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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)3649233 <br /> 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(9 16)921-0100 <br /> Analytical1551 <br /> McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-%12 <br /> Gettler-llyan - Dublin Client Project ID Unocal 88#5098, Stockton <br /> 5747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9061562-579 Reported Jun 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# 9062599 9062599 9062599 9062599 <br /> Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Instrument I D # HP 5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20pg/L 20ug/L 20yg/L 60pg/L <br /> i <br /> Matrix Spike <br /> % Recovery 90 90 90 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 115 117 <br /> Relative % <br /> Difference 15 20 24 22 <br /> LCS Batch# 5LCS062599 5LCS062599 5LCS062599 5LCS062599 <br /> Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Instrument I D # HP 5 HP 5 HP 5 HP 5 <br /> LCS % <br /> Recovery 95 100 95 102 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> iL l� vi Gkvi,, J" the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> fJinterference,the LCS recovery is to be used to validate the batch <br /> Ilanne Fegley <br /> Project Manager <br /> 9061562 GET <11 <br /> J� <br />