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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D— <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) 92.1 9600 FAX(916)921 0100 <br /> IftArGettler Ryan/G eostrateg 1 es Client Project ID Tosco 6981, 140124 02 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Steve Carter Work Order# 9802153 -01 Reported Mar 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22898BTEX03A GCO22898BTEX03A GCO22898BTEX03A GCO22898BTEX03A GCO22898BTEX03A <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 5430 <br /> Analyst C Demartini C Demartini C Demartini C Demartini C Demartini <br /> MS/MSD # 9802D6006 9802D6006 9802D6006 9802D6006 9802D6006 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Analyzed Date 2/28/98 2/26/98 2/28/98 2/28/98 2/28/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 96 95 96 29 63 <br /> 46 S % Recovery 96 95 96 97 105 <br /> DUP Result 98 96 98 30 64 <br /> MSD % Recov 98 96 98 100 107 <br /> RPD 21 10 21 34 16 <br /> RPD Limit 025 0-25 0'25 0-25 0-25 <br /> LCS # BLK022898 BLK022898 BLK022898 BLK022898 BLK022898 <br /> Prepared Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Analyzed Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 93 9 2 94 28 61 <br /> LCS % Recov 93 92 94 93 102 <br /> 60-140 60-140 60140 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 /> QU OIA YTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Kegory 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 /> /Mi <br /> Project Manager **MS=Matrix Spike,MSD=NIS Duplicate, RPD=Relative%Difference 9802153 GET a 1> <br />