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HomeMy WebLinkAboutWPO202100035 Plan - VSMP 2021-10-20A. SEH Building a Better World for All of Us° October 19, 2021 Albemarle County 401 McIntire Road Charlottesville, VA 22902 RE: Rivanna Water and Sewer Authority Airport Rd. Pumps Station SEH No. RIVAN 153082 14.00 Enclosed is the second submission for the Virginia Stormwater Management Program (VSMP), WP02021- 00035, Airport Road Pump Station Project. The electronic application submittal includes: • Responses to comments provided on 08/18/2021. • Email sent 10/19/2021 from John Anderson to Maria McCarty on the signatures required for the SWPPP. • Stormwater Pollution Prevention Plan. The Stormwater Pollution Prevention Plan is submitted without the designation of the Operator/Permittee. This information will be completed by the contractor once the project is awarded. It is the intent for the contractor to submit/obtain the grading permit, and at that time, the missing information in the Stormwater Pollution Prevention Plan will be completed. Section 9 of the SWPPP has been signed. If you have any questions with the application, you can reach me at 507.508.4707, or mmccartv(cDsehinc.com. Sincerely, SHORT ELLIOTT HENDRICKSON INC. Maria McCarty Engineer MNT \\sp3020-llprojects\pt\n n\153082\5-fina"sgn\5 mg-appNkounty peimitawpo\0. submitlalsA. submittal 4\responses_wpo202100035_airport road pump station_081821.dom Engineers I Architects I Planners I Scientists Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive, St. Paul, MN 55110-3507 SEH is 100% employee -owned I sehlnc.com 1 651.490.2000 1 800.325.2055 1 888.908.8166 fax �q off nig 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 County of Albemarle Telephone: 434-296-5832 COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG ��BGIN�Q' VSMP Permit Plan Review Project: Airport Road Pump Station Project Project file number: WPO2021-00035 Plan preparer: Brad Weiss, PE, Project Engineer — Short Elliot Hendrickson, Inc. (SEH) bweiss(i�sehinc.com 3535 Vadnais Center Drive, St. Paul, MN 55110 Owner or rep.: Michelle Simpson, PE I msimpson(duivanna.mg ] Rivanna Water and Sewer Authority, 695 Moores Creek Lane Charlottesville, VA 22902 Plan received date: 30 June 2021 (Rev. 1) 17 Sep 2021 Date of comments: 18 Aug 2021 (Rev. 1) 15 Oct 2021 —ESC & SWM plans approved, SWPPP incomplete Reviewer: John Anderson, PE 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 relating to SWPPP only. The VSMP application content requirements can be found in County Code section 17-401. A. Stormwater Pollution Prevention Plan (SWPPP) 1. 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. SWPPP / Ref. p. 134 of 160p. initial plan submittal; request Applicant revise, as follows: (Rev. 1) Persists. Applicant response (9/9/21 letter): `Draft Registration statement with the following sections completed: II, IV, and V. Sections I, III, and IV shall be completed by the contractor after bids are awarded.' a. SWPPP Sec. 1 / Registration Statement: Complete Registration Statement: i. Sec. I/A.,B.,C (Recommend check C. box `yes') ii. List Sec, II.B. Address for locational/navigational purposes as Berkman Drive Ext., North Terminus iii. Complete Sec. IV.B. — Estimated project dates (Rev. 1) Addressed. iv. Complete Sec. VI: Print /sign /date (Rev. 1) Persists. b. SWPPP Secs, 4-5: Update with revised plans (Rev. 1) Addressed. c. SWPPP Sec. 6. i. A. -Exhibit /Please revise to clarify (initial) locations of. (Rev. 1) Partially addressed. As ollow-up: Please indicate initial (design) locations of the following, which site contractor may relocate at their discretion. 1. Rain gauge 2. Solid waste dumpster (if any) 3. Portable sanitary facility (ports John) 4. Paved construction entrance (may not use Berkmar Drive Ext. as PCE) 5. On -site fuel storage (if any) ii. E. -Please name individual responsible for PPP (Rev. 1) Persists. Applicant: `Will be completed by the contractor after bids are awarded.' d. SWPPP Sec. 8 - Please name individual responsible for SWPPP compliance inspections; may be qualified RWSA, SEH, or contractor personnel. Required to receive Grading Permit, but not Engineering Review Comments Page 2 of 7 required for WPO plan approval. (Rev. 1) Persists. Applicant: `Will be completed by the contractor after bids are awarded.' e. SWPPP Sec. 9, Signed Certification: Provide title /sign /date. (Rev. 1) Persists. Discussed briefly 13-Oct with Maria McCarty /SEH. (Rev. 1) Persists. Applicant: `Will be completed by the contractor after bids are awarded.' B. Pollution Prevention Plan (PPP) — See above, Sec. 6. (Rev. 1) Persists. Please see item A.l.c., above. 