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GEOCHECK-" - 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 /> 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 /> .. Era: Cenozoic Category: Stratifed Sequence <br /> System: Quaternary <br /> Series: Quaternary <br /> .� Code: Q (decoded above as Era,System&Series) <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 soil 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 Soil Conservation Service STATSGO data. <br /> Soil 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 /> Hydric Status:Soil meets the requirements for a hydric soil. <br /> ` Corrosion Potential-Uncoated Steel: HIGH <br /> Depth to Bedrock Min: >Winches <br /> ` Depth to Bedrock Max: >Winches <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: 6.10 <br /> than 35 pct. and Clays <br /> passing No. (liquid limit <br /> 200),Clayey 50%or more), <br /> Soils. Fat Clay. <br /> TC01371150.8r Page A-4 <br />