The URL can be used to link to this page

Home My WebLink About2008 CommunicationsPage 1 of 4 Joseph Griffin From: Gretchen Reinertson [greinertson@sjrwmd.comj Sent: Tuesday, December 09, 2008 2:00 PM To: 'Jansen, Mark'; Rebecca Grohall; Joseph Griffin Cc: Sample, Hillary; Janice Unger Subject: RE: Sebastian Airport Hangar'A', Application #40-061-68172-11 Good Afternoon, I just talked to Janice about your request to remove some existing asphalt prior to permit issuance. The requested construction/demolition activities are not authorized until the permit is issued. We suggest that you submit your RAI response as soon as possible so that we can review it sooner rather than later. If everything looks good after my review, I will let you know if staff is recommending approval for permit issuance. This way, you can get to work while the permit is being generated, which could give you a few days or more of a head start. In addition, I suggest that everyone coordinates with one another concerning the application submittal for the maintenance building. To reiterate, a permit is required to obtain "after -the -fact" authorization for construction of the maintenance building. The District is looking for commitment and a date certain for the submittal and completion of the application, and we request a written statement indicating such. Feel free to contact me if you have any questions Gretchen Reinertson, Engineer St. Johns River Water Management District Department of Water Resources 525 Community College Parkway Palm Bay, FL 32909 Voice: (321) 676-6602 Fax: (321) 722-5357 From: Jansen, Mark [mailto:MJansen@lpagroup.com] Sent: Monday, December 08, 2008 3:15 PM To: Rebecca Grohall; Joseph Griffin; Gretchen Reinertson; Janice Unger Cc: Sample, Hillary Subject: RE: Sebastian Airport Hangar'A', Application #40-061-68172-11 Rebecca, We just spoke with Gretchen (while you were calling!), and I believe we have it all resolved. I believe Janice will register an opinion on the impervious surface, etc., but we will have the RAI answered by Wednesday evening and uploaded after that. Mark Jansen LPA Orlando Office 321.695.5061 (m) From: Rebecca Grohall[mailto:RGrohall@CityOfSebastian.org] Sent: Monday, December 08, 2008 2:47 PM 11911 7hi1I1J•j Page 2 of 4 To: Joseph Griffin; greinertson@sjrwmd.com; junger@sjnvmd.com Cc: Jansen, Mark Subject: RE: Sebastian Airport Hangar'A', Application #40-061-68172-11 Gretchen - Thanks for speaking with me earlier. I appreciate the time you took with me today On the maintenance building - its my understanding that the City needs an after the fact permit for that building. believe its the City's intent to apply for that permit separately ASAP. If its not coming in a separate permit, I'll make certain that the permit for Hangar A is including the maintenance building. I plan on contacting Janice directly, but if we could receive some consideration to remove the existing asphalt for Hangar A, that would be helpful to us. Thanks! Rebecca From: Joseph Griffin Sent: Friday, December 05, 2008 3:55 PM To: Rebecca Grohall Subject: FW: Sebastian Airport Hangar'A', Application #40-061-68172-11 -----Original Message ----- From: Gretchen Reinertson [mailto:greinertson@sjrwmd.com] Sent: Friday, December 05, 2008 3:14 PM To: 'Jansen, Mark'; Janice Unger Cc: Sample, Hillary; Regulatory Permitting Application Submittal; Hambrecht, Rob; Joseph Griffin; Mark Crosby; Gruebel, Timothy L. Subject: RE: Sebastian Airport Hangar'A', Application #40-061-68172-11 Mark, I'm a little confused about the funding issues, but I do have a few other questions/concerns: The Airport Drive/Maintenance application that you are expecting to submit on Dec 1 gth — is this part of the same application as the "conceptual" application that you were referring to in our Sept 19th meeting? If so, this is a problem because a "conceptual" permit cannot authorize construction. A separate ERP is required for the construction aspect. However, if the Airport Drive/Maintenance application is simply an application for the construction of those two items and their associated stormwater system, then this may not be a problem since you are getting to submit this application within 2 weeks. In comment #142 of your e-mail, are you saying that you can't include the maintenance building within the Hangar A application due to the grant issues, or are you just concerned that incorporating the maintenance building into the Hangar'A' application now will delay permit issuance, and therefore, delay construction of Hangar A? We don't really have "early work" permits. However, if there is existing pavement or other impervious within the Hangar A project limits, sometimes we can give you the go-ahead on demolition of the existing impervious. We would have to talk to Janice about that. Please call me to discuss this at your earliest convenience. Thank you, and have a good weekend. Gretchen Reinertson, Engineer 12/9/2008 Page 3 of 4 St. Johns River Water Management District Department of Water Resources 525 Community College Parkway Palm Bay, FL 32909 Voice: (321) 676-6602 Fax: (321) 722-5357 From: Jansen, Mark [mailto:MJansen@lpagroup.com] Sent: Wednesday, December 03, 2008 5:43 PM To: Gretchen Reinertson; Janice Unger Cc: Sample, Hillary; Regulatory Permitting Application Submittal; Hambrecht, Rob; JGriffin@CityOfSebastian.org; Mark Crosby; Gruebel, Timothy L. Subject: RE: Sebastian Airport Hangar'A', Application #40-061-68172-11 Hello Janice and Gretchen, We have discussed this with all people in this office who are working on the Stormwater Master Plan Update/Airport Drive East project, and respectfully request that the Maintenance Building be included in the Airport Drive East project (application imminent) rather than the Hangar A project (current subject application). We request this for the following reasons: 1. The funding for the Airport Drive and Maintenance building drainage system is a separate FDOT grant than the Hangar A project. Because of these grant issues, it is not possible to construct anything not directly related to the Hangar A project. 