HomeMy WebLinkAboutSDP202200015 Review Comments Initial Site Plan 2022-05-06qoa nt 401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
County of Albemarle
o � � Telephone:434-296-5832
COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG
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Site Plan review
Project title:
South Pantops Condos
Project file number:
SDP202200015
Plan prepares
Shimp Engineering, 912 E. High St., Charlottesville, VA 22902
Rachel Moon , rachel(n),shimp-engineering.com
Owner or rep.:
South Pantops H Land Trust; Charles W Hurt & Shirley L. Fisher Trustees
P.O. Box 8147, Charlottesville, VA 22906
Plan received date:
25 Mar 2022
Date of comments:
6 May 2022
Plan Coordinator:
Kevin McCollum
Reviewer:
John Anderson, PE
Engineering has reviewed the initial site plan and offers these review comments for Initial and Final Site Plan
approval.
For Initial Site Plan (ISP) approval:
a. Revise conceptual SWM location from proposed location to area further north near 2-tier retaining
wall where SWM facility inlet pipe may skirt retaining walls, an area clear of steep slopes, and
where SWM facility outfall may cross preserved steep slopes to connect with natural channel
terrain features further NW.
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Engineering Review Comments
Page 2 of 3
b. Note: SWM facility outfall pipe requires public drainage easement, and public drainage easement
will not be approved beneath /under approximate 25-ft. high stepped retaining walls.
Please consult Vistas at South Pantops approved Initial Site Plan (SDP201800018, sheet ISP5
approved 4/26/18) for approvable stormwater conveyance corridor across preserved steep slopes,
present similar with revised ISP.
ISP5, snip image:
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2. For Final Site Plan approval
a. Approved WPO plan required prior to ESP approval
b. Recorded SWM facility /public drainage easement required prior to WPO plan approval.
c. Nutrient credits, if proposed to meet state stormwater quality requirements, required prior to
receiving a grading permit, though not prior to receiving WPO plan approval.
3. C5
a. It is unclear whether retaining wall downslope of disputed boundary area can be constructed
without an offsite easement. Confirm design does not require an off -site easement, either to
construct initially or later maintain or replace this proposed retaining wall.
b. Retaining wall ht. >3' requires a building permit, retaining wall ht.>4-ft. requires sealed, detailed
retaining wall plans. Furnish retaining wall plans for WPO plan approval. Engineering reviews
retaining wall design from spatial rather than building code perspective.
c. ISP includes thirty-six (36) walls interior to development which all appear to require both building
permit and detailed /sealed retaining wall design. Provide sealed design for any wall with ht. >4-
ft. Walls that provide stair access and are not integrated into a building structure require sealed
design if ht. >4-ft.
d. Identify and label safety railing for retaining walls >3-ft. ht. Provide safety railing detail.
e. Provide landscape /planting plan for retaining walls.
f. Label each retaining wall, for reference.
g. Note: please consider retaining wall constructability and future maintenance needs.
h. Provide drainage behind tops of walls, and weeps with yard grate collection to avoid long-term
saturation, settlement, ponding, flooding etc. of highly dense residential townhouse layout.
Engineering Review Comments
Page 3 of 3
i. Wherever grade concentrates runoff against curbing, provide and label CG-6 (184.12.15.g).
j. Note railing requirements, VDOT Road Design Manual Appendix All), pg. A(1)-76 for sidewalks
when separation from the back edge of a sidewalk to the top of a 2:1 slope (or drop-off > 4 ft.) is
< 5-ft., as is the case with several proposed sidewalks adjacent to SWM facilities. Provide
required railing, or at least 5' separation.
k. Proposed FH at end of sidewalk, units 1-6, requires easement, adequate easement area may not
exist, given proximity to walk and retaining wall. Confirm FH placement acceptable to ACSA.
4. Drainage:
a. Show and label storm drain network in plan and profile views.
b. Label plan and profile views, inlets and pipes.
c. Provide VDOT LD-204, LD-229 tables (inlet computations , storm drain design computations).
d. Ensure all drainage meets drainage plan checklist (requirements) for plan reviewers (anached).
e. Confirm design meets VDOT drainage manual design criteria, for example: max. pipe slope,
stepped MHs, safety slab, pipe anchors, energy dissipation, etc.
f. Depict storm conveyance from point of collection to SWM facility (treatment /detention), and
from SWM to release to a natural drainage channel /feature.
g. Capture, route (show Aabel) rooftop storm runoff (leader lines). Rooftop runoff may not release,
but must connect with site storm conveyance, or, if it discharges near face of building at grade,
provide yard inlet network to capture roof runoff and convey this runoff to storm conveyance.
Retaining walls are proposed for most of the perimeter of the site, rooftop runoff may not be
diverted to natural outlet (channel) except /unless it is nearly immediately captured by yard
inlet/pipe system, and conveyed to SWM, first.
5. Provide vertical sight distance profile for development entrance at S. Pantops Drive.
Please feel free to call if any questions: 434.296-5832 -x3069
Thank you
I Anderson
SDP202200015 South Pantops Condos ISP 050622.docx