Loading...
HomeMy WebLinkAboutSUB201400191 Assessment - Groundwater 2015-05-21TIER II GROUNDWATER ASSESSMENT County of Albemarle Department of Community Development 401 McIntire Road, North Wing Charlottesville, Virginia 22902 sl 434 - 296 -5832 www.albemarle.org /cdd DATE: 01/09/2015 APPLICATION: SUB 2014 -00191 PROJECT NAME: Donald R. Richardson - Family Division TM P: 02700- 00- 00 -039AO 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 Ouantity # of Wells within .5 Miles of Parcel: 2 Range of Depth of those wells: 94.0 to 245.0 feet Range of Yield of those wells: 15.0 to 30.0 gallons per minute (gpm) Median Yield for Wells in County: 6.0 gpm Water Ouality # 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 Hvdrograahy % of Parcel that Contains Required Stream Buffers: 44.5% Watershed of Parcel (Y /N1): Moormans River -Wards Creek (Y) 100.0% Geology Bedrock: Blue Ridge basement complex(Ypg) - pyroxene granulite 100.0% Hydrogeologic Units *: Foothills -II 100.0% If you should have any questions, please contact the Community Development Department at 434 - 296 -5832. A "Y" indicates that the watershed is a water supply watershed. An "N" means that it is not. FILIUI c i - �Iw PIOU UI I rIr vcivv- vv- vv- v.��/iv Tier 2 Groundwater Assessment Site Map Q Subject Parcel LUSTS APP #: SUB 2014 -00191 C Known Water Wells Superfund Sites TM P: 02700- 00- 00 -039AO Water Protection Landfills Ordinance Buffers Map Created by CDD on: 01/09/2015 o eo 160 sao ** *Aerial Imagery from Y2013 * ** Feel 2, *Hydrogeologic Units Defined Taken from the 1213012003 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). 2 3. Figure 2 - Albemarle County Hydrogeologic Unit Map 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 "cappings" 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. Soils within this area dominated by the Hayesville, Ashe and Chester soil series which are moderately deep to deep, and generally well drained. These soils are found on the piedmont upland and foothills of the Blue Ridge Mountain on slopes ranging from 2 -45 %. These soils are formed from weathered granites and meta - granites of the Blue Ridge Basement complex. The Piedmont Foothills area is bifurcated by Hydrogeologic Unit IV (Lynchburg). 3 5. Lynchburg -IV: The Lynchburg unit is characterized by a relatively narrow band that trends in a northeast direction and includes a relatively long segment of the Mechums River valley. Soils within this unit are dominated by the Hazel and to a lesser extent by the Elioak and Glenelg soils. The Hazel soil series are moderately deep and well drained and are formed in the weathered products of metagraywacke sandstone and mica schist. Hazel soils lie on uplands and their slopes range from 7- 45 %. The Elioak soil series are deep and well drained and are formed in the products of weathered micaeous metamorphic rock. Slopes of the Elioak range from 2 -25 %. The Glenelg soils are also deep and well drained and are formed in the weathered products of quartz mica schist. Slopes of the Glenelg range from 2 -45 %. The area is underlain primarily by the Lynchburg Formation and /or the Mechums River Formation which consists largely of metagraywacke, meta sandstone, and graphitic schist. 6. Ragged Mountain -V: The Ragged Mountain unit is characterized by mountainous terrain located in the southwestern portion of the County and is underlain by the metagranitic rocks of the Blue Ridge Basement Complex. The soils in the area are dominated by the Chester, Hayesville, Ashe, and Parker soil series. These soils are derived from weathered granite and granite gneiss and are deep and excessively well drained. These soils range in slope from 2 -45% with some slopes up to 60 percent in the Parker soils. 7. Candler -VI: The Candler unit is underlain primarily by the Candler formation. Bedrock geology includes phyllites and to a lesser degree laminated metasiltstone. Soils underlying the unit 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 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 /phyllite. The Nason soils are formed on uplands and range in slope from 2 -25 %. 8. Newark Basin -VII: 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% deep to moderately deep and well drained. Slopes range from 2 -25 %. 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 much smaller area of the Barboursville Basin located in the northern portion of the County. 9. Piedmont Proper -VIII: The Piedmont Proper unit is characterized by gently rolling piedmont topography. The bedrock geology underlying the unit is mapped as Metagraywacke, quartoze schist, and m6lange. Soils in the unit area are dominated by the Nason and the Manteo in nearly equal percentages. Although these same soils also dominated the Candler unit, it should be noted that the Manteo soils were nearly twice as prevalent as compared to the Nason. Manteo soils are shallow and somewhat excessively drained. The Manteo soils are formed in 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 %. 10. Barboursville -IX: This unit exists in only a small portion of the County at the area where Route 20 enters Orange County. Evidently this hydrogeologic unit was small enough that it did not factor into the ENSAT report and therefore does not have a description like the other units. You can see an unlabeled delineation of this unit in the map (Figure 2) along the northern County boundary near the right -hand side.