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Geological Audit Services, Inc. <br /> 1803 W. March Lane, Suite A•Stockton, CA 95207•(209) 956-0264• FAX(209)956-0700 <br /> r 16 April 1993 <br /> (GeoAudit 640-S) <br /> n r'-, r <br /> Mr. James DeMera <br /> MULLEN, SULLIVAN & NEWTON ` ` ` ` x ' ' <br /> P. O. Box 560 APR 19 1993 <br /> Lodi, CA 95240-0560 r-NVIRONMENTAL HEAJh, <br /> PERMITIKRWCEE <br /> subject: Recommendations for Future Investigation(s) - <br /> 1904 West Charter Way (Puregro Company) <br /> Stockton, California <br /> Dear Mr. DeMera: <br /> On 24 March 1993, Geological Audit Services, Inc. (GeoAudit) <br /> submitted a Preliminary Investigation and Evaluation Report (PIER) <br /> for the referenced site. After a review of the PIER report and <br /> discussions with Mr. Michael Infurna of the San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS/EHD) , <br /> GeoAudit has the following recommendations for future investigation <br /> at the site: <br /> ■ The soil contamination associated with the gasoline <br /> tanks (approximately 500 cubic yards) can probably <br /> be excavated and treated on-site or disposed at a <br /> landfill or recycling facility. Since the soil is <br /> the source of the gasoline contamination, removal <br /> would expedite groundwater remediation. <br /> ■ During the next quarterly monitoring period <br /> (May/June) , all water samples should be analyzed <br /> for volatile halocarbons (HVOC's; EPA 601) . Wells <br /> in which the samples test positive should continue <br /> to be monitored for HVOC's. <br /> ■ Any future soil investigation should include <br /> analysis for volatile halocarbons (EPA 8010) . <br /> ■ An investigation to determine the source and/or <br /> extent of 1, 2-Dichloropropane contamination in the <br /> shallow subsurface soils at the site should be <br /> considered. This could include collecting shallow <br /> soil samples (1 to 2 feet below surface grade) from <br /> the site and/or an investigation into the handling <br /> procedures for fumigants at the site. <br /> ■ The PHS/EHD will probably require a soil and/or <br /> groundwater investigation of the former diesel tank <br /> area. <br /> Environmental Services•Hydrogeology•Geotechnical Services <br />