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Chevron Groundwater Monitoring Report QQ2001) Page 2 of 2 Facility #9-2033—508 WLst Charter Way,Stockton,CA Date October 12,2001 DISCUSSION: Gettler-Ryan Inc performed this groundwater monitoring and sampling event for groundwater monitoring wells MW-1, MW-2 and MW-3 on August 16, 2001 Sequoia Analytical of Walnut Creek, California performed laboratory analysts of groundwater samples Each groundwater sample was analyzed for total petroleum hydrocarbons as gasoline(TPHg),benzene,toluene, ethyl benzene and xylenes(BTEX), and methyl tertiary butyl ether(MtBE) Groundwater from monitoring well MW-1 was also analyzed for total petroleum hydrocarbons as diesel (TPHd), MtBE (confirmation)by EPA Method 8260B, purgeable halocarbons by EPA Method 8021, semi- volatile organics by EPA Method 8270, total recoverable petroleum hydrocarbons(TRPH)by American Public Health Association(APHA)/EPA Methods and dissolved metals including cadmium,chromium, nickel, lead and zinc by EPA Method 200 The laboratory results for groundwater from MW-1 reported TPHd 170 lig/l, and MtBE(confirmation)at 1,200 µg/l No other target analytes in MW-1 were detected No target analytes were detected in samples from MW-2 Laboratory results for groundwater from MW-3 contained total petroleum hydrocarbons as gasoline(TPHg)at a concentration of 5,800 µg11, benzene at 550 µg11,and MtBE at 360 µg/1 Groundwater elevations generally increased across the site when compared with the previous monitoring event Groundwater flow was to the north at 0 02 ft/ft 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 is 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 Intern tional Inc r ott Gable Senior Geologist ATTACHMENTS• • Attachment A—September 11, 2001 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 Pearl Myer, 1120 South Hunter Street, Stockton, CA 95206