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Chevron Groundwater Monitoring Report(2Q2001) Page 2 of 2 <br /> Facility #9-2033—508 West Charter Way Stockton,CA Date July 13,2001 <br /> DISCUSSION: <br /> Gettler-Ryan Inc performed this groundwater monitoring and sampling event on May 17,2001 Sequoia <br /> Analytical of Walnut Creek, California performed laboratory analysis of groundwater samples Each groundwater <br /> sample was analyzed for total petroleum hydrocarbons(TPH), benzene,toluene,ethyl benzene and xylenes <br /> (BTEX),and methyl tertiary butyl ether(MtBE) Groundwater from monitoring well MW-1 was also analyzed for <br /> semi-volatile organics by EPA Method 8270,total recoverable petroleum hydrocarbons(TRPH)by American <br /> Public Health Association(APHA)/EPA Methods and five metals by EPA Method 200 <br /> Laboratory results report the groundwater sample collected from MW-1 contained TPH as diesel (TPHd)at a <br /> concentration of 160 pg/i, and MtBE at a concentration of 1,300 pg/1 Zinc was reported at 120 pg/1 Analysts of <br /> water collected from MW-2 reported no target analytes Laboratory results report the groundwater sample from <br /> MW-3 contained total petroleum hydrocarbons as gasoline (TPHg)at a concentration of 6,900 ppb, benzene at 580 <br /> ppb, and MtBE at 100 ppb <br /> Groundwater elevations generally increased across the site when compared with the previous monitoring event <br /> Groundwater flow was to the east at 0 006 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 /> Jenior <br /> able Geologist <br /> ATTACHMENTS: <br /> • Attachment A—June 20, 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 /> Pearl Myer, 1120 South Hunter Street, Stockton, CA 95206 <br />