HomeMy WebLinkAboutWPO202200005 Assessment - Environmental 2022-08-31SHIMP ENGINEERING, P.C.
Design Focused Engineering
June 16,2022
David James
County of Albemarle Community Development
401 McIntire Rd, North Wing
Charlottesville, VA 22902
RE: Soil Test Report for WPO202200005 Castalia Farm Winery
Dear David,
This report is in response to comment C.5 from your comment letter dated May 19, 2022 for
WPO202200005. In order to verify the suitability of the proposed locations for the bioretention basins at
Castalia Farm Winery, soil borings were taken at each of the three bioretention basin locations to ensure
2' bedrock separation (C.5.a) and 2' seasonal high water table separation (C.5.b). The supplementary
material attached indicates the existing grade at each basin, the bottom of the test pits, and proposed
elevation of the bottom of the bioretention basins. The test pits were made on 6/10/22 and inspected on
6/14/22. At bioretention basins # 1 and #2, no rock was found. At bioretention basin #3, some rocks were
found approximately 3' below existing grade. The depth of the test pit could not exceed 4' using a hand
auger due to the presence of rock. Upon review during the follow up inspection on 6/14, no groundwater
was found at any of the three test locations. Based on this information, we believe the bioretention basin
# 1 and #2 locations to be suitable.
The presence of rock at bioretention basin #3 gives us reason to reassess the stormwater treatment
at this location. The current design for the bioretention basin has a bottom of stone elevation of 542.00
which is the same elevation that rock was found at this location. A detention pond will replace the
bioretention basin and the facility will be located farther away from the stream buffer. Detention ponds do
not have the same 2' separation requirement.
If you have any questions or concerns about these revisions, please feel free to contact me at
chris@shimp-en ing eering com or by phone at 434-227-5140.
Regards,
Chris Marshall, EIT
Staff Engineer
Shimp Engineering, P.C.
912 E. High 51 Charlottesville. VA 22902 1434.227 5140 1 shim0-engmeering.com
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