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t Sequoia 680 Ch.peake Drive Redwood City CA 94063 (415) 364 %00 FAX(4t5) 364 9233 <br /> r'Y^ ✓ l 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 t0)988 %73 <br /> Analytical 819 Sinker Avcrwe Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0l00 <br /> 6 Aor <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942 / 51539421307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Marla Guensler Work Order# 9604E22 06-09 Reported May 13, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC042496BTEX02A GC0424968TEXM2A GCO424968TEX02A GC04249613TEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J woo J woo J Woo <br /> MS/MSD# 960485903 960485903 960485903 960485903 <br />' Sample Conc N 0 N D N D N D <br /> Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date* 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Instrument LD # GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10 ftg/L 10,ug/L 10,ug/L 30 pg/L <br /> Result 10 10 10 31 <br /> MS % Recovery. 100 100 100 103 <br /> pup Result 11 11 11 31 <br /> MSD % Recov. 110 110 110 103 <br /> RPD 95 95 95 00 <br /> RPE) Limit. 0.25 0-25 0-25 0-25 <br /> LCS# BLK042496 BLK042496 BLK042496 BLK042496 <br />' Prepared Date 4/24/96 - 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Instrument I D #- GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10 rfg/L 10ug/L 10lrg/L 30 frg/L <br /> LCS Result 75 75 81 22 <br />' LCS % Recov.: 75 75 81 73 <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 /> r7=FG)2'linterference <br /> 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 /> the LCS recovery is to be used to validate the batch <br /> Kevin Follett <br />' Project Manager **MS=Matrix Spike, MSD-MS Duplicate, RPO-Relative% Difference 9604E22 EEE <1> <br />