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� Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX (415) 364 9233 <br /> vy~ , 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Enviros Client Project ID Shell 620 W Charter, Stockton <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Matt Donohue Work Order# 9611429 -02 Reported Nov 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC111096BTEX17A GC111096BTEX17A GC111096BTEX17A GC111096BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Heider J Heider J Helder J Helder <br /> MS/MSD# 961118405 961118405 961118405 961118405 <br /> Sample Cone ND ND N D N D <br /> Prepared Date. 11/10/96 11/10/96 11/10/96 11/10/96 <br /> Analyzed Date 11/10/96 11/10/96 11/10/96 11/10/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10pg/L 10fig/L 10,ug/L 30ug/L <br /> Result: 10 99 96 29 <br /> MS %Recovery 100 99 96 96 <br /> I*1 Dup Result 10 10 9 8 30 <br /> MSD % Recov 100 100 98 100 <br /> RPD 00 10 21 37 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK111096 BLK111096 BLK111096 BLK111096 <br /> Prepared Date 11/10/96 11/10/96 11/10/96 11/10/96 <br /> Analyzed Date 11/10/96 11/10/96 11/10/96 11/10/96 <br /> Instrument I D#' GCHP17 CCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 fig/L 10pg/L 10 fag/L 30pg/L <br /> LCS Result 10 10 98 30 <br /> LCS %Recov 100 100 98 100 <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 /> SEQUOIA 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 /> j� interference,the LCS recovery is to be used to validate the batch <br /> Ike Gregory <br /> Project Manager **NIS Matrix Spike, MSD=MS Duplicate, RPD Relative%Difference 9611429 EEE <2> <br />