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Sequoia 680 Chesapeake Drive Redwood CLry,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 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> h Blaine Tech Services, Inc Client Project ID Shell Stockton /971202-Li <br /> 1680 Rogers Ave Matrix Liquid <br /> 5 <br /> ,San Jose, CA 95112 <br /> { Attention Fran Thie Work Order# 9712360-12 Reported Dec 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#. MS120997MTBEF3A <br /> Analy. Method: EPA 8260 <br /> Prep Method: N A <br /> Analyst M Williams <br /> MS/MSD # 971236012 <br /> Sample Conc : N D <br /> Prepared Date. 12/9/97 <br /> Analyzed Date 12/9/97 <br /> Instrument I D #. F3 <br /> Conc Spiked 50 ug/L <br /> Result: 45 <br /> MS % Recovery- 90 <br />• Dup Result 48 <br /> MSD % Recov 96 <br /> RPD: 65 <br /> RPD Limit- 0-25 <br /> LCS #- LCS120997 <br /> Prepared Date 12/9/97 <br /> Analyzed Date. 12/9/97 <br /> Instrument I D.#: F3 <br /> Conc Spiked: 50/J9/L <br /> LCS Result- 36 <br /> LCS % Recov 72 <br /> MS MSD 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 /> ISEA A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> eer <br /> nager **MS=Matrix Spike, MSD=M$Duplicate, RPD=Relative% Difference 9712358 BLA <9> <br />