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HomeMy WebLinkAboutSDP202300011 Review Comments Initial Site Plan 2023-04-11County of Albemarle COMMUNITY DEVELOPMENT DEPARTMENT ��BGIN�Q' Site Plan Review Project title: Birdwood Mansion Rehabilitation - Initial Project: SDP2023-00011 Plan preparer: Maria Minnick, PE, Dewberry — mminnick@dewberry.com 4805 Lake Brook Dr., Glen Allen, VA 23060 Owner /Applicant: University of Virginia Foundation, P.O. Box 400218 Charlottesville, VA 22904-4218 Attn. Frank Hancock, PE, thancockguvafoundation.com Plan received date: 1 Mar 2023 Date of comments: 11 Apr 2023 Plan Coordinator: Andy Reitelbach Reviewer: John Anderson, PE 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 Telephone: 434-296-5832 WWW.ALBEMARLE.ORG Engineering has reviewed the Initial Site Plan and offers following comments for Final Site Plan (FSP) Approval. 1. Remove C0.2 from Final Site Plan (incl. with VSMP plan, W130202300012). Note: if soils map is required with the final site plan, pls. transfer soil data to the final site plan. Not required, however, by Engineering, with FSP. 2. Recommend T1.0 a. Include associated plan reference to WP0202300012. b. Pls. check site plan title (typo?) 3. Remove or'turn off' ESC elements or data layers, C2.L C2.2 (incl. with W130202300012). 4. WPO plan must be approved priorto final site plan approval. WPO approval requires SWM facility Agreement recordation, and easement plat (with deed) recordation. 5. C3.1: Provide no entry sign at 1-way exit from site, where 1-way split becomes 2-way traffic. 6. C3.2: Whether shown on other sheets, or not, with Site Plan Sheet/s, except item c., below: a. Provide yield condition /sign at N end of 1-way drive east of south lawn oval, where 1-way drive intersects 2-way traffic at north end of east garden, to establish right-of-way /limit potential conflicts. b. Provide'No entry' sign at circle N of mansion, to prevent wrong way traffic on 1-way spur. c. Label all sidewalk width/s. Alternatively, pis. provide Note: "See L2.02 for walkway widths." d. Label typ. parking space dimensions (L x W). e. Label HC parking space dimensions (L x W). f. Where sidewalks intersect paved vehicular travel ways, provide detectable surface pedestrian ramps meeting VDOT std., CG-12. g. Label all travel way widths, incl. 1-way drives and existing paved surface width/s of existing driveways to be widened with reinforced turf to serve fire rescue apparatus. h. Ensure accessible entrance ramp meets ADA; label ramp slope, 8.3% 1-3.02 . Building permit review will evaluate ADA compliance. 7. C3.3: 10' vertical interval along proposed new paved travel way between Golf Course Drive and Birdwood Drive creates impervious /graded turf sheet- or concentrated shallow flow without relief at Birdwood Drive. Recommend provide relief at Birdwood Drive via small DIA pipe culvert (one or more) beneath Birdwood Drive, to then release runoff east of Birdwood Drive. Since current design in effect relies on flat surface of Birdwood to convey slightly increasedstorm runoff west to east across Birdwood Drive, and apparently owner can live with that, this is a recommendation intended to Engineering Review Comments Page 2 of 2 convenience patrons of facility. Given non -mandatory nature of recommendation, Engineering recommends, should 12" DIA culvert (one or more) be installed, a level spreader (or riprap apron) to distribute concentrated pipe flow to sheet flow east of Birdwood Drive. Further, WPO202300012 should be revised to show culvert/s, if installed, but should also include note to the effect that culvert conveyance is optional,, therefore concentrated flow could be avoided without culverts, but, at Engineering recommendation, they are being installed. At this location, then, if small DIA pipe is installed beneath Birdwood Drive, Applicant need notrevise SWM design, calculations, narrative, compliance statements, etc. Without pipes, flow at this location across Birdwood Drive would be sheet, and acceptable. Engineering, however, recommends storm pipes with riprap aprons or timber ELSs at pipe ouffall to distribute flow to sheet condition, east of Birdwood Drive. If recommendation is accepted, Engineering anticipates no (or very limited) proposedgrading east of Birdwood Drive. 8. C5.1: Remove sheet from final site plan; incl. with WPO202300012—transfer construction fence chain l,inkdetail to separate civil sheet, C5.2, for example. 9. C5.4, bioretention section: level 2: Please remove section detail. Note: Level 2 requires 36" bioretention soil media. Ref. design table, 9.3 (VA DEQ Stormwater Design Specification No. 9). 10. L4.00: Bioretention basin planting plan may remain, but please ensure consistent with WPO202300012 bioretention planting plan, which will be evaluated against Table 9.3, referenced in preceding comment. Please call if any questions — tel. 434.296-5832-x3069, or email janderson2galbemarle.org. SDP20230001 I Birdwood Mansion Rehabilitation ISP 041123.