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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)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-%00 FAX(916) 921 0100 <br /> Gettler Ryan/Geostrategles Client Project ID Former Unocal 2859, 280054 85 v f M1 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803390-03 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031098BTD(02A GCO31098BTEX02A GCO31098BTEX02A GCO31098STEX02A GC0310986TIX02A <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. C DeMartini C DeMartini C DeMartini C DeMartini C DeMartini <br /> MS/MSD # 980212102 980212102 980212102 980212102 980212102 <br /> Sample Conc NO N D NO NO ND <br /> Prepared Date* 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Analyzed Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10)ag/L 10 pg/L 10 yg/L 30 Mg/L 60 Ng/L <br /> Result 9 1 8 7 88 26 66 <br /> MS % Recovery 91 87 88 87 110 <br /> 0 Dup Result 8 9 8 5 85 26 64 <br /> MSD % Recov 89 85 85 87 107 <br /> RPD 22 23 35 00 31 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> YV 1 <br /> LCS # BLK031098 BLK031098 BLK031098 BLK031098 BLK031098 <br /> Prepared Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> Analyzed Date 3/10/98 3/10/98 3/10/98 3/10/98 3/10/98 <br /> instrument I D #' GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked 10jtg/L 10)tg/L 10Ng/L 30ug/L 60ug/L <br /> LCS Result 90 87 87 26 66 <br /> LCS % Recov 90 87 87 87 110 <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 /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> VAW§&QU0ALYTICAL 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 /> ger "*MS Matrix Spike,MSD MS Duplicate,RPD Relative%Difference 9803390 GET a2> <br />