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:x <br /> Harken Marketing Company of California <br /> Location 4100966 <br /> Page 2 <br /> November 22,1991 <br /> 2.0 BArKGROUND INFORMATION <br /> 2.1 Site Description and Background <br /> The site is located at 2537 Waterloo Road.Stockton,California(Figure 1). Reportedly,four <br /> rch 1990(HMCC <br /> ` underground storage tanks were removed be ow thehe ite In forme�B 000-gallon gasoline plank <br /> 1991). Confirmation samples, collected m, In addition,a soli <br /> location,reportedly contained TPH concentrations of 2,500 and 2.900 pp m TPH. Based <br /> ly contained <br /> sample collected below the land CoantPEnvirdonmental Heali(siCEH) required a <br /> on these an, <br /> siysis results,the San Joaquin <br /> preliminary site assessment to be performed. <br /> 3.0 GEOLOGIC SETTING <br /> 3,1 Reglonal and Site GeologY <br /> Stockton lies in the San Joaquin Valley which is a north-south trendistat ran <br /> ng s bounded <br /> or) <br /> s and the west by vaso <br /> hin <br /> the east by the Sierra Nevada Mountainage alluvial sediments <br /> the Stockton area, the valley floor consists of Quaternary g <br /> deposited by the San Joaquin River and Its tributaries. Today,the nearest body of surface <br /> water(a canal)Is approximately one-half mile northeast of the site. <br /> The site rests at an elevation of approximately 25 feet above mean sea level which places <br /> The Son quin <br /> the site approximately 20 feet above the present San Joaquin er' the 5 e waapart ofivar� <br /> is located approximately four miles southwest of the site. Historically, hie expression <br /> active floodplain. Sediment deposition has produced a nearly flat topographic <br /> l <br /> In the site vicinity. Soils consist of interbedded alluvial, <br /> y deposited: clays, sifts, sands.and <br /> fine gravels. <br /> 3.2 Regional and Site HydrogeologY <br /> The San Joaquin River is the major surface drainage within the Stockton area of the San <br /> Joaquin Valley and flows approximately 40 miles from the point of origin the central San <br /> und-water_is considered unconfined and as <br /> been <br /> Joaquin Valley to the Suisun Bay.-Gro <br />