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Surface&Subsurface Contamination Report Page 10 Sandhu Farms Project No. 655.1 August 15, 2012 2.0 SITE DESCRIPTION 2.1 Property Location and Description The Property consists of two agricultural parcels and portions of two others that are contiguous, and have a total area of about 287 acres. The Property occupies almost all of the south half of Section 31 of T2S, R6E, MDB&M. It is situated on the east side of Bird Road and is bounded by Bird Road to the west and I-5 to the east. A private road forms the north boundary and an irrigation ditch is near the south boundary. The Property is operated as part of"Sandhu Farms". The served by septic sewage systems, and an offsite domestic water well, and a Banta Carbona Irrigation District's lined irrigation ditch provides irrigation water. Stormwater is drained internally. The area is shown on the United States Geological Survey topographic map, Vernalis California Quadrangle, California, 7.5-minute series. 2.2 Geologic and Hydrologic Conditions Soils& Geology The Central valley is notable for thick sedimentary deposits which range in age from recent to Eocene and older and which may extend to depths of more than 20,000 feet. These sediments are derived from the Sierra range to the east and the Coast Ranges to the west. The shallow sediments are known as the Tulare Formation. A widespread clay deposit, the Corcoran Clay (or E-clay), divides the upper and lower members of the Tulare Formation. The Tulare sediments lying above the Corcoran Clay are entirely Pleistocene in age. The Corcoran Clay is about 60 feet thick in the Vernalis-New Jerusalem area and it serves as an effective aquitard. It lies approximately 150 to 200 feet below the ground surface. It is believed that most major irrigation and water supply wells are completed below the Corcoran Clay zone. The USDA Soils Conservation Service Soil Survey of San Joaquin County, California. October 1992 soil survey report classifies soil in San Joaquin County. The Survey generally classifies the soils in this area of as part of the Columbia- Temple Association; deep, imperfectly drained soils of the Capay association; moderately well drained fine textured soils of the San Joaquin River flood plain. The specific on-site soil type is known as Capay clay, wet, 0-2% slopes. This is deep, moderately well drained brownish clay soil oveylying a silty clay loam. It is relatively impermeable. 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209)569.0293 Modesto, CA 95356 Fax: (209)569.0295