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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX (415) 364-9233 <br /> 404[J Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5I0) 988-9673 <br /> lip- Analytical 819 Str,ker Avenue Suit,8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970226-K1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702F41 01,02,04 Reported Mar 19, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#- GC03069713TEX21A GCO30697BTEX21A GCO30697BTEK21A GC030697BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD# GW9702C5404C GW9702C5404C GW9702C5404C GW9702C5404C <br /> Sample Conc ND N D N D ND <br /> Prepared Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Instrument I D #' GCHP-21 GCHP-21 GCHP-21 GCHP-21 <br /> Conc Spiked 10pg/L long/L lopg/L 30pg/L <br /> Result 9 3 92 94 28 <br />. MS % Recovery 93 92 94 93 <br /> Dup Result 10 99 10 31 <br /> MSD % Recov 100 99 100 103 <br /> RPD 73 73 62 10 <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS # BLK030697 BLK030697 BLK030697 BLK030697 <br /> Prepared Date: 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Instrument I D # GCHP-21 GCHP-21 GCHP-21 GCHP-21 <br /> Conc Spiked 10,ug/L - 10pg/L 10pg/L 30pg/L <br /> LCS Result: 10 99 10 31 <br /> LCS % Recov• 100 99 100 103 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 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 /> OIA 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 /> egg ginner <br /> Prdject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9702F41 BLA <1> <br />