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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)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) 92t %00 FAX(916)921 0100 <br /> 0 <br /> Blaine'Tech Services, Inc Client Project ID Shell Stockton /971121-G2 <br /> 1680 Rogers Ave Matrix Liquid <br /> f San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 971194-04-05, 07 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch#- MS120497MTBEF3A <br /> Analy. Method EPA 8260 <br /> Prep Method N A. <br /> Analyst M Williams <br /> MS/MSD# 9711F9405 <br /> Sample Cone 5 8 <br /> Prepared Date 12/4/97 <br /> Analyzed Date. 12/4/97 <br /> Instrument I D #- F3 <br /> Cone Spiked 50ug/L <br /> Result 55 <br /> MS % Recovery 9e <br /> • Dup Result 58 <br /> MSD %Recov .. 104 <br /> RPD: 53 <br /> RPD Limit 0-25 <br /> LCS #- VMB120497 <br /> Prepared Date- 12/4/97 <br /> Analyzed Date. 12/4/97 <br /> Instrument I D #• F3 <br /> Cone. Spiked 50ltg/L <br /> LCS Result: 51 <br /> LCS %Recov 102 <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 /> �E ALYTICAL 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 gg P neer <br /> P t Manager "*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9711E94 BLA <4> <br />