HomeMy WebLinkAboutSUB200800173 Review Comments Groundwater Assessment 2008-09-17Tier II Groundwater Assessment
TMP 94 -15 and TMP 94 - 16
Application: SUB20080173 — Glenoaks (Lotsl -5) -Final
Groundwater Reviewer: J. Rubinstein
Date: 17 September 2008
Description: 4 divisions — 5 lots
Water Quantity
The Albemarle County Database shows 30 wells within half a mile of the
lot. The wells range from 44 to 630 feet in depth with a median depth of
160 feet. The well yields range from zero to 41 gallons per minute with a
median yield of 4 gallons per minute. This yield is significantly lower than
the median yield for the county of 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) within
two thousand feet of the parcels.'
Buffers
According to the county GIS site, buffers are required buffer along
Limestone Creek and the Rivanna River and their tributaries.2 Buffers are
now required along intermittent streams. Please consult the graphic at the
end of this report to see if there are any changes in what is required to be
buffered.
The parcel is in the Middle Rivanna River watershed which is not a source
for a public water supply.
Site Description
According to the Virginia Department of Mineral Resources 1993 Map,
most of the parcel is underlain by the mylonite of Blue Ridge Complex
' http:// gisweb. deq .virginia.gov /deqims /viewer.htm ?SERVICE= VA_DEQ
2 http: / /gisweb.albemarle.org/
(my). Along the Northwest and in wedge to the south the phyllite and
schist of the Chandler Formation is found. To the southeast is
metagraywacke (CZpm)
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 in which most of two the parcels lies:
The Piedmont Proper unit is characterized by rolling piedmont
topography. The bedrock geology underlying the unit is mapped as
Metagraywacke, quartzose schist and melange. Soils in the unit area
are dominated by the Nason and the Manteo in nearly equal
percentages. Manteo soils are shallow and somewhat excessively
drained. The Manteo soils are formed by the weathered products of
sericitic schists /phyllites on uplands and range in slope from 2 -45 %.
The Nason soil series are deep and well drained and are also formed
in the weathered products of sericitic schist. The Nason soils are
formed on uplands and range in slope from 2 -25 %.
Below is ENSAT's description of the Chandler Unit which lies along the
northwest portion of the parcels:
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
schist/phyllite. The Nason soils are formed on uplands and range in
slope from 2-25%.
LO
LO
LO
7D
0 (D 0 0
M
0
EL m Q� m m
❑ Don
rF
, *- .90:
.ry L
14