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I <br /> On May 7 1986 an underground storage tank, (UST) used to store regular gasoline, was removed <br /> from the site. It is not clear what the tank size was because conflicting documentation refers to it <br /> as either 300-gallons or 450-gallons. The UST was located immediately behind the present above <br /> ground gasoline tank(Plate 3). There were no records available regarding when the tank was <br /> installed, inventory reconciliation,tank testing, or other operating information. <br /> Site Setting ' <br /> i <br /> The Owens-Brockway facility is Iocated at the western edge of the San Joaquin Valley southwest <br /> of the City of Tracy, California. The area is adjacent to the northern Diablo Range of the Coast <br /> Range geomorphic province. In the area, marine sediments striking to the northwest, and dipping <br /> to the northeast characterize the Diablo Range. The site is underlain by alluvial materials eroded <br /> from the adjacent Diablo Range. <br /> Groundwater in the area flows generally to the northeast following surface topography. The site <br /> elevation ranges from 140 to 170 feet MSL. A series of groundwater monitoring wells have been <br /> installed at the site to monitor discharges from the wastewater treatment ponds. Groundwater is <br /> encountered at depths ranging from 70 feet below grade at the south end of the site to <br /> approximately 50 feet below grade at the north side of the site. <br /> i <br /> Previous Investigations <br /> At the time the UST was removed one soil sample was collected from the bottom of the <br /> excavation. The sample was submitted to California Water Labs of Modesto for analysis of total <br /> petroleum hydrocarbons (TPH); aromatic volatile organics by EPA Method 8020;total lead; and <br /> ethylene-dibromide, (EDB). A copy of the analytical laboratory report is attached. The following <br /> summarizes the results of those analyses: <br /> Analyte Result Reporting Limit <br />+ Chlorobenzene ND 2.5 <br /> Toluene 192 10.0 <br /> Eth lbenzene 57.8 10 <br /> t Benzene 42.5 10 <br /> 1,2-dichlorobenzene ND 2.5 <br /> 1,4-dichlorobenzene ND 2.5 <br /> Xylene ND 2.5 <br /> Lead 15.7 NA <br /> EDB ND 5.0 <br /> I TPH 3.9 m NA <br /> I <br /> Owens-Brockway Tracy Work Plan Page 2 November 14,2001 <br /> CKG Environmental,Inc. <br /> 3 <br /> 1 <br /> J <br />