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Home My WebLink AboutWPO202100058 Correspondence 2022-07-05BOHLERI County of Albemarle Community Development Department 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 Attn: John Anderson Dear Mr. Anderson: 9100 Arboretum Parkway, Suite 360 Richmond, VA 23236 804.893.8200 July 5, 2022 Via Upload Re: WPO2021-00058 VSMP Plan 2nd Review Response RST Residencies Seminole Trail and Ashwood Blvd Charlottesville, VA 22911 Albemarle County V192076 Bohler is pleased to submit on behalf of RST Development, LLC, the revised VSMP Permit Plan Review 3rd Submission for the RST Residencies. The following is our comment response letter addressing comments received from County of Albemarle's Community Development Department dated June 17, 2022. Each comment is addressed and responded to as follows: Community Development Department / John Anderson: A. Stormwater Pollution Prevention Plan (SWPPP) Comment 1: SWPPP: (Rev. 1) May persist. Please email reviewer .PDF of SWPPP (or provide link) since SWPPP is not listed with 4 documents submitted 18-May 2022. Qanderson2@albemarle.org) a. Sec. 6.A. / PPP Exhibit: Indicate initial location of rain gauge and non- hazardous solid waste disposal (dumpster). b. Sec. 6.E.: List names individual responsible for PPP, prior to preconstruction as prerequisite to receiving a Grading Permit. Not required for WPO plan approval. c. Sec. 8: List names individual responsible for ESC compliance inspections prior to preconstruction as prerequisite to receiving a Grading Permit. Not required for WPO plan approval. Response 1: The SWPPP has been included in this submittal and emailed to reviewer. a. Rain gage and dumpster are shown on sheet C-602 b. Alex Mays has been listed in section 6.E. c. Alex Mays has been listed in section 8. w .BohlerEngineering.com BOHLERI John Anderson VSMP Permit Plan 2nd Review Response July 5, 2022 Page 2 of 4 B. Pollution Prevention Plan (PPP) — see SWPPP item 1.a., above (Rev. 1) May persist. The PPP content requirements can be found in County Code section 17-404. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved for reasons listed below. The stormwater management plan content requirements can be found in County Code section 17-403. Comment 1: Note: Plan proposes 4.23 lb. nutrient credit purchase (24.6% of TP phosphorus reduction required). Please coordinate purchase with Ana Kilmer at 434.296-5832 -x3246 prior to finalizing Affidavit and bill of sale, as specific project -related information must display on Affidavit and bill of sale. Purchase is not required for plan approval but is prerequisite to receiving a Grading Permit. (Rev. 1) Persists. Applicant response (letter d. May 18, 2022): 'Comment acknowledged.' Response 1: Comment acknowledged. We will contact Ana Kilmer prior to finalizing Affidavit and bill of sale. Comment 4: Coordinate slopes shown by field survey to be less than 25 percent (not steep therefore eligible for development) with Engineering. Currently -mapped preserved steep slopes are shown graded, or with improvements. Neither grading nor improvements are permissible on preserved steep slopes. A Steep Slopes Exhibit with discrete survey data showing portions of currently -mapped steep slopes proposed to be graded or otherwise developed are < 25%, is required, prior to WPO plan approval of proposed grading, or improvements depicted across preserved steep slopes. Please coordinate with Engineering. (Rev. 1) Addressed. Submittal includes Slope Percentage Exhibit (by Eric K. Niskanen, VATS, d. 3/9/22; field survey performed 12/23/20) that indicates specific areas are eligible for uses permitted in the underlying district since topographic information that is more accurate indicates slopes <25% exist in these specific areas. As follow-up, please: a. Revise exhibit to include text reference SDP202200002, and WPO202100058. b. Estimate /report area (ff^2) of preserved steep slopes field -surveyed to be <25% (eligible for uses permitted in underlying district). c. Show areas of preserved slopes field -surveyed <25% across plan sheets (shown on C-605, but not C-610, C-615), including ESC series and existing conditions sheets. Recommend provide slope legend if preserved slopes <25% are shaded red. d. Direct reviewer to existing conditions sheet (sheet #), or restore existing conditions sheet I inadvertently removed from WPO plan set. On existing conditions sheet, please indicate /show: i. Existing access easement/s, public RW (Ashwood, U.S. Rt. 29), utility easements, etc. Provide deed bk.