HomeMy WebLinkAboutWPO200900075 Review Comments Stormwater Management Plan 2010-02-26OF 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: Airport Road Office Plaza - Final [SDP200900089 & WP0200900075]
Plan preparer: Frank Pohl; Timmons Group
[frank.pohl @ timmons.com]
Owner /Applicant: Airport Road Office Plaza LLC C/O Management Services Corp.
Plan received date: 6 November 2009
Rev. 1:
Rev. 2:
Date of comments:
Rev. 1:
Rev. 2:
Reviewer:
A. Final Site Plan
11 January 2010
17 February 2010
19 November 2009
27 January 2010
26 February 2010
John P. Diez — Engineering Technician
L Stormwater Management plans and Erosion and Sediment Control plans have been submitted
without a WPO application. Please submit a Water Protection Ordinance application and
accompanying fee. Review of the Stormawater Management and Erosion and Sediment Control
plans will commence once the WPO application and fee are received.
(Rev. I) Comment has been addressed.
2. All topography should be at least visually verified by the designer within the last year. [18- 32.6.6]
(Rev. I) Comment has been noted on the letter.
3. There appear to be discrepancies with the existing contour lines shown for this site and those
shown for the Deerwood subdivision. Please review.
(Rev. I) Comment has been addressed.
4. Proposed slopes steeper than 3:1 have low maintenance (not grass) ground cover specified on the
plan.
(Rev. I) Comment has been addressed.
5. Please label retaining walls with maximum height.
(Rev. I) Comment has been addressed.
6. Safety railing must be shown for retaining walls over 4' high (building permit may be stricter).
(Rev. I) Comment has been addressed.
7. Guardrail with VDOT designations must be shown for retaining walls next to parking or
travelways. [18- 32.7.2]
(Rev. I) Comment has been addressed.
8. Structural design and computations must be provided for the proposed retaining wall. Please refer
to Albemarle County Design Standards Manual Section 8 — Grading, B — Retaining Walls.
(Rev. I) Comment has not been addressed.
9. Please label entrance with a VDOT designation (PE -1, CG -9a, etc.)
(Rev. I) Comment has been addressed.
Albemarle County Community Development
Engineering Review Comments
Page 2 of 3
10. Please provide radii on the entrances. 12.5' minimum radii on entrances (or per VDOT
requirements, typically 25' — 35')
(Rev. 1) Comment has been addressed.
11. VDOT approval must be obtained for any plan affecting public right -of -way.
(Rev. 1) Comment has been acknowledged.
12. Sidewalk abutting parking must be 6' wide (exclusive of curb), or bumper blocks are provided.
Please refer to the Design Standards Manual.
(Rev. 1) Comment has been addressed.
13. Bumper blocks must be provided in the tandem parking area. [18- 4.12.16e]
(Rev. 1) Based on previous meeting held on 112112010, please disregard this comment.
14. Dumpster pad detail or specification must be a minimum 4" stone base and 4" concrete of 3000 psi
at 28 days, or stronger. [DM]
(Rev. 1) Comment has been addressed.
15. Pipe slopes must be at 0.5% min. to 16% max. (per VDOT standards for anchors over 16 %)
(Rev. 1) Comment has been addressed.
16. All spreads must be no greater than 10'.
(Rev. 1) Comment has been addressed.
17. Please provide dimensions and stone sizes for all outfalls.
(Rev. 1) Comment has been addressed.
18. The labels on the drainage structures do not match with drainage computations and profiles.
(Rev. 1) Comment has been addressed.
19. Please provide copies of the approved permits for the disturbance of the wetlands.
(Rev. 1) Comment has been acknowledged.
B. Stormwater Management Plan
20. Please provide a completed copy of the standard stormwater maintenance agreement and fee for
recordation for any stormwater management facilities. [ 17 -304E]
(Rev. 2) Comment has been noted.
21. Please provide copies of manufacturer's approval of the plan for any manufactured stormwater
management facilities.
(Rev. 2) Comment has been addressed.
22. The ponding depth for the biofilters must be 0.5'.
(Rev. 2)Due to further review, please disregard this comment.
23. The 8'X8' Concrete Block Detail needs to be revised to match the plans.
(Rev. 2) Comment has not been addressed. The detail shows two of the pipes as STR 103.
Please revise.
24. SWM structure 103 on the plans does not match 8'X8' Concrete Box detail.
(Rev. 2) Comment has been addressed.
25. Inlet types on the Storm Structure Schedule do not match with the Stormwater Inlet Computations.
Please revise.
(Rev. 2) Comment has been addressed.
Albemarle County Community Development
Engineering Review Comments
Page 3 of 3
C. Erosion and Sediment Control Plan
26. Per our Thursday, 1/21/10 meeting, please revise plans to show how the site will be protected
through each phase of the construction.
(Rev. 2) Comment has not been addressed. Please revise E &S plan per our meeting on
212512010.
27. Top trap dimensions for the Sediment Trap #2 Summary need to be revised.
(Rev. 2) Comment has been addressed.
28. Please provide an energy dissipater to the clean water diversion at the south corner to prevent
concentrated runoff.
(Rev. 2) Comment has been addressed.
29. Please provide outlet protection to the outfall on the south side of the proposed site.
(Rev. 2) Comment has been addressed.
30. Please provide elevations to the proposed contours for the sediment traps.
(Rev. 2) Comment has been addressed.
31. It appears that the sediment traps are now designed as basins. This requires the pipes to be
a minimum of 15 ". In addition, outlet protection must be installed at the outfalls of each
pipe.
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