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Ms. Lori Duncan S E C ® R <br /> May 6, 2005 <br /> Page 4 <br /> i <br /> REMEDIAL RESULTS SUMMARY (ARCO) <br /> Cumulative FP Recovered to Date: 642 lbs <br /> Cumulative TPHg Removed by GWE: 3,980 lbs <br /> Total Groundwater Extracted: 32,000,000 gal <br /> TPHg Removed by SVE this quarter: None <br /> Cumulative TPHg Removed by SVE: 4,897 lbs <br /> MtBE Removed this Quarter: None <br /> Cumulative MtBE Removed: 4.5 lbs <br /> Approximate Depth to Groundwater: 5.04—7.68 ft <br /> ARCO's historical SVE data and recent AS system operational data are presented in detail <br /> in Attachment E, <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The groundwater flow direction, hydraulic gradient, groundwater concentrations reported <br /> during 1 Q05 are consistent with historical data. <br /> STATEMENT OF LIMITATIONS <br /> This report presents our understanding of existing conditions at the subject site. The <br /> conclusions contained herein are based on the analytical results, and professional <br /> judgment in accordance with current standards of professional practice; no other warranty <br /> is expressed or implied. SECOR assumes no responsibility for exploratory borings or data <br /> reported by other consultants or contractors. <br /> Should you have any questions or concerns regarding these activities, please feel free to <br /> contact Rusty Benkosky at 916-861-0400, ext. 229. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Tonya Myers Rusty Benkosky E. <br /> Staff Scientist Principal Engineer <br /> C <br /> • * E*1?/811d6 <br /> 1AChevron1942751Per1odic MonitoringlQ M R1200511 Q05.doc O CA%-kf <br />