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Chevron Groundwater Monitoring Report(I Q2002) Page 2 of 2 <br /> Facility 49-2033—508 West Charter Way,Stockton,CA Date April 9 2002 <br /> �4 <br /> 1 <br /> DISCUSSION: <br /> Gettler-Ryan Inc performed this groundwater monitoring and sampling event for groundwater monitoring wells <br /> MW-1, MW-2 and MW-3 on February 14, 2002 Each groundwater sample was analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg),benzene,toluene,ethyl benzene and xylenes(BTEX), and methyl tertiary butyl <br /> ether(MtBE) Groundwater from monitoring well MW-1 was also analyzed for total petroleum hydrocarbons as <br /> diesel (TPHd), MtBE(confirmation)by EPA Method 8260B,purgeable halocarbons by EPA Method 8021, semi- <br /> volatile organics by EPA Method 8270,total recoverable petroleum hydrocarbons(TRPH)by EPA Method 418 1, <br /> and dissolved metals including cadmium, chromium,nickel, lead and zinc by EPA Method 6010E <br /> The laboratory results for the sample collected from MW-I reported TPHd 1000 µg11,TPHg at 230 ligll , Benzene <br /> at 0 53 Vig/I, MtBE (confirmation)at 890 pg/l, Pb at 23 4 µg11, and Zn at 18 3 gg/l No other target analytes in MW- <br /> 1 were detected Benzene was detected from the sample collected from MW-2 at a concentration of 2 2 pg/l No <br /> other target analytes were detected in samples from MW-2 Laboratory results for the sample collected from MW-3 <br /> detected TPHg at a concentration of 6,800 µg/l, and benzene at a concentration of 330 }tg/l <br /> Groundwater elevations generally increased across the site approximately 1 34 ft when compared with the previous <br /> monitoring event Groundwater flow was to the east at 0 004 ft/f# <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 /> i <br /> ott Gable <br /> Senior Geologist <br /> ATTACHMENTS: <br /> • Attachment A—March 20, 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 /> Pearl Myer, 1120 South Hunter Street, Stockton,CA 95206 <br />