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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 /> �rill>� Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> < Gettler Ryan/Geostrategies Client Project}ID Unocal 782721,#0187 h <br /> }'6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> {Attention Steve Carter Work Order ii 97081=35 -01 Reported Sep 4, 1997,- <br /> •te <br /> } 4 r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO82997BTEX02A GCO82997BTEX02A GCO82997BTEX02A GCO82997BTEX02A GCO82997BTEX02A <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 9708C7105 9708C7105 9708C7105 9708137105 <br /> Sample Conc N D ND 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 # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10ug/L 10ug/L 101ig/L 30ug/L 60Vg/L <br /> Result- 10 99 10 31 68 <br /> MS % Recovery 100 99 100 103 113 <br /> 0 Dup. Result 98 95 97 30 64 <br /> MSD % Recov 98 95 97 100 107 <br /> RPD 20 41 30 33 61 <br /> RFD Limit 0-25 0-25 0-25 0-25 0-25 <br /> S t 1^v• s n v r <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 #' GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10ug/L 10ug/L 10yg/L 30ug/L 60ug/L <br /> LCS Result 10 10 10 31 67 <br /> LCS % Recov 100 100 100 103 112 <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 /> A&QUOIA 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 /> regory <br /> Project Manager ""MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9708E35 GET <1> <br />