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 approved. 1. C12,C13 a. Ref Engineering review comments, SDP202100056 (8/4/21), and revise proposed grade accordingly. (Rev. 1) Addressed. b. Add linework to graphically explicitly indicate upslope point where defined Swale begins. (Rev. 1) NA. Applicant: `Swale removed with grading changes for ELS.' c. Label bioretention basin, L x W, in plan view. (Rev. 1) Addressed. Applicant: `Length of ELS noted on plans. Width noted in section.' d. Label length of stone pre-treatment, each end of basin. (Rev. 1) NA. Applicant: `No longer applicable with change to ELS.' e. List ft' media required for bioretention basin construction. [ Recommend number pages of Calculation Packet, and reference relevant pg. in calc. packet.] (Rev. 1) NA. Applicant: `No longer applicable with change to ELS.' f. Revise plan view of basin to show buried stone storage at south end of basin, similar to the way buried stone storage is shown along west edge of basin. (Rev. 1) NA. Applicant: `No longer applicable with change to ELS.' g. Label all basin elevations, including base of 24" storage area, base of fill media, pea gravel, etc. (Rev. 1) NA. Applicant: `Elevations included in section of ELS w/ forebay.' h. Revise `bottom elevation' label to read `top of fill media.' (Rev. 1) NA. Applicant: `No longer applicable with change to ELS.' i. Include Construction Record Drawings (As -built) for VSMP on the plans: https://www.albemarle.org/home/showpublisheddocument/3381/637327510536700000 (Rev. 1) Addressed. Ref sheet C13. j. Include BMP clearinghouse bioretention installation (8.2), construction inspection, first -year maintenance operations (9.2), and maintenance inspections (9.3) information on the plan. (Rev. 1) Addressed. k. Include attached periodic bioretention inspection checklist on the plans. (Rev. 1) Addressed. Applicant: `Periodic inspection checklists for ELS included on drawings.' 1. Indicate locations of 3 trees and 15 shrubs in plan view, identify using planting legend symbols. (Rev. 1) NA. Applicant: `No longer applicable with change to ELS.' 2. Note: A 160-p. composite document was submitted: Application, certification (Miles B. Jensen, VA PE), proprietary document (TOC, Site Description, ESC Plan, SWM Plan, Tables, Appendices). 20-sheet plan comprises last pp. of the document. a. Please divide this document into separate submittals: Application, Calculation Packet (incl. USDA-NRCS soils map, drainage map/s, pre- post -condition, etc.), SWPPP, WPO plan. (Rev. 1) Addressed. b. Additional /specific: i. PG. 9 (of 160-p..PDF): Revise ref. at 3.1.1 to require a paved construction entrance, rather than a temporary stoned construction entrance. See comment/s elsewhere requesting ACDSM paved wash rack detail be placed on plans. (Rev. 1) Addressed. Engineering Review Comments Page 3 of 7 ii. PG. 14: 4.2.2 Ref. to Flood Protection — East discharge to meeting requirements for 9VAC25-870-66.C.2.b. indicates discharge to a (manmade) storm conveyance system that experiences periodic flooding. As discussed 8/17/21 (Weiss -Anderson), it is unclear that proposed east discharge from the bioretention basin is to a manmade system. Please clarify (via narrative, note, graphic linework, labels) that bioretention basin discharge is to an existing manmade storm conveyance system that experiences periodic flooding. (Rev. 1) Addressed. Applicant: `Evaluation of the east drainage area updated to meet 9VAC25-870-66.d with the released peak flow per linear foot for the 10-yr 24-hr event less than the pre -condition, as discussed in 8/31/21 meeting.' Also discussed, Anderson- M. McCarty, 13-Oct. iii. Also, 4.2.2 makes ref. to 2-yr storm event peak discharge of 0.92 cfs, with runoff velocity of 2.86 ft/s. Plan must indicate discharge is to a manmade conveyance system, and is non -erosive, or is to a defined channel (as indicated by field -run or GIS contours) or to a natural receiving stream. 