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' 2.1 Facility Setting and History GEOMATRIX ' The Facility is located approximately 1.4 miles east of the Sacramento River in Stockton, California and comprises about 4.6 acres (Figure 1). The Facility and the majority of the surrounding properties are zoned for light or heavy industrial use. The San Joaquin River and Stockton Regional Waste Water Disposal Ponds are located approximately 3,000 and 3,500 feet west of the Facility, respectively. The Facility has been owned by the Volpi family of Stockton, California, since its development from farm land into a commercial facility. From 1955 to 1970, the Facility was leased to the John Taylor Fertilizer Company doing business as the Bob Mercer Chemical Company (BMC). BMC constructed a ' multipurpose warehouse on the property and used it for storing and distributing agricultural chemicals (Figure 2). ' In 1970, the lease was transferred to the Associated Farm Supply Company, a subsidiary of OCC ' (TreaTek, 1995). In 1975, OCC acquired an additional 1-acre parcel adjacent to the original Facility southern boundary. Until that time, chemical application equipment had been rinsed in an unlined wash pond area located in the southwest comer of the original parcel of land. In 1975, the rinse pond was ' replaced with a concrete wash slab in the southeastern comer of the newly acquired land (Figure 2). The concrete wash slab directed the rinse water to flow inside the property's southern fence line to an ' unlined evaporation ditch along the western fence line. In 1981, a zero-discharge washdown and spill containment facility was constructed at the southwestern comer of the Facility to replace the older wash slab. During OCC's occupancy, all empty containers apparently were stored on the open ground along ' the eastern fence line near the center of the property. OCC continued using the Facility for storing, blending, and distributing various agricultural fertilizers and pesticides until 1982 (TreaTek, 1995). In 1982, the Facility lease was transferred to the J. R. Simplot Company (Simplot), which conducted ' similar operations there until 1984. From 1984 to 1993, the lease was assumed by the PureGro Chemical Company (PureGro), which used the Facility for storing and distributing agricultural fertilizers and pesticides. PureGro ceased operations in 1993. The property is currently fenced and ' includes two buildings, one of which includes an office, warehouse, shop, and awning; the other con- sists of a wash rack facility, as shown in Figure 2 (TreaTek, 1995). A portion of the Facility is currently occupied by a trucking company. ' 2.2 Previous Investigations In 1986 or 1987 (historical information provides conflicting dates), Western Meter, on behalf of PureGro, removed a single underground diesel tank from the vicinity of the empty storage area. One ' shallow groundwater monitoring well, currently designated MW-5, was subsequently installed at the location of the excavation; however, there is no record that soil samples from the tank removal or water ' samples from the well installation were collected (GAS, 1993). In March 1990, Weston Designer/ cwxohrnaxsmoocuwn�esva�n� 2