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a— ) <br /> 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget 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)79Z-1865 FAX(707)792-0342 <br /> Blame Tech Services, Inc Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9807H87-01, 04, 06-09 Reported Aug 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#- MS080198MTBEH6A <br /> Anally Method- BPA 8260 <br /> Prep Method: N A <br /> Analyst: M Williams <br /> MS/MSD# 98071-18706 <br /> Sample Conc N e <br /> Prepared Date 8/1/98 <br /> Analyzed Date 8/1/98 <br /> -Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 49 <br /> MS % Recovery 98 <br /> Dup Result 49 <br /> MSD % Recov. 98 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS #- LCS080198 <br /> Prepared Date* 8/1/98 <br /> Analyzed Date- 8/1/98 <br /> Instrument I D #` H6 <br /> Conc Spiked: 50ug/L <br /> LCS Result 47 <br /> LCS % Recov 94 <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 /> S A LYTICAL 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 /> P g y Penner <br /> Pr ct Manager *" IVIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9807H87 BLA <3> <br />