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Home My WebLink AboutWPO201300064 Correspondence 2014-12-14From: Max Greene Sent: Thursday, December 11, 2014 8:49 AM To: 'Nat Perkins' Subject: RE: TNC AL Nat, I forwarded the email to Glenn. We can’t approve a shortfall in treatment, but we can approve a plan that has extra treatment. The extra treatment would be banked for when the rest of the project is developed. The State DEQ allows “banking” treatment for property owners. So, if a property owner has too much treatment on one project they can bank it for their next project. Even if it’s on another parcel across town. We recommend over protecting this project and banking the treatment for next time. Only hangup with the method is the owner has to be exactly the same on each parcel for “banking” and LLC’s are now considered people by the Government… so one LLC can’t give treatment credit to another LLC even if it is the same actual person that has the LLC’s. Thanks, Max From: Nat Perkins [mailto:nat.perkins@gmail.com] Sent: Thursday, December 11, 2014 8:10 AM To: Max Greene Subject: RE: TNC AL Max – Attached is the revised VRRM. I have made the following changes: 1)Changed the filterra removal rate to 50%. 2)Added the extended detention pond as part of the treatment chain. The first treatment measure are the filterras. The next is a grass channel beyond the outfall. The third is the extended detention of the basin. This yields a total phosphorus removal needed of .08 #/yr. I wanted to meet with you and Glenn and see what is the best way to handle the remaining removal – prefer not to use the mitigation bank, but that may be the only choice… Let me know when you can meet to discuss. Thanks Nat Nat Perkins, P.E. | NP Engineering | nat.perkins@gmail.com 434.531.7387 Cell From: Max Greene [mailto:MGreene@albemarle.org] Sent: Wednesday, December 10, 2014 9:25 AM To: Nat Perkins Subject: RE: TNC AL Nat, The VRRM is still not correct. The Filterra needs to be adjusted to the State’s 50% removal rate and then if the site is short (which I’d stated previously) they’ll need to purchase the additional load requirement from one of the State Page 1 of 2 5/7/2015file:///X:/2013/WPO/WPO201300064%20-%20Three%20Notch'd%20Road/RE%20TNC%20AL.htm approved mitigation banks. Once the County attorney’s office approves the purchase then I can send an approval letter allowing the owner to submit the Bond establishment form to Ana Kilmer. Please resubmit the VRRM spread sheet with the 50% Filterra removal rate. The owner will need to submit the legal purchase agreement and DEED book and page number where it’s recorded. Ana Kilmer is the person to contact to make sure this is written and recorded correctly for the County Attorney. Thanks, Max From: Nat Perkins [mailto:nat.perkins@gmail.com] Sent: Wednesday, December 10, 2014 8:37 AM To: Max Greene Subject: RE: TNC AL Max – Will you be determining the bond amount? I will need that to give to Jo so they can post… Let me know if anything else is needed for approval. Thanks Nat From: Max Greene [mailto:MGreene@albemarle.org] Sent: Tuesday, December 09, 2014 1:25 PM To: Nat Perkins Subject: RE: TNC AL Nat, I’ll look for it downstairs. The registration form information is entered after the bond is posted and approved, see attachment letter with flow chart. Max From: Nat Perkins [mailto:nat.perkins@gmail.com] Sent: Tuesday, December 09, 2014 12:07 PM To: Max Greene Subject: TNC AL Max – I submitted the SWPPP documents for the TNC Auto Laundry project today. Let me know if you have any questions. We submitted the registration form (to the County) some time ago. Have you received the letter from the state yet? Thanks Nat Nat Perkins, P.E. | BEND Properties | nat.perkins@gmail.com 434.531.7387 Cell Page 2 of 2 5/7/2015file:///X:/2013/WPO/WPO201300064%20-%20Three%20Notch'd%20Road/RE%20TNC%20AL.htm Now' *gape NP Engineering To: Max Greene From: Nat Perkins CC: Date: 11/10/2014 Re: TNC AL-WPO Revisions Comments: Max- Please find attached two full size copies of the revised WPO plans for the TNC AL project.The revision includes adding the