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FOOTHILL E�TGINEERIl�T� " V" E -7 Dy CREEK LANE LQDI, CA 96240 PH. 0209)368-9381 FAX C209) 367-1163 Jeff Wong May 7, 1998 San Joaquin County Public Health Services Environmental Health Division P. O. Box 388 Stockton, CA 95201 Subject: Delta Packing Co. Site Investigation Site code: 1347 Dear Mr. Wong, On April 24, 1998, Foothill Engineering in the presence of the PHS/EHD, drilled and sampled soil in the immediate area of the now removed 500 gallon UST used by Delta Packing Company. The following is a report of the finding of this vertical investigation. SITE HISTORY The first investigations of the site where performed by Exceltech of Fremont, CA. on 4/10/87. Two soil borings were made on the east side of each tank to a depth of 45 feet. The sample nearest to the 500 gallon tank indicated a concentration of 0.78 mg/kg of Xylene, and Volatile Hydrocarbons of 9.0 mg/kg. All other samples were below detection limits. The tanks were removed by Jim Thorpe Oil on 1/18/90, under the direction of PHS/EHD. The under tank samples were taken by FGL Environmental at a depth of 2' to 4'below the bottom of the tanks and analyzed for TPHg and BETX. The sample from under the 500 gallon UST produced very low levels of TPHg and BETX(see attached recap sheet). A shallow domestic well is located about 25' from the 500 gallon UST. No odor or taste of gasoline are present in the well water. REFOR i OF FINDINGS Soil Boring The soil boring was done by Spectrum Exploration with a CME 55 Drill Rig. A six inch auger with split spoon sampler was used to retrieve standard BX soil tube sample at five intervals to a depth of 50 feet. Samples were retrieved, capped with Teflon and sealed with duct tape. Each set of samples was checked for gasoline odor by nose and hydrocarbon venting by PID meter. All samples were negative by both field analysis methods. Samples were transported under ice with a chain of custody to Sherwood Labs for analysis. Location map of the soil boring site is attached. Sample Analysis The samples from vertical depths of 5', 10', 15', 20', and 25', were analyzed by EPA method 8020 and EPA method 5030/8015. Samples retrieved from depths of 30'to 50'were placed on hold pending 1