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thickness of at least 10 feet of clayey soil, serving as a vapor barrier, <br /> exists between these utility lines and potentially impacted soil <br /> 4.2.3 Dermal Contact Pathway <br />' The risk of dermal contact would include both )Impacted soil and <br /> groundwater Factors affecting this assessment would include the <br /> extent and magnitude of impact as well as the use of groundwater <br /> PSC considers that the dermal contact pathway for impacted <br /> groundwater at this site is not complete Groundwater occurs too deep <br /> to make the risk of on-site contact probable The off-site potable well <br /> is reported to be out of service and the property where it was located is <br /> using municipal water Impact to the off-site irrigation well is <br /> considered improbable based on its cross-gradient location and the <br /> groundwater model, which indicates that it is not at risk <br /> The dermal contact pathway for impacted soil may be limited because <br /> of the soil that was excavated, the operation of the soil vapor <br /> extraction system, and the surface pavement at the site Further <br /> discussion of dermal contact of soil and groundwater by potential <br /> receptors is summarized in Section 4 3 <br /> 4.3 Potential Receptors <br /> An assessment of exposure pathways has identified limited, yet potential, <br /> receptors These potential receptors include water wells (groundwater <br /> ingestion pathway), onsite workers (soil ingestion and dermal contact with <br /> soil pathways) and offsite workers (groundwater ingestion and dermal contact <br /> with groundwater pathways) <br /> 4.3.1 Water Wells <br /> rSite data indicates that the plume of petroleum impacted groundwater <br /> is confined within the site's property boundaries However, the <br /> irrigation water well identified in Section 1 3 still serves as a potential <br /> receptor PSC considers the risk to this well from the UST release as <br /> limited because of its completion depth, the protection offered by the <br /> well's surface casing, its distance from the former USTs, its <br /> hydraulically cross-gradient location, and the groundwater model <br /> PSC's groundwater model, which assessed the fate and transport of <br /> benzene in groundwater at this site, indicates that petroleum <br /> 17 <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 /> H WNV162400132\121392EG1Stockton\StocktonllRemedialCompleuonRepon dm Apnf 14 2003 <br />