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t i _ <br /> Ms Lori Duncan Project No 880-039 1 A 01010000 <br /> February 02, 2005 <br /> Page 3 <br />' those results quarterly to the air board On October 1, 2004, the remediation system was <br /> temporarily shut down due to fiscal constraints and remained off through the remainder <br /> of the quarter The County of San Joaquin was notified about the shut down <br /> Sampling Results <br />' No vapor samples were collected from treatment system's influent and effluent <br /> System Performance Status <br /> In the 94 days between September 29, 2004 and December 31, 2004, the treatment <br /> 1 system ran approximately 2 days (2 percent operational) <br /> Remediation System Performance Summary <br /> TPHg removed since February 3,2000 startup 3,244 lbs <br /> TPHg removed during this reporting period 0 lbs <br /> TPHg daily removal rate during reporting period 0 Ibsld <br /> TPHg destruction efficiency 0% <br /> TPHg emission rate to atmosphere 0 Ibsld <br /> benzene removed since startup 4 9 lbs <br /> benzene removed during this reporting period 0 lbs <br /> Benzene Destruction Efficiency 0% <br /> Benzene emission rate to atmosphere 0 lbsld <br /> Average flow rate for this reporting period 0 SUM <br /> System uptime during this reporting period 2 days 12% <br /> CONCLUSIONS <br /> Analytical results of groundwater samples collected from the site were generally consistent <br /> with previous sampling events Samples from well MW-4R-D have continued to indicate <br /> declining concentrations Groundwater elevation decreased in all wells between 0 66 and <br /> 0 93 feet from the August 9, 2004 sampling event The groundwater elevations during the <br /> fourth quarter 2004 indicated a trough that trended to the northeast Graphs showing TPHg <br /> and benzene concentrations, and groundwater elevations versus time in wells MW-1R, <br /> VW-2, and VW-3 are presented in Appendix D <br /> N 1sacDP120051Pra188018800391A 5aa doc SHAW ENVIRONMENTAL,INC <br />