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fi� rt <br /> Chevron Groundwater Monitoring Report QQ2001) Page 2 of 2 <br /> Facility 49-6171—6633 Paci tic Avenue,Stockton,CA Date October 1,2001 <br /> DISCUSSION. <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on duly 12,2001 Thirteen <br /> wells were monitored and sampled TPHg was detected in eight of the thirteen wells sampled at concentrations <br /> ranging from 84 µg/l in the sample collected from MW-5 to 220µg/1 in the sample collected from MW-7 Benzene <br /> was detected at a concentration of 0 75 µg/l in the sample collected from MW-6 MtBE was detected in samples <br /> collected from three wells at concentrations of 5 µg/l in MW-5,9 6 µg/l in MW-6, and 1,200 µg/l in MW-8 The <br /> MtBE concentrations were confirmed through analysis by EPA Method 8260 Results of the confirmation analysis <br /> were less than the method detection limit of 2 0 pg/l in the sample collected from MW-5, 7 5 µg/l in the sample <br /> collected from MW-6, and 900 µg/l in the sample collected from MW-8 The depth to groundwater increased <br /> across the site an average of approximately 0 85 feet this quarter <br /> LIMITATIONS: <br /> The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc Gettler- <br /> Ryan's report is attached The data presented in this summary is accurate only to the degree implied by the sources <br /> and methods used No warranty,expressed or implied, is made by SECOR <br /> If you have any questions, please feel free to call us at(916) 861-0400 <br /> Sincerely, <br /> SECOR International Inc <br /> ti <br /> William E Brasher, P E <br /> Project Manager <br /> ATTACHMENTS. <br /> • Table I --Screen Intervals <br /> • Attachment A—August 10, 2001 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc <br /> cc Bob Cochran, Chevron Products Company, P O Box 6004, San Ramon, CA 94583-0804 <br /> Marty Hartzell, RWQCB-CVR, 3443 Routier Road, Suite A, Sacramento, CA 95827 <br /> Wilbur Smith Il, Sims-Grupe Management, 374 Lincoln Center, Stockton,CA 95207 <br /> Donald Bradshaw, Levine-Fricke-Recon, 1900 Powell Street, 12" Floor, Emeryville, CA 94608-1827 <br />