2-yr event discharge of 0.92 cfs at 2.86 f /s to undefined parallel contour slopes may result in near- or long-term erosion issues for downslope storage facility. Revise design to show discharge (to East) is to a manmade conveyance system. As discussed 8/17, RWSA site elevation is nearly 100' higher than U.S. Rte. 29. Engineering must evaluate possible impact of site discharge on downstream receiving properties. (Rev. 1) Addressed. Applicant: `Evaluation of the east drainage area updated to meet 9VAC25-870-66.d with the released peak flow per linear foot for the 10-yr 24-hr event less than the pre -condition, as discussed in 8/31/21 meeting.' Also discussed, Anderson-M. McCarty, 13-Oct. iv. A public drainage easement is required between SWM facility outfall and receiving manmade system, or to point site discharge reaches a receiving stream [Ref. 18-32.7.4.2]. (Rev. 1) Addressed. Applicant: `Evaluation of the east drainage area updated to meet 9VAC25-870-66.d with the released peak flow per linear foot for the 10-yr 24-hr event less than the pre -condition, as discussed in 8/31/21 meeting. No offsite public drainage easement is required.' v. PG. 41 (Postcondition —East drainage) (Rev. 1) Addressed — Applicant: `This page is an exhibit only. Construction sequence language removed.' 1. Construction sequence: a. At item 1, and wherever plan references a gravel or stone construction entrance, edit to read paved construction entrance with spray wash. Engineering Review Comments Page 4 of 7 b. At item 4, revise sequence to clarify that bioretention basin cannot be constructed unless all upslope disturbed areas are stabilized. Items that follow item 4 include rough grading, grading, building and utility construction, each with land disturbance. 2. Erosion control: (Rev. 1) Addressed — Applicant: `This page is an exhibit only. Erosion control language removed.' a. At item 6, delete reference to University of Virginia. b. Re. item 7, show stockpile area, graphically, provide temporary ESC measures to limit sediment transport from soil stockpile. 3. General notes: (Rev. 1) Addressed — Applicant: `This page is an exhibit only. General notes language removed.' a. At item 1, please clarify. Why should basin require restoration? What VDOT specification supersedes VA DEQ design specification? b. At item 2, reference VESCH, not VDOT specification. c. At item 3, please reference VESCH, not VDOT. d. At item 3, grading beyond plan -approved limits of land disturbance is impermissible. If Applicant anticipates grading beyond plan LOD, recommend revise LOD to accommodate anticipated grading need. vi. PG. 42 (Postcondition -bioretention basin) (Rev. 1) Addressed — Applicant: `This page is an exhibit only. Language removed.' a. Clarify note that reads `130 LF gravel basin access drive restore with erosion matting following removal.' Permanent SWM facility requires permanent access, which may be turf, 10' wide (Min.), 20% slope (Max.). b. `See Sheet C 12 for restoration details' label is confusing. Restoration suggests bioretention basin is damaged, in need of restoration. Clarify. c. Postcondition may claim forest /open space land cover only with deed of dedication of platted forest /open space easement. Submit easement plat application, or revise design, calculations, VaRRM.xls to eliminate postcondition FOS land cover (0.16 Ac.). (Rev. 1) NA — Applicant: `Forestlopen space is not included in post condition VaRRM.xls.' vii. PG. 44 (Postcondition —West drainage) 1. Postcondition may claim forest /open space land cover only with deed of dedication of platted forest /open space easement. Submit easement plat application, or revise design, calculations, VaRRM.xls to eliminate postcondition FOS land cover (0.09 Ac.). (Rev. 1) NA — Applicant: `Forest/open space is not included in post condition VaRRM.xls.' viii. PG. 48 (VaRRM.xls) 1. Provide Site tab data /image from DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet. (Rev. 1) Addressed. ix. PG. 60/other SCS Graphical peak discharge computations that rely