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Chevron Quarterly Groundwater Monitoring Report QQ2000) Page 2 of 2 <br /> Facility: #9-0557— 139 South Center Street,Stockton,CA Date: December 15,2000 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc. on August 14,2000. Nine <br /> wells were sampled during this event. TPHg was reported in three wells at concentrations of 55 ppb in MW-2, <br /> 1,600 ppb in MW-7, and 36,000 ppb in MW-9. Benzene was reported in three wells at concentrations of 1.8 ppb in <br /> MW-2,98 ppb in MW-7, and 3,500 ppb in MW-9. MtBE was reported in three wells at concentrations of 10 ppb in <br /> MW-2,22 ppb in MW-7,and 880 ppb in MW-9. Groundwater analytical results are generally consistent with <br /> historical data. Groundwater elevations across the site decreased an average of approximately 1.13 feet this quarter. <br /> Groundwater flow was to the southeast at 0.002 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 /> doge offmore <br /> Project Manager <br /> ATTACHMENTS: <br /> • Attachment A—November 14,2000 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 /> Tom Portele, Greyhound Lines, P.O. Box 660362, Dallas TX 75266-0362 <br /> Ron Chinn, SECOR International Inc., 1225 Pear Avenue., Suite 110,Mountain View,CA 94043 <br />