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1710 Main Street Working To Restore Nature <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> January 14, 1994 <br /> Ms Margaret Lagono <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Subject Soil Remediation Workplan <br /> Holt Bros , Stockton Facility <br /> 1541 W Charter Way, Stockton, California <br /> Site Code 1988 <br /> Project No OW0402 00 <br /> Dear Ms Lagorio <br /> This letter will serve as a workplan for soil excavation to be conducted at the above referenced <br /> site (Figure 1) The scope of work is based upon findings from previous investigations <br /> SITE BACKGROUND <br /> In May of 1988, seven underground storage tanks (USTs) were removed from the site (Figure <br /> 2) During removal of the USTs evidence of soil contamination was noted An initial <br /> investigation (Phase 1) conducted by Dames & Moore included the installation of four monitoring <br /> wells (MW 1, MW2, MW3 and MW4) Soil samples collected from MW 1 exhibited elevated <br /> levels of gasoline hydrocarbons No contamination of soils was found during the installation of <br /> wells MW2, MW3 or MW4 Groundwater samples collected from wells MW1 and MW2 <br /> contained petroleum hydrocarbons and halogenated volatile organic hydrocarbons No dissolved <br /> contaminants were detected in wells MW3 and MW4 <br /> Phase I1 site investigations (September 1989 conducted b Bio National Corporation in <br /> P ) y rP <br /> conjunction with Dames & Moore included the drilling of five soil borings, with the completion <br /> of two borings as groundwater monitoring wells (MW5 and MW6) Petroleum hydrocarbons <br /> were detected in soil borings SB5 and MW6 (Figure 2) Groundwater contamination was not <br />• 0W04W2%REP0RTSIWP-1193 FNL <br />