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` Sequoia680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W,,,,,Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9573 <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 Shell Stockton /970905-F1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9709144-01-03 Reported Sep 10, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS090597MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD # 9708G4502 <br /> Sample Conc N D <br /> Prepared Date 9/5/97 <br /> Analyzed Date 9/5/97 <br /> Instrument I D # H6 <br /> Conc Spiked. 50 fig/L <br /> Result 47 <br /> �S % Recovery 94 <br /> Dup Result 49 <br /> MSD % Recov 98 <br /> RPD 42 <br /> RPD Limit 0-25 <br /> LCS # VDBO90697 <br /> Prepared Date 9/6/97 <br /> Analyzed Date 9/6/97 <br /> Instrument I D #. H6 <br /> Conc Spiked: 50Ng/L <br /> LCS Result 46 <br /> LCS % Recov: 92 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> U 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 /> interference,the LCS recovery 1s to be used to validate the batch <br /> PegPenner **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference <br /> ct Manager 9709144 BLA <5> <br />