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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 /> r <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(NOSS)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: SAN JOAQUIN <br /> Soil Surface Texture: silt loam <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: Moderately well drained. Soils have a layer of low hydraulic <br /> conductivity, wet state high in the profile. Depth to water table is 3 <br /> to 6 feet. <br /> Hydric Status: Soil does not meet the requirements for a hydric soil. <br /> Corrosion Potential- Uncoated Steel: MODERATE <br /> Depth to Bedrock Min: >Winches <br /> Depth to Bedrock Max: >Winches <br /> TC01097062.3r Page A-4 <br />