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5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 5.1 CONCLUSIONS <br /> The UST located at the Stockton Metropolitan Airport has been removed with permission <br /> from the State of California State Water Resources Control Board and San Joaquin County. <br /> The UST was transported by H & H Environmental Services to Schnitzer Steel, Oakland, <br /> California and was properly disposed of. <br /> Soil samples were collected under supervision of Ms. Violett of San Joaquin County by a <br /> qualified professional environmental scientist as described above and project work has been <br /> reviewed by a California Registered Professional Engineer. The analysis was performed by <br /> a State Department of Health Services certified laboratory, Caltest Analytical Laboratory, <br /> for TPH-D and BTEX by EPA Methods 8270 and 8260, respectively. <br /> Based upon this analysis, it can be concluded that the in-place soils may contain diesel <br /> hydrocarbons at concentrations less than 2.5 mg/kg and that the stockpiled soils contain <br /> diesel hydrocarbons at a concentration of 180 mg/kg. None of the soils sampled contain <br /> BTEX compounds above the reporting limits. <br /> 5.2 RECOMMENDATIONS <br /> _ The findings detailed in this report, (observed conditions, laboratory sample analysis, etc.), <br /> indicate that the stockpiled soils contain petroleum hydrocarbon contaminants originating <br /> _ from the removed UST above the action level of 100 mg/kg. Laboratory analysis of soil <br /> samples collected from the stockpile indicate diesel compounds detected at a concentration <br /> of 180 mg/kg. Based on discussions with the San Joaquin County Environmental Health <br /> Division, removal and proper disposal of the stockpiled soils should meet the requirements <br /> for closure of underground storage tank sites. <br /> Stockton ASR UST <br /> Removal/Closure Report 7 June 24, 1994 <br />