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Sequoia <br />Analytical <br />Ottler-Ryan - Dublin <br />6747 Sierra Court, Suite J <br />Dublin, CA 94568 <br />Attention Barbara Sleminski <br />680 Chesapeake Drive <br />Redwood City CA 94063 <br />404 N Wiget Lane <br />Walnut Creek. CA 94598 <br />819 Striker Avenue Suite 8 <br />Sacramento CA 95834 <br />1455 McDowell Blvd North Ste D <br />Petaluma. CA 94954 <br />Client Project ID Chevron #9-5775, Lodi <br />Matrix Solid <br />QC Sample Group 9020073-085 <br />QUALITY CONTROL DATA REPORT <br />(650)364-9600 <br />(925)988-9600 <br />(916) 921-9600 <br />(707) 792-1865 <br />FAX(650)364-9233 <br />FAX (925) 988-9673 <br />FAX (916) 921-0100 <br />FAX(707)792-0342 <br />Reported Mar 19, 1999 <br />ANALYTE <br />MTBE <br />Method <br />EPA 8260 <br />Analyst <br />N Nelson <br />MS/MSD <br />Batch# 9031116 <br />Date Prepared <br />3/12/99 <br />Date Analyzed <br />3/15/99 <br />Instrument I D # <br />GC/MS-2 <br />Conc Spiked <br />2500mg/kg <br />Matrix Spike <br />% Recovery 92 <br />Matrix Spike <br />Duplicate % <br />Recovery 104 <br />Relative % <br />Difference 12 <br />LCS. Batch# LCS031299B <br />Date Prepared 3/12/99 <br />Date Analyzed 3/12/99 <br />Instrument 1 D # GC/MS-2 <br />LCS % <br />Recovery 92 <br />% Recovery <br />Control Limits 70-130 <br />OUOIA ANALYTICAL, #1271 <br />ulianne Fegley <br />Project Manager <br />'lease 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 />ortihed 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 fall within specified control limits due to matrix <br />iterference, the LCS recovery is to be used to validate the batch <br />9020073 GET <3> <br />