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MA Working To Restore Nature Report on Vapor Extraction Test January 29, 1993 Coca-Cola Former Distribution Facility, Stockton, California 5400601 Soil Boring Samples ' Fifty-two soil samples were collected and submitted for laboratory analysis. The results of laboratory analyses are summarized in Appendix A Table A-1 and Table A-2 and listed under August/September 1990 data TPHg concentrations in soil ranged from ' nondetectable to 8,900 ppm (in B-5 immediately north of the former gasoline UST and at a depth of 20 feet) TPHd ranged from nondetectable to 20,000 ppm (again in B-5 at 20 feet) BTEX ranged from nondetectable to 920 ppm (total xylenes in B-5 at 20 feet) ' Organic lead, a constituent of Ieaded gasolines was nondetectable in all samples except one where it was detected at 0 059 ppm in boring B-5 at a depth of 20 feet (refer to Table A-2) The majority of petroleum hydrocarbons were present from 0 to about 25 feet below grade, and within about 25 feet of the former tank pit TPHg soil concentration contours summarizing this and all other subsurface investigations at the site are shown in Plate 4 Polynuclear aromatic hydrocarbons (PNAs) were also analyzed, and results are summarized in Table A-2 in Appendix A PNAs were nondetectable in all samples, with the exception of naphthalene in B-1 at 10 feet and 15 feet (30 ppm and 32 ppm respectively), in B-3/MW- 2 at five feet (3 3 ppm), and in B-5 at 20 feet (54 ppm) PNAs are not currently regulated in soil or water, but are regulated in air Soil Stockpile Two samples were collected from the soil stockpile, and analyzed for heavy metals, industrial solvents (by EPA Method 3810/8015), hazardous waste characteristics of reactivity, pH, flashpoint, and hazardous waste bioassays using flathead minnows The 17 industrial solvents tested were all nondetectable Flashpoint was nonhazardous and was greater than 100 °C (212 °F) The pH was normal at pH 8 2 and pH 8 7 The fish bioassays indicated the soil was nonhazardous, and had an LC-50 (Lethal Concentration at ' 50% kill) of greater than 1000 ppm The heavy metals detected were arsenic, barium, chromium III, cobalt, copper, lead, mercury, nickel, vanadium, and zinc RESNA checked normal soil background concentrations reported in the scientific literature (Lindsay, 1979, ' Scott, 1991) and determined that the heavy metal concentrations detected were at or below normal background concentrations 1 A Permit for Uncontrolled Aeration was obtained from the San Joaquin County Air Pollution Control District for aeration of the soil stockpile, with the exception of the drums containing soil from the upper 20 feet from borings B-1, B-2, and B-5 (USTEC, November 1990) This upper 20 teet of soil was transported to Ogden Environmental Services in 1 4