Loading...
HomeMy WebLinkAboutWPO201900062 Correspondence 2022-02-1530 Scale, LLC 871 Justin Drive, Palmyra, VA 22963 Ph. 434.242.2866 mike(a)30scale.com E E R I N G February 9, 2022 Mr. Matthew Wentland Department of Community Development 401 McIntire Road Charlottesville, VA 22902 RE. Southwood— Phase 1 - Clean Earth Fill Plan — North Area WPO 2019-00062 Amendment TM 90A1-1D - Albemarle County, Virginia Dear Matt, To accompany our electronic resubmission of the referenced WPO plan and H&H Computations, the below describes how we have addressed your comments dated January 25, 2022: A. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Will the existing DEQ permit be used to cover this area? If so, please provide a completed and signed DEQ Registration Statement modification if the area increased from the original permit, or a new Registration Statement if not. 2. The existing Village 1 SWPPP will need to be updated once this plan is approved or a separate SWPPP provided. RESPONSE: The existing DEQ permit will be used to cover the additional 1.01 acres of disturbed area. The signed DEQ Registration Statement modification will be forwarded to you under separate cover and will be added to the SWPPP in the field once the plan is approved. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. The existing Village 1 PPP will need to be updated once this plan is approved. RESPONSE: Acknowledged. The existing Village 1 PPP will be updated once the plan is approved. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17- 403. 1. This plan cannot be approved until the 0.43 Ib/yr of nutrient credits have been purchased. Please contact Ana Kilmer prior to purchasing credits. Since this project drains to impacted streams, the credits will need to be purchased from the Ivy Creek or Rivanna River credit banks, since they are located in the same HUC8. [9VAC25-900-91.13] ENGINEERING RESPONSE: Acknowledged. With the 2nd Submission, only 0.11 Ib/yr of nutrient credits need to be purchased to comply with the water quality requirement. The credits were reduced since the site area was updated from 2.33 acres to 1.01 acres to reflect only the disturbed area. The extra 1.32 acres includes offsite area that flows through the project. The Water Quality Phosphorus Project Tracking Spreadsheet for Phase 1 has been updated accordingly on the Cover Sheet of the plans. 2. A SWM maintenance agreement will be required. Please contact Ana Kilmer to begin this process. RESPONSE: Acknowledged. The applicant is pursuing the SWM maintenance agreement with Ana Kilmer. 3. Land used as Forest and Open Space in the VRRM (post -development) will need to be protected by an easement and cannot be disturbed during construction. Show this area on the plans. Forest and Open Space will require a plat and deed. RESPONSE: VRRM (post development) has been updated to zero out the Forest and Open Space areas The maintenance access to the pond should not exceed 15% slope and will need to provide access to the riser structure. [DEQ BMP Specs.] RESPONSE: The maintenance access road has been revised and a profile added to Sheet 5 indicating a maximum 15% slope. The road allows for adequate access to the pond riser structure. Applicable ditch calculations have been added to the H&H booklet. 5. Remove 'private' from the SWM easement label. A plat and deed will be required for the SWM easement. RESPONSE: The word `private' has been removed from the SWM easement label. The applicant will submit a plat and deed under separate cover. However, the applicant will also respectfully appeal to Jody Filardo to request that fill operations be allowed to commence in accordance with the plans and that the plat recordation be a condition of bond release. 6. Since the pond is being used for water quality, provide details on how it meets the design requirements in DEQ BMP Spec. 15. This includes the pretreatment requirements in section 6.4. RESPONSE: A forebay has been added. Also, a narrative has been added to Sheet 10 indicating how the ED Pond complies with Specification 15. 21 ENGINEERING 7. Provide a landscaping plan per Spec. 15 section 6.7. RESPONSE: A landscaping plan has been added to Sheet 11. However, please note that the only landscaping requirement for an ED Pond Level One is to provide turf cover of the floor. A narrative addressing this has also been added to Sheet 11. S. The maximum side slopes allowed by the County inside a basin is 3:1. RESPONSE: All slopes have been revised to be 3:1 or greater. 9. The height of the fill is not to exceed 8' above natural grade, which is the existing grade. 10. Show more detail on the swale that is being created next to Mobile Home #780. It appears that the fill is encroaching onto the corner of the home and past the limits of disturbance. Ensure all runoff is directed away from the home. RESPONSE: The grading for the project has been revised to avoid cutting over the existing sanitary sewer line below Mobile Home #780. As a result, the swale has been removed. Please also note that we re -surveyed the sewer line to confirm that the line runs to the cleanout behind Mobile Home #786 11. Show existing utilities on the profiles. RESPONSE: All known existing utilities and proposed utility crossings have been added to the construction profiles. 12. The sanitary sewer will need to be outside of the SWIM pond. There is also over 10' of cut proposed over the sanitary line and does not appear feasible. RESPONSE: The grading for the project has been revised to avoid cutting over the existing sanitary sewer line below Mobile Home #780. Please also note that we re -surveyed the sewer lines to confirm that the line runs to the cleanout behind Mobile Home #786. The sewer on the north side of the gully was also re -surveyed and the location has been updated. In any event, there is no cut on the north side of the gully. 13. The plan is currently under Zoning review and may generate additional comments. RESPONSE: Since the last submission, it has been determined that the clean earth fill use can be permitted by means of a Letter of Revision to Village 1. The LOR will be submitted under separate cover. 31 ENGINEERING D. Erosion and Sediment Control Plan (ESCP) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. 1. The ESC plan appears acceptable at this time. RESPONSE: Acknowledged. Based on the revised grading and limits of disturbance, the ESC plan has been updated accordingly. We thank you for your time to review this request. Please contact me if you have any questions or require additional information to complete your review. Sincerely, CFM Cc: Mr. Andrew Vinisky, Habitat for Humanity of Greater Charlottesville Mr. William Thiessen, Habitat for Humanity of Greater Charlottesville Mr. Bryan Rieckmann, P.E., Faulconer Construction Company Mr. Bryan Cichoki, P.E., Timmons Group Mr. Clint Shifttett, P.E., Timmons Group 4 1 P a g e