • Flood control. There are two groups of BMPs: structural (constructed facilities) and non-structural (regulatory or ordinances). The BMPs discussed appear to be the most applicable to the City. 1. Structural Stormwater Controls • Dry detention ponds • Wet detention ponds • Exfiltration trenches • Shallow grassed swales • Water quality inlets and baffle boxes • Removal of septic tank systems Sebastian Stormwater Master Plan Update Page 21 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon 2. Non -Structural Source Controls • Public information programs • Fertilizer application controls • Pesticide and herbicide use controls • Operation and maintenance December 6, 2013 An explanation of each of the above BMPs follows and is a comparison for the treatment and management of stormwater runoff. The use of a specific BMP depends on the site conditions and objectives such as water quality protection, flood control, aquifer recharge, or volume control. There might be many goals or needs for a project. BMPs can be used with other BMPs to develop a "treatment train." The Stormwater Treatment Train (STT) represents an ecological approach to stormwater management and has proven effective and versatile in its various applications. The STT was designed with sequential components that contribute to the treatment of stormwater before it leaves the site. The components of the Stormwater Treatment Train system were designed to treat stormwater runoff for water quality benefits and to reduce stormwater runoff peaks and volumes. Based on hydrologic modeling and published information on BMP effectiveness, the STT approach can be expected to reduce surface runoff volumes by 65 percent and reduce solids, nutrients, and heavy metals loads by 85 percent to 100 percent. Source controls (upstream from the initial swale component) minimize the impacts of the development even further. This alternative approach to stormwater management not only has the potential to reduce infrastructure costs, but it also reduces maintenance costs. As described above, native plants are adapted to the environment, and do not need extensive watering, chemical treatment, mowing, and replanting that non-native species demand. In addition, there is also a substantial benefit to downstream neighbors. By treating stormwater where it falls on the land, responsible landowners are reducing their contribution to downstream flooding and sedimentation. The STT incorporates a number of BMPs with varying effectiveness for removing particulates and pollutants while also reducing runoff volume. The advantages of an STT are as follows: • Provides effective stormwater flood control by slowing down runoff and storing water, including water infiltration into the soil. • Improves water quality by filtering pollutants from stormwater (oils, greases, metals, and sediments that can be picked up from paved surfaces). • Reduces erosion. • Flexible to incorporate existing natural features and/or introduced stormwater control features. • Provides open space that can be used for recreation and aesthetic value. • Preserves natural/native vegetation and provides habitat for wildlife. • Protects adjacent properties. • Improves property values. There are two disadvantages: • May require more space than is available. • Requires planning and stakeholder acceptance. Sebastian Stormwater Master Plan Update Page 22 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 There are implementation considerations and they are: • Public outreach and acceptance for existing developments or communities. • Effect on long-term stormwater management infrastructure. • Demonstration of improved property values and cost of development with implementation of the Stormwater Treatment Train. • Planning and engineering of effective treatment train appropriate for each area. • Determine the necessary space and length to achieve stormwater management goals and water quality. The cost of an STT will vary depending on best management practices and extent of the treatment system. Overall cost is less, however, than stormwater collection and conveyance systems for a similar area. B. Structural BMPs Structural BMPs involve building an engineered "facility" for controlling quantity and quality of urban runoff. These structures treat runoff at either the point of generation or the point of discharge to either the storm sewer system or receiving waters. Most require some level of routine maintenance. Structural BMPs can be categorized as retention systems, detention systems or other systems (Marshall, 2002). Although the basic principles of management stormwater remain the same, they should be uniquely adapted to the special requirements of each project. It should be understood that no one BMP can be the "cure all" for a particular project, but if several are used together in a linked fashion like cars in a train (a "BMP treatment train), adverse effects of urban stormwater runoff can be reduced or alleviated (Marshall, 2002). A careful assessment of stormwater management conditions should be made before choosing a system of comprehensive BMPs. First, potential pollutant sources and high risk areas of pollution must be identified. Then, the magnitude of the problem must be evaluated by monitoring and analyzing runoff to determine the amount and type of pollutants in terms of concentration or load. Understanding the source, amount, and characteristics of pollutants in stormwater runoff is essential in applying a screening process for selecting appropriate BMPs (Marshall, 2002). General Information for Detention Practices Detention refers to the temporary storage of excess runoff onsite prior to gradual release after the peak of the storm inflow has passed. Runoff is held for a period of time and is slowly released to a natural or manmade water course, usually at a rate no greater than the pre -development peak discharge rate. For water quantity, detention facilities will not reduce the total volume of runoff, but will redistribute the rate of runoff over a longer period of time by providing temporary storage for the stormwater. Storage of stormwater runoff within a stormwater management system is essential to providing the extended detention of flows for water quality treatment and downstream channel protection, as well as for peak flow attenuation (the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent) of larger flows for overbank and extreme flood protection. Dry Detention Ponds Dry detention ponds (a.k.a. dry ponds, extended detention basins, detention ponds, and extended detention ponds) are basins whose outlets have been designed to detain Sebastian Stormwater Master Plan Update Page 23 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 stormwater runoff for some minimum time (e.g., 24 hours) to allow particles and associated pollutants to settle. Unlike wet ponds, these facilities do not have a large permanent pool of water. However, they are often designed with small pools at the inlet and outlet of the basin. They can also be used to provide flood control by including additional flood detention storage. Dry detention ponds have traditionally been one of the most widely used stormwater best management practices. In some instances, these ponds may be the most appropriate best management practice. However, they should not be used as a one size fits all solution. If pollutant removal efficiency is an important consideration then dry detention ponds may not be the most appropriate choice. Dry detention ponds require large amounts of space to build them. Potential Benefits of a Dry Detention Pond • Reduction of downstream flooding problems by attenuating the peak rate of flow. • Some removal of pollutant loadings to receiving bodies of water for suspended pollutants. • Reduction in cost for downstream conveyance facilities. • Creation of fill that may be used on site for sold (pond sediment removal). • Low frequency of failure as compared with filtration systems. Limitations Although dry detention ponds are widely applicable, they have some limitations that might make other stormwater management options preferable: • Dry detention ponds have only moderate pollutant removal when compared to other structural stormwater practices, and they are ineffective at removing soluble pollutants (See Effectiveness). • Dry extended detention ponds may become a nuisance due to mosquito breeding if improperly maintained or if shallow pools of water form for more than 7 days. • Although wet ponds can increase property values, dry ponds can actually detract from the value of a home (see Cost Considerations). Dry detention ponds on their own only provide peak flow reduction and do little to control overall runoff volume, which could result in adverse downstream impacts Extended Dry Detention Extended detention refers to a basin designed to extend detention beyond that required for stormwater peak rate control to provide some water quality affect. Extended dry detention (ED) is used to drain a runoff volume over a specified period of time, typically 24 hours, and is used to meet channel protection criteria (CPv). Some structural control designs (wet ED pond and micro -pool ED pond) also include extended detention storage of a portion of the water quality volume. Extended detention basins are viable and effective treatment facilities. When properly designed, significant reductions are possible in the total suspended sediment load and of constituents associated with these sediments. Typically these basins are less effective in removing soluble solids. The amount of reduction depends on a wide variety of factors, including: • Surface area of the basin, • Peak outflow rate, • Size distribution of the particles, Sebastian Stormwater Master Plan Update Page 24 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 • Specific gravity of particles, • Fraction of the sediment that is active clay, • Type