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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W3get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 1a) <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-2033 / 980209-A2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9802713-04 Reported Mar 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A GCO22398802004A <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# 98020513 98020513 98020513 98020513 - <br /> Sample Conc . N D N D N D N D - <br /> Prepared Date 2/21/98 2/21/98 2/21/98 2/21/98 - <br /> Analyzed Date 2/21/98 2/21/98 2/21/98 2/21/98 - <br /> Instrument I D # GC4 GC4 GC4 GC4 - <br /> Conc Spiked 20 pg/L 20 pg/L 20 Ng/L 60 Ng/L - <br /> Result 185 192 202 605 - <br /> MS % Recovery 93 96 101 101 - <br /> Dup Result 201 209 222 665 - <br /> MSD % Recov 101 105 111 ill - <br /> RPD 83 85 94 94 - <br /> RPD Limit 0-25 0-25 0-25 0-25 - <br /> LCS# LCS022398 LCS022398 LCS022398 LCS022398 LCS022398 <br /> Prepares! Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Analyzed Date 2/23/98 2/23/98 2/23/98 2/23/98 2/23/98 <br /> Instrument I D #: GC4 GC4 GC4 GC4 GC4 <br /> Conc Spiked 20pg/L 20ug/L 20,ug/L 60 fig/L 500 fig/L <br /> LCS Result. 186 194 205 62 450 <br /> LCS %Recov 93 97 103 103 90 <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 /> lap#2'142 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sarrlpie <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 /> Pe y Penner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9802713 BLA <4> <br />