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S E C 0 R <br /> Ms Victoria McCartney <br /> . October 27, 2003 <br /> Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 10 Concentration In pg/L(Well ID) Concentration in prg/L(Well ID) <br /> Total Samples <br /> TPHg 4 170(MW-4) 2,200(MW 6S) <br /> Benzene 0 ND — NDb� <br /> MtBE 4 1,600(MW-4) 31,000(MW'59�}Q- <br /> Definitions <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> ND =Non Detect <br /> Should you have any questions or concerns regarding these activities, please feel free to contact me <br /> at (916) 861-0600, extension 234 <br /> Sincerely, <br /> SECOR International Incorporated <br /> >1dMva <br /> Project Manager <br /> ATTACHMENTS <br /> Attachment A— September 12, 2003, Groundwater Monitoring & Sampling Report by Gettler- <br /> Ryan Incorporated <br /> cc Mr Robert J Cochran, Chevron Environmental Management Company, San Ramon, CA <br /> Mr Jim Barton, Regional Water Quality Control Board, Sacramento, CA <br /> • <br /> 11Chevron1914521Penodic Monitonng1200313Q2003 QMR 91452 doc SECOR lntemat►onal Incorporated <br />