ARCHIVED REPORTS_XR0007882 - Laserfiche WebLink

Home Browse Search

Working To Restore Nature Report on Vapor Extraction Test January 29, 1993 Coca-Cola Former Distribution Facility, Stockton, California 5400601 rStockton, California 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 Appendix A, 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 052 and 053 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-1 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 compounds (VAOCs by EPA Method 8020) were nondetectable in the two wells tested (MW-4 and MW-5) All regulated chemicals were within State and Federal Maximum Contaminant Levels (MCLS) in groundwater in August 1990 State and Federal MCLS are reported at the bottom of Table A-3 in Appendix A 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 installed in one boring, and four vapor extraction wells (VEW-1 through VEW-4) were installed in four other borings Soil type was primarily clayey and sandy silt Cumulative results of laboratory analyses of soil samples are summarized in Appendix A, Tables A-1 and A-2, listed under October/November 1990 data TPHg was nondetectable in all eleven borings, with the exception of B-15/VEW-2 and B-16/VEW-3 TPHg in these two borings ranged from nondetectable to 630 ppm (at 5 feet in B-16/VEW-3) TPHd was nondetectable in 1 all borings except B-14/VEW-1 through B-17/VEW-4, and ranged from nondetectable to 50 ppm (in B-16/VEW-3 at 15 feet) BTEX was nondetectable in five of the borings, and in the other six borings ranged from nondetectable to 44 ppm total xylenes (in B-16/VEW- 3) TPHg soil concentration contours at depths of 0 to 30 feet are shown graphically in PIate 4 PNAs were nondetectable in all of the 14 samples tested, with the exception of B- 16/VEW-3 which contained 3,500 ppm naphthalene at a depth of 5 feet, as reported in Table A-2 in Appendix A 1 5 r