paved entrance detail to the plans. Please let me know if you have any questions or need additional information. Thanks Nat 434.531.7387 680 IVY FARM DRIVE • CHARLOTTESVILLE.VIRGINIA 22901 VOICE (434) 531-7387 1 NP Engineering October 9, 2014 County of Albemarle Department of Engineering c/o Max Greene 401 McIntire Road Charlottesville,VA 22901 RE: Three Notch'd Center (SDP2013-029) WPO Plan Amendment Revisions Dear Mr. Greene: Please find attached two copies of the revised WPO plan for the Three Notch'd Center, Auto Laundry project. As per our previous meetings, I have made the following revisions to the plan: 1) The limits of disturbance for the initial phase have been modified to only the areas of disturbance.The attached VRRM spreadsheet reflects this revision and meets the VSMP guidelines and criteria. We are currently seeking approval for the construction of the initial phase. It is understood that the final phase construction plan will need to be revised and approved to meet the state stormwater guidelines at the time of construction (schedule to be determined). However, the final phase construction plan does show the concept and overall strategy to meet these guidelines, as per the previously approved site plan.The property owner reserves the right to pursue "grandfathering" of the plan, but as stated previously, approval for the initial phase construction is requested at this time. Per your comment letter dated August 28, 2014, please see the responses below. D. VSMP:SWPPP and Pollution Prevention Plan (WPO2014000064) (The Virginia storm water management program, stormwater pollution prevention plan application and documents) 1. Please provide a VSMP application,a full copy of the SWPPP documents,and fees. Response: The VSMP application and fees have been previously submitted on August 6, 2014.The Stormwater Pollution Prevention Plan will be submitted once the "operator"is identified. o pe,g p l-o& I S O w N e.12 — E. VSMP:SWPPP:Stormwater Management Plan (WPO20140000064) 1. The plan must demonstrate compliance with quality and quantity requirements using the Runoff Reduction Method 680 IVY FARM DRIVE • CHARLOTTESVILLE. VIRGINIA 22901 • PHONE: (434) 531-7387 • WPO Plan Amendment comments-Three Notch'd Center Auto Laundry (SDP2013-029) Page 2 October 9, 2014 Response: The VRRM spreadsheet calculations/printout is attached. 2. All BMP's must meet state specifications Response: The VRRM spreadsheet calculations/printout is attached. F. VSMP:SWPPP: Erosion and Sediment Control Plan (WPO2014000064) 1. The erosion and sediment control portion of the plan appears to be approvable under the new State guidelines. Response: No response. I trust that the above comments are adequately addressed for the WPO plan.Should you have questions regarding the revisions, please call me at (434) 531-7387. Sincere , / \A)■"' Nat Perkins, P.E. 680 IVY FARM DRIVE • CHARLOTTESVILLE.VIRGINIA 22901 • PHONE: (434) 531-7387 • NP Engineering July 16, 2014 County of Albemarle Department of Engineering c/o Ms. Michelle Roberge 401 McIntire Road Charlottesville, VA 22901 RE: Three Notch'd Center (SDP2013-029) WPO Plan Amendment Revisions Dear Ms. Roberge: Comments from Engineering Erosion Control (comments dated May 6, 2014): 1. No comments-E&S plan okay. Comments from Engineering Stormwater Management(comments dated May 6, 2014): 1. The method for modeling the basin and outlet is not the 24 hour storm. It appears a larger volume of detention is needed. I recommend raising the spillway and top of embankment. [Revision 1] Comment not addressed.We discussed,during previous discussion, raising spillway and top of embankment 1' based off of SCS Method. Response: The revised calculations, using the SCS 24 hour storm method, are attached. 