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Mr. Frank Yoneshige April 2, 1993 Van Den Bergh Foods, Inc. Job No. R92024.02 ' Page 3 o "None Detected" concentrations of volatile halocarbons and volatile aromatics in samples from the four borings B-101 through B-104 is consistent with the previous investigation results. Data indicate that the petroleum hydrocarbon t contamination is primarily diesel and that chlorinated solvents have not been released in the viciruty of the former tank emplacement. ' o Vertical migration of petroleum hydrocarbons has occurred beneath the former fuel tanks to a depth of 70 feet bgs and attenuates with depth. o Data collected during this quarterly ground water sampling event indicate groundwater at the site has not been impacted by petroleum hydrocarbon constituents. RECOMMENDATIONS ' RS recommends soil remediation for the petroleum hydrocarbon contaminated soil. Data from this assessment provides sufficient information to approximately delineanate the extent of soil contamination for soil remediation design. No additional groundwater monitor wells are recommended at this time. MW-4 is believed to be downgradient of the former tank emplacement because it's placement was based on ' elevation data obtained from MW-1, MW-2 and MW-3 and reported m Weston's October 1988 "Groundwater Investigation Report" for Ragu Foods, Inc. The need for additional wells should be evaluated after additional quarterly monitoring data is collected. Based on conditions at this site, two soil remediation options are recommended for consideration. The data indicate that the configuration of the contamination is columnar. Option 1 would be to remove the contaminated soil by auger drilling to a depth of 65-70 feet Auger drilling removes vertical columns of soil up to six feet in diameter. The ' columns would be backfilled with a lean grout Contaminated soil could be drpsosed off-site or treated on site if space is available ' Option 2 is to excavate impacted soil to a depth of 20 feet to 30 feet in areas that are readily accessible, and to install a bioventnng system for remediation of the deeper and/or inaccessible areas. Bioventnng would require a relatively long time, compared to auger drilling, to accomplish remediation. RS will submit a proposal comparing the advantages and disadvantages of the two options with cost estimates for each. RS recommends that copies of this report be submitted to the San Joaquin County Public Health Services Environmental Health Division (SJPHS) and the Central Valley Regional Water Quality Control Board (CVRWQCB) for their review R E M E D I A T I O N SERVICES INC