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SITE CONCEPTUAL MODEL <br /> Prepared by Cambria Environmental Technology, Inc <br /> 4.4 Well Survey Results A well survey conducted by Cambria In November 2004 identified tw <br /> domestic water wells located approximately 1,300 feet southwest and 1,9 <br /> feet east of the site,respectively. <br /> 4.5 Likelihood of Impact to Wells Impact to the water supply wells is not likely due to the distance between th <br /> water supply wells and the site,and the fact that groundwater flow direction 1 <br /> consistently toward the north(away from the identified wells). <br /> 4.6 Likelihood of Impact to Surface Unlikely because no surface water body has been identified within 2,000 fee <br /> Water of the site. <br /> 5.1 Site Conceptual Exposure Model The site is currently occupied by an operating service station. The are <br /> (current and future uses) surrounding the site Is commercial. Future use of the parcel is assumed It <br /> be similar to current use. <br /> 5.2 Exposure Pathways Potential exposure pathways include onsite commercial occupant inhalatio <br /> of vapors from impacted soil and groundwater, dermal exposure, particl <br /> inhalation, and ingestion of impacted soil by onsite construction workers, an <br /> ingestion of impacted groundwater offsite. <br /> 5.3 Risk Assessment Status No formal risk assessment has been performed for the site. <br /> 5.4 Identified Human Exceedances None Identified. <br /> 5.5 Identified Ecological None identified. <br /> Exceedances <br /> r . <br /> 6.1 Additional investigation None recommended. The MTBE plume is defined to the extent possible <br /> given physical constraints In the site vicinity. Interstate 205 is located <br /> immediately downgradlent of the site and is approximately 300 feet wide. <br /> Investigation across Interstate 205 is not likely to significantly change the site <br /> conceptual model. <br /> 6.2 Interim Remediation Shell recommends continued interim remediation in the form of periodic GW <br /> from wells MW-1 and MW-6 to address MTBE concentrations in <br /> groundwater. Since MTBE is no longer a component of fuel at the site,the <br /> source has been removed,and periodic GWE and natural attenuation should <br /> sufficiently remove dissolved MTBE mass in groundwater. <br /> lContinued monitoring Continue monitoring to verify the effectiveness of interim remediation efforts. <br /> Attachments: <br /> 1 -Historical Soil Sampling Results and Locations <br /> 2-Historical Groundwater Sampling Results <br /> 3-Available Boring and Well Logs <br /> 4-Cross-Section <br /> 5-Well Survey Information <br /> 6-List of Environmental Reports <br /> 1661 Page 3 of 3 Date Modified:3R1I2006 <br />