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Chevron Products Company 19 <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California June 5, 2001 <br />• Concentrations of TPHg, benzene, and MtBE have decreased on-site in both A and B -Zone <br />• Wells Concentrations of MtBE have increased in off-site B -Zone wells <br />• <br />• <br />• Concentrations of MtBE decrease with respect to distance from the source area <br />A conservative, tiered nsk-based assessment was conducted to evaluate on-site exposures <br />from site VOCs via soil and groundwater volatilization into indoor air The majority of <br />most VOCs detected in site soil and groundwater were eliminated from further evaluation <br />in Tier 1 The four chemicals evaluated in Tier 2 were also found to not pose a nsk <br />considered unacceptable by the RWQCB <br />• As of 1st quarter 2001, the SVE system has removed an estimated 3,769.5 pounds of TPHg, <br />85 1 pounds of benzene, and 440 3 pounds of MtBE An estimated 5 59 pounds, 0.136 <br />pounds, and 66 1 pounds of MtBE have been removed by the GWE system <br />• Well 12 has been removed from active service and placed on emergency standby status <br />• SECOR recommends the addition of two groundwater extraction wells south of Kettleman <br />Lane <br />I1Chevron1957751ParFrp19-5775PARFRP2 doe <br />