of associated pollutant concentrations, • Fraction of influent solids are colloidal, dissolved, and non -settleable. Extended detention basins will sometimes have a small permanent pool below the invert of the low flow outlet. This is normally so small that it does not materially impact trapping of sediment and chemicals, and is typically included for aesthetics or to cover deposited sediments. Wet Detention Ponds Wet detention systems (a.k.a. stormwater ponds, wet retention ponds, retention basins, wet extended detention ponds) are the most recognizable stormwater systems. They are constructed basins that have a permanent pool of water into which stormwater runoff is directed. Runoff from each rain event is detained and treated in the pond until it is displaced by runoff from the next storm. They are designed to remove pollutants from stormwater. Ponds treat incoming stormwater runoff by allowing particles to settle and algae to take up nutrients. The primary removal mechanism is settling as stormwater runoff resides in this pool. The pond's natural physical, biological, and chemical processes then work to remove the pollutants. Sedimentation processes remove particulates, organic matter, and metals, while dissolved metals and nutrients are removed through biological uptake. In general a higher level of nutrient removal and better stormwater quantity control can be achieved in wet detention ponds than can be achieved with other BMPs, such as dry ponds, infiltration trenches, or sand filters. Wet detention ponds can be used as a stormwater retrofit. A stormwater retrofit is a stormwater management practice (usually structural) put into place after development has occurred, to improve water quality, protect downstream channels, reduce flooding, or meet other specific objectives. Wet ponds are very useful stormwater retrofits and have two primary applications as a retrofit design. In many communities, detention ponds have been designed for flood control in the past. It is possible to modify these facilities to develop a permanent wet pool to provide water quality control, and modify the outlet structure to provide channel protection. Sebastian Stormwater Master Plan Update Page 25 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon Example of Stormwater Park in Sebastian, Florida December 6, 2013 Design Considerations of Wet Detention Ponds Specific designs may vary considerably, depending on site constraints or preferences of the designer or community. There are some features, however, that should be incorporated into most wet pond designs. These design features can be divided into five basic categories: pretreatment, treatment, conveyance, maintenance reduction, and landscaping. Pretreatment incorporates design features that help to settle out coarse sediment particles. By removing these particles from runoff before they reach the large permanent pool, the maintenance burden of the pond is reduced. In ponds, pretreatment is achieved with a sediment forebay. A sediment forebay is a small pool (typically about 10 percent of the volume of the permanent pool). Coarse particles remain trapped in the forebay, and maintenance is performed on this smaller pool, eliminating the need to dredge the entire pond. Treatment design features help enhance ability of a stormwater management practice to remove pollutants. The purpose of most of these features is to increase the amount of time that stormwater remains in the pond. Stormwater should be conveyed to and from all stormwater management practices safely and to minimize erosion potential. The out fall of pond systems should always be stabilized to prevent scour. In addition, an emergency spillway should be provided to safely convey large flood events. To help mitigate warming at the outlet channel, designers should provide shade around the channel at the pond outlet. In addition to regular maintenance activities needed to maintain the function of stormwater practices, some design features can be incorporated to ease the maintenance burden of each practice. In wet ponds, maintenance reduction features include techniques to reduce the amount of maintenance needed, as well as techniques to make regular maintenance activities easier. The potential maintenance concern in wet ponds is clogging of the outlet. Ponds should be designed with a non -clogging outlet such as a reverse -slope pipe, or a weir outlet with a trash rack. A reverse -slope pipe draws from below the permanent pool extending in a reverse angle up to the riser and established the water elevation of the permanent pool. Because these outlets draw water from below the level of the permanent pool, they are less likely to be clogged by floating debris. Landscaping of wet ponds can make them an asset to a community and can also enhance the pollutant removal of the practice. A vegetated buffer should be preserved around the pond to protect the banks from erosion and provide some pollutant removal before runoff enters the pond by overflow. In addition, ponds Sebastian Stormwater Master Plan Update Page 26 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 should incorporate an aquatic bench (i.e., a shallow shelf with wetland plants) around the edge of the pond. This feature may provide some pollutant uptake, and it also helps to stabilize the soil at the edge of the pond and enhance habitat and aesthetic value Wet Extended Detention Pond The wet extended detention pond combines the treatment concepts of the dry extended detention pond and the wet pond. In this design, the water quality volume is split between the permanent pool and detention storage provided above the permanent pool. During storm events, water is detained above the permanent pool and released over 12 to 48 hours. This design has similar pollutant removal to a traditional wet pond and consumes less space. Wet extended detention ponds should be designed to maintain at least half the treatment volume of the permanent pool. In addition, designers need to carefully select vegetation can withstand both wet and dry. Wet Extended Detention Pond The wet extended detention pond combines the treatment concepts of the dry extended detention pond and the wet pond. In this design, the water quality volume is split between the permanent pool and detention storage provided above the permanent pool. During storm events, water is detained above the permanent pool and released over 12 to 48 hours. This design has similar pollutant removal to a traditional wet pond and consumes less space. Wet extended detention ponds should be designed to maintain at least half the treatment volume of the permanent pool. In addition, designers need to carefully select vegetation can withstand both wet and dry. Water Reuse Pond Wet reuse ponds can act as a water source for irrigation. In this case, the water balance should account for the water that will be taken from the pond. One study conducted in Florida estimated that a water reuse pond could provide irrigation for a 100 -acres golf course at about One-seventhe the cost of the market rate of the equivalent amount of water at $40,000 versus $300,000. Effectiveness of Wet Detention Ponds Structural stormwater management practices can be used to achieve four broad resource protection goals. These include flood control, channel protection, ground water recharge, and pollutant removal. Wet ponds can provide flood control, channel protection, and pollutant removal. One objective of stormwater management practices can be to reduce the flood hazard associated with large storm events by reducing the peak flow associated with these storms. Wet ponds can easily be designed for flood control by providing flood storage above the level of the permanent pool. When used for channel protection, wet ponds have traditionally controlled the 2 -year storm. It appears that this control has been relatively ineffective and research suggests that control of a smaller storm may be more appropriate. Wet ponds, cannot provide ground water recharge. Infiltration is impeded by the accumulation of debris on the bottom of the pond. Wet ponds are among the most effective stormwater management practices at removing Sebastian Stormwater Master Plan Update Page 27 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 stormwater pollutants. A wide range of research is available to estimate the effectiveness of wet ponds. Limitations of Wet Detention Ponds Limitations to wet detention ponds include: • If improperly located, wet pond construction may cause loss of wetlands or forest. • Wet ponds are often inappropriate in dense urban areas because each pond is generally quite large. • Wet detention ponds must be able to maintain a permanent pool of water. Therefore, ponds cannot be constructed in areas where there is insufficient precipitation to maintain the pool or in soils that are highly permeable. • In cold water streams, wet ponds are not a feasible option due to the potential for stream warming. • Wet ponds may pose safety hazards. • Without proper maintenance, the performance of the pond will drop off sharply. Regular cleaning of the fore bays is particularly important. Maintaining the permanent pool is also important in preventing the re -suspension of trapped sediments. The accumulation of sediments in the pond will reduce the pond's storage capacity and cause a decline in its performance. Therefore, the bottom sediments in the permanent pool should be removed about every 2 to 5 years. Exfiltration Trenches An exfiltration trench is an underground drainage system consisting of a perforated pipe surrounded by natural or artificial aggregate such as sand, which stores and infiltrates runoff. They are similar to infiltration trenches with the exception they can be placed below paved surfaces such as parking lots and streets. The exfiltration trench performs well at removal of fine sediment and pollutants. They are