HomeMy WebLinkAboutSDP201900049 Review Comments Final Site Plan and Comps. 2019-11-01Berkmar Drive Apartments – Final
SDP201900049
Engineering Comments (David James):
1. [John A., ISP comment] Obtain and furnish copy of wetland delineation coordination with the U.S. Army
Corps of Engineers. Provide copy or evidence of permit coordination with the USACE for impacts to
waters of the U.S., or wetlands, consistent with federal and state law.
Response: Wetland delineation coordination is underway and will be provided prior to final site plan
approval.
(Rev.1) Comment still valid.
2. Submit a VSMP application for review. The VSMP plan must be approved prior to FSP approval.
(Rev.1) Acknowledged.
3. Remove sheets C3.0 – C3.4 (E&SC plan related).
(Rev.1) Addressed.
4. Show any improvements outside of VDOT ROW in an easement (landscape, sidewalk, drainage,
etc) and easements to be dedicated to the public.
Response: No public improvements are proposed outside VDOT ROW for this project.
(Rev.1) Acknowledged.
5. Show any offsite work in an easement (outside of property line). A letter of permission from an
off-site property owner will suffice for the purposes of plan review or record a plat.
Response: Private easements for offsite work have been added to the utility and grading plans.
These private easements have been recorded under a pirate easement plat.
(Rev.1) Acknowledged.
6. Sheet 2.0/3.0: Verify drain inlet location near proposed entrance installation.
Response: Proposed inlet information based on design plans for Berkmar Drive Extension.
(Rev.1) Are plans approved, already installed? It appears, based upon the profiles, that the
existing inlet will need to be raised to match the proposed site grading.
7. Ensure 100% capture at entrance so no site runoff flow runs out entrance into street travel
lanes. [VDOT DM 9.4.5.2, 9.4.6.2] Will proposed entrance require culvert(s)?
(Rev.1) Addressed.
8. Show accurate wall thickness & batter on the plan view sheets.
Response: Wall thickness shown are approx. and will be revised once final wall design is
provided by others.
(Rev.1) Acknowledged.
9. Show retaining wall locations and footer depth on the utility profile sheets.
Response: Wall footers will be added to the profile views once final wall design is provided by
others.
(Rev.1) Acknowledged.
10. Structural design plans will be required for walls over 4’ high.
Response: Wall design plans by others will be provided for review once completed.
(Rev.1) Acknowledged.
11. Show safety railing for walls over 30” high on the plans where next to vehicle or pedestrian
travelways. [DSM, pg. 22]
(Rev.1) Addressed.
12. Sheet 6.2: Tie in grading along roadway.
(Rev.1) Addressed.
13. Grading – Constructed slopes steeper than 3:1 must be permanently stabilized with vegetation
hardier than grass, which will not require mowing. Low maintenance is key. Highlight/Shade
areas where required. [DSM, pg. 22]
Links/refs:
https://www.deq.virginia.gov/Portals/0/DEQ/Water/StormwaterManagement/Erosion_Sediment_C
ontrol_Handbook/Chapter%203%20-%203.32.pdf
www.deq.virginia.gov/Portals/0/DEQ/Water/StormwaterManagement/Erosion_Sediment_Control_
Handbook/Chapter%203%20-%203.37.pdf
(Rev.1) Not addressed. You can show these areas on the landscaping or grading plan. Please
label slopes 3:1 and steeper.
14. Sheet 4.0 - 4.2:
a. Label/callout the inner parking lot curbing with VDOT designations. If no curb required,
label the EOP.
b. Label/callout CG-12.
c. Label all sidewalk widths.
d. Callout where any transitions occur.
(Rev.1) Addressed.
15. Sheet 6.1/etc:
a. Add drain inlet before curb bumpout and gutter along parking near buildings 1 & 3.
b. Correct the grading near Mail Kiosk. The slope appears to exceed 2:1. [DSM, pg. 22]
(Rev.1) Addressed.
16. Sheet 6.3/6.4:
a. Show profile for pipes & structures shown on Sheet 6.2, Inset I-2.
b. Show pipe runs: Storm 5 to 3, 3 to 1, 61 to 3.
c. Show HGL, Label pipe crossing’s separation distance, ensure 1’ min.
d. Provide 2.0’ or ½ D minimum cover (whichever is greater). Ensure cover is adequate for
pipes 6 - 12.
(Rev.1) Partially addressed. It looks like some of the pipe are operating under pressure under
design flow HGL. The network should operate under open channel flow where no pressure
situations exist. {DSM, section 6}. The HGL is near the surface for str. 37 & 39 and the top
inlets should be raised. All other pipes should be made water tight double walled/sealed
where HGL above them.
17. Sheet 6.5/etc:
a. Access hole spacing is 50’ (max) for 12” dia. pipe or less.
b. Show tables for pipes & structures shown on Sheet 6.2, Inset I-2.
(Rev.1) Addressed.
18. Sheet 7.0/7.1: Label/show TOC line, LOD.
Response: Sheets 7.0 & 7.1 have been removed from this plan set and moved to the WPO plan
set.
(Rev.1) Acknowledged.
19. Sheet 7.2: Label/show catchment areas, TOC, Q for the inlet structures. Provide inlet design
calcs.
Response: The Inlet Drainage Area Map has been renumbered as sheet C6.8. Catchment areas
and runoff coefficients are labeled on this sheet, and corresponding inlet design calculations are
found on sheet C6.9.
(Rev.1) Addressed.
20. Label ditches & channels. Provide design calcs. Show geometry and adequate lining information.
21. Show culverts are designed adequately (calcs).
(Rev.1) Addressed.
22. Show storm drain pipes are designed adequately (calcs).
(Rev.1) Addressed.
23. Show entrances with a VDOT designation (PE-1, CG-9a, etc).
(Rev.1) Not addressed.
24. Submit profile of the entrance road. Minimum K values of 5 for crest and 15 for sag should be
met.
25. Show stationing & labels for the entrance road.
26. Label street name or designation.
27. Show street address sign at entrance & at opposite side from stop sign.
(Rev.1) Addressed.
28. Show 10’ wide (min) vehicle maintenance access to the SWM facility’s forebay & riser structure.
[DSM, pg. 12]
Response: SWM access easement will be finalized upon revised VSMP plan pending comments
from County review.
(Rev.1) Acknowledged.
29. Provide estimate of cut/fill volumes for the entrance road & for the total site.
(Rev.1) Please provide this estimate on the VSMP plan.
30. Note: There is some disagreement between the drawing and GIS where existing site features are
shown. For example, the existing stream to the north and pond is shown inside the property
line. On GIS it’s outside.
31. Note: Stormwater management / Drainage design will be reviewed for local/state compliance
with the VSMP plan.
32. (Rev.1) Sheet 6.2: Adjust grading at entrance to be 2:1 or under. The slope there appears to be
as much as 70%.
33. (Rev.1) Sheets 6.3-6.6: Add note that safety slabs (SL-1) are required in any structure taller
than 12’.
34. (Rev.1) Add guardrail along the turn radius of rightout lane.
35. (Rev.1) Add gripping rail for sidewalks at 5% or greater grade.