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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 /> IIo Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 0 <br /> Touchstone Developments Client Project ID Chevron 9-8264 / 8264 <br /> 17170 Keaton Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order # 9602707 17 Reported Feb 16, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21396BTEX21A GCO21396STEX21A GCO213968TEX21A GCO21396BTEX21A <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 Woo J Woo J Woo J Woo <br /> MS/MSD # 960207609 960207609 950207609 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 10pg/L 10,ug/L 10pg/L 30,ug/L <br /> Result 10 10 10 30 <br /> OMS % 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 0-50 050 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 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10 pg/L 10,ug/L 10 kg/L 30 pg/L <br /> LCS Result 10 10 11 31 <br /> LCS % Recov 100 100 110 109 <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 /> !EQU IA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 fail 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 9602707 TTT <6> <br /> i <br /> I <br />