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Quality Control Results <br /> Client: ARCADIS U.S., Inc. Job Number: 720-24241-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-61926 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-61926/4 Analysis Batch: 720-61926 Instrument ID: Agilent 75MSD <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 11230927.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 11/23/2009 2157 Final Weight/Volume: 10 mL <br /> Date Prepared: 11/23/2009 2157 <br /> LCSD Lab Sample ID: LCSD 720-61926/5 Analysis Batch: 720-61926 Instrument ID: Agilent 75MSD <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 11230928.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 11/23/2009 2229 Final Weight/Volume: 10 mL <br /> Date Prepared: 11/23/2009 2229 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Methyl tert-butyl ether 112 108 66-138 4 20 <br /> Acetone 102 94 10-150 8 20 <br /> Benzene 108 108 80-130 0 20 <br /> Dichlorobromomethane 117 114 74-140 2 20 <br /> Bromobenzene 114 113 80-128 1 20 <br /> Chlorobromomethane 106 105 80-126 1 20 <br /> Bromoform 111 107 56-144 3 20 <br /> Bromomethane 98 97 23-171 1 20 <br /> 2-Butanone(MEK) 113 104 60-140 8 20 <br /> n-Butylbenzene 119 119 67-160 0 20 <br /> sec-Butyl benzene 127 128 80-144 1 20 <br /> tert-Butyl benzene 125 126 80-141 1 20 <br /> Carbon disulfide 87 86 38-158 0 20 <br /> Carbon tetrachloride 109 109 69-136 0 20 <br /> Chlorobenzene 110 110 80-122 0 20 <br /> Chloroethane 93 92 51 -149 1 20 <br /> Chloroform 100 100 70-130 0 20 <br /> Chloromethane 85 85 52-136 0 20 <br /> 2-Chlorotoluene 123 124 76-142 1 20 <br /> 4-Chlorotoluene 116 117 78-140 0 20 <br /> Chlorodibromomethane 95 94 68-137 2 20 <br /> 1,2-Dichlorobenzene 117 116 80-127 1 20 <br /> 1,3-Dichlorobenzene 114 115 80-128 0 20 <br /> 1,4-Dichlorobenzene 112 111 80-122 1 20 <br /> 1,3-Dichloropropane 118 115 77-140 3 20 <br /> 1,1-Dichloropropene 109 109 76-140 0 20 <br /> 1,2-Dibromo-3-Chloropropane 114 110 64-136 4 20 <br /> Ethylene Dibromide 114 111 70-143 2 20 <br /> Dibromomethane 111 108 74-137 3 20 <br /> Dichlorodifluoromethane 79 78 38-142 1 20 <br /> 1,1-Dichloroethane 109 108 70-130 1 20 <br /> 1,2-Dichloroethane 113 109 70-133 3 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 42 of 52 <br />