on VaRRM.xls may need to be revised if VaRRM.xls is revised to eliminate postcondition forest -open space. (Rev. 1) Addressed. Applicant: `Quality calculations are the only computations that rely on VaRRM.xiS.' x. PG. 64 /Required storage vol um (V,) may increase if SCS graphical peak discharge values change. (Rev. 1) Addressed. Applicant: `Quality calculations are the only computations that rely on VaRRM.xls.' xi. PG. 68 pipe flowingfull, stain, at Laurel Park Ln: Clarify whether table values exclude any runoff expected to reach storm drains at Laurel Park Ln. That is, storm drains at Laurel Park Ln. were designed to serve separate, earlier development at HTC. Airport Road pump station analysis must include all sources that contribute runoff to the existing storm drains. Please provide explicit calculations that clearly identify sources of runoff to existing storm lines, and that indicate the existing storm drains at Laurel Park Engineering Review Comments Page 5 of 7 Ln. serve prior development and can accommodate additional Airport Road pump station runoff within the full -flow capacity of existing storm pipes to project limits of analysis, in an open -channel non -pressurized state. (Rev. 1) Addressed. Applicant: `Calculations include all drainage to the storm drains on Laurel Park Ln. Storm drain locations added to Exhibits to clarify.' 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. 1. Revise to include WPO-related sheets only; please remove sheets C 14, DCO2, DC04. (Rev. 1) Addressed. 2. Revise plan title to include reference to WP0202100035, (Rev. 1) Addressed. 3. Provide conventional plan title sheet that includes: (Rev. 1) Addressed. a. Adjacent parcel information, including: i. Deed book -page reference. ii. Vicinity map, and no greater than 1"=2,000' iii. Owner, related zoning (ZMA) or site (SDP) plan. b. PE -seal (sign /date) c. Note regarding future VDOT Berkmar Drive Ext. project. d. Note regarding proposed length and location /alignment of new 24" DI water main. e. Limits of disturbance (x.xx Ac.), to include the approximate linear Area of Land Disturbance associated with installation of approximately 4500 LF of 24" water main. f. Note: ESC measures require bond. ESC measures for linear portions (24" water main) on off -site parcels not owned by RWSA require those owners be party to the bond, unless a contractor posts the WPO plan bond. RWSA should plan accordingly, to either arrange signature information /signatures of owners (of all parcels 24" water main transits) on the WPO plan (ESC) bond, or, to require RWSA contractor post WPO plan bond (ESC/SWM). 4. Note: (Temporary construction) easements appear to be required to construct/install 24" DI water main beyond public RW, beyond RWSA tax map parcel 3241A2. Acquire and record temporary construction easements, as needed, to install 24" DI water main. Provide Engineering copy of recorded easements. (Rev. 1) Addressed. Applicant: `Permanent easement obtained for work within kohl's property. Remaining work within VDOT ROW and additional easements are not required.' 5. C05: Please check label, which may require edit, or deletion. (Rev. 1) Acknowledged. . V-W.Kow BERKMAR DR BURY RYDRNLf MYEN RATED L4D. r G V. A V B. OONNEU TO MN W TEE6ERMO R 6. C09: Please title this sheet `site layout' since a WPO plan cannot approve a site plan. (Rev. 1) Addressed. 7. Reference and incorporate SDP202100056 Engineering review comments in revised WPO plan, see comments d. 8/4/21. (Rev. 1) Addressed. 8. C10 a. Include paved wash rack detail from p.8, ACDSM, (Rev. 1) Addressed. hfti)s://www.albemarle.org/flome/ShowDocument?id=270 Engineering Review Comments Page 6 of 7 b. Provide and acquire public drainage easement across 32-41H1 to such point that concentrated bioretention basin discharge reaches manmade pipe network, or a natural receiving stream. Proposed design shows discharge to parallel slope contours, without receiving channel, with 40-ft vertical interval to a downslope storage facility, with approximately half this distance across managed steep slopes. Routing ACSA pump station bioretention basin discharge across adjacent downslope parcel with no receiving or manmade pipe system is impermissible. Please notify Engineering of deed bk.