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E C ® R <br /> Jeffrey Wong ` <br /> October 27, 2003 <br /> . Page 2 r <br /> r <br /> S <br /> z <br /> s <br /> 4 <br /> J <br /> 1 <br /> Number of Detections <br /> above the MDL of the 7 Minimum Maximum <br /> Constituents Total Samples Concentration in pg/L(Well ID) Concentration In pgfL(Well ID) <br /> TPHg 0 ND ND <br /> Benzene 0 ND ND a <br /> MtBE 5 3(MW-5) 93(MW-2) g <br /> Definitions <br /> MDL=Method detection limit TPHg=Total petroleum hydrocarbons as gasoline <br /> pglL=Micrograms per liter MtBE=Methyl tertiary butyl ether <br /> ND =Constituent detected below the laboratory reporting limits <br /> Should you have any questions or concerns regarding these activities, please feel free to contact me <br /> at 916-861-0400 extension 283 <br /> • Sincerely, <br /> SECOR International Incorporated <br /> El6b W Jackson Jr <br /> Staff Geologist <br /> 1 <br /> Attachments <br /> i <br /> Attachment 1 Groundwater Monitoring & Sampling Report by Gettler-Ryan, Dated May 13, 2003 <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 Joseph Budiselich,Stockton, CA <br /> Mr Kevin Lee, Subway, Stockton, CA <br /> 11Chevron1998401Periodic Monitonng120031302003 QMR 99840 Rev A doc SECOR Intemational Incorporated <br />