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I L CORE LABORATORIES Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number . 991748 Report Date. 09/09/1999 CUSTOMER iT Group PROJECT; Southland - Martlnea ATTN; Bob Butler QC Type Description Reag Code Lab ID Dilution Factor Date Time 7 Test Method EPA 8260E Batch .. 8274 Analyst gfb Method Description Volatile Organics by GC/MS Units .. ug/L LCS Laboratoty Contrbt Sample D9082501 09/01/1999 1013 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Wrt-Butyl Alcohol (TBA) 1248 41 1000.000000 124 8 37-175 -Isopropyl Ether 54 58 50.000000 109 2 60-138 Ethyl tert-Butyl Ether (ETRE) 50 74 50 000000 101 5 51-143 fethyL-t-Butyl rt-Amyl Methyl Ether 48 30 50 000000 96 6 64-137 Ether (MTBE) 120 85 100 000000 120 8 33-169 2-Dichloroethane 10 57 10 000000 105 7 70-130 ,2-Dibromoethane (EDB) 8 62 10 000000 86 2 70-130 MB Method Blank 09/01/1999 1041 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F utyl AlcohoL (TBA) 0 sopropyL Ether 0 Ethyl tert-Butyl Ether (ETBE) 0 tert-Amyl Methyl Ether 0 tthyl-t-Butyl Ether (MTBE) 0 2-Dichtoroethane 0 l,2-Dibromoethane (EDB) 0 MS Matrix Spike 09082501 991745-6 09/01/1999 1626 Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F Iert-Butyl Alcohol (TBA) 1395 31 1000 000000 O 139 5 34-182 i-Isopropyl Ether 61 77 50 000000 0 123 5 60-131 thyL tert-Butyl Ether (ETBE) 54 58 50 000000 0 109 2 64-138 tert-Amyl Methyl Ether 52 07 50 000004 0 104 1 67-154 9thy[-t-Butyl Ether (MTBE) 160 85 100 000000 25 28 135 6 71-142 2-Dichloroethane 10 94 10 000000 0 109 4 70-130 ,12-Dibromoethane (EDB) 9 73 10 000000 0 97 3 70-130 Ms4 Matrix Spike Duplicate 09082501 991745-6 09/01/1499 1655 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ert-Butyl Alcohol (TBA) 1492 87 1395.31 1000 000000 0 149 3 34-182 7 19 li—IsopropyL Ether 62 46 61 77 50 000000 0 124 9 60-131 1 24 Ethyl tert-Butyl Ether (ETBE) 54 41 54 58 50 000000 0 108 8 64-138 0 29 1ert-Amyl Methyl Ether 53 39 52 07 50 000000 0 106 8 67-154 3 27 0L-t-Butyl Ether (MTBE) 169 40 160 85 100 000000 25 28 145 1 3171-142 x 2-DichLoroethane 11 29 10.94 10 000000 0 112 9 70-130 3 30 Page 11 * X=X REC, R=RPD, A=ABS Diff , D=X Diff 1 The eneM al........no s mla p erelw a morel e0 I are w t are based upon ntdmalion dnd hole ul wppFetl byre cyan!ro wMae exc usive and coni tlental a repo ua made TM-W"rash,Op niuu o nwp c.t— expre66ad represent peel M7^a^I of Gm LaowaldMg{',pre lJm atarwe however Take!np.NrreraY or rapresanlatnn express or mel ted of any type arM expaacly ducbana same es to pre produermry prpper tippet ore d orp}aabbrygg 91 ercy dl ge.s opal IX piper m neral P'OpertY wee or Band In rpnnBc!on wlib whlCh sncn apOrt S lbed IX raked updr for anY rescan wMlaoevp Tlaa report elrell npl pe reIXpOOCatl m whab or m pert artlnut iM whiten approval of Cpe Laboremrys