HomeMy WebLinkAboutWPO202000054 Correspondence 2021-03-09608 Preston Avenue
P 434.295.5624
Suite 200 F 434.295.1800
T I M M O N S GROUP
Charlottesville, VA 22903 www.timmons.com
March 8, 2021
John Anderson
County of Albemarle
Community Development
401 McIntire Rd
Charlottesville, VA 22902
RE: Monticello WPO — Plan Review - Comment Response Letter
Dear Mr. Anderson:
We have reviewed all of your comments from January 28, 2021 and made the necessary
revisions. Please find our responses to the comments below in bold lettering.
Stormwater Pollution Prevention Plan
1. Submit SWPPP. Please use 12-section county template. Additional comments possible.
A SWPPP has been included with this resubmission.
2. Use new DEQ Registration Statement (SWPPP, Sec. 1, Eff. 01/01/21), which requires off -
site export (fill volume/type/destination) be listed, to be tracked by local administrators
(county), and reported monthly to DEQ.
A SWPPP has been prepared as requested, however given that the land disturbance is well
under 1 acre I do not believe the DEQ registration statement to be necessary as Albemarle
County is the permitting authority under 1 acre. Please clarify if this will be submitted to DEQ?
3. Note: Applicant need not furnish export data (Registration Statement, SWPPP, Sec. 1),
or SWPPP Sec. 6.E./Sec. 8. Information until just prior to pre -construction; in other
words, plan may be approved without this information, but this information is required
just prior to preconstruction. [Sec. 6.E. names individual responsible for PPP measures;
Sec. 8 names SWPPP inspector.]
Acknowledged.
4. Provide PPP Exhibit (SWPPP Sec. 6A) that identifies preliminary location of:
a. Rain gauge
b. Portable sanitary facilities
c. Covered non -hazardous solid waste dumpster, if needed
d. Concrete wash -out draining to trapping device
e. Paved construction entrance w/ spray wash*
*draining to depression / other trapping measure
A PPP Exhibit has been provided in the SWPPP.
ENGINEERING I DESIGN I TECHNOLOGY
SWM Plan:
S. Calculation report / November 23, 2020:
a. Revise VRRM redevelopment .xIs post -developed land cover (p. 5, report):
i. Replace 0.16 ac. Forest / open space land cover with 0.0 ac.
0.16 acres forest/open space has been revised to be 0.0 acres.
ii. Revise managed turf to 0.56 ac. See attached .xIs.
The acreage of managed turf has been revised to be 0.56 acres.
b. Revise Narrative, SWM, Water Quality, p. 3, report, to reflect change at p. 5.
The narrative, SWM, and Water Quality summary have been revised to reflect
the changes in proposed forest/open space and managed turf.
c. Please revise calculation report title pg. to include reference to WPO202000054.
The calculation report has been revised accordingly.
6. C6.0: Revise consistent with revision to calculation report, item 5., above.
Sheet C6.0 has been revised to reflect the changes in proposed forest/open space and
managed turf.
7. C0.0: Revise WPO plan title to include ref. to WPO2020-00054.
The WPO Plan title has been revised accordingly.
8. General: Revise consistent with Engineering review comments on SDP20080006, d.
12/11/20 (attached).
Acknowledged and the WPO plan has been updated to match the Letter of Revision #2
for SDP20080006 as requested.
9. C3.0: Revise Sequence of Installation Phase 1 Note 1 to indicate preconstruction
meeting will take place with Albemarle representative either at community
development office, or via teleconference.
The Sequence of Installation Phase 1 Note 1 has been revised to state that the
preconstruction meeting will take place with an Albemarle representative either at
the Community Development office or via teleconference.
10. C3.2: Recommend stilling measure (lined riprap depression, gravel diaphragm, or other)
to attenuate and calm concentrated flow at low end of DD, and just off pavement at
downslope end of RWD.'
In the phase I E&S plan the parking area is to be used as a staging and storage area for
construction with the asphalt to remain. Super silt fence is provided to control all upstream
disturbance from this area. The right of way diversion was provided as an additional measure
of protection beyond the super silt fence and it directs water towards a protected inlet. Also
the area that drains to the RWD is very small at about 0.04 acres which has a 10year peak flow
of only 0.21 CFS. For all these reasons it is our opinion a stilling measure should not be
necessary and adequate erosion controls are provided.
We have included PDF copies of the plans and calculations for your review. If you have any
questions or comments, please feel free to give me a call at 434.295.5624 or email at
bryan.cichocki@timmons.com .
Sincerely,
B an Cichocki, PE
Project Manager