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Report: Groundwater-quality Monitoring—September 11,2001: 7500 West Eleventh Street, Tracy, CA. Page 2 Mr. Carl B. Navarra and Mrs. Annamae F. Navarra, et ux (the Navarras) purchased the property on October 31, 1979 from Ms Meridall Sue Tiago, the window of Joseph L. Tiago, Jr. In 1980, Jack Anastasio and Jim Meservy leased the property. For the next two years it was leased from the Navarras by Charles L. Profito (d.b.a. C & M Truck Service). Jeri Fisher (d.b.a. Tracy Auto/Truck Plaza) leased the property from January 1, i; 1983 until January 31, 1992. Starting on February 15, 1992, the property was leased by Mel Bokides Petroleum, Inc. (Bokides), and was subleased to Mr. Jodha Singh Gill and Mrs. Tirath Kaur Gill, et ux (the Gills), who operated the Olympian Service Station on = the site. That lease and sublease were relinquished by Bokides and the Gills,respectively, 1 in late 1998, and the Olympian station ceased operation. No fuel dispensing or service station operations have been conducted on the site since that time (The San Joaquin Company 2001 c). The restaurant on the property remains in operation and is leased from the Navarras by Able Manilla Mendoza and Guadeloupe Contrecias, et ux, (the Mendozas), who do business as the Casa Mendoza restaurant. In 2000, the Mendozas leased the rest of the site and plan to expand their business on the property. On December 9, 1998, eight underground fuel storage tanks and 6,000 linear feet of f associated piping were removed from the property under the permit and oversight of the SJCPHS (Dietz Irrigation 1999). The former locations of the fuel tanks are shown on Figure 2. When the tanks were removed, it was found that fuel hydrocarbons had leaked from underground piping beneath the fuel pump islands of the former fueling station. The former locations of the fuel pump islands are also shown on Figure 2. 'F= 1 �' y 1.4 Geology and Hydrogeology The subject property and the surrounding area are situated on level terrain on the distal, northern slope of an alluvial fan. The underlying alluvial sediments are of Quaternary to Recent age. The site and the immediately adjacent property along the south side of West Eleventh 3 Street and the west side of Chrisman Road have been extensively excavated and backfilled during prior filling station construction and remodeling, utility installation, and highway expansion. The first several feet beneath the surface of the site are composed of multiple layers of bituminous macadam, concrete slabs and random fill. Beneath the paving and fill, the soils are composed of interbedded clays, silts and sands. These materials have been deposited in a complex lenticular form composed of relatively low permeability clays and silty clays inter-bedded with permeable silts and sands. The sizes of individual permeable lenses vary from relatively large features having considerable areal extent to small, -- localized lenses of limited extent and thickness. In some instances, these lenses merge into each other to form semi-continuous permeable strata within the less permeable sic i �_ J