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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 404 N %get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95934 (916) 921 9600 FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9801803 03 Reported Feb 4, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCO12698BTEX06A GC01269813TEX06A GCO12698BTEX06A GC012598BTEX06A GC012698BTEX06A <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 Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 980164201 980164201 980164201 980164201 980164201 <br />' Sample Cone N N D N D N D N D <br /> Prepared Date 1/26/98 1/26/98 1/26/98 1/26/98 1/26/98 <br /> Analyzed Date 1/26/98 1/26/98 1/26/98 1/26/98 1/26/98 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br />' Cone Spiked loyg/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 87 86 8 8 27 50 <br /> MS % Recovery 87 86 88 90 83 <br /> Dup Result 10 10 10 30 58 <br /> MSD % Recov 100 100 100 100 97 <br />' RPD 14 15 13 11 t5 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK012698 BLK012698 BLK012698 BLK012698 BLK012698 <br />' Prepared Date 1/23/98 1/23/98 1/23/98 1/23/98 1/23/98 <br /> Analyzed Date 1/23/98 1/23/98 1/23/98 1/23/98 1/23/98 <br /> Instrument 1 D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br />' Cone Spiked 10ug/L 10ug/L 10pg/L 30pg/L 60ug/L <br /> LCS Result 10 10 11 31 59 <br /> LCS °/4 Recov 100 100 110 103 98 <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 ANALYT CAL 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 matrixinterference,the LCS recovery is to be used to validate the batch <br /> RI hard Herlin <br />' Project Manage **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9801803 EEE <3> <br />