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Home My WebLink AboutSDP202200016 Review Comments Initial Site Plan 2022-04-19qoH nt 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 County of Albemarle o � � Telephone:434-296-5832 COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG �tBGIN��' Site Plan review Project title: South Pantops Drive — Parcel 20R Project file number: SDP202200016 Plan prepares Shimp Engineering, 912 E. High St., Charlottesville, VA 22902 iustin(a,shimp-engineering. com Owner or rep.: South Pantops H Land Trust; Charles W. Hurt & Shirley Fisher Trust P.O. Box 8147, Charlottesville, VA 22906 Plan received date: 21 Mar 2022 Date of comments: 19 Apr 2022 Plan Coordinator: Ben Holt Reviewer: John Anderson Engineering has reviewed the initial site plan and offers these review comments for Final Site Plan approval. SDP2022-00016 1. C2: Show linework for TMP parcel 07800-00-00-015C9 to immediate south of development parcel, 07800- 00-00-020R0. Label TMP 78-15C9; include ownership / deed bk.-pg. reference. 2. Note: If final site plan (FSP) encroaches on preserved steep slopes, revise to avoid proposed improvements on preserved steep slopes. a. SWM facility access may not traverse preserved steep slopes since, by definition, steep slopes >25% will sustain more than minimal impact with an access less than 20% grade. Access, required by ACDSM to be flatter than 20%, requires cross -contour grading of steep slopes, this increases impact. ISP design showing SWMArea between preserved steep slopes is not an approvable design unless approvable SWM facility access is provided. Also, item 2.e., below. b. SWM facilities are not public facilities. Storm pipe is deemed permissible across preserved steep slopes but only ifno other alignment that avoids steep slopes is possible. Any improvement, including storm pipe, across preserved steep slopes must meet standards listed at 18-30.7.5, and minimize impact to maximum extent possible. c. Although ISP shows SWM facility outfall to an existing 15' drainage easement, both FSP and WPO must provide considerable detail concerning receiving stream at point proposed new 15" HDPE (SWM facility outfall) pipe intersects Ex. 15' drainage easement. Type, slope, condition, stability of conveyance within existing easement, velocity; erosion: All are considerations. Also: adequacy of channel between development and Rivanna River, which requires evaluation. Existing conveyance may require improvement, improvement to be shown on FSP and WPO plan. d. Please ref. process outlined at 18-30.7.4.b.l.h. (field run survey /county Engineer approval) and 18-30.7.6 (field run survey /county board approval) which alter or amend district boundaries. Areas removed from steep slopes, whether by board or county Engineer approval, require field run survey and LS/PE-sealed slopes exhibit. If removed, former steep slopes areas are eligible for development as permitted in underlying zoning districts. e. Note: If entrance to development receives runoff from S. Pantops Drive and conveys this off -site runoff to on -site SWM, then that pipe network is public (between S. Pantops and on -site SWM) and, provided no alternative exists, a proposed public drainage easement across preserved steep slopes from S. Pantops Drive to proposed future SWM facility (which may not be located on preserved steep slopes), may be permissible. This easement alignment might meet twin objectives of storm pipe <_16% Max. grade and SWM facility access 10' Min. width, 20% max. grade, per ACDSM [p. 11: Best Management Practicesfor SWMand drainage plan checklist for reviewers]. Engineering Review Comments Page 2 of 3 3. Provide deed bk.-pg. reference for Ex. 15' drainage easement. 4. With ESP /WPO plan, provide VDOT LD-204, Stormwater Inlet Computation, and LD-229 Storm Drain Design Computation (tables). 5. An approved WPO plan is required prior to ESP approval. 6. A recorded SWM facility /public drainage easement plat (with deeds) is required prior to WPO plan approval. Easement plat application is a separate process, with on-line digital format application found here. If development is to be subdivided into individual lots, easement (SWM /public drainage) may occur with final subdivision plat. 7. Revise retaining wall design, slightly, to provide measurable clearance between Lot 7 and preserved steep slopes. Recommend 5' minimum offset to allow retaining wall construction without preserved steep slopes impact. Schematic representation showing one touching the other is not an approvable design, nor is such design practically constructible without impact to preserved steep slopes. 8. Include Note to Contractor on WPO plan and ESP that all preserved steep slopes are to be flagged prior to land -clearing, that clearing limits avoid steep slopes, and that flagging (delineating preserved steep slopes) be maintained for the duration of construction /site development. 9. If development is subdivided, which appears possible, provide private sanitary easement across Lot 12 for benefit of Lot 13. 10. Show and label existing ACSA sanitary sewer easement across development parcel. 11. Show and label proposed ACSA sanitary and water easements across development parcel. 12. Show /label private sanitary lateral easements. 13. If site is subdivided, provide and label site access easement. 14. Please note that SWM facility, public drainage, private drainage, SWM access, and ACSA easements should be located outside lots, to extent practical, to avoid access /maintenance issues /dispute with owners. 15. Revise design to provide Lot 1 with sufficient space for vehicle to exit car parking, without hitting an obstruction or leaving paved surface. 16. Provide CG-6 wherever design concentrates storm runoff against curbing. 17. Ensure site entrance provides vertical transition that meets VDOT commercial entrance vertical transition standard (street grade less than 4% for a min. of 40' from the edge of pavement of the intersected street. (This grade can be within the first road curve which transitions from the 2% intersected cross grade) {policy, follows ord. for travelways 18-4.12) ). 18. ESP /WPO plan should provide positive grade and spot elevations to ensure that surface runoff does not reach dwelling unit walls. USBC requires positive slope for a min. distance, measured from exterior walls, but FSP/WPO must clarify design, and ensure positive drainage awayfrom front of units facing S. Pantops Drive. Please provide contours that indicate positive drainage away from street -face of structures. Provide yard inlets to convey surface runoff to SWM detention and treatment system. 19. Show /label ACSA water service to development, and laterals to each unit. Do not locate water meters between paved 2-car parking at rear of attached units, as they are inevitably damaged at routinely trafficked locations. Experience guides: water meter location between paved 2-car parking is disapproved. 20. Engineering recommends coordinate and submit steep slopes exhibit, if amendment to steep slopes district boundary is proposed, 21. Please submit WPO application /plan at earliest convenience. 22. C3: Label heavy dash linework. If heavy dash line indicates limits of disturbance, exclude preserved steep slopes from LOD, unless expressly permitted by ordinance. Please feel free to call if any questions: 434.296-5832 -x3069 Thank you J. Anderson Engineering Review Comments Page 3 of 3 SDP202200016_S_Pantops Drive parcel 20R_ISP 041922.docx