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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94593 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9660 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 /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9803307 21 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO31598BTEX21A GC031598BTEX21A GC031598BTEX21A GC031598STEX2IA GC031598STEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA Sol 5M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C DeMartini C DeMartini C DeMartini C DeMartrni C DeMartint <br /> MS/MSD# 980331804 980331804 980331804 980331804 980331804 <br /> Sample Conc N D N D N D N D N D <br />' Prepared Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Analyzed Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Instrument ID # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10 fig/L 10,ug/L 10 yg/L 30 Ng/L 60 pg/L <br /> Result 10 10 10 31 55 <br /> MS %Recovery 100 100 100 103 92 <br /> Dup Result 10 10 10 31 56 <br /> MSD % Recov 100 100 100 103 93 <br />' RPD 00 00 00 00 18 <br /> RPD Limit 0 25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031598 BLK031598 BLK031598 BLK031598 SL K031598 <br /> Prepared Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Analyzed Date 3/15/98 3/15/98 3/15/98 3/15/98 3/15/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10ug/L 10Ng/L 10Ng/L 30lig/L 60yg/L <br /> LCS Result 10 10 10 31 51 <br /> LCS % Recov 100 100 100 13 85 <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 analyses 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 HerliAg <br /> Project Manager MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9803305 EEE <8> <br />