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Sequoia 680 Chesapeake Onve Redwood City, CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wi8et Lane Walnut Crede 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 /> { Blaine Tech Services, Inc Client Project ID Shell Stockton/ 971223-F1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9712F97 -01 Reported Jan 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte- MTBE <br /> QC Batch#: MS122697MTSEH6A <br /> Analy. Method EPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD #. 9712D0302 <br /> Sample Conc. N D <br /> Prepared Date 12/26/97 <br /> Analyzed Date: 12/26/97 <br /> Instrument I D # H6 <br /> Conc Spiked. 50pg/L <br /> Result 48 <br /> MS % Recovery: 96 <br /> Dup. Result 48 <br /> MSD % Recoil . 96 <br /> RPD. 00 <br /> RPD Limit: 0-25 <br /> LCS# LCS123097 <br /> Prepared Date- 12/30/97 <br /> Analyzed Date 12/30/97 <br /> Instrument I D #• H6 <br /> Conc Spiked: 50 pg/L <br /> LCS Result. 49 <br /> LCS % Recov .. 98 <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 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 /> P g enneC <br /> Pr ect Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative % Difference 9712F97 BLA <11> <br />