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Mr Chuck Cannel January 13, 1992 Page 5 The results of the analyses indicate that hydrocarbon affected soil is present in the recovery tank area and to a lessor extent in the waste oil tank area The hydrocarbon-affected soil beneath the recovery tank area is not likely the result of the recovery tank leaking or overfilling The hydrocarbons in this area are probably from the initial UST leak in 1984 The hydrocarbons identified in the soil located in the waste oil tank area are probably also the result of the 1984 leak. Ethylene dibromide was not identified in either samples T-North or T-South Lead was identified in manor concentrations (possibly background based on the USGS Professional Paper 1270, "Element Concentranons in Soils and Other Surficial Materials of the Conterminous United States", 1984) in samples T-North, WO-pit, and WOS- Comp Conclusion Based on the results of the soil samples collected during the recovery tank removal and waste oil tank installation,hydrocarbon-affected soil is present in both of these areas with the lowest concentrations occurring in the waste oil tank area The most likely source of the hydrocarbons is the former USTs. This source was removed in 1984, and a groundwater remediation system is now in place and operational at the site. To reduce hydrocarbon concentrations in the soil, ARCO is preparing to initiate a soil remediation program at this site. If you have any questions or comments regarding this letter,please call me at (916) 444-0123 Very truly yours, BROWN AND CALDWELL - Sit-eve Misner ay C�Lucas Project Manager California Registered Geologist #4301 SM:mb - cc Mr Jun Maughan, California Regional Water Quality Control Board, Central Valley Region Ms Mary Meays, San Joaquin County Mr Frank Tucker, City of Stockton Mr Chris Winsor, ARCO Products Company • 3rown and Caldwell 539&CORRF-SP,639604 Ll