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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(65 0)364 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos CA 94070-4111 (450)232-9600 FAX(650)232-9612 <br />� <br /> ettler-Ryan- Dublin V Client Project ID Unocal SS#0123, "racy <br /> 747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding CC Sample Group 9061307-313 Reported .dun 30, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9061473 9061473 9061473 9061473 <br /> Date Prepared 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Date Analyzed 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conic Spiked 20ug/L 20 ug/L 20 pg/L 60 pg/L <br /> Matrix Spike <br /> Recovery 95 95 95 100 <br />. <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 95 95 97 <br /> Relative % <br /> Difference 54 00 00 3 4 <br /> LCS Batch# SLCS062399 5LCS062399 5LC8062399 5LCS062399 <br /> Date Prepared 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Date Analyzed 6/23/99 6/23/99 6/23/99 6/23/99 <br /> Instrument I D # HP-5 HP 5 HP-5 HP 5 <br /> LCS % <br /> Recovery 95 95 95 100 <br /> Recovery <br /> Control Limits 70 130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> / -1`1 fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> mv� <br /> L v`-e(4'�;;j(C���� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recoveryis to be used to validate the batch <br /> Ilanne Fegley <br /> Project Manager <br /> 9061307 GET <10> <br /> r� <br />