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J <br /> 16 <br /> LAB CORE LABORATORIES <br /> Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 991747 Report Date . 09/08/1999 <br /> CUSTOMER: IT Group PROJECT, Southland - Martinez ATTN: Bob Butler <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> Test Method EPA 8021E Batch 8337 Analyst.. evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 09/D3/1999 1#39 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br /> enzene 0 00 <br /> thylbenzene 0 00 <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 00 <br /> 1,ylenes (total) 0 00 <br /> LC5 Laboratory Control Sample 09072801 09/03/1999 1256 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br /> Benzene 47 60 50 95 2 _ 39-150 <br /> benzene 52 09 50 104 2 32-10 <br /> 1-t-butyl Ether (MTBE) 251 54 250 100.6 50-1550 <br /> ene 50 06 50 100 1 46-148 <br /> Xylenes (total) 155 14 150 103 4 75-125 <br /> LCD Laboratory Control Sample Duplicate 09072801 09103/1:9991=1322 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br /> enzene 47 82 47 60 50 95 6 39-150 <br /> 0 5 20 <br /> Ethylbenzene 50 01 52 09 50 100.0 32-160 <br /> 4 1 20 <br /> ethyL-t-Butyl Ether (MTBE) 248 78 251 59 250 99 5 50-150 <br /> 1 1 25 <br /> oluene 51 18 50 06 50 102 4 46-148 <br /> 2 2 20 <br /> yLenes (total) 156 22 155 14 150 104 1 75-125 <br /> 0 7 20 <br /> MS Matrix Spike 09072801 991748-2 T 09104/1999 0239 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br /> Benzene 47 00 50 0 00 94 0 39-150 <br /> thytbenzene 48 96 50 0 64 96 6 32-160 <br /> ethyl-t-Butyl Ether (MTBE) 253 66 250 0 00 101 5 50-150 <br /> oluene 49 80 50 0 00 99 6 46-148 <br /> Xylenes (total) 153 67 150 4.11 99 7 75-125 <br /> Page 8 <br /> * %=% REC, R=RPD, A=ABS Diff., D=% Diff <br /> Tne s^ahn.el re,Wl,opnrn,s«merpatat.n,conwryd m thea report ora Dosed upon mipmut.n end mxtmel wpWiad by tw CLeM for.nose sxcluuva entl wnndertt�uae flus repo,nos been meW The ensyl.al re,Wis opnbns«rtlarpera trona <br /> exorees,d reoree,nt me wet ludpmeel al Coe Laboret«le,Care I.alwramrtes nn»auw malws no warcanry or repreeentauon axWr «mp—of any type and axprasaly a scta,ma same as tp the pod WIY proper operel ode w prafiteUerwan at <br /> any os eaa o.ai a etltar-neral prppeny wM or sand m connect.,wrath which ouch report Is used«rWxM upon ldr arty rraon veulaoewe Tru,raven a.0 not w rapre.W�n wrote or n cert whheuf the ver Ilan,pp 1 of Cwe tabora.— <br />