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Third Quarter 2003, Groundwater Monitoring Report <br /> October 30, 2003 <br /> Page 3 <br /> are summarized for TPHg, benzene, and MtBE in Figure 2 A groundwater elevation contour map of <br /> the two sites is presented as Figure 3 Attachment 1 contains ARCO's historical SVE and recent AS <br /> system operational data Attachment 2 contains field and laboratory procedures Attachment 3 <br /> contains Chevron laboratory analytical results, chain-of-custody documentation, and field data <br /> sheets Attachment 4 contains ARCO laboratory analytical results, chain-of-custody documentation, <br /> and field data sheets <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring (ARCO & CHEVRON)/Remediation (ARCO) <br /> Frequency of Groundwater Sampling ARCO - E-2, E-8 through E-12, PR-1, BHD-1, MW-4, and <br /> MW-5 sampled quarterly, E-3 through E-7, PR-2, BHD-2, <br /> MW-1, MW-2, and MW-3 sampled 15' and 3`d quarters only <br /> CHEVRON - MW-1 through MW-9 and Municipal well # 10 <br /> sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly (ARCO & CHEVRON) <br /> Is Free Product (FP) Present Onsite No (ARCO & CHEVRON) <br /> Cumulative FP Recovered to Date 642 lbs (ARCO) <br /> Cumulative TPHg Removed by GWE 3,980 lbs (ARCO) <br /> Total Groundwater Extracted 32,000,000 gal (ARCO) <br /> Current Remediation Techniques Air Sparging (AS) (ARCO) <br /> TPHg Removed by SVE this quarter None (ARCO) <br /> Cumulative TPHg Removed by SVE 4,897 lbs (ARCO) <br /> MtBE Removed this Quarter None (ARCO) <br /> Cumulative MtBE Removed 4 5 lbs (ARCO) <br /> Approximate Depth to Groundwater 8 96— 12 82 ft <br /> Groundwater Flow and Gradient South @ 0 003 ft/ft <br /> This report presents our understanding of existing conditions at the subject site The conclusions <br /> contained herein are based on the analytical results, and professional judgment in accordance with <br /> current standards of professional practice, no other warranty is expressed or implied SECOR <br /> assumes no responsibility for exploratory borings or data reported by other consultants or <br /> contractors <br /> Should you have any questions or concerns regarding these activities, please feel free /0 <br /> Greg McIver at 916-861-0400, ext 279, or Rusty Benkosky at ext 229Q�JS <br /> Sincerely, ¢ NO 1:058399 m <br /> SECOR International Incorporated <br /> CML <br /> Greg Mclve Rusty Benko y, OF04Lt4d�' <br /> Project Manager Senior Eng eer <br /> t <br /> 11Chevron1942751Periodic Mon itoring\QMR1200312003 revised OMR Chev and Arcot doe <br />