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HomeMy WebLinkAboutWPO201500030 Correspondence 2015-07-24 '...... Ala �.� W ENGINEERS SURVEYORS PLANNERS ASSOCIATES July 24, 2015 Justin Deel, Engineer II County of Albemarle Department of Community Development 401 McIntire Road, Room 227 Charlottesville, VA 22902 Re: Farmington Country Club—East Nine Improvements VSMP and Mitigation Plan WPO 2015-00030 WWA Project No. 214045.05 Dear Mr. Deel: This letter is to document and respond to your review comments dated June 11, 2015. Our responses are as follows: A. Stormwater Pollution Prevention Plan (SWPPP) 1. Comment: Not found. Please provide a SWPPP addressing all items in County Code Section 17-405, using the standard template from the County website. Response: The SWPPP is included in this resubmission. B. Pollution Prevention Plan (PPP) 1. Comment: Not found. Please provide a PPP addressing all items in County Code Section 17-404. Response: The PPP is included in this resubmission as part of the SWPPP. 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434)978-1444 Charlottesville •Lynchburg C. Stormwater Management Plan (SWMP) 1. Comment: Please provide your pre-redevelopment land cover summary used in the VRRM spreadsheet. You state that approximately 0.44 acres of new impervious cover is being generated by this project. When I make that adjustment to determine your pre-development land cover, assuming the 0.44 acres are currently managed turf, I find a larger required reduction than you are showing in your site data summary. Response: The pre and post-development land cover summaries are provided on Drawing Number C-18 and is coordinated with the information shown on the VRRM spreadsheets. 2. Comment: Table 2.2 of the Virginia DEQ Stormwater Design Specification No. 2 states that the maximum lengths for sheet flow form adjacent pervious and impervious areas to conserved open space are 150 feet and 75 feet, respectively. Your flow length exceed this, please address. Response: A gravel diaphragm has been added to all areas as needed to meet the DEQ requirements as specified in table 2.2 for greater lengths of sheet flow. The detail and Note 2 has been added to Drawing Number C-18 3. Comment: Please show proposed topography on the mitigation/SWM plan (C-18)to allow confirmation of drainage areas. Response: Proposed topography has been added to Drawing Number C-18. 4. Comment: Conserved open spaces/mitigation areas are to remain undisturbed (not manicured). Please note this on the plan. Response: Note 1 has been added to the plan on Drawing Number C-18 to reflect this criteria. D. Erosion and Sediment Control Plan (ESCP) 1. Comment: Please reevaluate drainage areas to ST1 and ST2. It appears that areas west of Farmington Drive will drain to these traps. There are even cross-drains emptying from west to east of Farmington Drive. Response: There are three cross drains that are coming from the west of Farmington Drive. The cross drain pipes have been permanently re-routed to allow the small amount of stormwater flow to be diverted around the construction activity. The new stormwater pipes have been sized to accept the 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 • Fax(434) 978-1 /I1 Charlottesville •Lynchburg Page 2 of 4 Nue flow from the maximum drainage area in the event that stormwater is diverted to this system in the future. Computations are provided on Drawing No. C-17. 2. Comment: There is inconsistency in your silt fencing for the proposed cart paths. There are areas where silt fencing appears to be placed appropriately and there are areas where silt fencing is shown on the high side (Ex.: C-7). There are also areas where no silt fencing associated with the proposed cart path is shown (Ex.: C-9). Please clarify where silt fencing is needed and ensure that it is consistent throughout the plans. Additionally, where cart path is being demolished near or in the WPO buffer, silt fence is needed (Ex.: C- 11). Response: The silt fence has been adjusted and notes have been added to Drawing Number C-16 for additional silt fence to be added as necessary. 3. Comment: Golf course feature outlines (fairways, greens, teeboxes, etc.) are not necessary for E&SC review and add undue clutter, making grading hard to follow. Please remove these, if possible. Response: The golf course features have been removed from most of the plan sheets for clarity. 4. Comment: The WPO buffer cannot be utilized as a stockpile area (C-14), please remove. Response: Based on our meeting the location shown provides the least impact for a stockpile location and will be disturbed as part of the renovations. 