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680 Chesapeake Drive Redwood Cecy CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Crcck 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 />' E-A Engineering Science &Tech Client Project 1D Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9707B97 01, 02,04,05, 07, 09 Reported Aug 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC072897BTEX03A GC072897BTEX03A GC072897BTEX03A GC072897BTEX03A GC072897BTEX03A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa D Jima D Jirsa D Jirsa <br /> MS/MSD# 9707B5201 970785201 970785201 970785201 970785201 <br />' Sample Cone N D N D N D N D N D <br /> Prepared Date 7/28/97 7/28/97 7/28/97 7/28/97 7/28/97 <br /> Analyzed Date 7/28/97 7/28/97 7/28/97 7/28/97 7/28/97 <br /> Instrument I D# GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br />' Cone Spiked 10pg/L 10pg/L 10yg/L 30ug/L 60pg/L <br /> Result 89 89 90 25 72 <br /> MS%Recovery 89 89 90 83 120 <br /> Dup Result 87 87 88 25 71 <br /> MSD% Recov 87 87 88 83 118 <br /> RPD 23 23 22 00 14 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK072897 BLK072897 BLK072897 BLK072897 BLK072897 <br /> Prepared Date 7/28/97 7/28/97 7/28/97 7/28/97 7/28/97 <br /> Analyzed Date 7/28/97 7/28/97 7/28/97 7/28/97 7/28/97 <br /> Instrument I.D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10pg/L 10ug/L 10Ng/L 30ug/L 60lig/L <br /> LCS. Result 83 82 83 22 67 <br /> LCS % Recov 83 82 83 73 112 <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 /> SEQUOIA 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 /> evtn Follett <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9707B97 EEE <1> <br />