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' Sequoia 680 Chesapeake Dnvc 'Redwood City CA 94063 t415r 364 9600 Fky(415) 364 9233 <br /> t9C0 gates avenue 5"e! CoRtard CA 945_0 (5101 636 9aC0 FAX(510) 030 9039 <br /> Analytical 319 S(nKer Avenue Sue 3 Sacramento CA 95334 (916) 921 %00 F-kX(916) 92l 0100 <br />' EA Engineering Science &'tech Client Project ID 83739421307, Exxon 7-3942 <br /> 3468 Mt Diablo Blvd Ste B100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention M Cravtnk Work Order# 9502C36-04,07,08,10 12,15 Reported Feb 28, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xyienes <br />' Benzene <br /> CC Batch# GCO22395BTEX06A GCO22395BTEX06A GCO22395BTEX06A GCO22395STEXD6A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst G Garda G Garcia G Garcia G Garcia <br /> MS/MSD # 950288403 950268403 950288403 9502B8403 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 2/23/95 2/23/95 2/23/95 2/23/95 <br /> Analyzed Date 2/23/95 2/23/95 2/23/95 2/23/95 <br />' Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conic Spiked 10ug/L 10lrg/L 10}9/L 30u9/L <br /> Result 11 11 11 33 <br /> MS % Recovery 110 110 110 110 <br /> Dup Result 99 11 11 34 <br /> MSD % Recov 99 110 110 113 <br />' RPD. 11 00 00 30 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> I <br /> LCS # <br /> Prepared Date - <br /> Analyzed Date - <br />' Instrument 1.13# <br /> Conc. Spiked <br /> LCS Result. - - <br /> LCS% Recov. - - <br /> MS/M 71-133 72-128 72-130 71-120 <br />' LCS <br /> Control Limits <br /> Please Note <br /> The LCS Is a control sample of known,Interferent-free matrix that 1s analyzed using the same reagents, <br /> :tin <br /> YTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortif=ied 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 />' Project Manager MS=Matrix Spike MSD=MS Duplicate,RPD=Relative%Difference 9502036 EEE <3> <br />