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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX (650) 364-9233 <br />a-)404 N Wlget Lane Walnut Creek. CA 94598 (925) 988-9600 FAX (925) 988-9673 <br />Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 911-9600 FAX (916) 921-0100 <br />1455 McDowell Blvd North Ste D Petaluma, CA 94954 (707) 791-1865 FAX (707) 792-0342 <br />4 =ttler-Ryan - Dublin <br />47 Sierra Court, Suite J <br />Dublin, CA 94568 <br />Attention Steve Carter <br />Client Project ID Chevron #9-5775, Lodi <br />Matrix Solid <br />QC Sample Group 8090034-035 <br />QUALITY CONTROL DATA REPORT <br />Reported Sep 3, 1998 <br />i <br />ANALYTE <br />MTBE <br />Method <br />EPA 8260 <br />Analyst <br />N Nelson <br />MS/MSD <br />Batch# 8090034 <br />Date Prepared <br />9/1/98 <br />Date Analyzed <br />9/3/98 <br />Instrument I D # <br />GC/MS-2 <br />Conc Spiked <br />2500,ug/kg <br />Matrix Spike <br />% Recovery <br />112 <br />l4kMatrix Spike <br />Duplicate % <br />Recovery <br />116 <br />Relative % <br />Difference <br />35 <br />LCS Batch# <br />LCS090198 <br />Date Prepared <br />9/1/98 <br />Date Analyzed <br />9/1/98 <br />Instrument I D # <br />GC/MS-2 <br />LCS % <br />Recovery <br />88 <br />Recovery <br />Control Limits 65-135 <br />SEQUOIA ANALYTICAL, #1271 <br />.-4 <br />te Fegley <br />Project Manager <br />Please Note <br />The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br />preparation, and analytical methods employed for the samples The matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br />the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />interference, the LCS recovery T to be used to validate the batch <br />ON <br />8090034 GET <3> <br />