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` ,K) Sequoia 0680 Chesapeake Dave Redwood City,CA 9406415) 364 9600 rAX(415) 364 9233 <br /> 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 /> i <br /> aA <br /> �,Gettler Ryan/Geostrategles Client Project ID Unocal 4707 Pacific Ave <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> x`Dublin, CA 94568 <br /> IAttention Greg Gurss Work Order# 9605104 -02 Reported Jun 3, 1 996{? <br /> �4 Hlrta itv Vt w ♦ • +n.v} tr r rr •♦ <br /> r} ,. • }n ♦r r r.{ n r r v ♦ v vn v r �}'r r v v <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC053096BTEX17A GCO53096BTEX17A GC053096BTEX17A GC053096BTEX17A <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 # G9605D77-14B G9605D77-14B G9605D77-14B G960SD77-14B <br /> Sample Cone N D N D N D N D <br /> Prepared Date 5/30/96 5/30/96 5/30/96 5/30/96 <br /> Analyzed Date 5/30/96 5/30/96 5/30/96 5/30/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 10 10 10 30 <br /> J*MS %Recovery 100 100 100 100 <br /> Dup Result: 92 92 91 27 <br /> MSD % Recov 92 92 91 90 <br /> RPD 83 83 94 11 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# GBLK053096A GBLK053096A GBLK053096A GBLK053096A <br /> Prepared Date 5/30/96 5/30/96 5/30/96 5/30/96 <br /> Analyzed Date 5/30/96 5/30/96 5/30/96 5/30/96 <br /> Instrument I D #: GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked 10 ug/L 10 ug/L i0 ug/L 30 ug/L <br /> LCS Result: 97 98 97 29 <br /> LCS %Recov 97 98 97 97 <br /> 50-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> �EQUOIA A ALYTiCAL 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 /> Mike regory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9605104 GET <2> <br />