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Sequoia 680 Chesapeake Drive Redwood City CA 44063 (415) 364 9600 FAX(415) 364 9233 <br /> `� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Iwo— <br /> Blaine Tech Services, Inc Client Project ID Steell Stockton / 961025-H1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 961 OH37-09 Reported Nov 14, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> GSC Batch# MS110896MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N/A <br /> Analyst M Williams <br /> MS/MSD# 961OH3709 <br /> Sample Cone 25 <br /> Prepared Date - <br /> Analyzed Date 11/8/96 <br /> instrument I D # F3 <br /> Cone Spiked 50pg/L <br /> Result 47 <br /> MS % Recovery 89 <br /> Dup Result 50 <br /> MSD % Recov 95 <br /> RPD 62 <br /> RPD Limit 0-25 <br /> LCS # VDB110896 <br /> Prepared Date - <br /> Analyzed Date 11/8/96 <br /> Instrument I D # F3 <br /> Conc Spiked 50pg/L <br /> LCS Result 47 <br /> LCS % Recov 94 <br /> MS/MSD 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> � f The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> SE UaA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> f 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 /> PeggyyRenner <br /> Project Manager MS=Matrix Spike, MSD=MS Duplicate RPD=Relative % Difference 961OH37 BLA <7> <br />