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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 IAX (415) 364 9233 <br /> KD— 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue,Swtc a Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project Ib' Unocal 6981, Stockton v s <br /> 6747 Sierra Court, Ste J Matrix Air <br /> Dublin, CA 94568 <br /> Attention Steve Carter Work Order 7# 9704D69 01, 02 Reported Apr 30, 1997, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC042597BTEX03A GC042597BTEX03A GC042597BTEX03A GCO42597BTEX03A GC042597BTEX03A <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 D Jirsa D Jirsa D Jirsa D Jirsa D Jtrsa <br /> MS/MSD # 970469402 970469402 970489402 970489402 970489402 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 4/25/97 4/25/97 4/25/97 4/25/97 4/25/97 <br /> Analyzed Date 4/25/97 4/25/97 4/25/97 4/25/97 4/25/97 <br /> Instrument I D #: GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc. Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 65 65 68 19 39 <br /> MS % Recovery 65 65 68 63 65 <br /> 0 Dup Result 11 11 11 32 66 <br /> MSD % Recov 110 110 110 107 110 <br /> RPD 51 51 47 51 51 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK042597A BLK042597A BLK042597A BLK042597A BLK042597A <br /> Prepared Date 4/25/97 4/25/97 4/25/97 4/25/97 4/25/97 <br /> Analyzed Date 4/25/97 4/25/97 4/25/97 4/25/97 4/25/97 <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 11 11 11 33 66 <br /> LCS % Recov 110 110 110 110 110 <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 /> ,&QUOTA PAALYTICAL 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 /> lkinterference,the LCS recovery is to be used to validate the batch <br /> e Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9704D70 GET -41> <br />