HomeMy WebLinkAboutSUB200800122 Review Comments Groundwater Assessment 2008-05-13Tier II Groundwater Assessment
TMP 131 -6
Application: SUB20080122 - Pollard Property - Family Division
Groundwater Reviewer: J. Rubinstein
Date: 13 May 2008
Description: 1 division — 2 lots
Water Quantity
The Albemarle County Database shows 15 wells within half a mile of the
lot. The wells range from 54 to 280 feet in depth with a median depth of
110 feet. The well yields range from 3 to 40 gallons per minute with a
median yield of 10 gallons per minute. Our data layer shows the well on the
eastern lot is 200 feet deep and yields 3 gallons per minute. The well on the
parcel is shown at 140 depth and 30 gallons per minute yield.
Water Ouality
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 county GIS site, there is a required buffer along an
intermittent stream that runs through the northwest quarter of the property.2
The parcel is in the Totier Creek watershed which feeds the public water
supply of Totier Creek Reservoir.
Site Description
According to the Virginia Department of Mineral Resources 1993 Map,
most of the parcel is on the metagraywacke (CZpm), conglomerate (c)
sandstone, siltstone and shale (ss) of the Newark Basin Supergroup.
' 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'. The parcel falls in
two of these units. The western portion of the tax map 131 -6 falls in the unit
described below:
The Newark Basin unit is characterized by low relief topography,
which exists over Mesozoic basin geology. The unit is underlain by
the Newark Supergroup which consists of sandstones, siltstones and
shales. Soils within this area are dominated by the Totier, Rapidan,
and Penn series. The Totier soil series are deep and well drained and
are formed from weathered Triassic red shale. These soils are found
on uplands and range in slope from 2-15%.
The Rapidan soil series are also deep and well drained and are formed
in weathered products of Triassic conglomerate. The Rapidan, like
the Totier, are found on uplands and range in slope from 2 -25 %. The
Penn series are moderately deep and well drained and are formed
from the weathered products of Triassic red shale. The Newark Basin
hydrogeologic unit includes the Scottsville Basin located in the
southern portion of the County and a much smaller area of the
Barboursville Basin located in the northern portion of the County.
The eastern fifth of the parcel including Lot G falls in the unit described
below:
The Piedmont Proper unit is characterized by rolling piedmont
topography. The bedrock geology underlying the unit is mapped as
Metagraywacke, quartzose schist and m6lange. 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 %.
► -%
�qz
vk
-i
AIL