5. Comment: Please explain the diversion dike on C-15. It seems that this would only impede sheet flow, creating concentrated flow. It is it to reduce the drainage area, avoiding a sediment trap? Sediment traps are need here, please provide. Sediment traps are also needed at the base of the grading on sheets C-10, C-11, C-13. Sediment traps may also be needed in other areas. Silt fence drainage areas cannot exceed I/4 acre per 100 linear feet of silt fence with a maximum slope length of 100 feet. If used in minor swales and ditches, the maximum drainage area cannot exceed 1 acre [VESCH 3.05]. Please provide alternative E&SC measures where this is the case. Response: The diversion dike is shown so that the contractor will keep as much of the water that is coming from the adjacent property off of the disturbed area during construction. A temporary slope drain has been added as well to improve upon this function. In addition, we have added silt fence with"Mud Traps" (see detail on Drawing No. C-17). 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434) 978-1444 Charlottesville ■Lynchburg Page 3 of 4 E. Mitigation Plan 1. Comment: Typically, required WPO buffer mitigation is 200% (2:1). You are stating that only 20% is required due to the buffer already being in a managed turf state. Please elaborate this rational. More mitigation is likely required, if feasible. Response: Based on our meeting with you and the Program Authority, Glenn Brooks, P.E., the County will accept the 20% ratio discussed. We are however providing well over that ratio. We trust that the above responses and plan changes properly address the outstanding comments. If you have any questions, please contact me. Sincerely, WW Associates, Inc. ////:/' ,11/1 / Rob Umberger Project Manager 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 • Fax(434) 978-1444 Charlottesville •Lynchburg Page 4 of 4 ENGINEERS SURVEYORS PLANNERS ASSOCIATES August 9, 2015 Justin Deel, Engineer II County of Albemarle Department of Community Development 401 McIntire Road, Room 227 Charlottesville, VA 22902 Re: Farmington Country Club—East Nine Improvements VSMP and Mitigation Plan WPO 2015-00030 WWA Project No. 214045.05 Dear Mr. Deel: This letter is to document and respond to your review comments dated August 25, 2015. Our responses are as follows: 1. Comment: Concerning the proposed pipe and fill of the stream on sheet C-9; the Water Protection Ordinance does not allow for the removal of protected streams. An alternative approach will need to be provided here. (Rev. 1)Comment partially addressed. This area is still being shown as an area of buffer disturbance on sheet C-9. Response: The area of buffer disturbance has been removed adjacent to this area. A. Stormwater Pollution Prevention Plan (SWPPP) 1. Comment: Not found. Please provide a SWPPP addressing all items in County Code Section 17-405, using the standard template from the County website. (Rev. 1) Comment Addressed. SWPPP provided. Revision 1 Comments 2. Comment: An operator must be named, and must sign the certification statement and applications. If there is no designated contractor or project manager,it should be the owner of the property. 3040 Avemore Square Place •Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434)978-1444 Charlottesville •Lynchburg Nowire Response: Farmington Country Club has been named by the operator. A copy of the signed certification is included. 3. Comment: SWPPP must be updated to include any and all changes requested below. This can be submitted with the final plans once they are ready for approval. Response: The SWPPP has been updated. B. Pollution Prevention Plan (PPP) 1. Comment: Not found. Please provide a PPP addressing all items in County Code Section 17-404. (Rev. 1) Comment Addressed. PPP provided. C. Stormwater Management Plan (SWMP) 1. Comment: Please provide your pre-redevelopment land cover summary used in the VRRM spreadsheet. You state that approximately 0.44 acres of new impervious cover is being generated by this project. When I make that adjustment to determine your pre-development land cover, assuming the 0.44 acres are currently managed turf, I find a larger required reduction than you are showing in your site data summary. (Rev. 1) Comment partially addressed. It should be noted that your phosphorous load reduction requirement has more than doubled with this submission. That said, Specification No. 1 (Rooftop Disconnection)cannot be used to account for this increase