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Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 <br /> Facility #9-2033—508 West Charter Way,Stockton CA Date October 22,2002 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on August 23,2002 <br /> Groundwater monitoring and sampling data was collected from wells MW-1, MW-2,and MW-3 Each <br /> groundwater sample was analyzed for total petroleum hydrocarbons as gasoline(TPHg),benzene,toluene, ethyl <br /> benzene and xylenes(BTEX), and methyl tertiary butyl ether(MtBE) Groundwater samples collected from <br /> monitoring well MW-1 were also analyzed for total petroleum hydrocarbons as di %a (�TPHd), purgeable <br /> halocarbons by EPA Method 8021, semi-volatile organics by EPA Method 8270`�totahrecoverable petroleum <br /> hydrocarbons(TRPH)by EPA Method 418 1,and dissolved metals including cadmium, chromium,nickel, lead and <br /> zinc by EPA Method 6010B /a,3, ����� 4"11't. V� <br /> Results of the sample collected from MW-1 reported TPHd at a concentration of 430 micrograms per liter(Vg/1), <br /> TPHg at a concentration of 190 pg/l , MtBE at a concentration (850 µg11,and total oil and gas(TOG) at a <br /> concentration of 510 pg/l No other target analytes in MW-1 were detected No target analytes were detected in <br /> samples from MW-2 Laboratory results for the sample collected from MW-3 detected TPHg at a concentration of L <br /> 7,000 pg/l, and benzene at a concentration of 470 µg/l -also told.-n-- 31,u11+-',eA1()74n2e4X_ i764*s K i 'c�1�+� <br /> V"m <br /> Groundwater elevations generally decreased across the site by approximately 1 35 feet when compared with the <br /> previous monitoring event Groundwater flow was to the cast/northeast at 0 007 ft/ft <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 /> Greg McIver <br /> Project Manager <br /> ATTACHMENTS: <br /> • Attachment A—October 4,2002 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 />