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-- ` eolo icaI Audit Se tl 1 ce Inc. <br /> e <br /> Environmental Professionals <br /> 1803 March Lane, Suite A•Stockton, CA 65207-6414•(206) 656-0264•Fax(206)656-0700 <br /> ® I <br /> i <br /> INTERIM WORK PLAN <br /> Hess-DuBois Cleaners <br /> 348 West Harding Way <br /> Stockton, California <br /> December 1994 <br /> 1,4 INTRODUCTION <br /> In accordance with the request of Mr. Peter Wallace, Geological Audit Services, Inc. <br /> (GeoAudit) has prepared this Interim Work Plan for the drilling and installation of <br /> additional monitoring wells at 348 West Harding Way in Stockton, California (the site). The <br /> location. of the site iy illustrated on figure L A_ plan of the site is illustrated on Figure 2. <br /> :2-0. BACKGROUND <br /> 11 Site Location <br /> The site is located it a topographically flat business/residential area of Stockton, California <br /> (Figure 1). The site is located on Handing Wast.,= apprn�imately 114-mile west of the <br /> intersection of Pacific; Avenue. The site is curren0y cxxupied by a dry cleaning business. <br /> 2.2 Tank Removal <br /> Eight underground storage tanks (USTs) were removed from the site by Falcon Energy <br /> Associates (FEA) in January 1991. It is our understanding that the tanks contained stoddard <br /> solvents used in a dry cleaning process. <br /> Tanks #1 through #7 were removed from a common excavation along the southern portion <br /> of the property (tank pit #1). Tank #8 was removed from beneath the sidewalk along Van <br /> Buren Street (tank pit #2). The volume of each tank is listed in Table 1. <br /> Soil samples collected from tank pit #1 indicated that an unauthorized release of <br /> hydrocarbons has occurred. Total petroleum hydrocarbons (TPH as stoddard solvent)were <br /> detected at concentrations of 970 ppm to 3,000 ppm. Volatile aromatics(BTE&X)were also <br /> detected in tank pit,#1. No TPH or BTE&X were detected in tank pit #2. <br /> GN44"I A.& ,­ 1 <br /> Fcw osvn�anY..�e.�.want94 <br /> Full Spectrum Environmental Services• Hydrogeology <br />