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•t i �� Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 otoo <br /> �IlF <br /> Envlros 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 -01 Reported Nov 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC111096BTEX02-A GC111096BTEX02A GC1110963TECO2A GC1 1 1096BTEX02A <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 Helder J Heider J Helder <br /> MS/MSD# 961118612 961118612 961118612 961118612 <br /> Sample Conc N D N D 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 1 D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 12 10 10 28 <br /> MS % Recovery 120 10 100 95 <br /> Dup Result- 12 10 98 28 <br /> MSD % Recov 120 100 98 93 <br /> RPD 00 00 20 18 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> LCS#- BLK111096 BLK111095 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 #. GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc. Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result 12 99 94 27 <br /> LCS % Recov . 120 99 94 89 <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 /> interference,the LCS recovery is to be used to validate the batch <br /> Mike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate RPD=Relative%Difference 9611429 EEE 41> <br />