HomeMy WebLinkAboutSUB200700286 Review Comments Groundwater Assessment 2008-10-16Tier II Groundwater Assessment
TMP 128A2 - 3
Application Number: SUB200700286 Gillispie Development — Preliminary
Groundwater Reviewer: J. Rubinstein
Date: 16 October 2008
Description: 3 divisions — 4 lots
Water Quantity
The Albemarle County Database shows 27 wells within half a mile of the
lot. The wells range from 100 to 330 feet in depth with a median depth of
205 feet. The well yields range from zero to 25 gallons per minute with a
median yield of 3 gallons per minute. The median yield for wells county-
wide is 7 gallons per minute.
Water Quality
As shown on the Virginia Department of Environmental Quality (DEQ) GIS
website, there are five leaking underground storage tank sites (LUST) within
two thousand feet of the parcel.' Therefore Section 500 through 503 of
Albemarle County Code requires that the well be tested for the volatile
organic compounds Benzene, Toluene, Ethylbenzene and Xylenes before a
building permit can be issued. 2
Buffers
As of 6 February 2008, 17- 317(B) requires buffers on intermittent streams
in the rural area. According to the county GIS site, there is an intermittent
stream near the northern boundary of the property.3 Since this application
predates the ordinance, no buffer is required. But any subsequent
application, including those for building permits and site plans, will require a
buffer along the intermittent stream. This buffer which covers portions of
lots 1 and 2 is show on the attached diagram.
1 http: // gisweb. deq .virginia.gov /deqims /viewer.htm ?SERVICE= VA_DEQ
2 http: / /www.albemarle.org /department. asp ?department= ctyatty &relpage =2784
3 http: / /gisweb.albemarle.org/
Most of the parcel is in the watershed for Ballinger Creek. The north east
corner of the parcel is in the watershed for Totier Creek Reservoir, a public
water supply.
Site Description
According to the Virginia Department of Mineral Resources 1993 Map, the
bedrock beneath the parcel is in the phyllite and schist of the Chandler
Formation (Cca).
In a groundwater assessment done for the Albemarle County, ENSAT
Corporation divided the county into `hydrologic units'. Below is ENSAT's
description of the Chandler Unit which contains the parcel:
Soils underlying the area are dominated by the Manteo and Nason
series. Manteo soils are shallow and somewhat excessively drained.
The Manteo soils are formed in the weathered products of sericitic
schistlphyllite. The Nason soils are formed on uplands and range in
slope from 2-25%.
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