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Sequoia680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> lto Analytical 819 Stnker Avenue Suite B Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> IE A Englneenng Science &Tech Client Project ID Exxon 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br />' Attention Christa Marting Work Order# 9708E45 -01, 06, 17 Reported Sep 11, 1997 <br /> IQUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO83097STEX06A GCO8309713TEX06A GC083097BTEX06A GCO83097STEX06A GCO83097STEX06A <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 J Heider J Heider J Heider J Helder J Herder <br /> MS/MSD# 9708E4508 9708E4508 9708E4508 9708E4508 9708E4508 <br /> Sample Conc ' ND ND ND N D N 0 <br /> Prepared Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Analyzed Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Instrument 1 D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 10ug/L 10ug/L lOpg/L 30pg/L 60jtg/L <br /> Result 74 77 75 22 51 <br /> MS % Recovery 74 77 75 73 85 <br /> Dup Result 78 81 80 23 54 <br /> MSD % Recov 78 81 8o 77 90 <br /> RPD 53 51 65 44 57 <br /> RPD Limit 0-25 0-25 0.25 0-25 0-25 <br /> LCS# BLK083097 BLK083097 BLK083097 BLK083097 BLK083097 <br /> Prepared Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Analyzed Date 8/30/97 8/30/97 8/30/97 8/30/97 8/30/97 <br /> Instrument LD # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 10pg/L 10yg/L 10,ug/L 30pg/L 60Ng/L <br /> LCS Result 7 6 79 79 23 52 <br /> LCS % Recov 76 79 79 77 87 <br /> 60-140 60-140 60-140 60-140 80-140 <br /> LCS 70-130 70-130 70.130 70-130 70-130 <br /> Control Limits <br /> Please!Vote <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 /> c and Herling <br /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 970BE45 EEE <1> <br />