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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 45) 404 N Wqg t Lane Walnut Creek CA 9459a (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 /> i <br /> Blame Tech Services, Inc Client Project ID ShellStockton/970905-F1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention FranThle Work Order# 9709144-01-03 Reported Sep 10, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#. MS090597MTBEH6A <br /> Analy Method EPA 826a <br /> Prep Method N A- <br /> Analyst M Williams <br /> MS/MSD# 9708134502 <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. 50Ng/L <br /> Result 47 <br /> 46S % 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: 50pg/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 is a control sample of known,interferent-free matrix that is 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 is to be used to validate the batch <br /> Peg Penner '"*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> ct Manager 9709144 BLA 45> <br />