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OfiLAB CORE LABORATORIES Q U A L I T Y C O N T R O L R E S U L T S Job Number 991123 Report Date 06/30/1999 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time LCS Laboratory Control Sample 09060402 06/22/1999 1618 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ert-Butyl Alcohol (TBA) 908 56 1000.000000 90 9 37-175 i-Isopropyl Ether 40 69 50.000000 81 4 60-138 Ethyl tert-Butyl Ether (ETBE) 40 95 50 000000 81 9 51-143 1ert-Amyl Methyl Ether 42 55 50.000000 85 1 64-137 ethyl-t-Butyl Ether (MTBE) 81 96 100.000000 82 0 33-169 ,2-Dichloroethane 9 05 10.000000 90 5 70-130 1,2-Dibromoethane (EDB) 8 37 10.000000 83 7 70-130 Test Method EPA 8260E Batch 6885 Analyst gfb Method Description Volatile Organics by GC/MS Units ug/L MS Matrix Spike 09051803 990881-3 05/25/1999 1130 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Wutyl Alcohol (TBR) 942 52 1000 000000 0 94 3 34-182 propyl Ether 46 10 50 000000 0 92 2 60-131 hy, tert-Butyl Ether (ETBE) 45 41 50 000000 0 90 8 64-138 tert-Amyl Methyl Ether 47 71 50 000000 0 95 4 67-154 t,l2-Dibromoethane thyl-t-Butyl Ether (MTBE) 98 48 100 000000 0 98 5 71-142 2-Dichloroethane 10 43 10 000000 0 104 3 70-130 (EDB) 10 18 10 000000 0 101 8 70-130 MSD Matrix Spike Duplicate 09051803 990881-3 05/25/1999 1159 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F fl-Isopropyl. rt-Butyl Alcohol (TBR) 1083 56 942 52 1000 000000 0 108 4 34-182 14 19 Ether 51 68 46 10 50 000000 0 103 4 60-131 11 24 Ethyl tert-Butyl Ether (ETBE) 51 04 45 41 50 000000 0 102 1 64-138 12 29 rt-Amyl Methyl Ether 51 33 47 71 50 000000 0 102 7 67-154 7 27 Methyl-t-Butyl Ether (MTBE) 110 90 98 48 100 000000 0 110 9 71-142 12 31 12-Dichloroethane 10 98 10 43 10-000000 0 109 8 70-130 5 30 1,2-Dibromoethane (EDB) 10 24 10 18 10.000000 0 102 4 70-130 1 30 LCS Laboratory control Sample 09060402 06/23/1999 1049 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F !rrt-8AU.yL - tyl Alcohol (TBA) 1318 66 1000.000000 131 9 37-175 propyl Ether 42 12 50.000000 84 2 60-138 tert-Butyl Ether (ETBE) 44 41 50 000000 88 8 51-143 Methyl Ether 45 41 50 000000 90 $ 64-137 Page 20 * Y=% REC, R=RPD, A=ABS Diff D=% Diff TM aNkybpal reav/Is OpngnS w�nta o atdt P"rs cMtanetl n to s report are basep Wan nlwma%dµa malar al wpplred Dy the c4en[la Mwse exCNarva entl wnf Oe�IKt oso IM1i opal Das oawr mdpe Toe Bea+teal resW19 ppngne IX mie pets 1 pry B ae W n)prasaM tM beat r gment of Co a l ebaalwres Gae Labaatw es Mwwer ma arrty a rep esenlatsn a wess w-,A.of arm ly.aM D p.W,9 s ams same a,to 1h,0"P tr A'oper--n-,IX polla7ene ss of any a I gas npdt o other-al popery we4 w fdM n soon eppn s sed o relN yppn 1IX any Bdspn wnatspa Br Thls epprl shad opt f>a epoduceD at—1.o n Pan--,ire+nen apt]o a!of Co a Lobo a!p as