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i PROBLEM ASSESSMENT REPORT s BULB DISTRIBUTION PLANT .� MOORE PETROLEUM, INC. BANTA, CALIFORNIA NGA PROJECT NO. 10-90-481 1.0 IN'T'RODUCTION 1.1 authorization and Purposs Nations Groundwater .Associates (NGA) has been authorized by Moore Petroleum, Inc. to prepare this problem assessment report of Moore Petroleum's bulk distribution plant located at 5491 F Street, Banta, California, T.2S, R.5E. , Section 24 MDB&M (Figure 1) . The purpose of this report is to present details of recent investigation activities at the site, evaluate the extent .of petroleum constituents in soil and ground water, and provide recommendations for remediation plans (if required) for soil and ground water at the site. 1 2_ScoRe of Work . The scope of work for this report includes the following activities: Review of available geologic and hydrogeologic data pertinent to the site. s Drilling three hollow-stem-auger soil borings to obtain undisturbed soil samples at 5-foot-depth intervals. Soil samples were screened with detector tubes sensitive to the presence of total petroleum hydrocarbons (TPH) . Selected soil samples were submitted to a California- certified laboratory to be analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) , 1,2-dichloroethane (EDC) , ethylene dibromide (EDB) , and TPH by EPA method 8260. s Classify soils encountered in the soil borings according to the Unified Sail Classification System. e Completion of each soil boring as a ground-water monitoring well (MFT-4, MW-5, and MW-6) . Development of the newly installed mon4toring wells and the collection of water samples from all monitoring wells at the site. Ground-water samples were submitted to a ----------Cali€ornia-certified--laborator ---- - ------ - ---------------- y-and--analyzed--dor--BTEX-,----- EDC, EDB, and TPH using EPA method 8260.