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r _ - _ Mr. Hank Sheetz June 24, 1987 Page 2 Benzene and toluene levels exceeded DHS designated action levels in both samples_,.. and xylene exceeded its action level in sample P-N0. c6` n March 26, 1937, BC and American Environmental Management orporation (AEMC) personnel pumped approximately 380 gallons of ater containing dissolved hydrocarbons from the two shallow excavation pits while Becker personnel conducted a test of the vent line. On April 6, 1987, BC and AEMC personnel pumped an additional approximately 220 gallons to give Becker personnel access to the vapor lines. All water was containerized. in, drums and transported by AEMC to H and H Ship Service in San Francisco. Becker personnel discovered a leak in the manifold in the vapor line connecting the two regular leaded tanks. Becker replaced the vapor line piping on April 11, 1987, and the regular leaded tank system passed a pressure test on April 13, 1987. In addition to replacing the regular leaded tank vapor line piping, Becker replaced all valves in the piping of the regular leaded, regular unleaded, and super unleaded tank systems. To provide access to the piping, Becker, in late April, excavated around these tank systems to approximately 3 feet. The excavated material was stockpiled on asphalt along the east side of the station. On April 28, 1987, BC personnel collected five soil samples by hand augering approximately 1 foot into the spoil pile of excavated material. Soil samples were collected at the locations shown on j Figure 1. Three soil samples were selected and sent to the BC Emeryville laboratory for analysis for BTX, total fuel hydrocarbons, and total lead. The results of these anal y are summarized ,ip Table 2. Complete results are enclosed. Table 2. Analytical Results: Soil Samples Constituent Action levela AST-1 AST-4 AST-5 Benzene 0.7 <0.01 <0.01 <0.01 Toluene 100 <0.01 0.11 <0.01 Xylene 620 <0.01 0.15 <0.01 Total fuel hydrocarbons -- 360 64 <10 Total lead 500 10 14 12 Note: All measurements shown are in milligrams per kilogram (mg/kg) . E aDesignated action level in a solid for the protection of ground- __ water quality recommended by-the California Regional Water Quality Control Board,Board, Central Valley Region, September 1986:------------ — - '---- -------------- bNo standard, is established for total fuel hydrocarbons. BROWN AND CALDWELL 723 S STREET SACRAMENTO.CA 95814•1916)444 9123