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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)344-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-034Z <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-9840/981223-1-1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order # 9812G28-01-03 Reported Jan 12, 1999 <br /> DUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS123198MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 981291302 <br /> Sample Conc N a <br /> Prepared Date 12/31/98 <br /> Analyzed Date 12/31/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50gg/L <br /> Result 44 <br /> MS % Recovery 88 <br /> Dup Result 46 <br /> MSD % Recov 92 <br /> RPD 44 <br /> RPD Limit 0-25 <br /> LCS # LCS123198 <br /> Prepared Date 12/31/98 <br /> Analyzed Date 12/31/98 <br /> Instrument I D # Hs <br /> Conc Spiked 50Pg/L <br /> LCS Result 45 <br /> LCS % Recov 90 <br /> i <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <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 preparation and analytical methods employed for the samples The matrix spike is ars 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 fail within specified control limits due to matrix <br /> / interference the LCS recovery is to be used to validate the batch <br /> cry <br /> roji Manager **MIS=Matrix Spike, MSD=MS Duplicate RPO=Relative% Difference 9812G28$LA c3> <br /> 2� <br />