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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9133 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (510) 988 %00 FAX(510)988-%73 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc l Client Project ID Shell Stockton/971222-F1 <br /> ,1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> L,Attention Fran Thie Work Order# 9712F01 -01, 03-07 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#- MS122697MTBEH6A <br /> Analy. Method. EPA 8260 <br /> Prep. Method N A <br /> Analyst M Williams <br /> MS/MSD# 9712DO302 <br /> Sample Conc N D <br /> Prepared Date 12/26/97 <br /> Analyzed Date 12/26/97 <br /> Instrument I.D # H6 <br /> Conc Spiked 50 Ng/L <br /> Result 48 <br /> MS % Recovery 96 <br /> Dup Result 48 <br /> MSD % Recov.• 96 <br /> RPD 00 <br />- RPD-L1mft:------= 0-25 <br /> LCS #• LCS 123097 <br /> Prepared Date 12/30/97 <br /> Analyzed Date 12/30/97 <br /> Instrument LD #- H6 <br /> Conc Spiked 50Ng/L <br /> LCS Result: 49 <br /> LCS % Recov.: 98 <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 reagent <br /> SE ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure I <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 /> g y Penner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712F01 BLA <1> <br />