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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 IV Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> (-D-„ Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste G Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Argy Leyton Work Order# 95051-04 -01-03, 07 Reported ,dun 7, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO60595BTEX17A GC060595BTEX17A GCO60595BTEX17A GCO60595BTEX17A <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 Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 950519002 950519002 950519002 950519002 <br /> Sample Cone N D ND ND N D <br /> Prepared Date 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Analyzed Date 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10pg/L 10Ng/L 10yg/L 30pg/L <br /> Result 10 10 10 30 <br /> MS % Recovery loo 100 100 100 <br /> Dup Result. 98 98 98 29 <br /> MSD % Recov 98 98 98 97 <br /> RPD 20 20 20 34 <br /> RPD Limit. 0-50 0-50 0.50 0-50 <br /> i,++ + + y , ry r + v r + r r r n.w r 4 } r n r 4 r • {rt,+ <br /> xv + +r 4 • v vv r + vti v r +r niv.v vv Yrr v$r +n rr n ♦rtvv + ++ v vv vry v4+t+r { + r+v •n w i +++ xrm + <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Cone Spiked <br /> LCS Result <br /> LCS % Recov <br /> MS/MSD <br /> LCS 71-133 72-128 72-130 71-120 <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 ANALYTICAL 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 Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 95051-04 GET <1> <br />