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Stockton Meat Plant - Case Closure Page 3 March, 1996 1100 ) 0D below ground surface and ranged from 210 mg/kg to_P00 mg/kg (TP-18 a 21 feet and TP-22 020 feet, respectively) � 11191 Three ground water monitoring wells were installed at the site No MW- ) 310 370 hydrocarbons were detected in soil samples during the installation work 1),W_2, 330 330 IGroundwater samples from the three wells were also reported with non- 3 ISo !S'O detectable concentrations of petroleum hydrocarbons and volatile compounds -ple0 q-1.9 Soil Remediation 1988-89 Attachment C contains the soil remediation documentation Soils were aerated on site On November 28, 1989, Western Geologic Resources, Inc I documented the soil remediation in a letter to the San Joaquin County Department of Public Health Services (PHS) Approval was granted from the Regional Water Quality Control Board to distribute the remediated soil on ' site (Attachment C, December 11, 1989 letter from RWQCB to San Joaquin County PHS) The present location of the remediated soils is indicated on Figure 2 Subsurface Investigation 1990 Western Geologic Resources, Inc documented additional soil and groundwater conditions at the site in a report entitled, Subsurface Investigatzon, dated January, 1990 A copy of the executive summary with figures and/tables ' from the report are included in Attachment D The reason for the work was to determine the extent of hydrocarbons west and south of the former underground tank site excavation ' Six boreholes were drilled on the southern and western edge of the previously excavated tank site One of the boreholes (B-10) was converted to a ' monitoring well (MW-4) Results of the worked confirmed the final soil samples within the excavation work (i a varying concentrations of diesel) from non-detect to greater than 1,000 mg/kg) In each of the six boreholes, only soil samples in the deeper strata were reported with diesel Qeeyce.P ' concentrations ranging from 28 to 2,400 mg/kg Specifically, diesel was jG-1- reported in soil samples from 25 feet to 25 5 feet below grade in borings B-11, ' B-14, and B-15 at 28 mg/kg, 120 mg/kg, and 2,400 mg/kg, respectively Ground water at the site was reported at 26 8 feet below grade on October 3, 1989 Ground water flow direction was east-southeast at a gradient of 0 1% Ground water samples were reported with non-detectable concentrations of TPH or B EX