sometimes referred to as subsurface detention or retention, percolation tanks, soak -always or underground infiltration basins. While infiltration trenches are usually rock filled ditches into which stormwater enters from the top, exfiltration trenches often involve a pipe in the middle of the trench through which stormwater enters. The stormwater runoff is collected by catch basins located at the end of each exfiltration trench segment; the perforated pipe delivers the stormwater into the surrounding aggregate through the pipe perforations. The stormwater ultimately exfiltration into the ground water aquifer through the trench walls and bottom. As the treatment volume is not discharged into surface waters, exfiltration trench systems are considered a type of retention treatment. The objectives of these structures are to capture and discharge stormwater at a controlled rate. They function in concert with pervious surfaces by enhancing the infiltration and storage capacity of on-site soils and treating runoff before it recharges the ground water. Exfiltration systems act as small, distributed, underground stormwater retention ponds. Exfiltration tanks and trenches can be used to convey and distribute captured runoff across a lot or subdivision. These exfiltration structures provide a storage area for rapid runoff during a storm, then allow it to infiltrate gradually through the soil into the ground water. Runoff water enters the underground chamber at the inlet and a physical filtration process removes pollutants as some pollutants can remain in the exfiltration water, so additional source control is needed where ground water contamination is a concern. Sebastian Stormwater Master Plan Update Page 28 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon Example of an Exfiltration Trench December 6, 2013 The permeability of the soils at the exfiltration trench location and the anticipated water table elevation � errrc.wc � rf. p rR'si�e"m.rw determine the applicability and -- performance of the exfiltration trench system, which has to be able to as infiltrate the required stormwater treatment volume and drawdown the treatment volume to return to its normal condition within a specific time after the design storm event. When the trench Bottom is located at or above the average wet season water table, the exfiltration trench is considered a dry system. Exfiltration trenches, like other types of retention systems, are able to efficiently remove the storm water pollutants. Additionally, exfiltration trenches contribute to recharge of the ground water aquifer thus assist in combating saltwater intrusion in coastal areas. Exfiltration tanks and trenches can vary considerably in size. Large underground exfiltration designs generally utilize concrete and large pipe systems. Modular products are available that are usually constructed of lightweight but durable plastic wrapped in a geo- textile. Water Quality The exfiltration trenches to provide water quality treatment to a watershed can be installed off-line or online in the drainage system. The off-line treatment method diverts runoff into the exfiltration trench designed provide the required treatment volume; subsequent runoff in excess of the treatment capacity bypass the off-line exfiltration trench towards the outfall. A diversion drainage structure is usually required for off -lien systems. The on-line exfiltration trench provides the required water treatment but the treatment volume is mixed with the total runoff volume. As such, runoff volume in excess of the treatment capacity carries a portion of the pollutant load to the receiving water body. Water Protection Benefits Water conservation implications — Exfiltration systems do not benefit potable water supplies directly, but do assist in groundwater recharge and reducing some demand by on site vegetation. • Stormwater implications — Sub -surface infiltration systems such as exfiltration tanks reduce peak veloCity and volume of stormwater runoff. When significant storage volumes and mitigation of peak runoff veloCity are attained, zero stormwater discharge from the lot may be achieved. This in turn can reduce the size of the centralized stormwater retention ponds. Operations and Maintenance (O and M) Successful operation depends on maintaining the percolation rate of the trench's sides and bottom. The keys to long-term performance are accurate estimation of percolation rate, proper construction, pretreatment, offline design, and maintenance accessibility. Exfiltration trenches can become clogged, so it is important to prevent sediments and materials from entering the system as much as possible and periodically remove those that accumulate. Frequency of clogging is dependent on effectiveness of pretreatment, such as vegetative Sebastian Stormwater Master Plan Update Page 29 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 buffer strips and street sweeping, at removing sediments. Accumulated sediments need to be removed from the pipe to allow percolation into filter media. If filter media becomes clogged, it can be expensive to remove pipe and replace media to allow for proper percolation. Access for maintenance should be considered in the design, potentially including an observation well of PVC pipe leading to the bottom of the trench to allow for monitoring of the drawdown rate. Some systems incorporate an underdrain below the filtering system, which can be used as an overflow should clogging occur. Applications of Exfiltration Trenches • Residential lots • Commercial development • Parking lots • Green spaces • Golf courses Benefits of Exfiltration Trenches • They mimic the natural groundwater recharge capabilities of the site. • Are relatively easy to fit into the margins, perimeters, and other space - constrained areas of a development site, including underground pavement. • Can provide offline treatment for environmentally sensitive waters (e.g., Class I, Class II, or OFW). • Can be used to retrofit already developed sites where space is limited. • Detention • Infiltration • Stormwater reuse • Groundwater recharge • Runoff attenuation • Reduction in peak veloCity • Reduction in stormwater runoff volume • Possible reduction in size of central stormwater retention ponds Potential Limitations of an Exfiltration Trench • Require highly permeable soils to function properly. • Difficulties in keeping sediment out of the structure during site construction. • Not recommended for clayey or highly erodible soils. • Have relative short life spans before replacement or extensive restoration/maintenance of system is required. • Often more costly than other treatment alternatives, especially when operation and maintenance costs are considered. Shallow Grassed Swales In the context of BMPs to improve water quality, the term swale (a.k.a. grassed channel, dry swale, wet swale, bio filter, or bios wale) refers to a vegetated, open channel management practices designed specifically to treat and attenuate stormwater runoff for a specified water quality volume. As stormwater runoff flows along these channels, it is treated through vegetation slowing the water to allow sedimentation, filtering through a subsoil matrix, and/or infiltration into the underlying soils. Variations of the grassed swale include the Sebastian Stormwater Master Plan Update Page 30 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 grassed channel, dry swale, and wet swale. The specific design features and methods of treatment differ in each of these designs, but all are improvements on the traditional drainage ditch. These designs incorporate modified geometry and other features for use of the swale to treat and convey stormwater runoff. Grassed swales can be applied in most situations with some restrictions. Swales are well suited for treating highway or residential road runoff because they are linear practices. They can also be used to provide a low-cost drainage option for farms, industrial, and commercial areas. Swales are also useful as one of a series of stormwater BMPs or as part of a treatment train, for instance, conveying water to a detention pond and receiving water from filter strips. Furthermore, swales are highly recommended by proponents of design approaches such as Low Impact Development (LID) and other green designs. Grassed swales can be used as a retrofit. A stormwater retrofit is a stormwater management practice (usually structural) put into place after development has occurred to improve water quality, protect downstream channels, reduce flooding, or meet other specific objectives such as reducing loadings to comply with a TMDL waste load allocation. One retrofit opportunity using grassed swales modifies existing drainage ditches. Ditches have traditionally been designed only to convey stormwater. In some cases, it may be possible to incorporate features to enhance pollutant removal or infiltration such as check dames (i.e., small dams along the ditch that trap sediment, slow runoff, and reduce the effective longitudinal slope). Since grassed swales cannot treat a large area, using this practice to retrofit entire water shed would be expensive because of the number of practices needed to manage runoff from a significant amount of the watershed's land area. Designers need to consider site conditions. In addition, they need to incorporate design features to improve the longevity and performance of the practice while minimizing the maintenance burden. Drainage Area Grassed swales should generally treat runoff from small drainage areas (less than 5 acres). If used to treat larger areas, the flows through the swale become too large to produce designs to treat stormwater runoff in addition to conveyance. Slope Grassed swales should be used on sites with relatively flat slopes of less than 4 percent slope; 1 to 2 percent slope is recommended. When site conditions require installing the swales in areas