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Sequoia 680 Chesapeake Dnve Redwood City CA 9!063 (413) 3o4 9000 FkX(415) 364 9233 <br /> 1 404 ti \Vgcc Lane VPalnut Creek C-� 94593 (i 10) 983 9a00 FAX(3i0) 983 91673 <br /> X111 Analytical 319 Smktr avenue Suitt 3 Sacramento CA 93334 (916) 921 9000 FAiC(916)911 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942/8373942 1307 <br /> 9 9 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Tracy Faulkner Work Order; 951OF27 -01-07 Reported Oct 30, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC102495BTEX20A GC102495BTEX20A GC1024956TEX20A GC102495STEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst B Sullivan B Sullivan B Sullivan B Sullivan <br /> MS/MSD # 951OA0605 951OA0605 9510AC605 951OA06CS <br /> Sample Conc N D N D N D N D <br /> Prepared Date 10/24/95 10/24/95 10/24/95 10/24/95 <br /> Analyzed Date 10/24/95 10/24/95 10/24/95 10/24/95 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked loyg/L long/L 10Ng/L 30ug/L <br /> Result 94 94 93 28 <br /> MS % Recovery 94 94 93 93 <br /> Dup Result 10 10 10 30 <br /> MSD % Recov 1110 100 100 100 <br />' RPD 91 82 82 76 <br /> RPD Lima. 0-50 0-50 0-50 0-50 <br /> LCS # - <br />' Prepared Date <br /> Analyzed Date <br />' Instrument I D # <br /> Conc Spiked <br /> LCS Result- ' <br /> LCS % Recov - - <br /> MS/MSD <br /> LCS 71-133 72-128 72130 71-120 <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 /> regPenner <br /> ALYTICAL 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 1s to be used to validate the batch <br /> ' Project Manager "MS=Matnx Spike, MSD=MS Duplicate RPD=Relative %Difference 951OF27 EEE -41> <br />