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Sequoia660 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 9600 FAX (916) 921 0100 <br /> GettlerrRyan/Geostrategles Client Project ID Unocal 7827 21, #0187 <br /> °6747 Sierra Court, Ste J Matrix Liquid <br /> '{Dublin, CA 94568 { <br /> ,,Attention Steve Carter Work Order# 970SE35-02 Reported Sep 4, 1997 <br /> a.,.} w <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC082997BTEX17A GC082997BTEX17A GCO82997BTEX17A GCO82997BTEX17A GCO829973TEX17A <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 A Miraftab A Miraftab A Miraftab A Miraftab A Miraftab <br /> MS/MSD # 9708C7105 970SC7105 970SC7105 970807105 970807105 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date: 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D.# GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 1opg/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 86 88 87 26 59 <br /> M % Recovery 86 88 87 87 98 <br /> 0 Dup. Result 84 84 85 25 57 <br /> MSD % Recov 84 84 85 83 95 <br /> RPD 24 47 23 39 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> � ~ 4ti ♦ • t v r s <br /> LCS # BLK082997 BLK082997 BLK082997 BLK082997 BLK082997 <br /> Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked 10ug/L 10ug/L 10pg/L 30ug/L 60Ng/L <br /> LCS Result 83 83 85 25 57 <br /> LCS % Recov. 83 83 85 83 95 <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-tree matrix that is analyzed using the same reagents, <br /> NALY ]CAL 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 /> ory <br /> 1rooject Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9708E35 GET <2> <br /> �cy <br />