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Sequoia 660 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Ci) 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 /> s r v t r r 1 » r r • r yr r ♦ti r , r n r i <br /> Blaine Tech Services, Inc' Client Project IDr�}'$hell Stockton / 971202-1-1 r h r <br /> 1680 Rogers Ave Matrix Liquid r <br /> San Jose, CA 95112 <br /> 4 Attention Fran Thie Work Order# 9712358-01-07, 9712360-13-15 Reported Dec 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS120997MTSEH6A <br /> Analy Method: EPA 8260 <br /> Prep Method: NA <br /> Analyst: M Williams <br /> MS/MSD #• 971238902 <br /> Sample Conc • N D <br /> Prepares[ Date 12/9/97 <br /> Analyzed Date 12/9/97 <br /> Instrument I D.# H6 <br /> Conc. Spiked 50 fig/L <br /> Result 54 <br /> MS % Recovery 108 <br /> Dup. Result 52 <br /> MSD % Recov.• 104 <br /> RPD 38 <br /> RP-D Limit.�0.25 <br /> LCS #. LCS120997 <br /> Prepared Date: 12/9/97 <br /> Analyzed Date: 112/9/97 <br /> Instrument LD #: H6 <br /> Conc. Spiked: 50ug/L <br /> LCS Result: 46 <br /> LCS %Recov.: 92 <br /> 80-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagen <br /> SJgyp <br /> N LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sam <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <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 /> PPger *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9712358 BLA <8> <br />