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- ' Sequoia 680 Chesapeake Dnve Redwood Ciry CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404H Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lalayette, CA 94549 <br />' Attention Christa Marting Work Order# 9803305 09 Reported Apr 3, 1998 <br /> 9803306 10-14, 16-18 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031698BTEX2IA GC031698BTEX2IA GC031698BTEX2IA GC031698STEX21A GC031698BTEX21A <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 C DeMartini C DeMartini C DeMartini C DeMartini C DeMartini <br /> MS/MSD# 980352914 980352914 980352914 980352914 980352914 <br /> Sample Cone NO N D N D NO N D <br /> Prepared Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Analyzed Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10ug/L 10}eg/L 10pg/1- 30ug/L 60u9/1- <br /> Result 10 98 97 28 46 <br /> MS % Recovery 100 98 97 93 80 <br /> Dup Result 10 99 10 30 50 <br /> MSD % Recov 100 99 100 100 83 <br /> RPD 00 10 30 69 41 <br /> RPD Limit 0-25 0-25 0-25 025 0-25 <br /> LCS # BLK031698 BLK031698 BLK031698 BLK031698 BLK031698 <br /> Prepared Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Analyzed Date 3/16/98 3/16/98 3/16/98 3/16/98 3/16/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spilled 10,ug/L 10Ng/L 10pg/L 30kg/L 60yg/L <br /> LCS Result 97 94 99 28 48 <br /> LCS % Recov 97 94 99 93 80 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70130 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 /> Richard Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference 9803305 EEE <4> <br />