HomeMy WebLinkAboutWPO201000070 Review Comments Stormwater Management Plan 2011-02-11� OF AL
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project:
Plan preparer:
Owner or rep.:
Plan received date:
Rev. 1:
Rev. 2:
Date of comments:
Rev. 1:
Rev. 2:
Reviewer:
National College [SDP201000083, WP02010000701
Craig Kotarski [craig.kotarski @timmons.com]
Corolla Management Corporation
25 October 2010
28 December 2010
22 February 2011
9 December 2010
2 February 2011
28 February 2011
John P. Diez — Current Development - Engineering Technician
A. Final site plan (SDP201000083)
1. Please provide a copy of the approved permit for the wetland disturbance.
(Rev. 1) Comment has been addressed.
2. It appears that some sheets in the set of plans have an incorrect scale. Please revise.
(Rev. 1) Comment has been addressed.
3. Please provide the elevations for the illustrated benchmarks on sheet C2.0.
(Rev. 1) Comment has been addressed.
4. Please provide the maximum height to all retaining walls.
(Rev. 1) Comment has been addressed.
5. Safety railings must be shown for retaining wall over 4' high.
(Rev. 1) Comment has been addressed.
6. Guardrail with VDOT designations must be shown for retaining walls next to parking or
travelways. [ 18- 32.7.2]
(Rev. 1) Comment has been addressed.
7. A construction easement will be required for the work being done on the north side of the
property. All required easements must be recorded prior to final site plan approval.
(Rev. 1) Comment has been acknowledged.
8. Please provide an entrance profile showing adequate landing. Entrance must not exceed 4% grade
for a distance of 40' from the intersected street, measured anywhere in the entrance. [18- 4.12.17]
(Rev. 1) Comment has been addressed.
9. Please provide site distance triangles. This is to be measured from a point in an intersection 10' off
of the edge of pavement of the intersected travelway, to a point on the travelway centerline.
(Rev. 1) Comment has been addressed.
10. VDOT approval must be obtained prior to final site plan approval.
(Rev. 1) Comment has been addressed.
11. Please label all parking and travelways dimensions on the plans.
(Rev. 1) Comment has been addressed.
12. It appears that the pathway along the south side of the property is being removed. Please show it
on the demolition plan.
(Rev. 1) Comment has been addressed.
Engineering Review Comments
Page 2 of 3
13. Please provide a loading space or submit a request for modification to the provision of
[ 18- 4.12.13f.]
(Rev. 1) Comment has been acknowledged.
14. Please extend the dumpster pad a minimum of 8' beyond the front of the dumpster. [18- 4.12.19]
(Rev. 1) Comment has not been addressed. The front must be extended to 8' or the bollards
must be moved further back towards the rear.
(Rev. 2) Comment has been addressed.
15. Dumpster pad detail or specification must be a minimum 4" stone base and 6" concrete of 3000 psi
at 28 days, or stronger, reinforced with a minimum grid of wire reinforcing or #4 bars at 12 "on
center.
(Rev. 1) Comment has been addressed.
16. Sidewalks abutting parking must be 6' wide (exclusive curb), or bumper blocks must be provided.
(Rev. 1) Comment has been addressed.
17. It appears that the sidewalk in the center island of the parking lot. Sidewalks must be a minimum
of 5', exclusive of curb.
(Rev. 1) Comment has been addressed.
18. Please provide all proposed and existing storm sewer pipes with arrows indicating direction of
flow.
(Rev. 1) Comment has been addressed.
19. Details must be provided for any pipe or drainage structure through or under walls.
(Rev. 1) Comment has been addressed.
20. Please show all sanitary sewer crossings on STR #205 on sheet C7.0.
(Rev. 1) Comment has been addressed.
21. Safety Slabs (SL -1) must be provided for STR #114 and STR #206.
(Rev. 1) Comment has been addressed.
22. Drain inlet lengths on STR #114 and STR #206 on the Storm Structure Table do not match with the
Stormwater Inlet Computation.
(Rev. 1) Comment has not been addressed. STR #114 still does not match.
(Rev. 2) Comment has been addressed.
23. (Rev. 2) Please provide a manhole structure on the intersection of pipes #219 and #227 for access.
(Rev. 2) Comment has been addressed.
24. (Rev. 2) The STR# and length seem to be incorrect for the profile on STR232 — STR218 on sheet
C7.0. It is STR #231 and the length does not match with the Storm Structure Table. Please revise.
(Rev. 2) Comment has been addressed.
B. Stormwater Management plan (WP0201000071)
1 rI„V IUI. u l kJIL1JJIl,O_ l I.,,,ry Vl 3Lu,idard stormwater maintenance agreement and fee for
recordation for any stormwater management facilities. [ 17 -304E]
(Rev. 1) Comment has been acknowledged.
2. In order to capture the most out of the proposed travelway, please provide an addition curb inlet on
the east side of the proposed stub -out.
(Rev. 1) Comment has been addressed.
3. Please provide detailed calculations for the MS -19 analysis on channel adequacy. Please refer to
the Virginia Erosion and Sediment Control Handbook for proper guidelines.
(Rev. 1) Comment has not been addressed. Cross - sections of the downstream channel need to
be taken with calculations performed with varying calculated and permissible velocities for
each segment. The downstream drainage system should also be verified until the pipe running
underneath Route 29 is reached.
(Rev. 2) Per VDOT's decision, comment has been addressed.
Engineering Review Comments
Page 3 of 3
4. Please provide a detailed drainage area map showing the IS and 2S drainage areas.
(Rev. 1) Comment has been addressed.
5. Please provide calculations illustrating Time of Concentration and how the C- Values were
obtained.
(Rev. 1) Comment has been addressed.
C. Erosion & Sediment Control plan (WPO201000071)
1. The construction entrance must drain to a sediment trap.
(Rev. 1) Comment has been addressed.
2. Please provide Temporary Seeding (TS) and Permanent Seeding (PS) in Phase I.
(Rev. 1) Comment has been addressed.
3. Please provide inlet protections to all proposed and existing inlets in Phase 1.
(Rev. 1) Comment has been addressed.
4. Please provide a stockpile location.
(Rev. 1) Comment has been addressed.
5. Please provide a staging and parking area.
(Rev. 1) Comment has been addressed.
6. Please provide outlet protection for STR #100 for Phases I and II.
(Rev. 1) Comment has been addressed.
7. Sediment Trap #1 shows a dimension of 22'X72' in the Sediment Trap Summary and 22'X74' on
the plans. Please revise.
(Rev. 1) Comment has not been addressed.
(Rev. 2) Comment has been addressed.
8. The sequence does not include the installation of Sediment Trap #1. Please revise
(Rev. 1) Comment has been addressed.
9. It appears that the perimeter controls for this site are being utilized inefficiently. Engineering
recommends that a meeting be held to reach a more structured solution to the E &S design of this
site.
(Rev. 1) Comment has not been addressed. It seems that the sediment trap can be moved
towards the inlet by the entrance. The plans show limits of disturbance around that area by the
proposed curbed island. According to the Virginia Erosion and Sediment Control Handbook,
all construction entrances must drain to a sediment trap and it would seem that this is the most
efficient spot for it. In addition, a right -of -way diversion should be installed to help dirent the
runoff to the trap.
(Rev. 2) Comment has been addressed.
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