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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 8 Concentration in pg1L(Weil ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> TPHd 2 72(MW-7) 100(MW-2) <br /> TPHg 2 53(MW-7) 290(MW-2) <br /> Benzene 3 0 8(MW-4&MW-7) 38(MW-2) <br /> MtBE 4 9(MW-3) 180(MW-2) <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 /> 2- <br /> avid M Evans <br /> Project Manager <br /> Attachments <br /> Attachment A May 28, 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, Rancho Cordova, CA <br /> Mr Rudy Sanchez,Tracy Express Wash & Lube, Tracy,CA <br /> Ms Stella Rickman, Tracy, CA <br /> Ms Kathryn Pudenz, San Francisco, CA <br /> Mr Robert Kitay,Aquascience, Danville, CA <br /> 1 1Chevron1986321Penodic Morntoring1200412Q2004 QMR 98632 doc SECOR International Incorporated <br />