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(D 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 /> IQF Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> is <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 21 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Anaiyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21496BTEX17A GCO21496BTEX17A GCO214966TEX17A GCO21496BTEX17A <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# 960207712 960207712 960207712 960207712 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10 fig/L 10 fug/L 10Pg/L 30 fug/L <br /> Result 11 11 11 33 <br /> S % Recovery 110 110 110 110 <br /> Dup Result 12 12 12 36 <br /> MSD % Recov 120 120 120 120 <br /> RPD- 87 87 87 87 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK021496 BLK021496 BLK021496 BLK021496 <br /> Prepared Date. 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Colic Spiked 10 fug/L 10 fig/L 10 fug/L 30 fug/L <br /> LCS Result 12 11 11 34 <br /> LCS % Recov 120 110 110 113 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limrts <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> OEQUOIA 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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9602708 TTT <5> <br />