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Chevron Groundwater Monitoring Report(1Q2001) Page 2 of 2 <br /> Facility 49-3232—8660 Lower Sacramento Road,Stockton CA Date April 17,2001 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on February 23,2001 <br /> Groundwater samples were collected from three wells during this event TPI-Ig was detected in samples collected <br /> from two wells,at concentrations of 1,600 ppb in MW-2 and 160 ppb in MW-3 Benzene was detected at <br /> concentrations of 33 ppb in a sample collected from MW-2 and 2 l ppb in a sample collected from MW-3 MtBE <br /> was detected in a sample collected from MW-3 at a concentration of 16 ppb using EPA Method 8260 TBA and <br /> I <br /> TAME were also detected in the sample collected from MW-3 at concentrations of 220 ppb and 2 6 ppb, <br /> respectively Groundwater elevations across the site increased an average of approximately 122 feet this quarter <br /> The groundwater flow direction was undetermined(historical data indicate an easterly flow direction) <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 Iric <br /> Witham E Brasher, P E <br /> Project Manager <br /> i <br /> I <br /> ATTACHMENTS: <br /> Attachment A—January 31,2001 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 /> Richard Berger, Berger& Company,667 East Canal Drive,Turlock, CA 95380-4095 <br />