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S [EC ® R <br /> a <br /> Conceptual Site Model <br /> March 24, 2004 <br /> Page 19 <br /> 8 0 CONCLUSIONS AND RECOMMENDATIONS <br /> This section provides a summary of the CSM elements, including sources and potential receptors <br /> 8 1 Primary Sources <br /> There appear to be, at a minimum, seven potential separate sources for petroleum hydrocarbon <br /> impacts in the vicinity of West Charter Way and South Lincoln Street These sources include the <br /> • Chevron Service Station 9-2033, located at 508 West Charter Way, Stockton, California P <br /> • Former Texaco Service Station, located at 440 West Charter Way, Stockton, California <br /> G� <br /> Former Arco Service Station 2168, located at 441West Charter Way, Stockton, California <br /> • The Transmission Shop, located at 515 West Charter Way, Stockton, California <br /> • Former Columbo/Toscana Bakery, located at 1444 Lincoln Street, Stockton, California <br /> • Former Dolly Madison Bakery, located at 1426 Lincoln Street, Stockton, California <br /> • Shell Branded Service Station, 620 West Charter Way, Stockton, California <br /> 8 2 Subsurface Conditions <br /> Data, from this site as well as other surrounding sites, including quarterly groundwater monitoring w <br /> data, indicate that the primary groundwater flow direction between 3Q99 and 4Q03 ranges from the <br /> north to the east-southeast (Figures 6 and 7) Based on Site groundwater monitoring data the depth <br /> to water has declined approximately 10 feet (Figures 10 through 12) — <br /> The vertical and lateral distribution of sediments are depicted on geologic cross sections (Figures 4 <br /> and 5) can be interpreted as meandering stream deposits composed of inter-bedded sand and fine- <br /> grained sediments The apparent horizontally and vertically discontinuous nature of the sediments <br /> appears to control the vertical and horizontal water quality profile <br /> 8 3 Petroleum Hydrocarbons in Soil and Groundwater <br /> A summary of soil and groundwater conditions is presented in the following sections 8y <br /> 9*! <br /> 1 <br /> 831 Soil Condition Summary <br /> Soil in the vicinity of SB-2 does not appear to be defined laterally Soil in the vicinity of MW-3 does <br /> not appear to be defined vertically and laterally Soil in the vicinity of SB-1 does not appear to be z <br /> fi <br /> defined vertically and laterally <br /> The former USTs, dispenser islands, product piping, and hydraulic hoists, have been removed and <br /> soil in the vicinity was over-excavated Mass balance estimates indicate „that approximately 2762 <br /> \ <br /> 11Chevron1920331REPORTSICSMICSM 92033 (REV B) doc <br />