-pg. of off -site public drainage easement, and include bk.-pg. ref. on revised WPO plan. (Rev. 1) Addressed. Applicant: `Evaluation of the east drainage area updated to meet 9 VAC25-870-66.d with the released peak flow per linear foot for the 10-yr 24-hr event less than the pre -condition, as discussed in 8/31/21 meeting. No offsite public drainage easement is required.' c. Please include more deliberate grade lines to clearly indicate a proposed ditch at 130 LF gravel basin access drive leading to bioretention basin (permanent SWM facility). (Rev. 1) Addressed. Applicant: `Swale removed with grading changes for ELS.' d. A SWM facility cannot be built with initial grading, rather, permanent SWM facilities are built once all up -slope contributing drainage areas disturbed by construction, are stabilized. A sediment trap maybe required (item discussed by county with Brad Weiss, 8/17/21). Show, provide and design a trap, if temporary sediment trap is warranted —likely best location is future location of bioretention basin. Include all relevant design criteria, for example: wet/dry storage required, provided, side slope (2:1, etc.), and area draining to tap (x.xx Ac.). If sediment trap is not proposed, confirm that upslope contributing drainage area does not exceed 100 LF slope/ft. silt fence. Note: Item discussed with Brad Weiss, 8/17, telecon, 3:10-3:50pm (J. Anderson). (Rev. 1) Addressed. Applicant: `Modified mud trap proposed with wire reinforced silt fence.' e. Revise p. 11 of 160-p. submittal (Erosion Control Sequence) to include narrative discussing coordination of bioretention basin installation (if retained with revised design) with site stabilization. (Rev. 1) Addressed. f. Please remove bioretention basin (or other SWM facility) from ESC plan sheet/s. Show SWM facilities on a SWM plan sheet. (Rev. 1) Addressed. g. Include note that bioretention basin may not be constructed until all upslope contributing drainage areas are stabilized. Include note on C13, as well. (Rev. 1) Addressed. C13 Note 5. 9. Cll a. Show grading and required ESC measures and permanent stabilization sufficient to establish pads for anticipated future ground storage tank/s since these are immediately adjacent and just upslope of the proposed bioretention basin. If bioretention is installed prior to future tank grading, then future tank grading is likely to compromise (blind) soil medium, and SWM facility performance, which may contribute to avoidable effort and expense, in the future. (Rev.1) Addressed. Applicant: `GSR linework removed and note added to clarify.' b. Show soil stockpile location listed at p. 11, 3_3. Erosion Control sequence, item 3. of 160-p. initial submittal .PDF. (Rev. 1) Addressed. Process: After approval, plans will have to be bonded. The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Management Analyst will prepare bond agreement forms, which will have to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified. The agreements will have to be approved and signed by the County Attorney and County Engineer. This may take 24 weeks to obtain all the correct signatures and forms. Engineering Review Comments Page 7 of 7 Stormwater Management Facilities Maintenance agreements will also have to be completed and recorded. The 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. Permanent SWM facilities and public drainage easements require deeds of dedication. Deeds must be recorded prior to VSMP/WPO plan approval. A separate easement plat submittal (Application) is required for public drainage or SWM facility easements, which, for the moment, are proposed with Airport Road pump station VSMP. After bonding and agreements are complete, county staff will enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will have 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. This should be copied to the county. 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 under engineering applications; httos: //www.albemarle. ore/govemment/communitv-develol)ment/aonly-for/engineering-auul ications Please feel free to call if any questions: 434.296-5832 -x3069 Thank you I Anderson WP0202100035_Airport Road Pump Station_081821_101521-revl