in load reduction requirement. "Two kinds of disconnection are allowed: (1) simple disconnection, whereby rooftops and/or on-lot residential impervious surfaces are directed to pervious areas, and (2) disconnection leading to an alternative runoff reduction practice(s) adjacent to the roof', DEQ Specification No. 1. I do not feel that this BMP is applicable. Response: Based on our meeting, the areas of disturbance for the BMP Analysis have been reduced and some areas have been moved to areas of maintenance only. 2. Comment: Table 2.2 of the Virginia DEQ Stormwater Design Specification No. 2 states that the maximum lengths for sheet flow form adjacent pervious and impervious areas to conserved open space are 150 feet and 75 feet, respectively. Your flow length exceed this,please address. (Rev. 1)Comment partially addressed. Where will the proposed gravel diaphragms be placed and to what extent? Please show this on plans. Response: The gravel diaphragms are shown on the plan. 3040 Avemore Square Place •Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434)978-1444 Charlottesville ■Lynchburg Page 2 of 5 Nair 3. Comment: Please show proposed topography on the mitigation/SWM plan (C-18) to allow confirmation of drainage areas. (Rev. 1) Comment addressed. 4. Comment: Conserved open spaces/mitigation areas are to remain undisturbed (not manicured). Please note this on the plan. (Rev. 1) Comment not addressed. The added note "conserved open spaces/mitigation areas shall remain in a forested condition. (not more than 4 times a year)" is not in accordance with the Albemarle County Water Protection Ordinance. Please see Section 17-601 Management of a Stream Buffer. "Each stream buffer shall be maintained in as natural a condition as possible." This does not include mowing,even once per year. Response: The stream buffer areas have been designated separately from the forested areas used for stormwater management. Revision 1 Comment 5. Comment: Based on the attached DEQ Guidance Memo No. 15-2003 concerning linear projects, I feel that it is reasonable to exclude the added impervious cover due to the additional cart path (0.45 acres) from your load reduction requirement. Response: The additional cart path area has been removed from the calculation. D. Erosion and Sediment Control Plan (ESCP) 1. Comment: Please reevaluate drainage areas to ST1 and ST2. It appears that areas west of Farmington Drive will drain to these traps. There are even cross-drains emptying from west to east of Farmington Drive. (Rev. 1) Comment not addressed. The rerouting of the cross-drains to divert stormwater around the construction activity has not been completed. This activity should be included as part of this plan if it is to be conducted as part of the project. Response: These pipes are included as a part of this project. 2. Comment: There is inconsistency in your silt fencing for the proposed cart paths. There are areas where silt fencing appears to be placed appropriately and there are areas where silt fencing is shown on the high side (Ex.: C-7). There are also areas where no silt fencing associated with the proposed cart 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434) 978-1444 Charlottesville■Lynchburg Page 3 of 5 path is shown (Ex.: C-9). Please clarify where silt fencing is needed and ensure that it is consistent throughout the plans. Additionally, where cart path is being demolished near or in the WPO buffer, silt fence is needed (Ex.: C- 11). (Rev. 1) Comment addressed. 3. Comment: Golf course feature outlines (fairways, greens, teeboxes, etc.) are not necessary for E&SC review and add undue clutter, making grading hard to follow. Please remove these, if possible. (Rev. 1) Comment addressed. 4. Comment: The WPO buffer cannot be utilized as a stockpile area (C-14), please remove. (Rev. 1) Comment addressed. 5. Comment: Please explain the diversion dike on C-15. It seems that this would only impede sheet flow, creating concentrated flow. It is it to reduce the drainage area, avoiding a sediment trap? Sediment traps are need here, please provide. Sediment traps are also needed at the base of the grading on sheets C-10, C-11, C-13. Sediment traps may also be needed in other areas. Silt fence drainage areas cannot exceed 1/4 acre per 100 linear feet of silt fence with a maximum slope length of 100 feet. If used in minor swales and ditches, the maximum drainage area cannot exceed 1 acre [VESCH 3.05]. Please provide alternative E&SC measures where this is the case. (Rev. 1) Comment partially addressed. Mudtraps requires variance requests and fees ($150 each). The request should be made in writing to the County Engineer, specifying each proposed mudtrap location and reason. See Section 17-407. Response: A variance letter has been included with this submission. E. Mitigation Plan 1. Comment: Typically, required WPO buffer mitigation is 200% (2:1). You are stating that only 20% is required due to the buffer already being in a managed turf state. Please elaborate this rational. More mitigation is likely required, if feasible. (Rev. 1) Comment addressed. 