with larger slopes, check dams can be used to reduce the influence of the slope. Runoff velocities within the channel become too high on steeper slopes. This can cause erosion and does not allow for infiltration or filtering in the swale. Grassed swales can be used on most soils, with some restrictions on the most impermeable soils. In the dry swale a fabricated soil bed replaces on-site soils in order to ensure that runoff is filtered as it travels through the soils of the swale. The required depth to ground water depends on the type of swale used. In the dry swale and grassed channel options, the bottom of the swale should be constructed at least 2 feet above the ground water table to prevent a moist swale bottom or contamination of the ground water. In the wet swale option, treatment is provided by creating a standing or slow flowing wet pool, which is maintained by intersecting the ground water. According to SJRWMD, a swale is defined as a manmade trench that: • Has a top width -to -depth ratio of the cross-section equal to or greater than 6:1 or side slopes equal to or greater than 3 feet horizontal to 1 foot vertical. Sebastian Stormwater Master Plan Update Page 31 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 • Should contain contiguous areas of standing or flowing water only following a rainfall event, thus the system is normally "dry." • Is designed to percolate 80 percent of the 3-year/1-hour storm (approximately 2.3 inches in 1 hour) within 72 hours. • Is planted with or has stabilized vegetation suitable for soil stabilization, stormwater treatment, and nutrient uptake. • Is designed to take into account the soil errodability, soil percolation, slope length, and drainage area to prevent erosion and reduce the pollutant concentration of any discharge. Design Considerations Although there are different design variations of the grassed swale, there are some design considerations common to all designs. An overriding similarity is the cross-sectional geometry. Swales often have a trapezoidal or parabolic cross section with relatively flat side slopes (flatter than 3:1), though rectangular and triangular channels can also be used. Designing the channel with flat side slopes increases the wetted perimeter. The wetted perimeter is the length along the edge of the swale cross section where runoff flowing through the swale contacts the vegetated sides and bottom. Increasing the wetted perimeter slows runoff velocities and provides more contact with vegetation to encourage sorption, filtering, and infiltration. Another advantage to flat side slopes is that runoff entering the grassed swale from the side receives some pretreatment along the side slope. Design Variations to the Grassed Swale There are variations to the Grassed Swale and they include the grassed channel, dry swales, and wet swales. Of the three grassed swale designs, grassed channels are the most similar to a conventional drainage ditch, with the major differences being flatter side slopes and longitudinal slopes, and a slower design veloCity for water quality treatment of small storm events. Of all the options, grassed channels are the least expensive but also provide the least reliable pollutant removal. The grassed channel is a flow -rate -based design. Based on the peak flow from the water quality storm (this varies regionally, but a typical value is the 1-inch/24 hour storm), the channel should be designed so that runoff takes, on average, 10 minutes to flow from the top to the bottom of the channel. Dry Swales Dry swales are similar in design to bio retention areas. These incorporate a fabricated soil bed into their design. The native soil is replaced with sand/soil mix that meets minimum permeability requirements. An underdrain system is installed at the bottom of the soil bed. This underdrain is a gravel layer that encases a perforated pipe. Stormwater treated in the soil bed flows into the under drain, which routes this treated stormwater to the storm drain system or receiving waters. Dry swales are a relatively new design, but studies of swales with a native soil similar to the man-made soil bed of dry swales suggest high pollutant removal. Wet Swales Wet swales intersect the ground water and behave similarly to a linear wetland cell. This incorporates a shallow permanent pool and wetland vegetation to provide stormwater treatment. The wet swale also has potentially high pollutant removal. Wet swales are not commonly used in residential or commercial settings because the shallow standing water may be a potential mosquito breeding area Sebastian Stormwater Master Plan Update Page 32 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Maintenance Considerations of Grass Swales Maintenance of grassed swales mostly involves litter control and maintaining the grass or wetland plant cover. Typical maintenance activities are as follows: • Inspect pea gravel diaphragm for clogging and correct the problem • Inspect grass alongside slopes for erosion and formation of rills or gullies and correct. • Remove trash and debris accumulated in the inflow forebay. • Inspect and correct erosion problems in the sand/soil bed of dry swales. • Based on inspection, plant an alternative grass species if the original grass cover has not been successfully established. • Replant wetland species (for wet swale) if not sufficiently established. • Rototill or cultivate the surface of the sand/soil bed of dry swales if the swale does not draw down within 48 hours. • Remove sediment build-up within the bottom of the swale once it has accumulated to 25 percent of the original design volume. • Mow grass to maintain a height of 3-4 inches. Effectiveness of Grass Swales Structural stormwater management practices can be used to achieve four broad resource protection goals. These include flood control, channel protection, ground water recharge, and pollutant removal. Grassed swales can be used to meet ground water recharge and pollutant removal goals. Grassed channels and dry swales can provide some groundwater (subsurface water contained in the interconnected pores below the water -table of an aquifer) recharge (process by which aquifers are replenished with water from the surface) as infiltration is achieved within the practice. Wet swales, however, generally make little, if any, contributions to ground water recharge. Infiltration is impeded by the accumulation of debris on the bottom of the swale. A number of factors influence the rate of recharge including the soil type, plant cover, slope, rainfall intensity, and the presence and depth of confining layers and aquifers. Most of Florida's groundwater recharge occurs in the summer months when precipitation is highest. Recharge also occurs with locally heavy rainstorms during the rest of the year. Groundwater typically discharges into a lake or river, maintaining its level or flow in dry seasons. Benefits of Shallow Grassed Swales • Usually less expensive than installing curb and gutters, and usually less expensive than other water quality treatment controls. • Hardly noticeable if shallow swales (0.5 to 1.0 ft. maximum depth) are designed and constructed with gradual slopes (4:1 to 6:1). • Can provide off-line treatment for environmentally sensitive waters (e.g. Class I, Class II, or OFW). • Can reduce peak rates of discharge by storing, detaining, or attenuating flows. • Can reduce the volume of runoff discharged from a site by infiltrating runoff with a raised inlet or check dam. • Maintenance can be performed by the adjacent landowner. • Can be used in space -constrained areas such as along lot lines, rear of lots, and along roadside. • Can be used as water quality treatment or pretreatment with other BMPs in a treatment train. • Recovers storage and treatment volumes quickly wher4e soils are permeable. Sebastian Stormwater Master Plan Update Page 33 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Can be used as recessed landscape areas (part of green space requirement), and runoff collection becomes the source for irrigation and some nutrients (saving money) provided the use does not impact long-term maintenance or impact existing trees. Limitations of Grass Swales Grassed swales have some limitations, including the following: • Grassed swales cannot treat a very large drainage area. • Wet swales may become a nuisance due to mosquito breeding. • If designed improperly (e.g., if proper slope is not achieved), grassed channels will have very little pollutant removal. • Effective only as a conveyance system in unsuitable soils. • Possible nuisances such as odors, mosquitoes, or nuisance plant species can occur if not designed, constructed or maintained. • Aesthetically unpleasing if improperly designed and constructed (deep with steep side slopes — looks like a ditch). • Improperly designed swales may also negatively impact the frequency of maintenance by the responsible entity. • May not be suitable or may require geotextile matting in areas that serve as vehicle parking areas. Water Quality Inlets and Baffle Boxes Water quality inlets (WQls), also commonly called trapping catch basins, oil/grit separators, consist of one or more chambers that promote sedimentation of course materials and separation of free oil (as opposed to emulsified or dissolved oil) from storm water. The first provides effective removal of coarse particles and helps prevent premature clogging of the filter media. A second chamber contains a sand filter to provide additional removal of finer suspended solids by filtration. Water quality inlets rely on settling to remove pollutants before discharging water to the storm sewer or other collection system. They are also designed to trap floating trash and debris. When inlets are coupled with oil/grit separators and/or hydrocarbon absorbents, hydrocarbon loadings from high traffic/parking areas may be reduced. However, experience has shown that pollutant -removal effectiveness is limited, and the devices should be used only when coupled with extensive clean-out methods (Schuler et al., 1992). Maintenance must include proper disposal of trapped coarse-grained sediments and hydrocarbons. Clean-out and disposal costs may be significant. Catch basins are water quality inlets in their simplest form. They are single chambered inlets with a lowered bottom to provide 2 to 4 feet of additional space between the outlet pipes for collection of sediment at the bottom of the structure. Selection Criteria Applicable too many sites, including high density areas with poorly drained soils and extensive impermeable areas. Small Drainage area. Flexibility to retrofit existing drainage areas with minimal or no additional land requirement. Sebastian Stormwater Master Plan Update Page 34 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon Limitations December 6, 2013 Pollutant removal effectiveness is limited, and the devices should be used only when coupled with extensive clean-out methods. Not effective for water quality control during intensive storms. Design and Sizing Considerations • Retrofitting devices can be installed in any shape or size of grate or cub inlet. Accurate measurement of inlets must be taken to ensure proper fit. • Should not obstruct flow or cause excessive hydraulic head losses. • Need removable grates or manholes to install and clean devices. Inspection/Maintenance Considerations High sediment loads can interfere with the ability of the WQI to effectively separate oil and grease from the runoff. During periods of high flow, sediment can be suspended and released from the WQI into surface waters. Maintenance of WQIs can be easily neglected because they are underground. Establishment of a maintenance schedule is helpful for ensuring proper maintenance occurs. The required maintenance effort will be site-specific due to variations in sediment and hydrocarbon loading. Since WQI residuals contain hydrocarbon by-products, they may require disposal as hazardous waste. Many WQI owners coordinate with waste haulers to collect and dispose of these residuals. Separation Devices Separation devices include sumps, baffle boxes, oil/grit separators, and sediment basins to capture trash, sediments, and floating debris. They are efficient only within specific ranges of volume and discharge rates. Control units usually have a forebay to pretreat discharges by separating heavy grit and floating debris before it enters the separator. Separation processes use gravity, vortex flow, centrifugal force, and even direct filtration. Further treatment may be accomplished by adding chemicals such as alum. After separation, the sediment is collected and transported or pumped to a waste treatment facility. These devices may have a high initial investment cost. Nutrient Baffle Boxes Nutrient baffle boxes are concrete or fiberglass structures containing a series of sediment settling chambers separated by baffles. The primary function of baffle boxes is to remove sediment, suspended particles, and associated pollutants from stormwater. Baffle boxes may also contain trash screens or skimmers to capture larger materials, trash, and floatables. Baffle boxes are located either in-line or at the end of storm pipes. The use of baffle boxes for pollutant removal is based on the concept of slowing the flow veloCity through the box, thereby allowing solids and associated pollutants to settle to the bottom of the box. Stormwater enters the box and begins to fill the first chamber. As water encounters the baffles, flow veloCity decreases, allowing particles with a settling veloCity to settle to the bottom of the box. In addition to decreasing flow velocities, the baffles impede particle movement. As suspended solids strike the baffles, they begin to settle. Larger particles usually settle out first and accumulate in the first chambers while smaller particles usually settle out in subsequent chambers. Sebastian Stormwater Master Plan Update Page 35 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Nutrient baffle boxes have proven effective in removing sediment from stormwater runoff. They are mainly utilized in areas where sediment control is a primary concern, while other stormwater BMPs may be more effective in areas where additional stormwater pollutants, such as dissolved nutrients, oil and grease, or metals, are prevalent Nutrient baffle boxes are ideally suited for retrofitting into existing storm pipes. Baffle boxes for pipes up to 48 inches in diameter can be precast, making installation quick and cost- efficient. Baffle boxes can be used for pipes up to 60 inches in diameter, but these boxes must be cast in place, making them more expensive and time-consuming to install. Baffle boxes are principally designed for sediment removal, but trash racks, screens, or skimmers can be installed to trap floatables and oil and grease as well. Design Criteria The design concept of a sediment (baffle) box is similar to the design of a three -chamber water quality inlet (also known as an oil/grit separator). Typical baffle boxes are 3 to 5 meters (10 to 15 feet) long, 0.6 meters (2 feet) wider than the pipe, and 2 to 2.7 meters (6 to 8 feet) high. Weir height is usually 1 meter (3 feet). Weirs are usually set at the same level as the pipe invert to minimize hydraulic losses. Manholes are set over each chamber to allow easy access for cleaning and maintenance. Manholes should be located access by vacuum trucks for box maintenance. within 15 feet of a paved surface to allow The design of the baffle box can be modified to promote easy cleaning and to prevent nutrient leaching from accumulated biota. Some fiberglass baffle boxes have been designed to include sliding gates on both ends. These gates are closed during cleaning to block flow, allowing removal of accumulated sediments and trash without vacuuming up Sebastian Stormwater Master Plan Update Page 36 NEEL-SCHAFFER S.1.0ons yvu r n build upon December 6, 2013 incoming or residual flows. These baffle boxes also have rounded bottoms that cause accumulated sediment to collect in the middle of the box, making it easier to vacuum it out. Baffle boxes can also be designed with aluminum screens installed below the inflow pipe but above the baffles. In this design, incoming flow drops through the screen, trapping trash, yard waste, and other debris away from the accumulating water below. Leaching is reduced because this debris is kept out of standing water. Therefore, there is less chance of introducing nutrients into the outflow. Trash deflectors are set at the outflow end of the box, reducing the chance of carrying garbage out with excess flow. Preliminary modeling by the Florida Institute of Technology indicates that these screens do not become clogged even under heavy loads of debris (unpublished data reported by Sun tree Technologies, Inc. 2000). CY SE��. Cit o Sebastian Stormwrater Quality Improvement Project NICCL-SEFIAFFER HOME OF PELICAN ISLAMU 6tarm M, flu— a b- ww v gawi— r. calm. -4 - " — .)qm— an9 i� P� _ to tom VIA VALr r tx 9612 t 4RM11{ Wft VW kVmW In [hr bDnt a Mo. bO&. r -A ng Wb g III . lop o' the >» ur caq t—d by — .bs bw .boors. Th. -It I..d..r.,r,...bw W*k* aul. of Eh. b.M. bon m. ti- Ind. n R16— in —� a_„ � l m, As flow accumulates in the first chamber, it is forced over a baffle into the next chamber. Flow deflectors at the top of the baffle reduce the possibility of sediment being carried from one chamber to the next. Flow exits through the outlet pipe. Possible modifications to a standard baffle box design to accommodate site-specific conditions include: A two -chamber box for small pipes and small drainage areas; A three -chamber box for larger pipes; and Two multi-chambered boxes in a series. These design modifications have not been fully studied. However, the Florida Institute of Technology used hydraulic scale -modeling to evaluate box size and shape, along with baffle size and placement, on pollutant removal efficiency. Using three, four, and five - chambered baffle boxes, this study evaluated the sediment removal efficiencies of fine and coarse-grained sediments under several typical flow rates and sediment concentrations. The researchers also evaluated the effect of changing the depth of the box and raising the height of the baffles. The results showed that, in general, adding more chambers to the box did not increase sediment removal because each chamber became shorter, and thus sediment did not settle out as efficiently. Re -suspension of sediments in the box was a consistent problem because incoming flow disturbed sediments that had already settled, causing them to be re -suspended and carried out of the settlement chamber. The study Sebastian Stormwater Master Plan Update Page 37 NEEL—SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 suggested that reducing re -suspension in the box would increase its overall efficiency, but this has not been investigated. Performance Baffle boxes are an effective BMP to remove sediments from stormwater. Baffle boxes have been shown to remove from 225 to 22,500 kilograms (500 to 50,000 pounds) of sediment per month, depending on the sediment load feeding into the baffle box. However, pollutant removal efficiencies (e.g., the percentage of pollutants removed by the BMP) depend on factors such as land use, drainage basin area, soil types, stormwater velocities through the box, and the frequency and thoroughness of box cleaning. Limited data exists on the pollutant removal efficiencies of baffle boxes. Only one laboratory and one field evaluation are complete, while several more field tests are scheduled for the future. Benefits of the Nutrient Separating Baffle Boxes • Fits Within Existing Easements • Retrofits Existing Systems • Easy & Quick To Install and Maintain • Captures Foliage, Litter, Sediment & Hydrocarbons • Separates Foliage and Litter