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SITE CONCEPTUAL MODEL <br /> Former Texaco Service Station/ARCO <br /> 440 West Charter Way, Stockton, California <br /> 4 4 Well Survey Results A well survey conducted by Cambria in June 1999 identifed 1 water supply <br /> well and 3 municipal wells located greater than 2,000 feet south and <br /> northeast of the site <br /> 4 5 Likelihood of Impact to Wells Impact to the water supply wells identified northeast and south of the site is <br /> not likely due to the distance between the water supply wells and the site <br /> 4 6 Likelihood of Impact to Surface Unlikely because no surface water body has been identified within 2,500 feet <br /> Water of the site <br /> 5 Risk Assessment <br /> 51 Site Conceptual Exposure Model The site is currently an active fuel station The area surrounding the site is <br /> (current and future uses) commercial Future use of the parcel is assumed to be similar to current use <br /> If the site were to change use, sampling required following tank removal <br /> would identify any risk exceedances and residual hydrocarbons that <br /> potentially pose a risk could be addressed at that time <br /> 5 2 Exposure Pathways Potential exposure pathways include onsite commercial occupant inhalation <br /> of vapors from impacted soil and groundwater, dermal exposure, particle <br /> inhalation, and ingestion of impacted soil by onsite construction workers, and <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 /> 6 Additional Recommended <br /> Data or Tasks <br /> 61 Additional investigation Two additional well clusters (2 wells in each cluster) are recommended to <br /> monitor the two deeper water bearing zones These wells should be installed <br /> near wells MW-3 and MW-10 and be screened in the 70 to 80 fbg and 110 to <br /> 120 fbg depth range <br /> F__ <br /> 6 2 Continued monitoring Continue quarterly monitoring to assess concentration trends in the shallow <br /> land deeper water bearing zones <br /> Attachments <br /> 1 - Historical Sod Sampling Results and Locations <br /> 2- Historical Groundwater Sampling Results <br /> 3-Available Boring and Well Logs <br /> 4-Cross-Sections <br /> 5- List of Environmental Reports <br /> 6- Mass Estimates <br /> 1399 Page 3 of 3 Date Modified l 1/2/2004 <br />