2. The FDOT grant for the maintenance building is running into a timing problem, and the Airport needs to keep moving on the Hangar project. The SJRWMD permit is the last in a series that is required to start the project. 3. The Airport Drive/Maintenance project is making good progress. The schedule is attached, with a submittal to the District expected December 19 (clouded on schedule). 4. We would prefer not to construct a patchwork "temporary" pond for the Maintenance building, but rather incorporate it into the overall permanent master permit system. I have attached the schedule for the airport drive east project. I will also be sending you a separate e- mail showing our overall basin delineation work for the Airport Drive East/Master plan. If it is not possible for this to happen, can an "early work" permit be issued by the District for the actual Hangar A portion of the project? If you have any other alternatives, we would be open to discussion. Again, we respectfully request that the maintenance building be included in the forthcoming Airport Drive East project. We appreciate your consideration. Thank you, Mark Mark C. Jansen, P.E. THE LPA GROUP INCORPORATED 615 Crescent Executive Court, Suite 200 Lake Mary, Florida 32746-2146 407.306.0200 (o) 1 321.695.5061 (m) From: Gretchen Reinertson [mailto:greinertson@sjrwmd.com] Sent: Monday, November 24, 2008 2:15 PM 12/9/2008 Page 4 of 4 To: Jansen, Mark Cc: Sample, Hillary; Janice Unger; Regulatory Permitting Application Submittal Subject: Sebastian Airport Hangar'A', Application #40-061-68172-11 Good Afternoon Mark, It is my understanding that the unauthorized maintenance building will be included in the current permit application for Hangar A. I just took a quick look at the plans submitted with your RAI response, and the maintenance building does not appear to be included within the scope of the project. A stormwater system is required for the maintenance building, so the plans and computations should reflect this. Please advise on this matter as soon as you get a chance. Thank you. Gretchen Reinertson, Engineer St. Johns River Water Management District Department of Water Resources 525 Community College Parkway Palm Bay, FL 32909 Voice: (321) 676-6602 Fax: (321) 722-5357 Confidentiality Notice This message is intended exclusively for the individual or entity to which it is addressed. This communication may contain information that is proprietary, privileged, confidential or otherwise legally exempt from disclosure. If you are not the named addressee, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this message in error, please notify the sender immediately either by phone (800-572-1115) or reply to this e-mail and delete all copies of this message. Confidentiality Notice This message is intended exclusively for the individual or entity to which it is addressed. This communication may contain information that is proprietary, privileged, confidential or otherwise legally exempt from disclosure. If you are not the named addressee, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this message in error, please notify the sender immediately either by phone (800-572-1115) or reply to this e-mail and delete all copies of this message. 12/9/2008 E-PERMITTING SIGNATURE DOCUMENT Page 1 of 1 E-Permitting SIGNATURE DOCUMENT Permit Number: 68172 -11 Submittal Confirmation Number: 181926 Project Name: Sebastian Airport Hangar "A" This document is signed and sealed to secure the electronic files referenced by the signature files as described in the Florida Department of Business and Professional Regulation. Signature File Created: Thu Dec 11 15:23:50 EST 2008 Number Signed/Sealed Files: 1 Name: Mark C. Jansen Type of Profesional Registration: PE License Number: 56059 Signature> ' Date: //� Aqe 0 9 _ SIGNATURE FILE NAME: TA412026-RAI #2.pdf SHA-1:1CA44C826D01CC8D8300AA346A2AEB39D9ABDD17 DESCRIPTION: Response to RAI #2 Package — End of Signature Document — §LrATHE LPA GROUP INCORPORATED Transportation Consultants 615 CRESCENT EXECUTIVE COURT ■ SUITE 200 n LAKE MARY, FLORIDA 32746-2146 ■ 407-306-0200 m FAX 407-306-0460 December 11, 2008 Gretchen Reinertson Engineer, Department of Water Resources St. John's River Water Management District 525 Community College Parkway S.E. Palm Bay, FL 32909 Subject: Sebastian Municipal Airport/Sebastian, FL Hangar AMAI #2 Submittal Application No. 40-061-68172-11 Dear Ms. Reinertson: Enclosed, please find the following: + 1 copy of Design Computations, Construction Plans containing supporting information, and a Geotechnical Report Addendum for your convenience Also, please note the following updates since the original submittal: • Drawing Numbers: EX-3, EX-4, C.02.1.2a, & C.02.1.2b