From Water & Sediment • Will Not Go Septic Between Storm Events • Captures thousands of pounds of sediment, debris and gross pollutants • Excellent treatment structure for Recharge wells Stormwater Quality Improvement Project — Nutrient Separating Baffle Box Skimmers Oil and grease simmers are a cost-effective method of prohibiting oil and grease from following onto receiving water bodies. Oil and grease skimmers are easily installed and maintained. Skimmers should also be considered in the design phase of all storage/treatment facilities such as the wet detention ponds. The SJRWMD requires the use of skimmers or baffles at BMP outlets where oil and grease are expected (e.g., gasoline station) and where the upstream tributary has more than 50 percent of impervious surfaces. The skimmers are designed to retain the oils and greases at the surface of the retention/detention system. C. Non -Structural BMPs Non-structural BMPs are practices that improve water quality by reducing the accumulation and generation of potential pollutants at or near their source. They do not require construction of a facility, but instead provide for the development of pollution control programs that include prevention, education and regulation. These can be classified as follows: • Planning and regulatory tools • Conservation, recycling and source controls • Maintenance and operational procedures • Educational and outreach programs The Sebastian City Council recently had an education presentation on the City's erosion control illicit discharge relating to the National Pollutant Discharge Elimination System Sebastian Stormwater Master Plan Update Page 38 NEEL-SCHAFFER Sofutlons you can build upon December 6, 2013 (NPDES) which the City now has an ordinance relating to the City's NPDES and the National Clean Water Act. Other samples of educational campaigns include; posters, brochures and webpages. mer�rte ewPiTe roe>ee4 pi scar enww�nrawwu..romrxra How W / pewb] �r.ea�, .enp.ma xgMwT rt+9obwa�xeernN. _ we.s�wer.'�v+o.',pcv4woNMMb. aerw ne..rona.. www=er.=Wae a. mdma r.r,«d+,m.. rnae r we eae. raR++ww,eer.v Don't put your old electronics in your recycle bin - �, CmeiiB�a o fAFF RebRaM1etl topbp, caxleryd FERC RttyCMgSNUIIPM. ilpW Mkw raNle IickH ona Mngwmm YooNm1M W lehd Weal ghemoYehdn Intim Plver Lovely SMN Wotle ghpmefduhlcl entl ReepAden RYv8aW1W AeceploGe pe[L[ arrJOkCLaric moreritit influx: rAr.� El«y`w Government Agencies and Regulatory Programs All government agencies play an important role in establishing programs to address stormwater pollution. Federal agencies are tasked with establishing nationwide programs. The State of Florida has established regulations by adopting the appropriate Code of Federal Regulations title into the Florida Statutes and the Florida Administrative Code. Water management districts such as St John's Water Management District, function under these codes and require agency permits for the construction and operation of storm water management systems, storm water usage, or storm water quality monitoring plan. Sebastian Stormwater Master Plan Update Page 39 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Local governments play a role in establishing regulatory programs that provide opportunities to meet specific objectives. These measures must comply with state and federal mandates and should address such issues as hazardous materials, codes, zoning, land development and land use regulations, water shortage and conservation policies, and controls on types of flow allowed to drain into sanitary municipal storm sewer systems. For a local program to be successful, the following elements should be considered: • Community/business composition • Land use patterns • Local practices • Community concerns • Institutional characteristics. Ordinances are rules or laws issued by a local government under legal authority granted by statutes. They include findings of fact, objectives or purposes, definitions, permitting requirements, variances, performance/design standards, and enforcement policies. Low Impact Development (LID) LID is an approach to land development (or re -development) that works with nature to manage stormwater as close to its source as possible. LID employs principles such as preserving and recreating natural landscape features, minimizing effective imperviousness to create functional and appealing site drainage that treat stormwater as a resource rather than a waste product. There are many practices that have been used to adhere to these principles such as bio retention facilities egetated rooftops, rain barrels, and permeable pavements. By implementing LID principles and practices, water can be managed in a way that reduces the impact of built areas and promotes the natural movement of water within an ecosystem or water shed. Applied on a broad scale, LID can maintain or restore a watershed's hydrologic and ecological functions. Hydrologic functions such as filtration, frequency, and volume of discharges, and ground water recharge can be maintained by reducing impervious surfaces, functional grading, open channel sections, reuse of runoff and using multifunctional landscape features such as rain gardens, swales, mulch, and conservation areas. LID has been characterized as a sustainable stormwater practice by the Water Environment foundation and others (EPA, 2013). Educational and Outreach Programs Public education and outreach programs can be implemented to meet any individual or community needs. The public is often unaware that the combined effects of their actions can cause significant non -point source pollution problems. Outreach programs should be part of a community's overall plan for stormwater management to educate employees, the public, and businesses about the importance of protecting stormwater from improperly used, stored, and disposed pollutants. Proper education on day-to-day activities such as recycling of used automotive fluids, household chemical and fertilizer use, animal waste control and other activities can significantly reduce non -point source pollutant loadings to urban streams. A public education plan should consist of several kinds of activities that may include the following: • Public surveys to assess use of toxic materials, disposal practices, and overall environmental awareness. • Frequent and consistent campaign messages using a mission statement, logo, and tag line. Sebastian Stormwater Master Plan Update Page 40 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 • Campaign products such as door hangers, pamphlets, guidebooks, signs, press releases, or classroom /library displays. • Public outreach activities such as having a field day where a local water quality expert comes to a community to demonstrate ways of reducing pollution. • Neighborhood programs such as the following: o Identifying storm drains with stenciling to discourage dumping. o Distributing toxics checklist for meeting household hazardous waste regulations. o Producing displays and exhibits for school programs. o Distributing free seedlings for erosion control. o Creating volunteer opportunities such as water quality monitoring. • Informing residents about picking up pet waste or installing pet waste bags and containers • Demonstrating to residents how to compost lawn debris. • Distributing brochures about recycling of oil and antifreeze. • Distributing brochures about pesticides and fertilizers. See the City of Sebastian, Florida's website — http://sebastiannrb.com Operation and Maintenance (O & M) Maintenance programs are necessary in order to reduce the pollutant contribution from the urban landscape and to ensure that stormwater collection and treatment systems are operating as designed. Non-structural maintenance and operational procedures can be used to prevent or reduce the need for more costly structural treatment controls. The Florida Department of Environmental Protection has reported that nearly 70 percent of existing treatment facilities in Florida are not properly maintained and therefore do not provide the intended pollutant removal effectiveness. Because of this, one of the most effective non-structural BMPs is routine maintenance of existing treatment facilities. The following are a few of the non-structural maintenance operations: • Turf and landscape management, • Street cleaning, • Catch basin cleaning, • Road Maintenance, • Canal/ditch maintenance, and • Modification of structural operations. Conservation Plan All users (domestic, utility, commercial, agricultural, and recreational) of water have a responsibility and an opportunity to conserve water, to reduce or eliminate the amount of water potentially requiring stormwater runoff treatment. Conservation practices should be promoted in all communities. A good conservation water plan should include a framework for the following components (Marshall, 2002): • Appropriate lawn irrigation. • Adoption of landscape ordinances. • Installation of ultra-low volume plumbing fixtures in new construction. • Adoption of conservation -oriented rate structures by utilities. Sebastian Stormwater Master Plan Update Page 41 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 • Implementation of leak detection programs by utilities with unaccounted for water loss greater than 10 percent. • Institution of public education programs for water conservation. Using Reclaimed Water Recycling water involves disinfecting and treating wastewater and using the reclaimed water for new, beneficial uses such as the following (Marshall, 2002): • Landscape irrigation for parks, golf courses, highway medians, and residential lawns. • Agricultural irrigation for crops, pasture lands, and nursery operations. • Ground water recharging either directly or through rapid infiltration basins • Industrial cooling or in -manufacturing processes. • Creating or restoring wetlands. • Fire protection. • Separate toilet piping systems