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' GEOCHECKO - PHYSICAL SETTING SOURCE SUMMARY <br />' GROUNDWATER FLOW VELOCITY INFORMATION <br /> Groundwater flow velocity information for a particular site Is best determined by a qualified environmental professional <br /> using site specific geologic and soil strata data If such data are not reasonably ascertainable, It may be necessary <br /> to rely on other sources of information, Including geologic age identification, rock stratigraphic unit and soil <br />' characteristics data collected on nearby properties and regional soil Information In general, contaminant plumes <br /> move more quickly through sandy-gravelly types of soils than silty-clayey types of soils <br /> IGEOLOGIC INFORMATION IN GENERAL AREA OF TARGET PROPERTY <br /> Geologic information can be used by the environmental professional in forming an opinion about the relative speed <br /> at which contaminant migration may be occurring <br />' ROCK STRATIGRAPHIC UNIT GEOLOGIC AGE IDENTIFICATION <br /> Era Cenozoic Category Stratifed Sequence <br />' System Quaternary <br /> Series Quaternary <br /> Code Q (decoded above as Era System&SerresJ <br /> Geologic Age and Rock Stratigraphic Unit Source P G Schruben, R E Arndt and W J Bawiec, Geology <br /> of the Conterminous U S at 1 2,500,000 Scale-a digital representation of the 1974 P B King and H M Beikman <br /> Map, USGS Digital Data Series DDS- 11 (1994) <br /> DOMINANT SOIL COMPOSITION IN GENERAL AREA OF TARGET PROPERTY <br /> The U S Department of Agriculture's (USDA)Soil Conservation Service (SCS) leads the National Cooperative Soil <br /> Survey(NCSS) and is responsible for collecting, storing, maintaining and distributing soil survey information <br /> • for privately owned lands in the United States A soil map In a sod survey is a representation of soil patterns <br /> in a landscape Soil maps for STATSGO are compiled by generalizing more detailed (SSURGO) soil survey maps <br /> The following Information is based on Sod Conservation Service STATSGO data <br /> I Sod Component Name CLEAR LAKE <br /> Soil Surface Texture clay <br /> Hydrologic Group Class D -Very slow Infiltration rates Soils are clayey, have a high <br /> water table,or are shallow to an impervious layer <br /> Soil Drainage Class Not reported <br /> IHydric Status Soil meets the requirements for a hydric soil <br /> Corrosion Potential- Uncoated Steel HIGH <br /> Depth to Bedrock Min >60 inches <br /> Depth to Bedrock Max >60 Inches <br />' Soil Layer Information <br /> Boundary Classification <br /> Layer Upper Lower Soil Texture Class AASHTO Group Unified Sod Permeability Soil Reaction <br /> Rate(in/hr) (pH) <br /> 1 0 inches 13 inches clay Silt-Clay FINE-GRAINED Max 020 Max 840 <br /> Materials(more SOILS,Silts Min 006 Min 610 <br /> than 35 pct and Clays <br /> • passing {liquid limit <br /> 20D},Clayey 50%or more), <br /> ISoils Fat Clay <br /> TC0973142 1 s Page A-4 <br />