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Home My WebLink AboutSUB201500177 Assessment - Groundwater 2015-11-24 r" TIER II GROUNDWATER ASSESSMENT County of Albemarle Department of Community Development 401 McIntire Road, North Wing -=.- F Charlottesville,Virginia 22902 434-296-5832 I www.albemarle.org/cdd DATE: 11/24/2015 APPLICATION: SUB 2015-00177 PROJECT NAME: William O. & Irma Mahone - Family Division TMP: 08900-00-00-062B0 The pending development on the property affected by the above referenced application number meets criteria outlined in Albemarle County Code Article IV - Groundwater Assessments to warrant a Tier 2 Groundwater Assessment. The following assessment uses the best available sources to outline the various groundwater conditions that could have an impact on this property. Water Quantity # of Wells within .5 Miles of Parcel: 18 Range of Depth of those wells: 0.0 to 350.0 feet Range of Yield of those wells: 0.0 to 50.0 gallons per minute (gpm) Median Yield for Wells in County: 6.0 gpm Water Quality # of Leaking Underground Storage Tanks (LUSTs) within 2000 Feet of Parcel: 0 # of Superfund sites within .5 miles: 0 # of Landfills within .5 miles: 0 Hydrography % of Parcel that Contains Required Stream Buffers: 8.2% Watershed of Parcel (Y/N1): Moores Creek (N) 100.0% Geoloay Bedrock: Blue Ridge basement complex(Ybg) - porphyroblastic biotite plagioclase augen gneiss 96.8% Lynchburg Group(Zlf) - fanglomerate 3.2% Hydrogeologic Units*: Ragged Mountain-V 100.0% If you should have any questions, please contact the Community Development Department at 434-296-5832. 1 A"Y" indicates that the watershed is a water supply watershed. An "N" means that it is not. 1 Z N slluPUe, • saa44ng aaueulpa0 ■ ***£TOZA wo.0 Aaa6ewI �epol/*** uol�aaloJd aa�eM o STOZ/bZ/TT :uo cap Aq pa;eaaD deW #` v, saals punjaadns slla/N aaleM uraou� .1' r 0 08290-00-00-00680 •dwl - � 8 Slsm ® laaaed 1aafgnS p #f ' aorr leej , I 0Z, 08Z OK 0 dew avis luaLussassy JaleMpuno.19 II aa!J w.. - . 8 asp-s8 z -s *''''':. '''' ' . j'i '':''''' ''' 7 F' *• 4 9-. . Ma ., 486-68 . •Zr-68 ' 90L 4 -, Willt T. r)\ a 69.68, 38.6-68 l'''' � 1F ..r ' ° ' 4r-'. -' - ' .,;,17,te - ",,•-, *" ,- .,,,,.,.. 4 ... _ ..., . . , .., , r 829-68 `-' r ' �� ir, r s/R .'ATE}" J:0-; ' -/ . , _ 0 ' / V6.-68 / / s 1011.-68 ' / / /_ . . '.E' *Hydrogeologic Units Defined Taken from the 12/30/2003 Albemarle County Hydrogeologic Assessment Phase II— Groundwater Availability and Sensitivity Assessment with Proposed Groundwater Assessment Standards. Prepared by ENSAT Corporation, Culpeper, VA. The process of investigating groundwater availability at the County-wide scale involved identifying distinct hydrogeologic units and comparing the units based on groundwater availability characteristics for which data could be obtained. Each hydrogeologic unit shares some common characteristics with regard to geology, soils, and topography, although there is quite a bit of variability within each unit. Nine hydrogeologic units were identified across the County, as follows, and as shown on the Albemarle County Hydrogeologic Unit Map (Figure 2). Figure 2 - Albemarle County Hydrogeologic Unit Map 1. Blue Ridge West-IW: This unit lies primarily on the steep eastern slopes of the Blue Ridge Mountains and is dominated by the Myersville and Parker Soils, and to a lesser extent the Chester. Slopes range from 2-60%. These soils are residual in nature. The Myersville soils are derived from weathered volcanic metamorphic rocks (greenstone) and Parker and Chester soil series are derived from weathered granite and granite gneiss. These soils are considered to be relatively deep and well drained. 2. Blue Ridge East-IE: The Blue Ridge East unit overlies volcanic greenstone rock and represents the eastern limb of the Blue Ridge Anticlinorium. The area is characterized by the presence of a prominent ridge and trends generally northeast within the otherwise rolling piedmont landscape. Portions of this ridge are known locally as Green Mountain, Carters Mountain, and the Southwest „„�,,� �,,,�„„h", Mountains. This area is dominated by the Rabun IF RIw RId�r:,: and Myersville soils and to a lesser extent, the '� Alplal"" I„ N.dnunl towl,Jl, Catoctin. The Rabun soil series is deep and well n.l:,- �. \' R,u"l Alm„+u, drained and like the Myersville soil series is VI.Candle, vn n..r„rk Bann VIII-Reamed formed from weathered greenstone. The Proper Catoctin soil series is considered to be Ab.nar►C"wrp NlM"ptik Y7 ■ moderately deep and well drained and is also „ .bR,,,A,,,,L "� r formed from weathered greenstone. (L,.,:L"."IR.L"h,AVayrl� �' _(,,,.2.M.*,un R.l,ti,.-3.,1.61111, :sow 3. Colluvial Fans-II: The Colluvial Fan unit lies at `(Lii3 ww".R�,„..,......v - -_'' the base of the eastern slopes of the Blue Ridge M "��`� """"'"" °""°•""• Mountain and is characterized by relatively 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%. Bedrock geology consists largely of metagranitic rock of the Blue Ridge Basement Complex and metasedimentary, metaconglomerate and phyllite of the Swift Run Formation. The accumulation of transported soils (colluvial and alluvial) can form "tappings"over residual soils and parent material, which can add to the overall thickness of the overburden. 4. Piedmont Foothills-III: The Piedmont Foothills unit is characterized by rolling upland to relatively steep topography. 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