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Project No. E8062.WTP Phase I Environmental Site Assessment/Lathrop,CA October 21, 1999 <br /> 2. SITE LOCATION AND DESCRIPTION <br /> 117 <br /> 2.1 Location 4rtJ4 1 <br /> The subject property is located in the western portion of Lathrop, California within the San <br /> Joaquin Valley (see Site Vicinity Map, Figure su jec site consists of 100 acres located <br /> immediately west of the San Joaquin River between Frewert Roa4 and Manilla Road. The <br /> property is currently being used for agricultural purposes. ep4 i11;e <br /> — <br /> 2.2 Topography and Drainage <br /> The topography at the subject site is generally flat at approximately 10 feet above mean sea level <br /> (msl). The local topography slopes gradually to the west. Drainage at the site would therefore <br /> be to the west as well. The San Joaquin River borders the western edge of the property and <br /> carries water to north. The subject site is located within a flood zone. <br /> 2.3 Geology/Hydrogeology <br /> Based on published materials by Wagner, et al. (1990), the materials underlying the site are <br /> considered Pleistocene flood basin deposits (Qdp) consisting of sands, gravel, clays, and silts. <br /> These deposits were formed from former channels, levees, and floodplains associated with the <br /> adjacent San Joaquin River. <br /> The traces of the Corral Hollow and Greenville Faults are situated approximately 18 and 24 <br /> miles to the west of the subject site. Both the Corral Hollow and Greenville Faults are listed as <br /> active by the Alquist-Priolo (AP) Earthquake Fault Zones Act (California Division of Mines and <br /> ` Geology [CDMG], 1994), and are considered strike-slip faults with right-lateral movement. The <br /> subject site is neither located within an AP Earthquake Fault Zone, nor within a Seismic <br /> Hazardous Zone (CDMG, 1997). The California Division of Mines and Geology considers all <br /> areas within 5 kilometers from a active fault to be a Seismic Hazard Zone. <br /> _ Based on data from a recent geotechnical investigation by TERRASEARCH, inc., depth-to- <br /> water beneath the subject site is between 4 to 10 feet below ground surface (bgs). Localized <br /> groundwater probably flows toward the northwest,based on local topography. <br /> — <br /> 2.4 Site Visit <br /> A TERRASEARCH, inc. field geologist visited the site on Monday, October 18, 1999, and made <br /> the following observations: <br /> • The subject site consists of an approximately 100-acre rectangular parcel west of the San <br /> Joaquin River between Manilla Road and Frewert Road in Lathrop, California. The site is <br /> currently used for agricultural purposes. A concrete irrigation pipe is buried along the <br /> .. southern edge of the property with several overflow outlet pipes rising above the ground <br /> — <br /> TERRASEARCH, inc. Page 5 <br /> r <br />