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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> friw� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9604 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 98071-183-04 Reported Aug 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS080698MTBEH6A <br /> Anally Method EPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD# 9807DO901 <br /> Sample Conc N D <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50,ug/L <br /> Result 59 <br /> MS % Recovery 118 <br /> . Dup Result 63 <br /> MSD % Recov 126 <br /> RPD 66 <br /> RPD Limit 0-25 <br /> LCS # BLK080598 <br /> Prepared Date 8/5/98 <br /> Analyzed Date 8/5/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50ug/L <br /> LCS Result 55 <br /> LCS % Recov 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> Tne LCS ss a control sample or known,interferenr-free mdtnx that is analyzed using the same reagents <br /> I ANALYTICAL 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 /> rference,the LCS recovery m to be used to validate the batch <br /> P gg Penner <br /> P le t Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 98071-183 BLA <4> <br />