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Home My WebLink AboutSUB202100115 Review Comments Road Plan and Comps. 2021-07-26t� OF ALB County of Albemarle COMMUNITY DEVELOPMENT DEPARTMENT Road Plan review Project title: Worrell Drive Improvements — ROAD PLAN Project file number: SUB2021-00115 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 Telephone:434-296-5832 WWW.ALBEMARLE.ORG Plan preparer: Malachi Mills, PE / Rummell, Klepper & Kahl, LLP 2100 East Cary St., Suite 309, Richmond, VA 23223 MMILLS@RKK.COM Owner or rep.: Worrell Land and Development Company LC P.O. Box 5386, Charlottesville, VA 22905 worrell(a),cstone.net Plan received date: 23 Jun 2021 Date of comments: 26 Jul 2021 Reviewer: John Anderson, PE SUB201-00115, Engineering review comments: 1. Remove sheets C11.00, C11.01, C11.02 from the Road Plan, and include with WPO plan and application. Please submit WPO plan at earliest convenience. WPO plan approval is required concurrent with Road Plan approval. 2. C2.00: Label Worrell Office Driveway, Driveway Jl, Small Drive Jl. 3. Please remove 4"i sheet of ROAD Plan (.PDF) if not relevant (it appears to be blank, or empty). 4. C400 Existing Conditions: Show and label Ex. storm pipe elements downstream of Ex. DI at Int. Martha Jefferson Drive and Worrell Drive. 5. Remove ESC elements from C5.00, 5.01, 5.02 (demolition elements may remain). ESC and SWM design elements are to be shown (reviewed and approved) with a WPO plan (application), but not a ROAD plan application. 6. C6.00: a. Label Worrell Office Driveway, Driveway Jl, Small Drive JL b. Label width of Worrell Drive at periodic intervals. c. Proposed R =112' is less than VDOT standard Min. R' horizontal curves, for typical design speeds. d. Provide VDOT/AASHTO' basis of design. For example: Road Design Manual, Appx. B(1). ' AASHTO Guidelines for Geometric Design of Low -Volume Roads, 2019 ( httos://aashtoioumal.org/2019/05/31/aashto-issues-second-edition-of-low-volume-roads- guidelines/ ) e. Provide design speed. f. Provide, show and label posted speed limit signs on layout plan view sheets, Worrell Drive. 7. C6.00: To the extent CL of revised Worrell Drive departs existing private street easement recorded at DB- PG 642-290, show and label revised private street easement. Provide easement plat, as needed. 8. C6.00, C6.01, C6.02: Please add Worrell Drive centerline stationing, every 100', with tick marks at more frequent intervals. 9. C7.00. C7.01, C7.02: a. Similar to review item #5, above, please remove ESC symbols /elements from the road plan. Retain grading information. b. Label new path width opposite Worrell Office Driveway. c. Label traffic control signs. d. Label CG-12. 10. C7.00: Engineering Review Comments Page 2 of 3 a. Provide ADT basis of pavement design. b. Provide pavement design based on ADT: DR, DP. c. Provide Worrell Drive pavement section depth/s for stone, sub -base and surface asphalt. Label Worrell Drive section (depths). 11. C7.01: a. With road plan, provide analysis of hydraulic effect of Worrell Drive storm discharge to pond upstream of the road. At this point, Worrell Drive is a pond embankment. If hydraulic effect is negligible, provide supporting hydraulic data that compares pre- /post developed 10-yr event flows not simply through structures proposed to discharge to the pond, but through the existing structure that connects upslope /downslope ponds, passing beneath Worrell Drive. b. Show /label Ex. pipe structure (type, length, DIA) that connects ponds, that passes beneath Worrell Drive. c. Please provide discrete (pond routing) analysis. d. Storm conveyance must discharge to a manmade network, natural receiving stream, or defined drainage channel. Revise discharge at 4-1 and 5-1 to discharge to a defined drainage channel (by extending pipe to a point that is a defined drainage channel, or natural receiving stream). 12. C7.02: a. Pipe table lists pipe slope, 3-1 to 3-2 as 0.5, while C9.00 lists slope as 0.47%. Pipe slope <0.50% should be revised to meet Albemarle Engineering Drainage Plan checklist for plan reviewers, Min. slope, =0.50% [ item 3, pg. 2, checklist /Attached]. b. Label asphalt path. c. Provide asphalt path cross-section. d. Revise outfall structure 3-2 to ensure discharge is to a manmade system, natural receiving stream, or defined drainage channel. 13. C8.00: a. Please show proposed vertical alignment in lower half profile, Sta. 4+25 — 10+48.34 (end project). b. Provide vertical curve at Sta. 2+61.19 to transition from 4.51 % to 1.04% grade. Transition is abrupt, without VC. Smooth vertical curve is required to transition between grades. c. Recommend label points of intersection with intersecting driveways (Worrell Office Driveway, Driveway JI, for example). 14. C8.01: Recommend Worrell Office Driveway Min. Ks. of 15.00 (typical of pvt./public streets) for safe illumination of vertical sag curve after dark. 15. C9.00: a. Revise proposed 0.47% storm line grade, 3-1 to 3-3 to 0.50%, Min. b. Immediately upstream of line 3-1 to 3-3 is a storm line at 0.50%. Three storm pipes are proposed at Min. pipe slope, 0.50%. Pipe installed at flatter slope (<0.50%), As -built, condition, requires Engineer confirm adequate self -scour velocity and capacity in As -built condition. Pipe < Min. pipe slope may need to be replaced (along with riser section/s) to ensure adequate fall, capacity, and self -scour velocity. Engineering recommends design slope 0.55% or greater, to allow leeway during construction. c. Storm profile Storm Sewer Ex DI to 1-2 indicates 18" DIA pipe/s feed into an existing storm structure with 15" DIA INV OUT. This is atypical; revise to ensure existing DI structure and existing pipe network for this storm pipe run are adequate to convey anticipated development runoff. I.E.: Examine /route existing storm pipe network downstream of Ex. DI that receives development runoff at Int. Martha Jefferson Drive and Worrell Drive. See existing condition at Ex. DI, C4.00. 16. C 11.03: Unless overlooked, provide spread (4 in. event) for DIs on Worrell Drive. 17. If Worrell Drive, a private street, is to remain passable to thru-traffic during construction, provide narrative sequence that discusses maintenance of traffic (MOT), lane restrictions, barriers, flagging requirements, or any proposed limits on hours of construction activity (mill/pave, for example). Note: WPO Plan should indicate location of staging area/s (contractor vehicles, equipment, material storage, etc.). Engineering Review Comments Page 3 of 3 Thank you. Please call if any questions — tel. 434.296-5832-x3069, or email 4anderosn2(a),albemarle.org. SUB202100115 Worrell Drive Improv RP 072621.doc