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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 /> X117 Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187, 280045 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803523-06 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> CC Batch#- GC031098BTEX17A GCO31098STEX17A GCO31098BTEX17A GC031098BTEX17A GC031098BTEX17A <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 # 980318901 980318901 980318901 980318901 980318901 <br /> Sample Conc N D N D N D N D NO <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.# GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10Ng/L 30pg/L 60Ng/L <br /> Result 10 96 93 29 56 <br /> S % Recovery 100 96 93 97 93 <br /> Dup Result 95 91 84 28 63 <br /> MSD % Recov 95 91 84 93 105 <br /> RPD 51 53 10 35 12 <br /> RPO Limit 0-25 0-25 0-25 0-25 0-25 <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 # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> LCS Result 99 93 89 28 53 <br /> LCS % Recov 99 93 89 93 88 <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 /> AFhF'QUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure K <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 /> regory <br /> oject Manager MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803523 GET <3> <br />