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J <br /> 1 <br /> Petroleum Hydrocarbons in Soil and Groundwater <br /> E <br /> Most of the contaminated soil is restricted to a small area below the former tank pit near <br /> the groundwater table,between 55 feet bgs and 75 feet bgs. Virtually no hydrocarbon vapor <br /> was detected from shallow soil-gas samples. <br /> Significant levels of BTEX, TPH-Gas, and lead are present in the groundwater beneath the <br /> Disco property. The contamination is largely dissolved, no floating product was observed. <br /> Remedial Actions <br /> The development and evaluation 'of remedial alternatives at the Del Monte Plant 33 <br /> i property are presented in Section 4 of this report. The recommended remedial action for <br /> the property combines groundwater extraction, air stripping, and groundwater reinjection to <br /> remove petroleum hydrocarbons from groundwater and sparging/in situ bioremediation to <br /> remove volatile compounds from the unsaturated zone. Phase 1 of the recommended <br /> Remedial Action Plan targets the near-source area for immediate treatment using the <br /> following technologies: <br /> • Three extraction wells <br /> • Air strippers (two in series) <br /> Granulated Activated Carbon on offgas <br /> Infiltration galley <br /> • One sparging well with vapor recovery <br /> Remediation of petroleum hydrocarbons in downgradient areas may be addressed in <br /> subsequent work phases. <br /> i <br />