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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> (Z� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> S <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8632 /980212-C1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9802902-01-06 Reported Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22598802007A GCO22598802007A GCO22598802007A GCO22598802007A GCO22598802007A <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 # 98020609 98020609 98020609 98020609 <br /> Sample Conc 1 0 N D N D N D <br /> Prepared Date 2/24/98 2/24/98 2/24/98 2/24/98 <br /> Analyzed Date 2/24/98 2/24/98 2/24/98 2/24/98 <br /> Instrument 1 D # GC7 GC7 GC7 GC7 <br /> Conc Spiked 20Pg/L 20ug/L 20ug/L 60ug/L <br /> Result 16 149 155 47 3 <br /> MS % Recovery 75 75 78 79 <br /> Dup Result 166 157 16 6 501 <br /> MSD % Recov 78 79 83 84 <br /> RPD 37 52 69 57 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# LCS022598 LC3022598 LCS022598 LCS022598 LCS022598 <br /> Prepared Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Analyzed Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Instrument I D # GC7 GC7 GC7 GC7 GC7 <br /> Conc Spiked 20 erg/L 20 ug/L 20 ug/L 60 ug/L 500ug/L <br /> LCS Result 154 155 165 497 494 <br /> LCS % Recov 77 78 83 83 99 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <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 />�Elap#2142 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 /> P <br /> nub interference,the LCS recovery is to be used to validate the batch <br /> Peggy enner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPO=Relative% Difference 9802902 SLA <2a <br />