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HomeMy WebLinkAboutWPO202100041 Review Comments WPO VSMP 2021-09-08t� OF ALB County of Albemarle COMMUNITY DEVELOPMENT DEPARTMENT VSMP Permit Plan Review Project title: HTC Area C Townhomes — VSMP Project file number: WPO2021-00041 Plan prepares Shimp Engineering, 912 E. High St., Charlottesville, VA 22902 Keane Rucker, FIT, keane(a),shimp-engineering.com Justin Shimp, PE, Tustin e shimp-en ing eering.com Owner or rep.: Post Office Land Trust, AnnMae Holdings LLC Charles Wm Hurt and Shirley L Fisher, Trustees charlie(i�virainialandcompany. com P. O. Box 8147, Charlottesville, VA 22906 Plan received date: 16 July 2021 Date of comments: 8 Sep 2021 Reviewer: John Anderson 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 Telephone:434-296-5832 WWW.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 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. 1. Revise title of SWPPP to include ref. to WPO202100041 2. Update ESC-SWM I I" x 17" plan sheet inserts, if /when revised. B. Pollution Prevention Plan (PPP) —Approved 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. 1. Cl a. Revise plan and SWPPP title /cover sheet include reference to WPO202100041. b. Replace Stormwater Management Note first sentence with these two sentences: "Per the approved ZMA200200002 and Approved SWM plans, runoff will be directed to existing regional stormwater facilities designed for a full buildout of each site. Reference Engineeringfile 2301, Hollymead Town Center, regional SWMI for block II SWM facility design (adjacent to Rt. 29), and SWM2 for block III SWM facility design (west of Laurel Park Lane). c. Despite Stormwater Management Note that states `Both facilities, as well as the offsite storm pipes which coney runoff into them, were designed for a maximum of 85% impervious cover.... ' provide LD-229 storm pipe computations and LD-204 storm inlet design data tables that consider total watershed full build -out runoff reaching offsite storm pipes.' It is unclear that existing storm Engineering Review Comments Page 2 of 5 pipes are designed for total watershed full build -out. It is important to evaluate effects of routing additional runoff to existing pipe networks. i. In the case of Area C, block I1, proposed on -site 15" HDPE connects with Ex. 18" RCP (C7) at Connor Drive. ii. In the case of Area C, block I11, proposed on -site 15" HDPE connects with Ex. 24" RCP (C8) at Lockwood Drive. 2. C2 a. Label Connor Drive east of Timberwood Blvd. b. Recommend a label to clarify that Area of block C north of Connor Drive and Timberwood Blvd, east and adjacent to Berkmar Drive Ext. is not included in WPO202100041. c. Identify regional SWM facilities as SWMI and SWM2. 3. C5, C6 a. Revise sheet title to read Site Layout, rather than Site Plan. A WPO plan does not approve a site plan. 4. C7, C8 a. Revise Conner Drive to read Connor Drive. 5. C9 a. Name roadway network (streets /Orchid Bend). 6. C11 a. Road profile will be evaluated with HTC Area C Townhomes ROAD plan. Please submit ROAD Plan at earliest convenience. b. Revise block II road & WL profile captions (since identical). c. Check block III structure profile labels (Note: 2 A2 labels); please revise. d. Check /revise block I1 storm profile captions, as needed (Profile Al-A7). e. F3-A7 profile: provide label /note specifying subgrade compaction for pipes /structures. Entire pipe -structure network is in fill. 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. 7. C14 a. Acquire offsite temporary construction easement to construct stepped retaining walls, if needed, TNT 32-43. b. Please remove extraneous linework that may be mistaken as a third (stepped) retaining wall, this linework crosses DD, proposed grade, and a feature that is unknown. Eliminate linework unless relevant to ESCP Phase 1. Highlight yellow, image, below. Engineering Review Comments Page 3 of 5 •� Va" c».niis wi M`F © 65C393. \ ZONE - - - - - - - - - - - W i 1 I . %_ c. During HTC hotel construction downslope in the same development, a sediment trap (sized per VESCH) positioned near the edge of the hotel development failed on several occasions. In that instance, sediment -laden release to neighboring parcels following storm events proved resistant to remedy. Experience of failed attempts to modify a trap with limited offset distance to property line is sufficient basis for Engineering to request additional volume for STI, ST2. Any failure of either ST will result in release of sediment -laden discharge to Connor Drive, existing storm inlets, and ex. storm network. Note: proposal to use existing culvert as sediment trap 1 outlet is virtually identical to proposal at HTC hotel, where this approach failed. GIS image, below [ HTC Area C blocks II, III] —development, blue circle left, hotel ST, blue circle, right '. Process: t ri Engineering Review Comments Page 4 of 5 WIN 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. Stormwater Management Facilities Maintenance agreements will also h _ `e be eaffilsleted and are recorded. T-4re After bonding and agFeements aFe is 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. Engineering Review Comments Page 5 of 5 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 Applications: httos: //www. albemarle. org/government/communitv-develonment/aooly-for/engineering-anol is ations Thank you. Please call if any questions — tel. 434.296-5832-x3069, or email 4anderosn2&albemarle.org. WPO202100041_HTC Area C Townhomes_098021