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r FALAFAW Working To Restore Nature Addendum One to Remedial Action Plan March 1, 1993 Coca-Cola Former Distribution Facility, Stockton, California 54006.01 ' 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 1 50% kill) of greater than 1000 ppm The heavy metals detected were: arsenic, barium, chromium IH� 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. ' 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 feet of soil was transported to Ogden Environmental Services in Stockton, Califorma where it was incinerated. ' Groundwater Samples Groundwater was encountered at a depth of about 70 feet below grade. In August 1990, five groundwater samples were collected and submitted for analysis, and all five showed detectable petroleum hydrocarbons. Cumulative results of laboratory analyses of ' groundwater samples are summarized in Table A-3. In August 1990, TPHg was nondetectable in all wells except MW-1 located immediately east of the former gasoline UST. In MW-1, TPHG was detected at 46 parts per billion (ppb). TPHd was detected in ' four of the five wells, and ranged from nondetectable in MW-3 to 220 ppb in MW-1. Benzene was present in MW-1 and MW-2 at 0.52 and 0.53 ppb respectively, and was nondetectable in MW-3 through MW-5. Toluene was nondetectable in all wells, except ' MW-3 where it was detected at 0.36 ppm; ethylbenzene was nondetectable in all wells; total xylenes were present in MW-I and MW-2 at less than 1 ppb. PNAs were nondetectable in the three wells analyzed for PNAs (MW-1 through MW-3). Volatile aromatic organic rcompounds (VAOCs by EPA Method 8020) were nondetectable in the two wells tested (MW4 and MW-5). All regulated chemicals were within State and Federal Maximum Contammant Levels (MCIs) in groundwater in August 1990. State and Federal MCLS are fisted at the bottom of Table A-3. 1 Additional Subsurface Investigation Additional step out borings (B-14 through B-24) were drilled in October and November 1990. Eleven borings were drilled, one groundwater monitoring well (MW-6)was ;nstalled in one boring, and four vapor extraction wells (VEW 1 through VEW4) were installed in A3