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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> Ci) 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> qW Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707) 792 0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-2033/ 980811-P 1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9808956 -01-03 Reported Sep 1, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO81998802004A GC081998802004A GCO81998802004A GC081998802004A GCO81998802004A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst S L S L S L SL S L <br /> MS/MSD # 98080405 98080405 98080405 98080405 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/19/98 8/19/98 8/19/98 8/19/98 <br /> Analyzed Date 8/19/98 8/19/98 8/19/98 8/19/98 <br /> Instrument I D # GC4 GC4 GC4 GC4 <br /> Conc Spiked 20 ug/L 20ug/L 20 ug/L 60 ug/L <br /> Result 17 18 19 56 <br /> MS % Recovery 86 91 97 93 <br /> Dup Result 19 19 19 56 <br /> MSD % Recov 96 96 96 94 <br /> RPD 111 54 00 00 <br /> RPD Limit 0-25 0-25 0-25 025 <br /> LCS # LCS081998 LCS081998 LCS081998 LCS081998 LCS081998 <br /> Prepared Date 8/19/98 8/19/98 8/19/98 8/19/98 8/19/98 <br /> Analyzed Date 8/19/98 8/19/98 8/19/98 8/19/98 8/19/98 <br /> Instrument I D # GC4 GC4 GC4 GC4 GC4 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60pg/L 500 ug/L <br /> LCS Result 16 17 18 52 431 <br /> LCS % Recov 82 85 91 87 86 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known interferent4ree matrix that is analyzed using the same reagents <br /> Wp#2 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 analyticai procedure d <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 /> er **MS=Matrix Spike, MSD=MS Duplicate, RPD=Reiative% Difference 9808956 BW <1> <br /> r-1-11 <br />