HomeMy WebLinkAboutSUB200800100 Review Comments Groundwater Assessment 2008-04-16Tier II Groundwater Assessment
TMP 26 -42B
Application Number: SUB200800100
Groundwater Reviewer: J. Rubinstein
Date: 16 April 2008
Description: 1 division — 2 lots
Water Quantity
The Albemarle County Database shows eight wells within half a mile of the
lot. The wells range from 78 to 305 feet in depth with a median depth of
265 feet. The well yields range from three to forty gallons per minute with a
median yield of four and a half gallons per minute. The well on the
property is listed as having a yield of four gallons per minute and depth of
78 feet.
Water Quality
As shown on the Virginia Department of Environmental Quality (DEQ) GIS
website, there are no leaking underground storage tank sites (LUST) within
two thousand feet of the parcel.'
Buffers
According to the Albemarle County GIS site, there are no required buffers
on the property.2 The parcel is in the Doyles River Watershed which is
within the public water supply watershed for the South Fork Rivanna
Reservoir. It is not within the reservoir's buffer.
Site Description
According to the Virginia Department of Mineral Resources 1993 Map, the
parcel is in the metasedimentary rocks of the Swift Run Formation (Zsr).
' http: / /gisweb.deq.virginia.gov /deqims /viewer.htm ?SERVICE= VA_DEQ
2 http: / /gisweb.albemarle.org/
In a groundwater assessment done for the Albemarle County, ENSAT
Corporation divided the county into `hydrologic units'. Below is ENSAT's
description of the unit containing the parcel:
The Colluvial Fan unit lies at the base of the eastern slopes of the Blue
Ridge Mountain and is characterized by relative steep drainage swales
that extend to more gradual sloping conditions. The area includes a
series of intermittent drainages that include ephemeral drainage ways.
Many of the intermittent drainages become perennial streams as this
area includes stream bottom valleys. A significant portion of the unit
area consists of transported soils including the Braddock and
Thurmont. These soils are formed in colluvial and alluvial materials
found on colluvial fans and terraces and are the product of weathered
granite, granodiorite, granite gneiss, and greenstone. Both of these
soil series are deep and well drained with slopes ranging from 2 -25 %.
Residual soils including the Hayesville and the Chester are also
abundant. These soils are also deep and well drained and are formed
on upland slopes from weathered products of granite and granite
gneiss. Slopes of these soils typically range from 2 -45 %. The
accumulation of transported soils (colluvial and alluvial) can form
"cappings" over residual soils and parent material, which can add to
the overall thickness of the overburden.