HomeMy WebLinkAboutWPO200800088 Review Comments Stormwater Management Plan 2008-10-09� OF AL
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project:
J.W. Townsend Landscaping Improvements — Minor Amendment
[SDP200800081 ]
Plan preparer:
Jim Taggart, TCS Engineering [fax 361 -1216]
Owner or rep.:
J.W. Townsend [email jay @townsendlandscape.com]
Plan received date:
4 June 2008
Rev, 1:
25 August 2008
Date of comments:
22 July 2008
Rev, 1:
09 Oct.. 2008
Reviewer:
Amy Pflaum, Current Development Review Engineer
Rev.I :
John Diez, Current Development Engineering Technician
Minor Site Plan Amendment Comments
Easements or letters of intent are required for off -site work. It appears that temporary grading and
construction easements will be necessary from TMP's 32 -6A and 32 -22B1. Please submit
easement documents for all new easements or demonstrate that these easements are not necessary.
(Rev. 1) Comment has not been addressed
2. All slopes steeper than 3:1 will require non - grassed low maintenance ground cover, please specify
with a note on the plan. [DM]
(Rev. I) Comment has been addressed
3. In the Albemarle County Development Area, curbing is required on all parking areas and
travelways with VDOT designations (CG -2, CG -6).
(Rev. 1) Comment has not been addressed. If you do not wish to add curb, then please submit a
waiver request as per section 18.4.12.2.c.2.
4. Although labeled as 8.25% on the plan, the portion of the proposed travelway uphill of the two
new parking areas is graded at 20 %. Travelways should not exceed a 10% grade.
(Rev. 1) Comment has not been addressed. There still seems to be grades that exceed 10% on
the travelway.
5. A guardrail with VDOT designations (GR -2, GR -2a, etc.) is required next to parking or travelways
adjacent to retaining walls or drop -offs of greater than 4 feet, with start and end sections labeled.
[18- 32.7.2]
(Rev. 1) Comment has not been addressed
6. An Erosion & Sediment Control Plan and Stormwater Management Plan are required. Please
submit along with a Water Protection Ordinance application. Comments #7 -16 will need to be
addressed with the WPO.
(Rev. 1) Comment has been addressed
7. Please remove all Erosion & Sediment Control features on the Site Plan.
Albemarle County Community Development
Engineering Review Comments
Page 2 of 3
8. Location of the retaining wall is not clear. Please provide start and end elevations for the retaining
wall, as well as elevation marks throughout the wall.
9. Please provide retaining wall details referenced from the plans. A typical manufacturers drawing
for segmented block walls, or VDOT reference, is acceptable, with any applicable safety railings
or guardrail shown.
10. Small scale of plan makes it difficult to determine dimensions of parking and loading spaces.
Stormwater Management Plan Comments
� .. ....... ...... area to the proposed stormwater management pond and sub-
areas to the culverts.
(Rev. 1) Comment has been addressed
12. Please provide culvert computations for the two proposed culverts under the travelway.
(Rev. 1) Comment has been addressed
13. Please provide a cross section detail of the proposed pond.
(Rev. 1) Comment has been addressed
14. The pond is sized as a detention facility, but no outlet structure is shown. Please provide details
and sizing calculations for the outlet structure.
(Rev. 1) Comment has been addressed
15. Please address the stormwater management of the concentrated run -off from the proposed pond.
Identify the adequate channel from this site. It appears a drainage easement may be needed from
TMP 32 -22B 1.
(Rev. 1) Comment has not been addressed. Concentrated run -off from the proposed pond has
not been addressed. Concentrated run -off appears to be flowing to the neighboring property.
Please identify the adequate channel from this site. Also, please provide a drainage easement
from TMP 32 -22B1.
16. A stormwater management easement is required around the proposed swale and pond and any
associated structures.
(Rev. 1) Comment has not been addressed. The easement must be extended to the property line
by Rte. 29
17. Please provide for vehicle access to the proposed pond. Access must be graded to 10' width and
less than 20% grade, gravel surface or better is required for grades over 10 %. Please provide a
minimum 10' wide permanent easement over the access.
(Rev. 1) Comment has been addressed
18. A Stormwater Management bond amount will be computed by the County once the WPO plans
have been approved. A completed copy of the standard stormwater management maintenance
agreement and fee for recordation for any stormwater management facilities will be required. [17-
304E]
19. Please submit a completed copy of the standard Stormwater Maintenance Agreement and fee for
recordation for the proposed stormwater management facilities.
20. Please provide all existing easements with deed book references, locations and dimensions [18-
32.6.6, 14 -302]
Albemarle County Community Development
Engineering Review Comments
Page 3 of 3
21. Please provide a detail of the proposed grassed swale per the VSMH (blue book) 3.13
22. Please specify all dimensions on the outlet protection detail.
23. Please include a detention summary table with pre - development and post - development rate
calculations.
24. Please provide a float calculation for the pond riser structure
25. If the pond is to provide extended detention, please design per the VSMH (blue book) 3.07.
26. Please simplify post - development calculations so that there is one drainage area to the pond.
27. Please specify water quality volume (WQV) method and counts.
28. Please provide a plan view of the pond at a larger scale so that we may review the grading. Scale
should be I" = 20' — 30'.
Erosion & Sediment Control Plan Comments
29. An Erosion & Sediment Control bond amount will be computed by the County once the WPO
plans have been approved.
30. Please include the acreage of disturbance in the project description of the narrative.
(Rev. I) Comment has been addressed
31. Is the proposed pond to serve as a sediment basin during construction? If so, please provide sizing
calculations and details per the VESCH 3.14
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