HomeMy WebLinkAboutWPO202100045 Correspondence 2021-12-06December 6, 2021
MEMORANDUM
To: Mr. Matt Wentland, PE
County of Albemarle, Virginia
From: Mr. Eric Woolley, PE
Woolley Engineering
Regarding: Crutchfield Corporation Warehouse Expansion WPO202100045 (TM 32 P 9C)
VSMP/WPO Plan
Responses to comments from County Staff
With this memo, we are responding to the comments that were directed to our office following the
review of our VSMP/WPO plan for the Crutchfield Corporation Warehouse Expansion project
located at 1540 Quiet Acres Lane. The comments were received in written format and dated
September 23, 2021. Below, we have provided our responses to the correlated comments as
numbered on your memo.
A. Stormwater Pollution Prevention Plan (SWPPP)
1. The SWPPP containing a Registration Statement is attached to this memo. Signatures for
the Registration Statement, Delegation of Authority, and Certification of SWPPP will be
provided prior to plan approval.
B. Pollution Prevention Plan (PPP)
1. A pollution prevention plan is now included within the SWPPP document.
C. Stormwater Management Plan (SWMP)
1. Reference to this plan being an amendment to a previous plan have been removed from
the relevant plan sheets.
2. The calculation to demonstrate compliance with the Energy Balance can be found in the
Engineering Calculation Booklet attached to this memo. The point of analysis for the
Energy Balance Equation was taken in the natural channel located directly downstream
of the existing extended detention basin.
3. The grades for the basin have been revised to meet Albemarle County acceptance. A 3.5'
tall retaining wall has been added to the basin area to allow for a 3:1 side slope for most
of the basin. Per correspondence with County Engineering on October 11, 2021, the
County has agreed that the existing embankment and standpipe structure can be
preserved even though the existing slopes are greater than 3:1.
4. Stormwater Management As -Built requirement guidance has been added to the site plan
on plan sheet C6.1.
5. Gravel diaphragms have been added to the plan as a secondary pre-treatment option for
biofilters #2A and #2B in order to meet DEQ Specifications for a Level 2 biofilter.
WOOLLEY ENGINEERING 210 5th Street NE (434) 973-0045
Charlottesville, Virginia 22902
WGGLLEY ENGINEERING
Gutter system leaf screens have been added as a secondary pre-treatment measure for
biofilter #1 to meet DEQ Specifications for a Level 2 biofilter.
6. There is a proposed forebay located near the entrance along Dickerson Road. This
forebay is intended to pre -treat drainage from the existing parking lot on -site prior to
entering the conveyance system and ultimately entering the extended detention basin.
The adjacent properties have stormwater facilities on -site to treat their stormwater prior
to entering our stormwater conveyance system. The required pre-treatment forebay
storage for our extended detention basin as defined under the 2011 DEQ Specification
# 15 totals 3,033cf of storage. This storage is being met by pre -treating a portion of the
existing parking lot via the proposed forebay close to Dickerson Road, pre -treating the
proposed parking lot via the forebay storage to be utilized for biofilters #2A and #2B,
and pre -treating a portion of the existing parking lot and a portion of roof drainage via
the proposed forebay to be utilized for biofilter #1.
7. The landscaping plan has been added to the plan set.
D. Erosion and Sediment Control Plan (ESCP)
1. A narrative has been added to each E&S plan to clarify the order of work.
I hope that these responses, in combination with the revised site plan have satisfied the deficiencies
as noted in your comment memorandum. Please do not hesitate to call with any questions or
concerns. Thank you for your time and consideration.
Sincerely,
Eric Woolley, PE
Attached: (1) Electronic PDF Copy of the Revised VSMP/WPO Set
(1) VSMP Application
(1) Revised Stormwater Pollution Prevention Plan
(1) Revised Engineering Calculation Booklet
Cc: Bill Crutchfield, Crutchfield Corporation
Bill Adams, Train Architects