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` UST Closure Report The Earthgrains Company 2651 S. Airport Way, Stockton, California April 10, 1996 Paas 2 abandoned in place. Product and product return lines between the UST and the adjacent building were removed and transported with the UST for disposal. The UST interior atmosphere was then inerted with solid carbon dioxide (dry ice). The explosive level and oxygen content was measured with a Gastechtor Model #1314 combustible gas indicator prior to removal. The removed tank was inspected by personnel from the San Joaquin County Public Health Services Division and the Stockton Fire Department. The inerted UST was loaded onto a truck operated by Erickson, Inc. for transport to their 255 Parr Boulevard, Richmond California facility, for lawful disposal. Soil Sampling and Analysis Two soil samples were collected from native soils beneath the excavation floor by personnel from Western Environmental Science and Technology (WEST), a State -Certified analytical laboratory located in Davis, California. The samples were collected according to the Ramcon Standard Procedures included as Attachment A. Two additional soil samples were collected by WEST from hand auger borings located adjacent to the product supply and remote fill product lines. Four samples were also collected by WEST from the resulting soil stockpile for 4-1 composite analysis by the laboratory. The five soil samples were analyzed for total petroleum hydrocarbons (TPH) as diesel -range compounds, and the purgeable aromatic hydrocarbons benzene, toluene, ethylbenzene, and total xylenes (BTEX). The analysis indicates that low concentrations of TPH diesel occur in sample PF 1 n, collected from the north side of the excavation floor. Analysis of the stockpile samples indicates ` detectable, but low concentrations of TPH diesel. Purgeable aromatics were not detected in any sample. Soil sample analysis is summarized in Table 1. M J . �7o69v003�781\WF'61,REPORi 110