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S E C ® R <br /> Mr Harlin Knoll <br /> July 30, 2004 <br /> • Page 2 <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 4 Concentration in pg/L(Well ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> TPHd 2 55(MW-3) 2 000(MW-4) <br /> TPHg 1 ND 16,000(MW-4) <br /> Benzene 0 ND ND <br /> MtBE 2 23(MW-4) 850(MW-3) <br /> Definitions <br /> MDL=Method detection limit <br /> pg/L= Micrograms per liter <br /> ND = Constituent reported below the laboratory reporting limits <br /> If you have any questions or concerns regarding these activities, please feel free to contact me at <br /> (916) 861-0400 extension 234 <br /> Sincerely, <br /> SECOR International Incorporated <br /> David M Evans <br /> Protect Manager <br /> Attachments <br /> Attachment A May 24, 2004, Groundwater Monitoring & Sampling Report by Gettler-Ryan <br /> 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 /> Mr Joe Neely, Cambria, Sonoma, CA <br /> i <br /> F <br /> 11Chevron%982641Penodic Mon itoring120041202004 QMtt 98264 doc SECOR lntematrona!Incorporated <br />