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434) 978-1444 Charlottesville •Lynchburg Page 4 of 5 Revision 1 Comment 2. Comment: Three of the four buffer planting options shown on Sheet 19 do not appear to comply with the Water Protection Ordinance. "The preferred vegetative cover in a stream buffer shall be a native riparian forest with ground cover, shrub, and tree canopy layers"(Section 17-601(A)). Only "Option 1"of your proposed buffer planting options would meet this requirement. Please address. Response: The unacceptable options have been removed from the plan. We trust that the above responses and plan changes properly address the outstanding comments. If you have any questions,please contact me. Sincerely, WW Associates, Inc. ///1.7/ Rob Umberger Project Manager 3040 Avemore Square Place •Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434) 978-1444 ...__._....__._-- Charlottesville ■Lynchburg Page 5 of 5 W A ENGINEERS SURVEYORS PLANNERS ASSOCIATES September 24, 2015 Justin Deel, Engineer II County of Albemarle Department of Community Development 401 McIntire Road, Room 227 Charlottesville, VA 22902 Re: Farmington Country Club—East Nine Improvements VSMP and Mitigation Plans WPO 2015-00030 WWA Project No. 214045.05 Dear Mr. Deel: This letter is to document and respond to your review comments dated September 21, 2015. Our responses are as follows: 1. Comment: Your BMP analysis area should reflect your land disturbance area. The 10+acres that you are claiming are undisturbed should not be included in your limits of disturbance. Please revise your limits of disturbance or your BMP analysis area. Response: The limits of disturbance have been adjusted. 2. Comment: Please update the site data information on Sheet 18. Response: The site data has been updated. 3. Comment: Please provide 2 copies of the SWPPP, which needs to be updated with the revised plans and provided signature sheets. Response: Two updated copies of the SWPPP have been provided with this submission. 3040 Avemore Square Place • Charlottesville,VA 22911 Telephone(434) 984-2700 • Fax(434) 978-1444 Charlottesville •Lynchburg lure "%IS We trust that the above responses and plan changes properly address the outstanding comments. If you have any questions, please contact me. Sincerely, WW Associates, Inc. Rob Umberger Project Manager 3040 Avemore Square Place •Charlottesville,VA 22911 Telephone(434) 984-2700 •Fax(434) 978-1444 Charlottesville •Lynchburg Page 2 of 2 orroe ',moil W.ifA ENGINEERS idSURVEYORS PLANNERS ASSOCIATES September 10, 2015 Mr. Glenn Brooks,P.E. County Engineer County of Albemarle Department of Community Development 401 McIntire Road Charlottesville,Virginia 22902 Re: Farmington Country Club—East Nine Improvements WPO 2015-00030 WWA Project No. 214045.05 Dear Mr. Brooks: In conjunction with the submission of the above-referenced project,we request on behalf of the applicant, a variance to permit the installation of"mud traps" in areas where other Erosion and Sediment Control trapping measures (i.e., sediment traps) would result in increased land disturbance. As proposed, the areas of land disturbance are confined to the golf course areas that are being redesigned/regraded. The use of"mud traps"is integral with the perimeter controls and are less invasive then installing silt traps. Installation of silt traps require substantial grading as well as generate additional disturbed areas. The proposed "mud traps" are the same as approved for use in Albemarle County approved plan WPO-2012-00091 Keswick Country Club. Please note that "mud traps" are similar to "gravel outlets" as permitted by the Thomas Jefferson Water and Soil Conservation District for use in Louisa County. The Applicant respectfully requests this variance to facilitate construction of these golf course design/grading improvements and that the disturbed site areas will be properly contained via"mud traps"to preclude erosion and sediment transport. Sincerely, WW Associates, Inc. alitimimidaam_ David M Jensen, P.E. Vice President