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Shell Service Station <br /> 7190 Lower Sacramento Road,Stockton,California <br /> Similarly, soil sample PI-9 was collected 4 feet below surface from the product line trench <br /> connected to the pump island and approximately 10 feet southwest of the location of soil <br /> sample T-3. Petroleum hydrocarbons were not found above detection limits in soil sample <br /> PL-9. Product line trenches are backfilled with sand and engineered to drain away from <br /> dispenser islands toward the underground storage tanks. Furthermore, it is well <br /> documented that product line trenches act as conduits for the migration of petroleum <br /> hydrocarbons. Native soils directly beneath the dispenser island are of predominantly <br /> clay matrix, thereby enhancing the likelihood of migration of petroleum hydrocarbons <br /> through the product line trench. if petroleum hydrocarbons were released in the area of <br /> soil sample T-3, it is highly probable that low level petroleum hydrocarbons would have <br /> been detected in the product line trench 10 feet from the location of sample T-3. <br /> A more conservative application of the data would place an inferred zero line of petroleum <br /> hydrocarbons a maximum of 11 feet from soil sample T-3 in both the horizontal and <br /> vertical direction. The data also demonstrates that the extent of petroleum hydrocarbons <br /> in soil in the area of the northern dispenser has been investigated and defined. <br /> Therefore, on behalf of Shell Oil Company, Aegis respectfully requests a re-evaluation of <br /> the requirement for further investigation at this time. <br /> Thank you for your continued interest in this project. If you have any questions, please <br /> call me at (916) 782-2110. <br /> Sincerely, <br /> AEGIS ENVIRONMENTAL INC. <br /> Brian H. Garber <br /> Project Manager <br /> BHG/law <br /> 91-231C.LTR -2- <br />