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• Quarterly Summary Report , for The Pestana Trust Property 275 Grant Lane Road, Tracy, CA SJCo PHS/EHD Site #2435 SITE LOCATION AND DESCRIPTION The subject site is located in an area of mixed commercial , residential , and light-industrial usage in the northeastern portion of the City of Tracy (San Joaquin County) , CA. It is a rectangular parcel consisting of approximately 17 ,070 square feet . The site as paved in asphalt and contains one, single-story building that originally housed the office and service bays for a retail fuel service station. In recent years , the building has been used by a variety of small , repair and rental businesses . The site, presently vacant and unused, is surrounded by a sax foot high ware mesh security fence. SITE GEOLOGY AND GEOHYDROLOGY • The Water Works Corp. (a former environmental consultant to the property owner) reported an a September, 1991 document prepared for property also located at East Street and Grant Lane Road that the subject intersection is located on. (essentially) level terrain underlain by Pleistocene and Holocene age flood plain deposits composed of sediments similar to, and probably conformable to underlying deposits of alluvium and the Tulare formation. The flood plain deposits are light to dark--brown and grey clay, salty sand, and organic materials with locally high concentrations of salt and alkali . Stream channel deposits of sand and gravel are also present . Groundwater as less than ten feet below grade throughout most of the Tracy area. Groundwater flow as generally to the north. The flood plain deposits of the shallow water bearing zone have well developed soil profiles and poor permeability. The base of this zone as poorly defined and probably as from five to twenty feet below ground surface. OVERVIEW OF PAST ENVIRONMENTAL COMPLIANCE ACTIVITIES PERFORMED AT THE SITE • In their March, 1993 Report of Findings , Applied Environmental Solutions , Inc . (AES) of San Jose, CA