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Sequoia 680 Chesapeake Drive Redwood Gay CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 40 Analytical 819 Straker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> E A Engin eering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9703032 01, 02 deported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO30697BTEX01A GC030697BTEX0IA GCO30697STEXOIA GC030697BTEX01A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Geckler/Porter Geckler/Porter Geckler/Porter Geckler/Porter <br /> MS/MSD # 9702C5804 9702C5804 9702C5804 9702C5804 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Instrument 1 D # GCHP1 GCHP1 GCHP1 GCHP1 <br />' Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 11 11 10 30 <br /> MS % Recovery 110 110 100 100 <br /> Dup Result 1f 11 10 31 <br /> MSD % Recov 110 110 100 103 <br /> rRPD 00 00 00 33 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK030697A BLK030697A BLK030697A BLK030697A <br />' Prepared Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Analyzed Date 3/6/97 3/6/97 3/6/97 3/6/97 <br /> Instrument 1 D # GCHP1 GCHP1 GCHP1 GCHPf <br />' Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Result 10 93 90 26 <br />' LCS % Recov 100 93 90 87 <br /> 60-140 60-140 60-140 60-140 <br />' LCS 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 /> SE9QU0 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 H <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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative % Difference 9703032 EEE <1> <br />