2. On title page,strike out sheets not shown in submittal. Response:Sheets not shown in the submittal are struck out. 3. On title page,include E&S and SWM in title. Response: E&S and SWM is included in the title. I trust that the above comments are adequately addressed for the WPO plan.Should you have questions regarding the revisions, please call me at (434) 531-7387. Sincere , C l Nat Perkins, P.E. 680 IVY FARM DRIVE • CHARLOTTESVILLE, VIRGINIA 22901 • PHONE: (434) 531-7387 • NP Engineering April 11, 2014 County of Albemarle Department of Engineering c/o Ms. Michelle Roberge 401 McIntire Road Charlottesville, VA 22901 RE: Three Notch'd Center (SDP2013-029) WPO Plan Amendment Revisions Dear Ms. Roberge: Comments from Engineering Erosion Control(comments dated October 24, 2013): Relocate construction entrance. Response: CE has been relocated to extend to the limits of disturbance for the initial phase. V 2. Show TS symbol and stockpile area with silt fence. Response:TS label has been added with stockpile area shown. "f3. Show E&S measure along southern boundary for final phase. Response:Silt fence has been added along the southern boundary. 4. Diversion dikes need positive drainage to outlet. Address sharp bend for DD.Show positive grade or provide SCC. Response:A note to the contractor has been added to ensure positive drainage is provided during construction along the DD. Comments from Engineering Stormwater Management(comments dated October 24, 2013): 1. All 1.71 acres of impervious area does not appear to be treated by Filterra. Please clarify. Response:Filterra areas and layout have been analyzed and revised. See attached Filterra letter. 2. The method for modeling the basin and outlet is not the 24 hour storm. It appears a larger volume of detention is needed. I recommend raising the spillway and top of embankment. Response:The modified rational method is an accepted method of basin modeling. 3. Include stormwater caics, profiles,stormwater DA's with this plan. Response:Stamped calculations are attached. 680 IVY FARM DRIVE • CHARLOTTESVILLE, VIRGINIA 22901 • PHONE: (434) 531-7387 • WPO Plan Amendment comments-Three Notch'd Center Auto Laundry (SDP2013-029) Page 2 April 11, 2014 4. Invert in and out are flipped for both structures 2A1 and 2B1 (sheet 10 of the site plan submittal) Response: The inverts in and out have been corrected. 5("e 5. Update storm calcs. Response:Storm calculations are attached. I trust that the above comments are adequately addressed for the WPO plan.Should you have questions regarding the revisions, please call me at (434) 531-7387. Sincer L/47 Nat Perkins, P.E. 680 IVY FARM DRIVE • CHARLOTTESVILLE.VIRGINIA 22907 • PHONE: (434) 531-7387 • Vow' vow" Nat Perkins NP Engineering 680 Ivy Farm Dr. � � �� Charlottsville, VA. 22901 Grouing idea in Stum malcr Filtcmon April 10, 2014 Plan Review of Filterra® Three Notch'd Center, Albemarle, VA Dear Sirs Thank you for submitting the revised plans on 10 April 2014 for our review of the Three Notch'd Center project. Filterra® structures F1 (6x6), F2 (6x6), F3 (6x4), F4 (10x6), F5 (13x7), F6 (6x4), and F7 (6x4) were studied for; • Planned Filterra®box size • Filterra®contributing drainage area meeting project's regional sizing specification • Filterra® invert elevations are higher than effluent invert elevations • The bypass is lower than the Filterra®elevation(spot elevations) • The grading pattern encourages cross linear flow and not head-on flow • The Filterra® outlet drain pipe is sized correctly and exits perpendicular to the wall • For any conflicting structures such as storm drain pipes below Filterra® •For most efficient placement of Filterra® units The plan review concluded that the Filterra® structures listed above is sited and sized appropriately to treat stormwater to our published specifications. Operational consistency with these specifications is contingent upon the stormwater unit being installed correctly and according to the plans, as well as regular maintenance being performed. Installation Help documents will be forwarded to the Buyer at time of order. The Filterra° Installation, Operation and Maintenance Manual will be made available upon request. Yours sincerely Drew Quinn Engineer Support Filterra® Bioretention Systems Manufactured by Americast T:(804)798-6068 A M E R I CAST 11352 Virginia Precast Road F:(804)798-8400 not just concrete,concrete solutions. Ashland,VA 23005 E:design @filterra.com www.filterra.com