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HomeMy WebLinkAboutSUB202100161 Correspondence 2022-03-18® ROUDABUSH, GALE & ASSOCIATES, INC.1 March 151h, 2022 Mr. John Anderson Albemarle County Engineering Department 401 McIntire Road Charlottesville, VA 22902 Project Title: Dunlora Farm — Phase 1 Road & BFaiRage Utility Plan Dear John/Cameron, Please find attached the revised. The plans have been revised to address the comments received from the County of Albemarle's Planning Department dated October 29`h, 2021 and Engineering Department dated November 19`h, 2021. Planning Department 1. Please be aware that Planning staff are only reviewing the road plans for compliance with applicable street design requirements from the Subdivision Ordinance and Zoning Ordinance. • Comment acknowledged. 2. Please revise the plan title on Sheet 1 so that it states "Dunlora Farms Subdivision Phase 1 Road Plans." • Comment acknowledged. 3. [18-32-7.9.5 (d)] Street trees are required to be planted 50 ft. on center. The landscape plan shows trees spaced at various intervals that do not comply with this requirement. Some streets are missing trees entirely along one side, specifically Goldsberry Lane and Miranda Crossing. Please revise the street tree locations so that trees are spaced every 50 ft. Street Trees have been provided to meet the 50' frontage requirement, providing 10' or more separation to the utility service laterals. Some storm sewer pipes were adjusted to allow for plantings within the planting strip. Engineering Department Sheet 1 1. Revise plan title to include reference to SUB202100161. 0 Comment noted. The Cover sheet has been updated to reference SUB202100161. Engineering/Planning Review Comments Page 3 of 4 2. Recommend revise plan title to include reference to Phase 1. • Plans have been revised to include reference to Phase I. 3. Include title sheet note reference to associated plan: WPO202100063. • Plans have been revised to reference WPO202100063. 4. Recommend title sheet note reference to Steep Slopes Exhibit approved 3/23/21, associated with preliminary subdivision plat, SUB2020-00223. • Cover sheet Site Data has been updated to indicate the Steep Slopes exhibit approved 3/23/21 as well as the Subdivision Plat (SUB2020-00223) Sheet 2 S. Recommend include public road acceptance guidance at this link: https://www.albema rle.org/home/showpu bl isheddocument/1276/63732132404 3370000 • Public road acceptance guidance link has been added to the Cover Sheet (sheet 1). 6. Incorporate slopes shown to be less steep than 25%, per approved steep slopes exhibit; recommend legend distinguish newly -designated non -steep slopes as this may aid review, construction, compliance, and limit misunderstandings. • 25% or greater steep slopes shown on Sheet 4, as derived & obtained from the topographic survey. And approved slope exhibit. Notation added to the legend. Sheet 5 7. Show and label RW width on Goldsberry Lane and Miranda Crossing. • RW widths have been added on Goldsberry Lane and Miranda Crossing. 8. Coordinate any wetland impact permit or mitigation requirements with Vinny Pero, USACE. • There are no wetland impacts associated with this phase. Anticipated future wetland impacts have/are being coordinated with Vinny Pero, USACE. 9. Please confirm stop sign placement at intersection of Fowler Street and Odom Court, since Fowler Street presents a more natural through movement, if stop sign is located on Odom Court. • Label indicating Stop Sign location on Odom Court at the intersection of Fowler Street has been added to Sheet 5. 10. Label attached unit driveway private entrances (PE), and provide VDOT PE detail. 0 Entrances for future driveways shown and labeled. All roadways are curb & gutter. Engineering/Planning Review Comments Page 4 of 4 11. Label lots. • Lot labels have been added to the plan sheet. 12. Label curbing. • Additional labeling indicating curb type has been added to the plan sheet. 13. Label all traffic control signs (stop, no parking, speed limit, etc.) • Additional labeling has been added to indicate approximate locations of traffic control signs. Sheet 6 14. Provide permanent barrier at each end of Odom Court hammerhead to prevent off -road incident. Unbroken unrecoverable slopes lie immediately adjacent to curb at each end of the hammerhead. Permanent barrier may not consist of landscaping only, but may include landscape screening. Recommend VDOT-class permanent GR-2. • Guardrails have been added and labeled and shown on sheet 5. 15. Provide and label interim barriers at ends of Fowler Street and Miranda Crossing. • Comment noted. Labels have been added to sheet 6 to indicate interim barriers at Fowler Street and Miranda Crossing. 16. Provide label reference to WPO2021-00063 at ends of 18" and 24" HDPE pipes that daylight behind third lot on N side of Odom Court. • Reference to WPO-2021-00063 has been added to plan sheet 6. 17. Provide footprint outline and labels of WPO2021-00063 SWM facilities, to clarify that HDPE storm pipes do not simply daylight, but discharge to stormwater management facilities. • SWM pond location shown within the plan -set, WPO references added 18. Show and label public drainage easements for any storm pipe located outside public RW. • Public drainage easements have been added and labeled. 