in industrial or commercial buildings. • Aesthetic enhancements for ponds, fountains, and landscape features. • Dust control for construction sites or unpaved road communities. Pesticide/Herbicide Use Pesticides and herbicides can be a significant source of water quality impairment in urban streams due to their high aquatic toxiCity. According to a 2011 report from the EPA, the United States pesticide usage was 1.1 billion pounds in 2007 or 22 percent of the world estimate of 5.2 billion pounds of pesticide use. The total pounds of U.S. pesticide used decreased by approximately 8 percent from 1.2 to 1.1 billion pounds from 2000 to 2007. The use of conventional pesticides decreased about 3 percent from 2002 to 2007 and 11 percent from 1997 to 2007 (EPA, 2011). Herbicides remained the most widely used type of pesticide in the in the agricultural market sector and were also the most widely used type of pesticide I the home and garden and industrial, commercial, and governmental market sectors (EPA, 2011). A significant portion of these applications find their way into stormwater runoff and ultimately into receiving streams through spray drift, transport by soils, solubilization by runoff, and by spillage, dumping and improper disposal of containers and residuals. Education on the proper methods of application, application rates and alternatives to pesticides can help to reduce the amount of pesticides that are carried by urban runoff. Alternatives to pesticides, such as in integrated pest management program and pesticide alternatives such as insecticidal soap or natural bacteria, can also reduce the need for pesticides. Fertilizer Use A significant amount of nutrients in urban runoff results from misapplication of fertilizer to the urban landscape. Residential lawn and garden maintenance and maintenance of landscape and turf grass at golf courses, schools and commercial areas uses significant amounts of fertilizers containing nitrogen and phosphorous. Since most fertilizers are water soluble, over—application or application before rainfall events can allow significant quantities to be carried away by stormwater runoff. Education on proper application of fertilizers can help to reduce the quantities of nutrients reaching receiving waters. Sebastian Stormwater Master Plan Update Page 42 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 The City of Sebastian, Florida has an Ordinance (Ordinance No. 0-12-06) regarding the use of fertilizer. See the City of Sebastian Website (www.Citvofsebastian.org) for further details. Automotive Product Disposal Discharge of automotive fluids such as antifreeze and motor oil to storm drains or land can cause significant water quality problems. "Do-it-yourself" automobile mechanics often incorrectly assume that materials that are dumped into storm drains will receive treatment at wastewater treatment plant prior to discharge. Education on appropriate recycling and disposal techniques for these materials can help to reduce pollutant loadings to streams. Education programs should identify the location of community automotive products recycling centers. In addition to impacts associated with dumping used oil and antifreeze, potential runoff pollutant sources from home automobile maintenance activities include dirt, cleaners, oils and solvents from car washing, leaking fluids such as brake and transmission fluid and gasoline spills. City of Sebastian Website - •.ate; - ,g. - 0 - Sebastian Sebastian Stormwater Master Plan Update Page 43 NEEL—SCHAFFER S.1.0ons yvu r n 6u1lu upon 4. Stormwater Quarter Rounds December 6, 2013 i. Quarter Rounds System The Quarter Rounds are standard 12 -inch plastic pipe which is cut into four quarters with holes that allow water to percolate into the grass swales to evenly drain away more efficiently. The quarter section of pipe is connected together and pinned into the existing grass swale. The existing swale is graded to provide a gradual slope. The pipe installation is combined with culvert replacement as needed and driveway replacement by the City crews. The City started the pilot program for the quarter round system as an innovative measure to assist in the managing storm water runoff within the residential streets of the City. The pilot program was initiated with a field review meeting with consultants and members from the St John's River Water Management agency to ensure that the project was permitted by the management agency. At that field review meeting, it was noted by the SJRWMD staff that a typical grass yard swale has the ability to infiltrate about 80 percent of the 3-year/1 hour storm or approximately 2.3 inches within 72 hours. This treatment of grass swales and percolation is questionable and it has been challenged that the treatment provided by the grass swale is marginal as best for infiltration. The City currently is continuing to install quarter rounds within the residential neighbors as a storm water management program. In February, 2011, the City of Sebastian had approximately 40 miles of quarter round installed. There is more than 300 miles of stormwater quarter round swales in the City of Sebastian. The use of the quarter rounds is based on the severity of drainage problems. The quarter rounds have improved the stormwater system overall. Quarter Rounds in Progress — 2012 show that the City has installed over 3,400 linear feet of quarter rounds. The City staff has indicated that many residents do not take care or maintain the plastic quarter round within the yard swale frontage. In many cases, these quarter round swales have become over grown with grass or the quarter round plastic is buried in siltation of soil from the runoff. There were many locations where the installed quarter rounds within the last year were covered with grass for silt. The City has a contract grass cutting crew which cut and maintains the drainage swales. ii. Testing of Quarter Rounds As part of the stormwater update, the City's implementation of the quarter round system was field tested to determine the infiltration and conveyance of stormwater runoff. A test site was identified by City staff for an actual field condition testing of the quarter rounds. The site scheduled was installed with quarter rounds within a two week period. The field test required a pre -condition test and then a post -condition test with the new quarter round installed. The City provided a tanker truck which carried 3,000 gallons of water to be discharged into the test site for the pre and post condition tests. The site was measured and timed for the drainage runoff of water from the starting point to where the drainage flow ended along the existing grass swale. Sebastian Stormwater Master Plan Update Page 44 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Pre -condition Grass Swale: March 27, 2013 was the initial test date for the grass swale. The nature of the grass swale slope was very flat, which resulted in more ponding than movement. The water movement only occurred when there was sufficient head for the water to move. The water pump truck stopped discharging water at 1:53 pm, resulting in about 53 minutes of total pump time. On March 28, 2013 another test was conducted and the ground was moist and partially saturated from the 3/27 test. Water hit the 3/27 test 10 min water point at 7minutes and 25 seconds. The water pump stopped discharging water at 10:15 am, resulting in 15 minutes of pump time. The water hit the 3/27 test's final water movement point (after 45min) after only 20 minutes. The vegetation and dry soil passed the 3/27 test's 45 min point resulted in higher absorption and slower movement. The water stopped progressing at the 25 min mark. A little water moved passed that, but was absorbed into the ground almost immediately. Before Quarter Round After Installation Post Condition Test with Quarter Round The initial grass swale ground was very dry. Once the ground became saturated, the water entered the quarter rounds. This took approximately 2 minutes. The slope was very small, which resulted in more ponding than movement because the ground was very dry. Movement in the quarter round only occurred when there was sufficient water head (energy) to move the water, but once the water had more head (energy), it flowed freely on the plastic quarter round. The post testing was conducted twice since the original ground with new quarter round was significantly dryer than normal condition. A second test was conduct to reflect a more normal quarter round runoff and percolation conditions. Sebastian Stormwater Master Plan Update Page 45 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Dry Test Condition The water pump stopped discharging water at 1:20 pm, resulting in about 14 minutes of total pump time. Wet Test Condition The discharge of water began at 9:58 am on Tuesday, April 16, 2013 and ended at 10:15 am, resulting in 17 minutes of pump time. The ground was moist and saturated from the rain that occurred on April 14, 2013. (Amount of rain unknown.) Because of the saturation of the ground, the water entered the Quarter Round at 10:00 am or 2 minutes after the water was discharged. At the 5 minute mark, the water had traversed 82 feet which was 44 feet (38 feet mark) farther than the unsaturated test on April 11tH The water hit the 4/11 test's final water movement point after 13 minutes. Because the ground had been saturated from the rain on April 14, 2013, the water traveled quickly down the Quarter Round. It traveled 294 feet in 25 minutes before it came to a complete stop. The water was being absorbed the slower the water moved. The data collected from the four test sampling are tabulated on the chart below for the pre and post condition tests with the velocity, flow and distance traveled by the flow. It is noted that in both pre and post test samples, that the wet condition allowed for the flow of water to travel farther along