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S E C O R <br /> Margaret Lagorio <br /> January 10, 2003 <br /> • Page 2 <br /> MW-9S at concentrations of 2 µg/I and 230 µg/I, respectively. TBA was detected in the samples <br /> collected from MW-9, MW-9A, and MW-9S at concentrations of 110 µg/l, 260 Ag/l, and 460 iug/l, <br /> respectively. EDB was detected in the sample collected from MW-9S at a concentration of 6 Ag/l. <br /> Groundwater elevation decreased across the site an average of approximately 1.276 feet from the <br /> previous quarter. Groundwater flow was to the southeast, at gradients ranging from 0.001 to 0.008 <br /> ft/ft, consistent with historical data. Additional groundwater samples, collected by SECOR this period <br /> to monitor the progress of ozone sparge pilot testing, will be reported in a future document. <br /> LIMITATIONS <br /> The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, <br /> Inc. Gettler-Ryan's report is attached. The data presented in this summary is accurate only to the <br /> degree implied by the sources and methods used. No warranty, expressed or implied, is made by <br /> SECOR. <br /> Should you have any questions or concerns regarding these activities, please feel free to contact <br /> . me. <br /> Sincerely, <br /> SECOR International Incorporated <br /> William E. Brasher, P.E. <br /> Project Manager <br /> ATTACHMENTS: <br /> Attachment A—November 20,2002 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc. <br /> cc: Bob Cochran, CEMC, P.O. Box 6004, San Ramon, CA 94583-0804 <br /> Marty Hartzell, RWQCB-CVR,3443 Routier Road, Suite A, Sacramento, CA 95827 <br /> Greyhound Lines, P.O. Box 660362, Dallas TX 75266-0362 <br /> i <br /> i <br /> I:IChevron1905571Periodic Mon itoring1200214Q2002 QMR.doc SECOR International Incorporated <br />