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SITE CONCEPTUAL MODEL <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue, Stockton, California <br /> 4 6 Likelihood of Impact to Surface NA, no surface water bodies were identified <br /> Water <br /> 5 Risk Assessment <br /> 5 1 Site Conceptual Exposure The site is currently occupied by an operating service station The <br /> Model (current and future uses) area surrounding the site is mixed commercial and residential <br /> Future use of the parcel is assumed to be similar to current use <br /> 5 2 Exposure Pathways Potential exposure pathways include onsite commercial occupant <br /> inhalation of vapors from impacted sod and groundwater, dermal <br /> exposure, particle inhalation, and ingestion of impacted sod by <br /> onsite construction workers, and ingestion of impacted groundwater <br /> offsite <br /> 5 3 Risk Assessment Status No formal risk assessment has been performed for the site <br /> 5 4 Identified Human Exceedances NA <br /> 5 5 Identified Ecological NA <br /> Exceedances <br /> 6 Additional Recommended <br /> Data or Tasks <br /> 6 1 Additional investigation Install two, monitonng wells in the first water-bearing zone <br /> downgradient of the existing tank complex (one onsite and one <br /> offsite) Install one deep monitoring well onsite <br /> 6 2 interim remediation Conduct a long-term DPE test using VEW-2, and conduct SVE using <br /> • VEW-1 � <br /> 1 <br /> Attachments <br /> 1 -Historical Groundwater Sampling Results n �� L <br /> 2-Soil Boring Logs <br /> 3- Utility Map <br /> 4-Cross-sections <br /> 0854 Page 3 of 3 Date Modred 10/3/2003 <br />