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Mr Kenneth Earnest <br /> Ultramar Inc <br /> • April 16, 1996 <br /> Page 2 <br /> emission rates Example TPH as gasoline extraction and emission rate calculations are included in <br /> Enclosure A Copies of the analytical reports are included in Enclosure B <br /> Based on field instrument readings, the hydrocarbon abatement efficiency of the catalytic oxidizer had <br /> been greater than the permit requirement of 90 percent during the reporting period Table 1 presents <br /> the calculated abatement efficiencies Abatement efficiency calculations are provided in Enclosure A <br /> Due to low soil vapor hydrocarbon concentrations, the system was shut down on February 6, 1996 <br /> In an effort to assess if soil vapor hydrocarbon concentrations had increased since the last site visit, <br /> the system was temporarily restarted on February 19, 1996, and allowed to operate until the next day <br /> when system monitoring would be performed The field hydrocarbon readings collected during the <br /> February 20, 1996, site visit indicated that the hydrocarbon concentrations were still low and the <br /> system was shut down Modifications to the existing system are currently being evaluated by <br /> Ultrarnar in a effort to assess if further site remediation is necessary Due to the limited operation <br /> of the SVE system during the month of February 1996, monthly soil vapor samples were not <br /> collected for laboratory analyses for that month <br /> Remarks/Signatures <br /> The information contained in this report represent our professional opinions, and are based in part, <br /> on information supplied by the client These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location Other than this, no warranty is implied or intended <br /> If you have any questions concerning the information presented, please contact Owen Kittredge <br /> at (916) 638-2085 <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Steven W Meeks <br /> Project Engineer <br /> r <br /> t <br /> OW n M Kittredge, R G <br /> Project Manager <br /> SWM (LRP162 CAC) <br />. Enclosures <br />