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=GEOCHECe - PHYSICAL SETTING SOURCE SUMMARY <br /> Site-Speclflc Hydrogeological Data*. <br /> Search Radius: 2.0 miles <br /> Location Relative to TP: 1/4-1/2 Mile SE <br /> Site Name: Tracy Defense Depot <br /> Site EPA ID Number: CA4971520834 <br /> Groundwater Flow Direction: Northeast <br /> Measured Depth to Water: 15 feet to 40 feet. <br /> Hydraulic Connection: An aquitard separates the surficial and lower aquifers. <br /> Sole Source Aquifer: No information about a sole source aquifer is available <br /> Data Quality: Information based on site-specific subsurface investigations is <br /> documented in the CERCLIS investigation report(s) <br /> AQUIFLOW® <br /> Search Radius:2.000 Miles. <br /> EDR has developed the AQUIFLOW Information System to provide data on the general direction of groundwater <br /> flow at specific points. EDR has reviewed reports submitted by environmental professionals to regulatory <br /> authorities at select sites and has extracted the date of the report,groundwater flow direction as determined <br /> hydrogeologically,and the depth to water table. <br /> LOCATION GENERAL DIRECTION <br /> MAP ID FROM TP GROUNDWATER FLOW <br /> Not Reported <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: Stratified 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 /> 01996 Slte-speafic h drogeobgi-1 data gathered by CERCLIS Alarts,Inc.,Bainbridge Island,WA.M rights reserved.All or IM information and opinions presented are those of the died EPA reporl(s),which were completed under <br /> a Comprehensive Envkonmental Response Compensation and LiaWlily Wnerhation System(CERCLIS)investigation. <br /> TC931160.3s Page A-3 <br />