The URL can be used to link to this page

Home My WebLink AboutWPO202200027 Correspondence 2022-12-20•��01 0 608 Preston Avenue P 434.295.5624 Suite 200 F 434.295.1800 T I M M O N S GROUP Charlottesville, VA 22903 www.timmons.com December 19, 2022 John Anderson County of Albemarle Neighborhood Development 401 McIntire Rd, North Wing Charlottesville, VA 22902 RE: Towneplace Inn & Suites — VSMP Plan Review - Comment Response Letter Dear Mr. Anderson: We have reviewed all of your comments from August 12, 2022 and made the necessary revisions. Please find our responses to the comments below in bold lettering. County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is denied for reasons listed below. The VSMP application content requirements can be found in County Code section 17-401. 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. SWPPP 1. Please ensure SWPPP cover includes reference to WP02022-00027. The SWPPP cover now includes reference to WP02022-00027 2. Complete SWPPP, Sec. 1, Registration Statement (ensure section V. is signed /dated). The registration statement has been completed with a signature and date. See sheet 6 of the SWPPP. 3. SWPPP, Sec. 6.A., PPP Exhibit. a. Revise Phase I Exhibit to include: vehicle wheel wash station (ensure vehicle wash waters drain to depression /collection (shown on plan sheet C3.3,), wash waters may not drain to storm conveyance); rain gauge; on -site fueling station with impermeable liner capable of containing (stored fuel volume + 10-yr storm event) x 1.1 (FS) if on -site refueling anticipated. ENGINEERING I DESIGN I TECHNOLOGY The PPP phase I exhibit has been revised to include a vehicle wash rack along with a sediment trap/ local depression for vehicle wash water runoff. A rain gauge and on -site fueling station has been provided to the PPP phase I exhibit as well. See PPP phase I exhibit. b. Revise Phase II Exhibit to include items mentioned at 3.a., as needed. The PPP phase II exhibit has been revised to include the items mentioned in comment 3a as needed. This includes the rain gauge and fueling station. See PPP phase II exhibit. c. Recommend Phase III Exhibit include rain gauge. The PPP phase III exhibit has been revised to include a rain gauge. See PPP phase III exhibit. 4. WPPP Sec. 6E: Prior to requesting pre -construction, list named individual responsible for PPP practices. Not required for VSMP /WPO plan approval. Acknowledged and when a contractor is selected the individual will be named and update provided to the county prior to permit issuance. 5. Sec. 8: Prior to pre -construction, provide the name, tel. number and qualifications of the qualified personnel conducting SWPPP compliance inspections. Not required for WPO plan approval. Acknowledged and when a contractor is selected the individual will be named and update provided to the county prior to permit issuance. B. Pollution Prevention Plan (PPP) —see SWPPP items 3, 4, above The PPP content requirements can be found in County Code section 17-404. Acknowledged. 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. 1. Revise plan title to include ref. to WPO2022-00027. The plan title has been revised to include a reference to WPO2022-00027 2. Calculation packet, p. 3 of PDF. Revise SWM Narrative to provide reference to W PO200600075. The SWM narrative has been revised to provide reference to WPO200600075 3. C0.0: Please list associated plans: WPO200600075, WPO200700078 SWM Plan Amendment, SUB200700078 Final Subdivision Plat, SUB200700078 ROAD Plan As -built. The above associated plans have been listed on the cover sheet, sheet C0.0. 4. Please rotate /orient sheet C4.1 to landscape view. Sheet C4.1 has been oriented to landscape view. 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 disapproved for reasons listed, below. The erosion control plan content requirements can be found in County Code section 17-402. 1. C3.2: a. ST controlling runoff from 2.1 Ac. may not discharge via weir to silt fence to Olympia Drive DI; rather, revise to provide ST relief via pipe connection with Olympia Drive DI. Current design allows no relief, and with more intense rain events an increasing possibility, any incident or activation of sediment trap weir with current design nearly assures sediment -laden discharge to Olympia Drive. An elevated (temporary) storm drain grate /DI in floor of trap with SF protection (for grate) is an option. [ VESCH Plate 3.07-1] The temporary sediment trap has been converted into a pipe outlet sediment trap to provide ST relief via pipe connection to the Olympia Drive drop inlet structure. This pipe outlet sediment trap utilizes a perforated corrugated metal riser structure and is detailed on sheets C3.0 and C3.2. b. Sediment trap floor elevation ( =410' ) appears inconsistent with trap design table, C3.1. Please check, revise as needed. The sediment trap floor elevation has been revised to 409'. This elevation has been updated to be consistent throughout the plans. See sheets C3.0 and C3.2. 2. C3.4 3. Provide Phase 3 trap North of Olympia Drive (off -site) since on -site trap /perimeter measures vanish as site is built out. It is imperative that design provide temporary off - site ESC measure to protect off -site biofilter to which project routes runoff (to capture sediment -laden runoff as on -site trap is reduced in size, then removed, as improvements are constructed while site is actively disturbed, as site transitions to a nearly fully impervious condition at NW corner of site where trap is located in ESC phase 1 and 2). Off -site ESC requires adjacent property owner be party to ESC plan bond, as well as an off -site temporary construction easement or written agreement allowing Pantops Hotel LLC temporary construction access and county staff inspection access. Revisions have been made to the erosion and sediment control plans to ensure sediment runoff is captured as the sediment trap reduces in size, transitioning the site to its final impervious condition. E&SC Phase II now represents the final condition before the sediment trap can be completely removed. The entire proposed storm system will be installed with inlet protection during E&SC Phase 11, allowing the pipe outlet sediment trap from phase I to transition into an excavated drop inlet sediment trap with a temporary grate top in E&SC Phase II. Furthermore, once all inlet protection has been installed and the entire site upstream of the phase II excavated DI sediment trap has been stabilized with seeding, the excavated DI sediment trap will no longer be needed. E&SC Phase III can then begin in which the trap is fully removed. See Sheets C3.0-C3.4 for E&SC plans and sequence of installation. This additional sequencing to control progress of the contractor and further detailing of the transition of the on -site measures will provide adequate E&S controls without warrant for downstream measures off site. Process: Stormwater Management Facilities Maintenance Agreement may require update to clarify TMP 78-9D owner shared existing SWM Facility Maintenance responsibility for existing biofilter located north of Olympia Drive (Certificate of Plat at bk.-pg. 3657-564/SWM easement at pg. 575). Albemarle County Attorney's Office will advise whether a new SWM facility maintenance agreement is required (which would ref. WPO2022-00027). Engineering will provide update. If new agreement is required, County's Management Analyst or other staff will prepare the forms and check for ownership and signature information. The completed forms will have to be submitted along with court recording fees. Understood and this maintenance obligation has been discussed with the owner which they were aware of and believe there was already a maintenance obligation for the property as it drains to the downstream practice in the existing condition. Once the County Attorney's office has rendered an opinion regarding if the existing SWM maintenance agreement will suffice or if a new one is necessary please provide direction we may then share with the owner for next steps if necessary. We have included PDF copies of the plans and calculations for your review. If you have any questions or comments, please feel free to give me a call at 434.295.5624 or email bryan.cichocki@timmons.com . Sincerely, Bryan Cichocki, PE Project Manager