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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (5t0) 988 9600 FAX(510)988-%73 <br /> AwAnalytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> `Blaine Tech Services, Inc v Client Prosect ID Shell Stockton �971222-F1 x. A <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9712FOl-08 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> OC Batch#: MS123097MTBEH6A <br /> Analy Method- EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 9712P5003 <br /> Sample Coni • N D <br /> Prepared Date 12/30/97 <br /> Analyzed Date 12/30/97 <br /> Instrument I D # H6 <br /> Conc. Spiked 50 fig/L <br /> Result: 46 <br /> MS % Recovery- 92 <br /> Dup Result 47 <br /> MSD % Recov 94 <br /> RPD 22 <br /> RPD-Llmit:�o-2s— ---- - — --- - -- -- — - ------ - — -— - - <br /> LCS # LCS123197 <br /> Prepared Date 12/31/97 <br /> Analyzed Date: 12/31/97 <br /> Instrument 1 D.#: F2 <br /> Conc Spiked. 50pg/L <br /> LCS Result 55 <br /> LCS % Recov 110 <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 reagen <br /> SE IAALIYTICAIL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of samp <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 /> Pe en er <br /> Project anager **MS=Matrix Spike, MSD-MS Duplicate,RPD=Relative%Di ference 9712Fp1 BLA <3> <br />