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J ' <br /> Chevron Groundwater Monitoring Report(I Q2001) Page 2 of 2 <br /> Facility 49.6171 —6633 Pacific Avenue,Stockton,CA Date April 12,2001 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on February 16,2001 <br /> Seven wells were sampled during this event TPHg was reported in all of the wells sampled at concentrations <br /> ranging from 83 0 ppb in MW-5 to 501 ppb in MW-2 Benzene was reported at concentrations of 694 ppb in <br /> MW-2 and 8 24 ppb in OW-1 MtBE was reported concentrations of 6 85 ppb in MW-6 and 540 ppb in OW-1 <br /> The MtBE concentrations in OW-1 were confirmed through analysis by EPA Method 8260 with a result of 610 ppb <br /> Groundwater elevations across the site increased an average of approximately 0 02 feet this quarter Groundwater <br /> flow was to the northeast at 0 007 to 0 008 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 /> "Hofm <br /> Protect Manager <br /> ATTACHMENTS: <br /> • Table I —Screen Intervals <br /> • Attachment A—March 9,2001 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 /> Wilbur Smith I1, Sims-Grupe Management, 374 Lincoln Center, Stockton, CA 95207 <br /> Donald Bradshaw, Levine-Fricke-Recon, 1900 Powell Street, 12`h Floor, Emeryville,CA 94608-1827 <br />