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' CORE LABORATORIES 0 U A L I T Y_ C O N T R O L R E S U L T S Job Number 991898 Report Date 09/23/1999 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teichers OC Type Description Reag Code Lab ID Dilution Factor Date Time LC5 Laboratory Control Sample 09090101 09/21/1999 1739 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F enzene 53.25 50 106 5 39-150 thylbenzene 52.12 50 104.2 32-160 Methyl-t-Butyl Ether (MTBE) 233.37 250 93 3 50-150 oluene 53.24 50 106 5 46-148 ylenes (total) 162.29 150 108 2 75-125 LCD Laboratory ControL Sample Duplicate 09090101 09/21/1999 1806 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 52 31 53.25 50 104.6 39-150 _ 1 8 20 thylbenzene 51 37 52 12 50 102 7 32-160 1 4 20 Methyl-t-Butyl Ether (MTBE) 226.83 233 37 250 90 7 50-150 2.8 25 i uene 52 56 53 24 50 105.1 46-148 1 3 20 enes (total) 160 03 162 29 150 106 7 75-125 1 4 20 MS Matrix Spike 04090101 991901-2 _ 09/22/1999 0549 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F enzene 52 25 50 2 44 99 6 39-150 thylbenzene _ 50 93 50 1.28 99.3 32-160 Methyl-t-Butyl Ether (MTBE) 220 48 250 0 51 88 0 50-150 Toluene 52 47 50 9 04 86 9 46-148 ylenes (total) 159 02 150 8 01 100 7 75-125 ' MSD Matrix Spike Duplicate 09090101 991901-2 E 1 09/22/1999 0615 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 54 31 52 25 50 2 44 103 7 39-150 4 20 thylbenzene 52 78 50 93 50 1 28 103.0 32-160 4 20 Methyl-t-Butyl Ether (MTBE) 224 88 220 48 250 0 51 89.7 50-150 2 25 oluene 52 17 52 47 50 9 04 86 3 46-148 1 20 ylenes (total) 164.57 159 02 150 8 01 104 4 75-125 3 20 Page 13 * %=% REC, R=RPD, A=ASS Diff , D=% Diff ene a 1,1 cal enols eon ons or nlerprew—,comaDeo n ins re00rt a e bese0 upon 10�mdIwO E,d male 1al suppled pV MB CI e t}N wisp sa a clusbB ano cpn�inenGa use 1h s e II 1 as peen mane Tisa analis Ca esu pe apon n e,eta Inns p aS,,d n prasenl Injudgment 01"51 judgme01 Ca lAaro Ld oo alor es C00 at0 es n0 were rcle.es 0 war an y or reo...n18t on e p ess m m 1 ed of anv I,-a exp essty.-1.ms same es 10 Ine p 9Uurr 1i o op o or p of tab.ass 01 anV 01 gas opal 0 OInQr m npsl plepeny well or Sane in o0nneol on oo,wnlLn such a Is useo or 01 etl a 0�Icr 81y reespn wnate0 Tn soon en all cl pe epl oducetl n wnple o n-1 w[n 1 In.w non app o aI or G<a L...elpr P1