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Sequoia 680 Chesapeake Drive 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 St-k,,Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/9-8264 <br /> 17170 Keaton Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order # 9602708 20 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21396BTEX21A GCO21396BTEX21A GCO21396BTEX21A GCO21396BTEX21A <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J woo J woo J woo <br /> MS/MSD # 960207609 960207609 960207609 960207609 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10,ug/L 10yg/L 10Ng/L 30jtg/L <br /> Result 10 10 10 30 <br /> 4vS % Recovery 100 100 100 100 <br /> Dup Result 10 10 11 31 <br /> MSD % Recov 100 100 110 103 <br /> RPD 00 00 95 33 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK021396 BLK021396 BLK021396 BLK021396 <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 10Ng/L 10yg/L 10pg/L 30,ug/L <br /> LCS Result 10 10 11 31 <br /> LCS % Recov 100 1GO 110 103 <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 />�EQUOIA 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 /> evin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9602708 TTT <4> <br /> i <br />