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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 soil and groundwater, dermal <br /> exposure, particle inhalation,and ingestion of impacted soil 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 monitoring 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 usin <br /> VEW-1. <br /> Attachments: <br /> 1 -Historical Groundwater Sampling Results <br /> 2-Soil Boring Logs <br /> 3-Utility Map <br /> 4-Cross-sections <br /> (0j <br /> U <br /> t�L <br /> 0854 Page 3 of 3 Date Modified: 10/3/2003 <br />