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HomeMy WebLinkAboutWPO202200009 Review Comments WPO VSMP 2022-06-22�q oe atg 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 County of Albemarle Telephone:434-296-5832 m COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG VSMP Permit Plan Review Project title: Mountain View Elementary School Project file number: WP0202200009 Plan preparer: Craig Kotarski [craig.kotarski@timmons.com] Owner or rep.: Sheila Hoopmann [shoopmann@kl2albemarle.org] Plan received date: March 14, 2022 May 20, 2022 Date of comments: April 20, 2022 June 22, 2022 (Rev.1) Reviewer: David James [djames2@albemarle.org] 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/approved. The rationale is given in the comments 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. 1. Submit a SWPPP. Template - https://www.albemarle.org/government/community- development/apply-for/engineering-applications/vsmp (Rev.1) Addressed. 2. (Rev.1) Include WPO# and project name on SWPPP cover. 3. (Rev.1) Complete & sign Registration Statement a. Sec. III. -Change: The 6' order HUC is JR15 or 02O8O2O4O4O2 and downstream receiving water is Cow Branch. 4. (Rev.1) Sec. 4 & 5 - Update with the approved versions. 5. (Rev.1) Sec. 8 - Complete prior to preconstruction meeting. 6. (Rev.1) Sec. 9 - Complete prior to approval. 7. (Rev.1) Sec. 10 - Complete prior to preconstruction meeting. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. Provide a PPP for review. (Rev.1) Addressed. 2. (Rev.1) Provide a detail of the concrete washout, mortar mixing station, and fuel station. Namely of the containment area that could be site specific. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is denied, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17- 403. Engineering Review Comments Page 2 of 4 1. Sheet 6.2: a. Verify/Correct diameter - 48" versus 6' per details. b. Provide secured trash rack over orifices. (Rev.1) Acknowledged; You can add a note/callout in the detail to provide for trashrack over weir plate orifices. 2. Sheet 7.1: a. Revise: The height of cover over detention pipe system shall be 2' or % diameter whichever is greater. (Rev.1) Partially addressed. Please provide the necessary cover for the 5' diameter pipes. b. Show HGL. (Rev.1) Addressed. c. Provide profile of detention pipe system: Show invert, slope, size, length, material, weir, access. I. Provide maintenance access above weir. ii. Provide access ladder & detail. (Rev.1) Acknowledged; Not currently addressed. d. (Rev.1) Verify/Correct structure labeling (highlighted): ' i mOm©GOD 3. Provide water -tight fitting where pipes of dissimilar materials connect. (Rev.1) Addressed. 4. Sheet 5.2, etc.: Show MH accesses above weir plate locations for the CMP detentions. (Rev.1) Please show MH access in the profiles. Include maintenance access ladder and detail. 5. Provide trash rack secured to spillway barrel of det. pond. (Rev.1) Addressed. 6. Provide additional MH access (every 50' of length) for storm pipes 307, 317, 319, 418. Alternatively, additional MH access not required if pipe size is 15". (Rev.1) Addressed. a. (Rev.1) Provide 15" for pipe 323, as well. i. (Rev.1) Provide pipe anchor blocks (every other pipe joint at a minimum, >16%). 7. Sheet 6.4: Nutrient bank availability: The first assessed waterway downstream of the LDA with an impairment is Cows Branch, as shown on the DEQ NPS Nutrient Trading Dataviewer. According to the hierarchy credits should be purchased within the same 8- digit HUC (02080204). It appears that there are two banks available, The Rivanna River 3. Provide water -tight fitting where pipes of dissimilar materials connect. (Rev.1) Addressed. 4. Sheet 5.2, etc.: Show MH accesses above weir plate locations for the CMP detentions. (Rev.1) Please show MH access in the profiles. Include maintenance access ladder and detail. 5. Provide trash rack secured to spillway barrel of det. pond. (Rev.1) Addressed. 6. Provide additional MH access (every 50' of length) for storm pipes 307, 317, 319, 418. Alternatively, additional MH access not required if pipe size is 15". (Rev.1) Addressed. a. (Rev.1) Provide 15" for pipe 323, as well. i. (Rev.1) Provide pipe anchor blocks (every other pipe joint at a minimum, >16%). 7. Sheet 6.4: Nutrient bank availability: The first assessed waterway downstream of the LDA with an impairment is Cows Branch, as shown on the DEQ NPS Nutrient Trading Dataviewer. According to the hierarchy credits should be purchased within the same 8- digit HUC (02080204). It appears that there are two banks available, The Rivanna River Engineering Review Comments Page 3 of 4 NPS bank and Ivy Creek NPS bank to purchase from. (Rev.1) Addressed. 8. Hydro Calcs - Please provide Post Dev summary sheets like the Pre Dev (on pages 10, 22, 34) given. Verify total DA match Pre -/Post-. (Rev.1) Addressed. 9. (Rev.1) Please provide any manufacture specific installation & long-term maintenance requirements for the UD system. 10. (Rev.1) Please contact Ana Kilmer (akilmer@albemarle.or¢) prior to nutrient credit purchase. Purchase needed prior to permit issuance. -Currently, 1.98/b/yr TPare needed Note: SWM plan amends WP0200600002. 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, 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. Cover: a. Add WPO# under title. b. Signature panel can be removed. (Rev.1) Addressed. 2. Sheet 2.1/2.2: Show footprint and label existing BMP/SWM facilities. (Rev.1) Addressed. 3. Sheet 2.4/2.5: Show label for the removal of the bioretention facility and SWM pond. Add note ...'as shown on WP0200600002'. (Rev.1) Addressed. 4. Sheet 3.2/3.3: a. Revise construction entrance (CE). Centrally place or provide additional construction entrance. There's grading shown not just at the current CE location. If trucks are hauling earth, then there should be connected paths between areas shown to get to the CE. (Rev.1) Addressed. b. Show sediment trapping device location at CE. (Rev.1) Addressed. c. Show staging area, stockpile area (protected with silt fence). (Rev.1) Addressed. 5. Sheet 3.3: a. Show SB symbol. SB still in place for ph.ii until upstream area is fully stabilized. (Rev.1) Addressed. b. Show IP symbol at curb cuts and OP symbol at basin. (Rev.1) Acknowledged; the OP is shown from end of 15" pipe into basin. c. Grading over 2:1 here. Revise to be 2:1 or flatter. (Rev.1) N/A; Acknowledged. d. Provide type of low -maintenance ground cover (not grass) for slopes over 3:1. (Rev.1) Addressed. The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re -submittals please provide 2 copies of the complete permit package with a completed application form. Engineering plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Engineering Review Comments Page 4 of 4 Process: .. .. ...... .... ..... .. ■_. ..._. ■ After bonding and agreements are complete, county staff enters project information in a DEQ database for state application processing, if a DEQ permit is required. DEQ reviews the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter, which must be posted at the construction site. After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants must complete the request for a pre -construction conference form and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid. This will be checked by county staff, and upon approval, a pre -construction conference will be scheduled with the County inspector. At the pre - construction conference, should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; https://www.albemarle.org/govern ment/community-development/apply-for/engineeri ng-applications