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1 <br /> • GEOCHECKS - PHYSICAL SETTING SOURCE SUMMARY <br /> 1 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 sod <br /> characteristics data collected on nearby properties and regional soil reformation In general, contaminant plumes <br /> move more quickly through sandy-gravelly types of soils than silty-clayey types of soils <br /> 1 <br /> GEOLOGIC 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 /> I <br /> Era Cenozoic Category Stratifed Sequence <br /> System Quaternary <br /> Series Quaternary <br /> Code Q (decoded above as Era System&Senes) <br /> Geologic Age and Rock Stratigraphic Unit Source P G Schruben, R E Arndt and W J Sawiec, 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) Sod 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 /> I in a landscape Sail maps for STATSGO are compiled by generalizing more detailed (SSURGO)soil survey maps <br /> The following information is based on Soil Conservation Service STATSGO data <br /> Soil Component Name CLEAR LAKE <br /> Soil Surface Texture clay <br /> I 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 /> Sod Drainage Class Not reported <br /> Hydric Status Soil meets the requirements for a hydric sod <br /> Corrosion Potential- Uncoated Steel HIGH <br /> I <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 Soil Permeability Soil Reaction <br /> Rate(in/hr) (pH) <br /> 1 0 inches 13 inches clay Silt-Clay FINE-GRAINED Max 0 20 Max 8 40 <br /> Materials(more SOILS,Silts Min 0 06 Min 610 <br /> than 35 pct and Clays <br /> passing No (liquid limit <br /> 200),Clayey 50%or more) <br /> Soils Fat Cla <br /> TC0973142 1s Page A-4 <br />