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Mr Mike Infuma <br /> March 27, 2006 <br /> C A M B R I A <br /> SITE CONCEPTUAL MODEL <br /> A detailed site conceptual model in tabular form is presented as Table 3 <br /> MASS CALCULATIONS <br /> Mass calculations were prepared for TPHg and benzene in soil and MTBE in groundwater <br /> Calculations indicate approximately 10-gallons of TPHg and 0 02-gallons of benzene remain in <br /> soil and 0 027-gallons of MTBE remain in groundwater Mass calculations are presented as Tables <br /> 4 through 6 <br /> CONCLUSIONS <br /> Soil impact appears to be limited to the area near the UST pit and includes only minor amounts of <br /> TPHg and benzene Minor amounts of MTBE remain in the second groundwater bearing zone at <br /> 30 fbg Concentrations of MTBE reported in groundwater grab samples from the 30 fbg depth <br /> only slightly exceed the California MCLS The remaining dissolved phase plume is defined both <br /> laterally and vertically within Cahforma MCLS by soil boring B-7 <br /> LIMITATIONS <br /> The services described in this assessment report were performed consistent with generally <br /> accepted professional consulting principles and practices No other warranty, express or implied, is <br /> made Summary of previous investigations contained in this report are generally excerpted from <br /> existing documents supplied by Chevron, and Cambria does not guarantee their completeness or <br /> accuracy <br /> • <br /> 6 <br />