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COULAB 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 991898 Report Date 09/23/1999 CUSTOMER IT .Group PROJECT- Southland - Martinez ATTN Rhonda Teichera QC Type Description Reag Code Lab ID Dilution Factor Date Time Test Method EPA 8260B Batch .. : 8616 Analyst gfb Method Description Volatile Organics by GC/MS Units : ug/L LC5 Laboratory Control Sample 09090901 09/17/1999 1121 Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F ert-Butyl Alcohol (TBA) 1126 49 1000 000000 112 6 37-175 i-isopropyl Ether 43 95 50 000000 87 9 60-138 Ethyl tert-Butyl Ether (ETRE) 46 37 50 000000 92 7 51-143 tert-Amyl Methyl Ether 44 38 50 000000 88 8 64-137 ethyl-t-Butyl Ether (MTBE) 103 45 100 000000 103 5 33-169 ,2-Dichloroethane 11 34 10 000000 113 4 70-130 ,2-Dibromoethane (EDB) 9 47 10 000000 94 7 70-130 MB Method Stank 09/17/1999 1149 Parameter/Test Description QC Result QC Result True Value Orig. Value Calc. Result * Limits F k,rtt-AmyL -ButyL Alcohol (TBA) 0 sopropyL Ether 0 L tert-Butyl Ether (ETRE) 0 Methyl Ether 0 ethyl-t-Butyl Ether (MTBE) 0 ,2-Dichloroethane 0 ,2-Dibromoethane (EDB) 0 ' M$ Matrix Spike 09090901 991898-1 F 09117/9999 1803 Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F tert-Butyl ALcohol (TBA) 1430.26 1000 000000 0 143 0 _ 34-182 i-IsopropyL Ether 41 48 50 000000 0 83 0 60-131 thyL tert-Butyl Ether (ETBE) 45 49 50 000000 0 91 0 64-138 tert-Amyt Methyl Ether 42 14 50 000000 0 84 3 67-154 Methyl-t-Butyl Ether (MTBE) 107 32 100.000000 3 02 104 3 71-142 2-Dichloroethane 11 16 10 000000 0 111 6 70-130 ,2-Dibromoethane (EDB) 9 85 10 000000 0 98 5 70-130 MSD Matrix Spike Duplicate 09090901 991898-1 09/17/1999 1831 Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F tert-Butyl Alcohol (TBA) 1120.36 1430 26 1000 000000 0 112 0 34-182 24 19 Y 11-1sopropyt Ether 45 66 41 48 50.000000 0 91 3 60-131 10 24 Ethyl tert-Butyl Ether (ETBE) 48 45 45 49 50 000000 0 96 9 64-138 6 29 Itert-AmyL Methyl Ether 46 63 42 14 50 000000 0 93.3 67-154 10 27 Methyl-t-Butyl Ether (MTBE) 114 45 107 32 100 000000 3 02 111 4 71-142 6 31 -Dichloroethane 12 35 11 16 10 000000 _ 0 123 5 70-130 10 30 Page 14 * %=% REC, R=RPD, A=ABS Diff , D=% Diff me anaM den'' "1"' noweye mantes no wa'arm o en eseemnayt aaswaseere ora use to us"p, st nmes oa ernom'nacenmme�aeae e ,"1 a pes Psap n os o moran ee�ea st sos e.preao'*Penma 0651,dgment of core C,at 1"'Ms o 111-1omaeaataseanna «oroe o.socoor ny ai gas cosi o'e'w m eop,my wt or sndnconecon w m wns,cpne '000' ma 1 not w t*er ann owe v'r.a L—etc es