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S 1EC0R <br /> Third Quarter 2004, Groundwater Monitoring Report <br /> November 10, 2004 <br /> . Page 4 <br /> fourth quarter 2004. Based on a review of historical groundwater analytical data collected from wells <br /> MW-4, MW-7, and MW-8 located at the CHEVRON service station site, SECOR recommends a <br /> reduction of the sampling frequency of these wells from quarterly to semi-annually during the first <br /> and third quarters. Although well MW-8 is located in close proximity to City of Stockton Municipal <br /> Weil #10, continued quarterly monitoring and sampling of nearby well MW-6 is a sufficient sentry well <br /> for monitoring the off-site dissolved plume in this area. The reduced sampling frequency will <br /> coincide with the modified sampling schedule that was implemented at the ARCO service station <br /> beginning in the fourth quarter 2003, upon SJCEHD approval granted in correspondence dated <br /> November 12, 2003. Depth to groundwater will continue to be monitored in wells MW-4, MW-7, and <br /> MW-8 on a quarterly basis for the purpose of confirming groundwater flow direction and hydraulic <br /> gradient across the site. Upon SJCEHD approval, SECOR is prepared to implement the proposed <br /> revised sampling schedule during the fourth quarter 2004. <br /> STATEMENT OF LIMITATIONS <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 /> Rusty Benkosky at 916-861-0400, ext. 229. <br /> Sincerely, <br /> SECOR !rite ational Incorporated <br /> S /z <br /> Clinton Harms Rusty Benkosky, P. <br /> Associate Scientist Senior Engineer <br /> OQFtpFESS1 <br /> CO FO <br /> C.0 Qr <br /> LLJC 58399rri <br /> EXR 12/31/2006 <br /> { �_ 10-0y <br /> s� cfvll_ <br /> �TFOFCAI <br /> i <br /> I:IChevron194275Teriodic Monitoring\Q M R1200413QO4.doc <br />