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Sequoia 690 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> frill>r Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 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 9-1848/ 980810-T3 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9808758 -01-04 Reported Aug 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch## GC081798802004A GCO81798802004A GCO81798802004A GC081798802004A GCO81798802004A <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 SL SL SL SL SL <br /> MS/MSD # 98060306 98080306 98080306 98080306 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/17/98 8/17/98 8/17/98 8/17/98 <br /> Analyzed Date 8/17/98 8/17/98 8/17/98 8/17/98 <br /> Instrument I D # GC4 GC4 GC4 GC4 <br /> Conc Spiked 20ug/1- 20ug/L 20ug/L 60ug/L <br /> Result 19 23 22 67 <br /> MS % Recovery 96 116 111 112 <br /> Dup Result 19 25 22 68 <br /> MSD % Recov 93 125 110 114 <br /> RPD 00 83 00 15 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # LCS081798 LCS081798 LCS081798 LCS081798 LCS081798 <br /> Prepared Date 8/17/98 8/17/98 8/17/98 8/17/98 8/17/98 <br /> Analyzed Date 8/17/98 8/17/98 8/17/98 8/17/98 8/17/98 <br /> Instrument I D # GC4 GC4 GC4 GC4 GC4 <br /> Conc Spiked 20ug/L 20ug/L 20ug/1- 60ug/L 500yg/1. <br /> LCS Result 17 18 19 55 481 <br /> LCS % Recov 85 88 95 91 96 <br /> 60-140 60-140 60 140 60 140 <br /> LCS 70-130 70-130 70130 70130 60140 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents <br /> Vlap 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 It <br /> the recovery of anaiytes 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 /> rYager **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative% Difference 9808758 8 L <1> <br />