19. Provide and show roof leader lines since WPO2021-00063 relies on post -developed sheet flow. Roofleader lines need to connect with storm conveyance system. • The rear of perimeter lots shall be captured and conveyed to the SWIM pond location utilizing ditches; hydraulic analysis ditch sections and private easements provided for ditches. 20. Provide reverse bench and surface water diversion for 40-ft. vertical interval over 3:1 slopes east of Fowler Street along north boundary of parcel. Ref. requirements at 18-4.3.3.C. Engineering/Planning Review Comments Page 5 of 4 • A reverse bench has been incorporated in to the proposed grading on the east side of Fowler Street and labeled on Sheet 6. 21. Note especially requirement prohibiting concentrated storm runoff release across fill or cut slopes, which prohibits (roof) downspout release, specifically. Ref. 18-4.3.3.C.4. • Rear yard swales shall convey disturbed areas to the SWM pond. Private easements added for perpetual HOA maintenance of ditches Sheet 7 22. Revise prop. Storm sewer easement label to read 'public drainage easement' • The label has been updated to read 'public drainage easement'. 23. On this or prior sheet, provide and label proposed SWM facility easements. • SWM Easement has been added 24. On this or prior sheet, provide and label proposed SWM facility access easements. • SWM easements appear labeled on Sheets 6 & 7. Sheet 8 25. Typical street section includes Goldsberry Lane and Odom Court; please confirm each of these roads is built with 8" subbase (21A), since sheet 10 indicates Goldsberry Lane has 4" 21A stone. • Goldsberry Lane and Odom Court are now shown with 8" subbase (21A) and sheet 10 has also been updated to reflect this change. 26. Fowler Street and Miranda Crossing profiles include tangent sections with more than one grade label;please check and revise as needed (list a single %grade in tangent sections). • Fowler Street and Miranda Crossing profiles have been updated to be consistently graded. 27. Ensure Fowler Street and Miranda Crossing tie with smooth tangent or smooth vertical curve to corresponding sections to be built in Belvedere development. Ref. SUB202100195 ROAD plan. • Fowler Street and Miranda Crossing tie-ins are now smooth between the Belvedere development and this plan. 28. Miranda Crossing profile includes 'Intersection fire road' label; please delineate fire road in plan view onsheet 5. 0 The fire road is not being shown on sheet 5 as it is not to be built for Phase 1. Engineering/Planning Review Comments Page 6 of 4 29. Provide underdrains, VDOT UD-1, at vertical sags and proposed cut/fill transitions; show and label in profile. • CD-1 & CD-2 have instead been added to Plan & Profile. Sheet 9 30. Provide Odom Court sight distance easement across lot at NW corner of Int. Fowler Street and Odom Court. May record easement with final subdivision plat. • Comment noted. A label has been added to Sheet 9. Sheet 10 31. Provide sight distance easement across 2 lots at NW corner of intersection of Goldsberry Lane and Miranda Crossing. May record easement with final subdivision plat. • Label have been added to Sheet 10 showing sight distance easements. Sheet 11 32. 7 or more storm structures require safety slab. Label structures that require VDOT SL-1 (vertical interval between INV OUT and TOP > 12.0'). • All structures requiring safety slab have been identified on the Storm Structure Schedule. 33. STRM 128-130 profile existing grade profile is inconsistent with sheet 8, which shows structure will be infill; please check and revise as needed. • Profiles have been verified for consistency. 34. If pipe between Stir. 128 and 130 is in fill, recommend revise pipe slope since any deflection may require constructive remedy difficult or expensive to perform once storm conveyance system is complete. 0.5% pipe slope, the minimum, affords little leeway for error of in a fill section. • Pipe slopes have been increased where practical. Where capacity is a concern, pipe slopes have been increased, allowing for variations in contractibility. 35. STRM 120-126: Recommend increase proposed 0.50% pipe slope, since pipe is in fill section. • Pipe slopes have been increased where practical. Where capacity is a concern, pipe slopes have been increased, allowing for variations in contractibility. Sheet 12 36. VDOT LD-204: Revise inlet length/s to avoid spread > Y2travellane width. Several inlets are insufficient length. • Inlet lengths have been adjusted to prevent spread from reaching over Y2 the travel lane width. Sheet 13 37. See comment at items 19 and 21 concerning roof runoff, leader lines, storm conveyance, and sheet flow. Revise linework to provide capture and conveyance of entire roofscape since concentrated downspout runoff may not release to cut or fill slopes. Note: splash blocks do not transition concentrated flow to sheetflow. • Rear yard swales shall convey disturbed areas to the SWM pond. Private easements added for perpetual HOA maintenance of ditches We thank you for taking the time to review these plans and trust the above adequately addresses your comments. However, please let me know if you have any questions or require additional information. Sincerely, Chris Mulligan, P.E.