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2.0 EXISTING SITE,GEOLOGIC AND GROUNDWATER CONDITIONS 2.1 Existing Site Conditions and Improvements The Caltrans Tracy Maintenance Station is located at 2005 Krohn Roan in the San Joaquin, California. The roughly 1.6-hectare (4-acre) triangular-st.aped parcel is bounded to the north by I Ph Street,to the east by Corral Hollow Road and to the southwest by Krohn Road. The Site consists of an active maintenance facility for the storage and repair of vehicles and equipment used for the maintenance of California highways. Existing improvements include perimeter fencing, office, equipment building, a gas house, a wash rack, a warehouse and loading dock, material storage bins, a wood storage shed and storage containers. The existing site improvements are depicted on the Site Plan,Figure 2. 2.2 Soil and Geologic Conditions Information concerning the general soil and geologic cor ditions beneath the Site was obtained from a review of previous reports prepared for the Site and the previously referenced CDMG and soil survey documents. The Site is located within the San Joaquin Valley, approximately 5 km(3 miles) southeast of the Tracy (Stockton) Fault Zone and 6.5 km (4 mules) northeast of 1he Black Butte Fault. The Tracy (Stockton) Fault Zane and the Black Butte Fault are not referenced as lquist-Priolo fault zones or as Class A or B faults and do not likely present a hazard to the Site. The Sz n Joaquin River,Tom Paine Slough and Old River intersect approximately 10 km(6 miles) northeast o the Site along with several canals. The Site is underlain by Quaternary-aged unconsolidated sediments that were deposited during flood stages of major streams in areas between natural stream Ievees aiid alluvial fans. These deposits are locally known as the Pleistocene-aged Modesto Formation co m rised of brown to gray sand and silt on a westward sloping surface. A portion of the CDMG geologic map depicting the Site is presented on Figure 3. Review of the soil survey indicates that the surflcial soils are comprised of the Sorrento silty clay on gently sloping alluvial fans. These soils are typically well drained and have slight erosion. These soils are pale or light brown,deep and uniform throughout. The parent material consists of sedimentary rock sources that contain slight amounts of lime. Soils encountered during drilling activities of the domesti well located in the northeast corner of the Site consisted of sand clay and gravel. r Project No.S9225-06-146 -5 - May 25,2001