HomeMy WebLinkAboutSUB200800205 Review Comments Groundwater Assessment 2008-08-27Tier II Groundwater Assessment
TMP 26 -49
Application Number: SUB200800205 Dennis Morris (Lots 1 & 2) — Final
Groundwater Reviewer: J. Rubinstein
Date: 27 August 2008
Description: 1 division — 2 lots
Water Quantity
The Albemarle County Database shows 13 wells within half a mile of the
lot. The wells range from 61 to 305 feet in depth with a median depth of
193 feet. The well yields range from 1 to 20 gallons per minute with a
median yield 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 parcel.'
Buffers
According to the Albemarle County GIS site and as shown on the plat, a
buffer is required by the Water Protection Ordinance along the southern
boundary of Lot 2.2 The parcel is in the Moormans River Watershed which
is a portion of the watershed for the South Fork Rivanna Reservoir, a public
water supply. It is not within the reservoir's buffer.
Site Description
According to the Virginia Department of Mineral Resources 1993 Map,
most of the parcel is in the mylonite of the Blue Ridge Basement Complex
(my). The southwest corner of Lot 1 is in 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.
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