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.� Background Wright Environmental Services, Inc (Wright) has prepared this report on behalf of Ms Janke Brown executor of the Mr Elroy Cox estate and former property owner and (responsible party) for the above referenced site This work is in response to a letter dated November 29, 1999 from the San Joaquin Public Health Services Environmental Health Services Environmental Health Division (PHS-EHD) for additional site assessment Previous site assessment activities have mapped the dissolved plume, the former underground tank sources have been removed and quarterly monitoring sampling with reports are ongoing at the site This additional assessment is being done to address locally elevated residual contaminants on-site, spectfically in the immediate vicinities of Wells MW-3 and MW-9 and the PHS-EHD concern of another possible UST source on the site Field modifications to the work were made in consultation with the PHS-EHD representative as discussed below r According to EVAX (1992) and Remediation Risk Management (1993), five underground storage tanks were removed (one 8,000-gallon gasoline, one 7,500-gallon premium gasoline, two 4,000-gallon for unleaded gasoline, and one waste oil tank were reportedly removed) Thirteen soil samples were reportedly collected and chemically analyzed at FGL Environmental of Stockton, California Those samples indicated petroleum hydrocarbon leakage in the immediate tank pit vicinity In addition, EVAX also performed • a soil vapor survey, the results of which were used to locate the initial three-groundwater monitoring wells Wright had performed an additional subsurface sampling assessment and installed six monitoring wells, and has conducted quarterly groundwater monitoring Additional subsurface study was requested in a letter dated November 29, 1999 from the San Joaquin Public Health Services Environmental Health Division (PHS-EHD) for additional site assessment This work is being done to address locally elevated residual contaminants on-site, and a suspect additional contaminant source, specifically in the immediate vicinities of wells MW-3 and MW-9 The first phase of work was performed in April, 2000 to attempt to delineate selected areas Following a review of that data, Wright and PHS-EHD agreed to review all the site data and to perform additional studies to ascertain whether a possible tank source was present This report presents the subsurface data from the April, 2000 and April, 2001 investigations Page 2