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Second Quarter 2003, Groundwater Monitoring Report <br /> July 30, 2003 <br /> . Page 3 <br /> field and laboratory procedures Attachment 3 contains Chevron laboratory analytical results, chain- I <br /> of-custody documentation, and field data sheets Attachment 4 contains ARCO laboratory analytical <br /> results, chain-of-custody documentation, 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 1$'and 3rd quarters only <br /> Chevron - MW-1 through MW-9 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 7 14— 11 09 ft <br /> Groundwater Flow and Gradient North @ 0 002 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 to contact <br /> Scott E Gable at 916-861-0400, ext 231, or Rusty Benkosky at ext 229 <br /> Sincerely <br /> SEC D nterna nail rpora <br /> o ble, R G Rust Benkosky, P <br /> Ior Geologist Senior Engineer QQ,flFESSIO�, <br /> W NO C 058399 � <br /> it Exp <br /> 46 ST9 CMI. Q��Q <br /> OF CAI�F� <br /> I IChevron1942751PerLodic Mondoring\QMM200312003 revised OMR Chev and Arcot doc <br /> I <br /> i <br />