-pg. ref. for existing easements, public RW, similar to information shown on FSP, SDP202200002 plan sheets. ii. Preserved slopes field -surveyed <25% (12/23/20 survey). iii. Preserved slopes. iv. Managed slopes. w .BohlerEngineering.com John Anderson BOHLERI VSMP Permit Plan 2nd Review Response July 5, 2022 Page 3 of 4 V. Existing contour labels. vi. Parcel information, to be developed, and adjacent parcels: 1. Owner 2. Tax map parcel 3. Deed bk.-pg. ref. vii. Features proposed to be removed/ demolished. Response 4: a. Slope Percentage Exhibit has been revised. b. Slope Percentage Exhibit has been revised. c. The slope hatches and legend are now showing on all erosion sheets. A reference to the Slope Percentage Exhibit has been added to the cover sheet. d. The Existing and Demolition Sheets C-200 — C-204 have been added to the set and contain the information requested. Comment 5: C-903: b. Provide VDOT LD-229 for existing storm system elements within Rt. 29 NBL RW, and Ashwood Blvd RW. Evaluate current available capacity of inlets and pipes against flow anticipated to occur with RST Residencies development. (Rev. 1) Partially addressed. As follow-up: i. Although B-30 is located at EP of parallel parking (C-503), and not a travel lane, 9.58' spread may pose inconvenience /risk. Engineering recommends slightly longer STM B-30 DI-3C throat length. ii. Ex-F1 to Ex-F2 approaches 100%" capacity of Ex. 18" RCP. Any upset to predicted in-service performance or bypass of proposed on -site UG SWM facility may yield flows that exceed capacity of Ex-F1 to Ex-F2. This instance is referred to VDOT since Ex-F2 is proximate to (or within) Ashwood Blvd. RW. Engineering defers to VDOT on FSP's (WPO's) effect on existing storm elements within public RW, whether U.S. Rt. 29 NBL or Ashwood Blvd. RW (Ex. pipes /inlets). 6/10/22 VDOT response to referral was sent to Bohler Engineering as email, June 10, 2022 11:31 AM; partial text: 'developer needs to upgrade it or redesign the SWM detention system so that it uses less of the pipe's capacity.' Please revise design per 6/10/22 VDOT guidance. Response 5: C-903: W. The B-30 throat length has been updated to 12' and the spread is now less than 7'. Wi. The SWM facility has been updated so that there is less flow through the existing storm pipe which is now at less than 100% capacity during the 10 year storm. See sheet C-903. Comment 7: Please consider / incorporate WPO plan -related Engineering review comments on SDP202100079, Initial Site plan, d. 11/16/21, with revised WPO plan. (Rev. 1) May persist. Applicant: 'Comment acknowledged.' Response 7: Comment acknowledged. All engineering comments have been addressed. w .BohlerEngineering.com BOHLERI John Anderson VSMP Permit Plan 2nd Review Response July 5, 2022 Page 4 of 4 D. Erosion and Sediment Control Plan (ESCP) Comment 5: (Rev. 1) New: a. Provide detail for "Flexstorm catch it' inlet inserts listed at Phase IB sequence of construction Note 5.12, sheet C-605, unless overlooked. Response 5: The flexstorm detail was added to sheet C-617. Should you have any questions regarding this project or require additional information, please do not hesitate to contact me at (804) 893-8200. Sincerely, Bohler Engineering VA, LLC Ryan Yauger, P.E. RY/et \\bohlereng.net\shares\VA-PROJECTS\19\V192076\Administrative\Letters\VSMP\220705 Albemarle Co RST VSMP Permit Plan 2nd Review Response CRL.doc www.BohlerEngineering.com