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• Historic high TPH-G and benzene concentrations in groundwater have reached <br /> ' 196,000 pg/l and 6,800 µg/l, respectively Current petroleum hydrocarbon <br /> concentrations are significantly less than historic highs due to remedial activities <br /> and natural biodegradation The TPH-G mass in groundwater, prior to <br /> remediation, was calculated at about 70 kg (154 pounds) The current TPH-G <br /> mass to groundwater was calculated at about 33 kg (73 pounds) <br /> • DIPE is the only oxygenate compound that has been consistently detected in <br /> ' groundwater at the site Current DIPE concentrations are 41 pg/l or less <br /> • Naturally occurring microbes have been identified in subsurface soil that grow on <br /> and digest petroleum hydrocarbons Physical parameters measured in <br /> groundwater indicate that naturally active biodegradation is occurring at this site <br /> • Site information indicates that potential exposure pathways for impacted soil are <br /> ' generally improbable or incomplete PSC considers that risks to associated <br /> potential receptors are limited <br /> ' • IPSC considers the potential of receptors to ingest or contact petroleum impacted <br /> groundwater is limited Groundwater modeling indicates that the concentration of <br /> benzene will not exceed its associated MCL beyond the facility's property <br /> boundary <br /> 1 ' <br /> 21 <br /> Remedial Action Completion Report <br /> The Earthgrams Company Facility <br /> 2651 South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGRAINS COMPANY Prepared by Philip Services Corp <br /> 11\EN V\62400132\I 2I382EGVSiockton\SiockionlRemedialComplehonReport doc April 14,2003 <br />