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680 Chesapeake Drive Redwood Cary CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 404 N W1get lane Walnut Creek Ci 94598 (9ZS)988-9600 FAX(925)988-%73 <br /> 819 51r11er Avenue 5uite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 ell Bea North Ste l) Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> San 1551 industrialCarlos CA 94070-4111 (650)232 96W FAX(650)232-9612 <br /> Gettler-Ryan Dublin ` V Client Pro'ect`10 lJnocal 88#5886, Staci(ton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin,CA 94568 <br /> Attention Deanna Harding QC Sample Group 9060540-560 Reported Jun 17, 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# 9060370 9060370 9060370 9060370 <br /> Date Prepared 6/9/99 6/9/99 6/9/99 69/99 <br /> Date Analyzed 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20Ftg/L 20vg/L 60jug/L <br /> i <br /> Matrix Spike <br /> %Recovery 105 85 90 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 110 90 95 100 <br /> Relative% <br /> Difference 47 5 7 54 00 <br /> LCS Batch# 4LCS060999 4LCS060999 4LCS060999 4LCS060999 <br /> Date Prepared 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Date Analyzed 6/9/99 6/9/99 6/9/99 6/9/99 <br /> Instrument I D # HP 4 HP-4 HP 4 HP 4 <br /> LCS % <br /> Recovery 105 90 90 105 <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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Jullanne Fegley <br /> Project Manager <br /> 9060540 GET <30> <br />