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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX (650) 364-9233 <br />6) 404 N Wiget Lane Walnut Creek. CA 94598 (925) 988-9600 FAX (925) 988-9673 <br />l 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX (916) 921 -0100 <br />� Analytica <br />1455 McDowell Blvd North Ste D Petaluma. CA 94954 (707) 792-1865 FAX (707) 792-0342 <br />I ler-Ilyan - Dublin <br />17. Sierra Court, Suite J <br />Dublin, CA 94568 <br />Attention Barbara Sieminski <br />Client Project ID Chevron #9-5775, Lodi <br />Matrix Liquid <br />OC Sample Group 9020622-626 <br />QUALITY CONTROL DATA REPORT <br />Reported Feb 17, 1999 <br />ANALYTE <br />MTBE <br />Method <br />EPA 8260 <br />Analyst <br />N Nelson <br />MS/MSD <br />Batch# 9020043 <br />Date Prepared <br />2/19/99 <br />Date Analyzed <br />2/11/99 <br />Instrument I D # <br />GC/MS-2 <br />Conc Spiked <br />50 pg/L <br />Matrix Spike <br />% Recovery 106 <br />Matrix Spike <br />Duplicate % <br />Recovery* 106 <br />Relative % <br />Difference 00 <br />LCS Batch#. LCS021199 <br />Date Prepared: 2/11/99 <br />Date Analyzed 2/11/99 <br />instrument I.D #- CC/MS-2 <br />LCS % <br />Recovery 114 <br />Recovery <br />Control Limits. 70-130 <br />SEQUOIA ANALYTICAL, #1271 <br />4^�-vt �'* <br />tanne Fegley <br />Project Manager <br />Nease Note <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />)reparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br />ortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br />he recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br />nterference, the LCS recovery is to be used to validate the batch <br />9020622 GET <5> <br />