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�r Chevron Groundwater Momtonng Report(2Q2002) Page 2 of 2 Facility #9-3232—8660 Lower Sacramento Road,Stockton,CA Date July 15,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on Aprtl 24 and 25,2002 MW-6D was sampled on May 14,2002 due to well development complications Groundwater samples were collected from ten wells during this event TPI-Ig was detected in samples collected from six of the ten wells,at concentrations ranging from 320µgll in the sample collected from MW-2,to 9,400µglt m the sample collected from MW-41) Benzene was detected in samples collected from five of the ten wells,at concentrations ranging from 2 5 µgll in the sample collected from MW-5D to 2,400 µg/1 in the sample collected from MW-4D MtBE was detected in samples collected from two of the ten wells,at concentrations of 8 µg/l in the sample collected from MW-3 and 6 µg/1 in the sample collected from MW-4D using EPA Method 8260 Depth to water across the site decreased by an average of approximately 0 87 feet from the previous quarter The groundwater flow direction was to the southeast at 0 002 to 0 003 ft/ft,conststent with the previous monitoring event LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan,Inc Gettler- Ryan's report is attached The data presented in this summary 1s accurate only to the degree implied by the sources and methods used No warranty,expressed or implied, is made by SECOR If you have any questions,please feel free to call us at(916) 861-0400 Sincerely, SECOR International Inc Brian Silva Project Manager ATTACHMENTS: Attachment A—June 21,2002 Groundwater Monitoring&Sampling Report by Gettler-Ryan Inc cc Bob Cochran,Chevron Products Company,P O Box 6004,San Ramon,CA 94583-0804 Marty Hartzell,RWQCB-CVR,3443 Routier Road,Suite A,Sacramento,Ca 95827 Richard Berger,Berger&Company,667 East Canal Drive,Turlock,CA 95380-4095