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� Acculabs Inc. - Davis ACCULABB, INC. <br /> EPA 8270C QC Report <br /> Matrix: Water I jDate Extracted: 4/5/00 <br /> rC Batch: BW000402 Date Anal zed: 4/10/00 <br /> QC Limits Set: 8/18/99 <br /> Spike Conc LCS LCSD Control Chart Limits <br /> Parameter u % Rec % Rec RPD Lower Upper <br /> 1,4-Dichlorobenzene 100 75 72 4.1 44 94 <br /> N-Nitroso-di-n- ropylamine 100 86 76 12.2 46 112 <br /> 1,2,4-Trichlorobenzene 100 73 67 7.8 47 107 <br /> Acenaphthene 100 91 89 2.7 63 105 <br /> 2,4-Dinitrotoluene 100 99 98 0.7 36 115 <br /> Pyrene 100 90 82 9.0 34 110 <br /> ' Control Chart Limits <br /> Surrogate Compounds Lower Upper <br /> Nitrobenzene-d5 52 115 <br /> 2-Fluorobi henyl 58 109 <br /> Terphenyl-d 14 40 129 <br /> ToAK <br /> oka <br /> Labora ory Director <br /> C:\EXCEL\QC\BW000402.XLS <br />