the swale and quarter rounds. (See appendix for calculations) Based on the field testing, the storm water within the quarter round system traveled farther than water traveling on grass swales. This travel distance is based on the roughness coefficient of grass which is greater than the smooth surface of the plastic quarter round material. In addition, water is conveyed a distance farther than water on the grass swale with or without percolation. Therefore, the percolation rate for the quarter rounds is not equal, but considerably less than the percolation rate for grass swales. Base on the data collected, the water travels almost twice the distance in the quarter round system than on the grass swale from 134 feet (pre) to 294 feet (Post). Therefore, the quarter round system is conveying storm water with double the travel flow distance than grass swale. This means the storm water within the quarter round system is approximately twice as fast in flowing the runoff during peak storm events. Sebastian Stormwater Master Plan Update Page 46 Pre -Condition Test Post -Condition Test Test Factors Collected March 27, 2013 March 28, 2013 April 11, 2013 April 17, 2013 VeloCity 2.87 ft/min 4.48 ft/min 11 ft/min 11.8 ft/min Flow 12.3 ft/sec 20.08 ft/sec 82.15 ft/sec 115 ft/sec Distance 129 ft — 48 min 134 ft — 30 min 222 ft — 20 min 294 ft — 25 min Based on the field testing, the storm water within the quarter round system traveled farther than water traveling on grass swales. This travel distance is based on the roughness coefficient of grass which is greater than the smooth surface of the plastic quarter round material. In addition, water is conveyed a distance farther than water on the grass swale with or without percolation. Therefore, the percolation rate for the quarter rounds is not equal, but considerably less than the percolation rate for grass swales. Base on the data collected, the water travels almost twice the distance in the quarter round system than on the grass swale from 134 feet (pre) to 294 feet (Post). Therefore, the quarter round system is conveying storm water with double the travel flow distance than grass swale. This means the storm water within the quarter round system is approximately twice as fast in flowing the runoff during peak storm events. Sebastian Stormwater Master Plan Update Page 46 NEEL—SCHAFFER 5n1u0ons yvu r n 6u1rd upon Quarter Round Improvements December 6, 2013 'rogross ound FY 2011 found FY 2012 !ound FY 1093 !ound FY 2014 ound FY 2015 found FY 2010 or Round FY 2017 rtor Round FY 2010 }rtor Round FY 2019 Quarter Round FY 2020 sad Quarter Round FY 2021 posed Quarter Round FY 2022 'reposed Quarter Round FY 2023 Proposed Quarter Round FY 2024 Proposed Quarter Round FY 2025 K Proposed Quarter Round FY 2025 Proposed Quarter Round FY 2027 Proposed Quarter Round FY 2028 {� Proposed Quartor Round FY 2029 Proposed Quarter Round FY 2070 Proposed Quarter Round FY 2071 Quarter Round Map as of January, 2012 for City of Sebastian, Florida Proposed Quarter Round FY 2032 Proposed Quarter Round FY 2033 Proposod Quarter Round FY 2014 Proposed Quarter Round FY 2035 Proposed Quarter Round FY 1030 Sebastian Stormwater Master Plan Update Page 47 NEEL-SCHAFFER S.1.0ons yvu r n 6u1lu upon December 6, 2013 BARBER S'MET llRAU'IG& AND RENLVING SEA DR. TO LAEE'MW D'. Provided by the City of Sebastian, Florida 2013 Sebastian Stormwater Master Plan Update Page 48 r J�1J�►.4 -- y 7 _ I 1 _ I ++■fYY �Y 4 . y BARBER S'MET llRAU'IG& AND RENLVING SEA DR. TO LAEE'MW D'. Provided by the City of Sebastian, Florida 2013 Sebastian Stormwater Master Plan Update Page 48 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon 5. Conclusion and Findings December 6, 2013 The Master Plan Stormwater Update provides the City with a drainage analysis for the mean annual 25 to 100 year/24 hour storm event for both the existing and future land use conditions. Based on an updated drainage modeling analysis and new topographical GIS mapping, the Interconnected Channel and Pond Routing Model (ICPR) model performed; simulations runs of the City's stormwater system and identified areas of deficient drainage needs. The following is a summary and listing of storm water improvement projects. 1. Existing 2004 CDM Model/Study 2. Update on previous master plan analysis 3. Field review and verify of existing system 4. Created new GIS maps for the system 5. Developed two drainage groups (Northern and Southern sections of the City) 6. Created new hydrologic parameters 7. Analyzed the system with Interconnected Channel and Pond Routing (ICPR) model 8. Revised model per stage flow and capacity 9. Identified Stormwater deficiencies. 10. Updated two systems • Northern 1,769 acres • Southern 4,583 acres 11. Third area not modeled - East of US 1 Capital Stormwater Projects — Presented to City Council in February 2013 Stormwater Protects • A - Indian River Drainage Improvement • B - Collier Canal Hardy Dam • C - Potomac Ave Lateral Pipe • D — BlossomMentworth Ditch Piping • E - Stonecrop Pipe/culverts (Bevan & Laconia) • I — Future South Area Basin • J — Southeast Dredge Basin • K — Tulip Pipe Replacement (culvert 42"x72") • L — EastMest Lateral Drainage Pipe • M — Tulip Detention Basin • N — George St. Canal Dredging • O — Rosebush Terrace Pipe — Twin 48" • P — Landdowne Drive Pipe — Twin 36" Total Stormwater Improvements Annual Maintenance F — Replace CMP — Maintenance G — Quarter Rounds Installation H — Backyard Ditches Maintenance Total Stormwater Improvement Costs (per 2013) Construction Cost $2,000,000 $ 100,000 $ 200,000 $1,000,000 $1,000,000 $ 300,000 $ 500,000 $ 100,000 $ 500,000 $ 250,000 $2,500,000 $ 100,000 $ 100,000 $8,650,000 $ 200,000 $ 250,000 $1,000,000 $1,450,000 Sebastian Stormwater Master Plan Update Page 49 NEEL-SCHAFFER S.1.0ons yvu r n b.bd upon December 6, 2013 Stormwater Master Plan Update Page 50 NEED—SCHAFFER $.!.tions you can 1 uii f upon Quarter Round Base "Wet" Tests and After Quarter Round Installation Results and Notes Prepared by: Neel -Shaffer March 28, 2013 April 11, 2013 29258 20t' Street • Vero Beach, FL 32960 • phone 772-770-4707 • fax 772-770-4640 • www.neel-schaffer.com March 27th, 2013 First Quarter round base "wet" test: Total: 4,500 gallons of water sprayed at the corner of Warren Street and Spire Avenue, in front of 701 Spire Avenue. Total distance of water movement: 1St discharge (3,000 gallons): 129' 0" 2" d discharge (1,500 gallons): 84' 6" Water Movement (from first discharge site): Time (min) Distance (feet) 10 49' 11" 15 69' 3" 20 98' 1" 25 112' 6" 30 115' 3" END OF 3,000 GAL. MOVEMENT 35 116' 4" 40 121' 1" 45 129' 0" END OF ADDITIONAL 1,500 GAL. MOVEMENT Percolation Rate = Amount of water (gal) / Percolation time (min): 4,500 gallons / 45min =100 gal/min Velocity = Distance (ft) / Time (min): 129 ft / 45 min= 2.87 ft/min Area (sf) = Width x Length 2' X 129' = 258 sf (square feet) Flow Rate = Area (sf) x Velocity (ft/min): 258 sf x 2.87 ft/min = 740.46 cf (cubic feet) /min NOTES: Slope was very small, which resulted in more ponding than movement. Movement only occurred when there was more head to the water. Water pump stopped discharging water at 1:53 pm, resulting in about 53 minutes of total pump time. 2 DL NEEL—SCHAFFER 1 5OJ-1...... tan Lund —.- March 28th, 2013 Second Quarter round base "wet" test: Total: 3,000 gallons of water sprayed at the corner of Warren Street and Spire Avenue, in front of 701 Spire Avenue. Total distance of water movement: From discharge point to end movement point: 134' 6". Water Movement (from discharge site): Time (min) Distance (feet) 10 62' 9" 15 98' 3" 20 129' 4" 25 134' 0" "Water movement stopped here 30 134' 6" END OF 3,000 GAL. MOVEMENT Percolation Rate = Amount of water (gal) / Percolation time (min): 3,000 gallons / 30 min =100 gal/min Velocity = Distance (ft) / Time (min): 134.5 ft / 30 min= 4.48 ft/min Area (sf)= W x L 2 X 134.5 = 269 sf Flow Rate = Area (sf) x Velocity (ft/min): 269 sf x 4.48 ft/min = 1205.1 cf/min NOTES: The ground will be moist and partially saturated from the 3/27 test. Water hit the 3/27 test 10 min water point at 7minutes and 25 seconds. Water pump stopped discharging water at 10:15 am, resulting in 15 minutes of pump time The water hit the 3/27 test's final water movement point (after 45min) after only 20 minutes. The vegetation and dry soil passed the 3/27 test's 45 min point resulted in higher absorption and slower movement. The water stopped progressing at the 25 min mark. A little water moved passed that, but was absorbed into the ground almost immediately. DL NEEL—SCHAFFER 1 5OJ-1...... tan Lund —.- April 111h, 2013 First Quarter round base test with quarter round installed: Total: 3,000 gallons of water sprayed at the corner of Warren Street and Spire Avenue, in front of 701 Spire Avenue. Total distance of water movement: Discharge (3,000 gallons): 222' Water Movement: Time (min) Distance (feet) 5 38' 10 111' 15 174' 20 222' Percolation Rate = Amount of water (gal) / Percolation time (min): 3,000 gallons / 30 min =100 gal/min Velocity = Distance (ft) / Time (min): 222 ft / 20 min= 11.1 ft/min Area (sf)=WxL Area = 222' x 2' = 444 sf Flow Rate = Area x Velocity (ft/min): 444 sf x 11.1 ft/min = 4928.4 cf/min NOTES: Quarter rounds were installed. (A quarter round is a piece of plastic piping with wholes for percolation cut into quarters and installed in a swale.) The ground was very dry. Once the ground became saturated, the water entered the quarter rounds. This took approximately 2 minutes. The slope was very small, which resulted in more ponding than movement because the ground was very dry. Movement in the quarter round only occurred when there was more head to the water but once the water had more head, it flowed freely on the plastic quarter round. The water pump stopped discharging water at 1:20 pm, resulting in about 14 minutes of total pump time. 4 DL NEEL—SCHAFFER 1 5OJ-1...... tan Lund —.-