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' Sequoia 680 Chesapcak: Dnvc RedwQod Czry CA 94003 e415) 304 9000 ^A.Y(4151 304 9233 <br /> �Y^ 1900 Races Avenue Suis:L Concord Com, 94520 %510) 630 9000 10' 636 9639 <br /> 6 Analytical 319 SczRer Avenue Suice 3 Sacramento CA 95334 (9t6) 921 9600 FAX(9 10) 921 0100 <br />' EA Engineering Science &Tech Client Project ID 83739421307, E>ocon 7-3942 <br /> 3468 Mt Diablo Blvd Ste B100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention M Cravink Work Order# 9502036 01-02,05-06,09,11, Reported Feb 28, 1995 <br />' 13.1a,1s <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO22295BTEXo1 B GCO22295BTEX01 B GCO22295BTEX018 GCO222958TEX01 B <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst G Garcia G Garcia G Garcia G Garcia <br /> MS/MSD # 950298402 9502B8402 9502BB402 950288402 <br />' Sample Conc NO NO NO N 0 <br /> Prepared Date 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Analyzer Date- 2/22/95 2/22/95 2/22/95 2/22/95 <br />' Instrument I D # GCHPt GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 10Kg/L 10pg/L topg/L 301rg/L <br /> Result 93 91 91 27 <br /> MS % Recovery 93 91 91 90 <br /> Dup Result 10 10 99 29 <br /> MSD % Recov 100 100 99 97 <br />' RPD 73 94 84 71 <br /> RPD L1mft 0-50 0.50 0-50 0-50 <br /> LCS # <br />' Prepared Date - - <br /> Analyzed Date - - <br />' Instrument LD #. <br /> Conc. Spiked: <br /> LCS Result - - <br />' LCS %Recov - - - - <br /> MS/MSD 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 Is analyzed using the same reagents <br /> Pan <br /> I NALYTICAL 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 front the matrix spike does not fail within specifted control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Chin <br />' Project Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9502C36 EEE ¢1> <br />