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43 Groundwater Sampling Resulta <br />' The groundwater monitor wells were developed and sampled by Canonie on November 5, 1992 <br /> Groundwater samples were analyzed for TPHg, BTEX, and EDB The only sample with petroleum <br />' hydrocarbons present above the laboratory detection limits during flus event was from well W3 with <br /> 0 55 parts per billion (ppb) of xylenes The groundwater monitor wells were again purged and <br />' sampled by SEA COR on December 2, 1993 The only sample with petroleum hydrocarbons present <br /> above the laboratory detection limits during this event was from well W6 with 0 06 ppb toluene <br />' These concentrations are well below the maximum contaminant levels of 1750 ppb xylenes and 1000 <br /> ppb toluene in A Compilation of,WaterQuality Goals published by the CRWQCB-Central Valley <br />' Region Results of the groundwater analyses are shown in Table 4 <br />' 5.0 REMEDIATIONALTERNATIVES <br />' Laboratory results of groundwater samples collected at the site indicate that remediation of site <br /> groundwater is not an issue Because of this,remedial actions for the site will be limited to the soils <br /> which have been impacted with petroleum hydrocarbons <br />' Remediation alternatives for treatment of hydrocarbon impacted soil at the site were evaluated for <br />' general feasibility and cost effectiveness The remediation alternatives that were studied included <br /> ■ Soil excavation with on-site aeration, land farming, or disposal <br /> ■ Soil vapor extraction <br /> ■ In situ biodegradation <br /> ■ Physical containment or chemical neutralization <br /> 5 1 Soil Excavation <br /> ISoil excavation includes the physical removal of all hydrocarbon impacted soil Subsequent to <br /> excavation and treatment of the soils, the soil can either be backfilled or disposed of at a Class III <br /> sanitary landfill The impacted soil can be treated by simple aeration, landfarming, or be disposed <br /> I UA-1434PARQ SE&COR` <br /> 8 <br /> N00o5-002-0I Mey 31 M% <br />