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1 <br /> 1 <br /> COULAB 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 991124 Report Date 06/30/1999 <br /> CUSTOMER IT Group PROJECT* Southland - Martinez ATTN, Shelby Lathrop <br /> OC Type T Description Reag Code Lab ID Dilution Factor Date Time <br /> LCD Laboratory Control Sample Duplicate 09062503 06/29/1999 1855 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F <br /> Ienzene 48 97 46 79 50 97 9 39-150 <br /> thyLbenzene 46 50 44 39 50 93 0 2032-160 <br /> 4 6 20 <br /> ethyl-t-Butyl Ether (MTBE) 324.41 321 23 250 129 8 50-150 <br /> 1 0 25 <br /> oluene 48 20 45 83 50 96 4 46-148 <br /> 5 0 20 <br /> Xylenes (total) 146 14 139 46 150 97 4 75-125 <br /> ' 4 7 20 <br /> MS Matrix Spike09062503 991123-2 06/30/1999 0641 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value CaLc Result * Limits F <br /> enzene 39 76 50 0 00 79 5 _ 39-150 <br /> Ethylbenzene 35 91 50 0 00 71 8 32-160 <br /> 1 ethyl-t-Butyl Ether (MTBE) 289 30 250 0 51 115 5 50-150 <br /> tWgne 38 64 50 0 00 77 3 46-148 <br /> es (total.) 125 05 150 0 00 83 4 75-125 <br /> MSD Matrix Spike Duplicate 09062503 991123-2' 06/30/1999 0707 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 40 20 39 76 50 0 00 80 4 39-150 <br /> 1 20 <br /> Ithylbenzene 31 94 35 91 50 0 00 63 9 32-160 <br /> 12 20 <br /> ethyl-t-Butyl Ether (MTBE) 296 14 289 30 250 0 51 118 3 50-150 <br /> 2 25 <br /> oluene 38 26 38 64 50 0 00 76 5 46-148 <br /> 1 20 <br /> Xylenes (total) 128 18 125 05 150 0 00 85 5 75-125 <br /> 2 20 <br /> Test Method EPA 8020A Batch 6994 Analyst evd <br /> ' Method Description Volatile Organics -Aromatics Units ug/L <br /> < 1` <br /> MB <br /> Method dank 06/29/1999 1958 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F <br /> enzene 0 00 <br /> (Ethylbenzene 0 00 <br /> ethyl.-t-Butyl.iEther (MTBE) 0 00 <br /> oluene 1 0 00 <br /> ylenes (total) 0 00 <br /> 'Page 14 <br /> * %=% REC, R=RPD, A=ABs Diff D=% Diff <br /> !{r !ibe erytyncer reruns ov nxau o nl erpretatroria contared,n thrs IWorl gra bBSea uden,ntumali0+1 arw mate av0oa6a by M cilanr 1,whose esdusrve entl conl,tlen4al use trva report hie bean made The enaly—r r9surts Oplry G interpretations I <br /> cv�essed rept the heat ruapment o,Co a Labo llo,es Cie Ianora�onas mween.maeec rw warranty«renresenteuon eypresa or Imdled or wrr type and eureasry d ecn ms Sema as to urs productr�ntY ura]er oporatlpria or p,oriteaenme pl 'I <br /> ' r 1 ` enY W gas coal«other rnm0 el 1110"11 111 send n conned qn wren wrath eucn rq(prr is usan or rel.ed upon td arty aason wr�letle&Tne span y,61r Mt ba eprudt•Lar� n vmde or in Hari wRlw�r tl e w Sian approval al Gore Lapp ato ea � I f <br /> I Il r <br />