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, <br /> L 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 991748 Report Date. 09/09/1999 <br /> CUSTOMER. 3T Group PROJECT. Southland - Martinez ATTN; Bob Butler <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> LCS Laboratory Control Sample f*072801 09/07/1999 1215 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F <br /> enzene 49 82 50 99 6 39-150 <br /> Ethylbenzene 52 39 50 104 8 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 281 39 250 112 6 50-150 <br /> oluene 53 57 50 107 1 46-148 <br /> ylenes (total) 166 97 150 111 3 75-125 <br /> LCD Laboratory Contra( Sample Duplicate 090712841 09/07/1999 IZ41 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc. Result * Limits F <br /> Benzene 49 57 49 62 50 99.1 39-150 <br /> 0.5 20 <br /> 1thyLbenzene 52 34 52 39 50 104 7 32-160 <br /> 0 1 20 <br /> Methyl-t-Butyl Ether (MTBE) 261 73 281 39 250 104 7 50-150 <br /> 7 2 25 <br /> 0 ne 53 91 53 57 50 107 8 46-148 <br /> 0 6 20 <br /> Xylenes (total) 166 63 166 97 150 111 1 75-125 <br /> 0 2 20 <br /> MS Matrix Spike 09072001 991758-2 09/08/1999 0152 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 47 66 50 0 00 95 3 _ 39-150 <br /> Ethylbenzene 51 24 50 0 00 102 5 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 261 47 250 0 00 104 6 50-150 <br /> oluene 52 90 50 0 00 105 8 46-148 <br /> ylenes (total) 161 43 150 0 00 107 6 75-125 <br /> MSD M�atrlx <br /> pike Ouplaeote 09072801 991758-2 09/08/1999 0,218 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 49 11 47 66 50 0 00 98 2 39-150 <br /> 3 20 <br /> 1thylbenzene 55 62 51 24 50 0 00 111 2 32-160 <br /> 8 20 <br /> Methyl-t-Butyl Ether (MTBE) 252 94 261 47 250 0.00 101.2 50-150 <br /> 3 25 <br /> oluene 53 50 52 90 50 0 00 107 0 46-148 <br /> 1 20 <br /> Xylenes (total) 175 50 161 43 150 0 00 117 0 75-125 <br /> s 20 <br /> Page 10 <br /> * X=X REC, R=RPD, A=ABS Diff , D=% Diff <br /> Ina enelylical!Hulls ogneN9 d{nlsrpMletlonB 1pnla nab n Ih s report ere besee upon urtorm011on anp melenel 9uppNee M the GNnI}or whose 0 Gh+sti'e antl Oonfitlenhal lw Ih s report has haan matla The Bnety11W mulls Do—Or Inlarprsl0 tgns <br /> aepe95a0 reGaepll the best,A-dgzt of Cnra Laoorata�es'C: Laodala es however malls no war Wy G rapr0s&+IetiOn esdess Or mGaae of any type and lvG ssly oiwFens same as to the pppuOtwny prpper operslws or Pmatgptalyee OI <br /> any oil gas coal or otnq mn 1 property well OF sarM h connection-lh wnKl1 avCn repw is Vsenl or re*ep upon fG all ra— tt—This r.pW!nail not W ralsW-ad In-Wl-O In pert esletnlrt the wnllen appro l Of Care Labw.,.ries <br />