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4D Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N W�get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 8t9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921-0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187, 280045 85 N z <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803523 -01, 03-05 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO31098BTEX03A GCO31098BTEX03A GCO31098BTEX03A GC031098BTEX03A GCO31098ETEX03A <br /> Analy Method EPA 6020 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 # 980218901 980218901 980218901 980218901 980218901 <br /> Sample Conc ND N D ND N D N D <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 # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10 pg/L 10 fig/L 10 pg/L 30 fug/L 60 fig/L <br /> Result 9 4 93 9 4 28 61 <br /> IF % Recovery 94 93 94 93 102 <br /> Dup Result 92 9 0 91 28 60 <br /> MSD % Recov 92 90 91 93 100 <br /> RPD 22 33 32 00 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0.25 <br /> LCS # 81-1<031098 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 # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10pg/L 10 fig/L 10 fig/L 30 fig/L 60pg/L <br /> LCS Result 94 92 94 28 62 <br /> LCS % Recov 94 92 94 93 103 <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 /> 61 WOI 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 /> Gregory <br /> Project Manager *"MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803523 GET <1> <br />