HomeMy WebLinkAboutSUB200800297 Review Comments Groundwater Assessment 2008-12-17Tier II Groundwater Assessment
TMP 40 -47
Application Number: SUB200800297 Billy Wagner - Rural
Groundwater Reviewer: J. Rubinstein
Date: 17 November 2008
Description: 4 divisions — 5 lots
Water Quantity
The Albemarle County Database shows eight wells within half a mile of the
property. The wells range from 55 to 205 feet in depth with a median depth
of 172 feet. The well yields range from 5 to 60 gallons per minute with a
median yield of 15 gallons per minute. The median yield for the Albemarle
County is 7 gallons per minute.
Water Quality
As shown on the Virginia Department of Environmental Quality (DEQ) GIS
website, there are no leaking underground storage tank sites (LUST) on tax
map 40 — 47.1
Buffers
According to the Albemarle County GIS site and as shown on the plat, there
is a required buffer along the intermittent stream that bisects the property.
Not shown on the plat but shown on the County's GIS site is the incursion of
a required buffer from the property to the north into Lot I by approximately
forty feet.'
The parcel is in the Beaver Creek Watershed which feeds the public water
supply from Beaver Creek Reservoir.
1 http: // gisweb. deq .virginia.gov /deqims /viewer.htm ?SERVICE= VA_DEQ
2 http: / /gisweb.albemarle.org/
Site Description
According to the Virginia Department of Mineral Resources 1993 Map, the
property is underlain with the pyroxene granulite of the Blue Ridge
Basement Complex (Ypg).
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 most of 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.