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=�.�• M. Soil Remediation Information <br /> Soil remediation method(s) Ex9avation. treatmentn r ion and-off-site digVQsal <br /> Volume treated and/or removed 1.250 ubi + W cu i <br /> Contaminated soil disposal site BFI Waste ystems. Livermore, CA + L i law Envir nm n al <br /> Services, A <br /> If contamination is remaining, describe concentration range and volume (cubic yards or meters) <br /> Appears extremely limited <br /> Table III - Maximum documented contaminant concentrations in soil before and after cleanup <br /> Method Before After Depth Method Before After Depth <br /> Contaminant used (mg/kg) (mg/kg) (ft) Contaminant used (mg/kg) (mg/kg) (ft) <br /> TPH(Gas) Excavation & 3,900 6.1 26 Benzene Excavation 7.4 0.57 26 <br /> disposal &disposal <br /> El <br /> Excavation ND ND -- Toluene Excavation 110 0.91 26 <br /> &disposal &disposal <br /> Excavation ND ND -- Ethylbenzene Excavation 410 0.73 26 <br /> &disposal &disposal <br /> Excavation 2.3 2 Xylene Excavation 47 0.066 26 <br /> &disposal &disposal <br /> Excavation - 2.9 2 Zinc Excavation -- 27 2 <br /> &disposal &disposal <br /> IV. Groundwater Remediation Information <br /> Groundwater remediation method(s) Primary d SeCondaa sourceremoval <br /> Volume treated and/or removed See III for soil guantities <br /> If contamination is remaining, describe concentration range and volume (gallons or liters) NIA <br /> iTable IV- Maximum documented contaminant concentrations in groundwater <br /> before and after cleanup <br /> Method Before After Depth Method Before After Depth <br /> [Eon used (mg/L) (mg/L) (ft) Contaminant used (mg/L) (m9fL) (ft) <br /> Natural Bio- 0.660 0.240 Waste Benzene Natural Bio- 0.096 4.0058 Water <br /> degradation Table degradation Table <br /> NA Not Not -- Toluene 0.0059 0.0014 " <br /> analyzed analyzed <br /> NAEthylbenzene 0.00057 0.00051 NA Xylene 0.065 0.0013 <br /> Other <br /> V. Closure <br /> Does Regional Board concur with closure? Yes,,,_ No_ <br /> Rationale for closure Known "source" areas of significant hydrocarbon-imnacted s io l have Veen <br /> removed during_extensive excavation in the area of the underground fuel storage tank pit. Ground water <br /> 1 ll fr mwells have indiciged non-detectable con _ntrations of TPH as gasoline and <br /> b nzen in M h f 193, exeolfor 9.77 /L of benzene in MW_1 in Sotember of 1993. <br /> Th r fore n nt <br /> gntigj threat of con amin tion toi ground water remains at site, <br /> . Location of reports on file (Agency/Room) <br /> County Staff person Phone <br /> Regional Board office Staff person Phone <br />