have been updated • Design Computations: CN Calculations, Stage -Storage, Water Quality Volume, AdICPR, and PONDS have been updated • All of the following information has also been uploaded on the e-Permitting website The following are responses to your RAI, dated November 25, 2008: 1) Please design a storm water system for the unauthorized maintenance building, and submit revised plans and computations that demonstrate the system satisfies the District's water quality and water quantity requirements. [40C-4.301(1)(a)(b)(e)(i), F.A.C.] Per our communications through email, telephone, and meetings during the months of September, October, and November, The LPA Group Incorporated plans to submit a permit application for the construction of Airport Drive East and the Maintenance Building anticipated by January 16, 2009. 2) Staff is concerned that the dry retention pond will not recover the required treatment volume as proposed. The fillable porosity applied to the PONDS recovery analysis is too high and the treatment volume entered into the model is less than the required volume. Please reduce the fillable porosity and apply the total required treatment ATLANTA ■ BALTIMORE ■ BATON ROUGE ■ CHARLOTTE ■ COLUMBIA ■ FALLS CHURCH ■ GREENSBORO ii IRVINE ■ JACKSOWLLE ■ KENNESAW ■ KNOXVILLE LITTLE ROCK ■ MOBILE ■ NASHVILLE ■ OCEAN SPRINGS ■ ORLANDO ■ RALEIGH ■ SARASOTA ■ TALLAHASSEE ■ TAMPA ■ WEST PALM BEACH Gretchen Reinertson, Page 2 volume to the analysis. Note that based on the SFWMD soil storage curves, the fillable porosity is only about 5%. [40C-4.301(1)(e)(i), F.A.C.] Please see the Geotechnical Report Addendum which states a porosity value between 30 and 40 percent is acceptable. A value of 30 percent was used. Please also see PONDS recovery analysis results under Design Computations. 3) The unsaturated vertical infiltration rate of 19.3 fpd is overestimated. The permeability tests referenced in the geotechnical report are a measure of the saturated soil conditions, and a factor of 2/3 should be applied to determine the unsaturated vertical rate. Please revise the unsaturated vertical infiltration rate. [40C- 4.301(1)(e)(i), F.A.C.] The unsaturated vertical infiltration rate has been revised to 12.8 7fpd. Please see revised PONDS recovery analysis results under Design Compuations. 4) The plans reflect a sump around D-6 that is 2.5 ft below the pond bottom elevation. The sump will contain standing/stagnant water and become overgrown with nuisance vegetation. These conditions may cause difficulties from a maintenance standpoint and may impede stormwater conveyance from the upstream areas. Please revise the stormwater system as needed to eliminate the sump to facilitate stormwater conveyance and maintenance. [40C-4.301(a)(a)(b)(i), F.A.C.] The stormsewer has been completely revised. There is a bubble up structure at the bottom of the pond elevation (19.50 ft) to eliminate any standing water in the pond. Please see Construction Plans, revised grading and drainage plans. 5) The plans indicate that the D-1 grate elevation is lower than the overflow weir invert elevation. Stormwater will back up through D-1 and flood the surrounding area. Please revise the stormwater system design as needed. The structure grate elevations should be higher than the 25-year/24-hour peak stage. [40C-4.301(1)(a)(b)(e)(i), F.A.C.] The peak stage of the pond for the 25 year/24-hour storm is 20.33 feet. The overflow weir is set at 20.0 feet to meet water quality volume requirements. All of the inlets are set at or above 20.40 feet. Please see Construction Plans, revised grading and drainage plans. 6) It appears there is an error in the post -development flood routing. The max outflow from "Ditch C" and max inflow into "Outfall" should not be equal to zero as indicated in the node min/max conditions report. Please review and revise the model as needed. Include both the node and link min/max conditions report with your next submittal. [40C-4.301(1)(a)(b)(i), F.A.C.] The Ad1CPR model has been revised has and the necessary input with no errors. Please see both the node and link min/max conditions reports under the Design Computations. 7) The ICPR input data for pipe "Pre 10" is incorrect based on the survey and the post - development pipe input parameters. Please revise the pipe invert elevation and pipe size applied to the pre -development flood routing. [40C-4.301(1)(a)(b)(i), F.A.C.] Gretchen Reinertson, Page 3 The "Pre 10" link has been changed in the pre-development,llood routing model to reflect the same link "Existing 6" as the post -development flood routing model. Please see revised AdICPR models under the Design Computations. 8) The post -development site conditions do not improve the hydrologic soil conditions in a manner to justify lowering the post -development pervious curve number. Please revise the post -development composite curve number. Given the drainage area and impervious area indicated in the cales, it appears the composite curve number is around 85. [40C-4.301(1)(a)(b)(i), F.A.C.] Please see revised composite curve number calculations under the Design Computations. We appreciate your patience, and look forward to completing the permit modification with you. Should you have any questions, please do not hesitate to call at me or Hillary Sample in the Lake Mary office at 407-306-0200. Sincerely, THE LPA P.E. Project Manager File TA412026.lg