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HomeMy WebLinkAboutSUB200800276 Review Comments Groundwater Assessment 2008-11-14Tier II Groundwater Assessment TMP 26 -56 Application Number: SUB200800276 Joe Jones - Rural Division Groundwater Reviewer: J. Rubinstein Date: 14 November 2008 Description: 1 division — 2 lots Water Quantity The Albemarle County Database shows 38 wells within half a mile of the lot. The wells range from 61 to 705 feet in depth with a median depth of 200 feet. The well yields range from 0 to 40 gallons per minute with a median yield of 6.5 gallons per minute. The well on the property is listed as having a depth of 185 feet and a yield of 6 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 25 — 56.1 Buffers According to the Albemarle County GIS site, a required buffer bisects the parcel .2 The southern portion of the property including Lot 1 is in the Ward Creek Watershed. The bulk of the property is in the Moorman River Watershed. At the northern end of the property, it dips into the water for the Doyles River. All these watersheds contribute to South Fork Rivanna Reservoir. The property is not within the buffer for the 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, most of the property is in the mylonite (my), charnockite (Yc), and pyroxene granulite (Ypg) of the Blue Ridge Basement Complex. The western portion of the property is in the metasedimentary rock of Swift Run Formation (Zsr). 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.