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Quality Control Results <br /> Client: Shaw Environmental & Infrastructure, Inc Job Number: 720-21697-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-55354 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-55354/2-A Analysis Batch: 720-55355 Instrument ID: Chenstation 3 <br /> Client Matrix: Solid Prep Batch: 720-55354 Lab File ID: 08060904.D <br /> Dilution: 1.0 Units: ug/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 08/06/2009 1107 Final Weight/Volume: 10 mL <br /> Date Prepared: 08/06/2009 0718 <br /> LCSD Lab Sample ID:LCSD 720-55354/3-A Analysis Batch: 720-55355 Instrument ID: Chenstation 3 <br /> Client Matrix: Solid Prep Batch: 720-55354 Lab File ID: 08060905.D <br /> Dilution: 1.0 Units: ug/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 08/06/2009 1139 Final Weight/Volume: 10 mL <br /> Date Prepared: 08/06/2009 0718 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Methyl tert-butyl ether 95 89 69- 125 7 20 <br /> Acetone 117 108 37- 171 8 20 <br /> Benzene 94 95 72- 120 0 20 <br /> Dichlorobromomethane 108 105 64-135 3 20 <br /> Bromobenzene 98 97 77-121 1 20 <br /> Chlorobromomethane 95 94 65-128 1 20 <br /> Bromoform 101 100 58-132 1 20 <br /> Bromomethane 93 94 56-124 1 20 <br /> 2-Butanone(MEK) 108 103 41 -158 4 20 <br /> n-Butylbenzene 105 106 60-145 0 20 <br /> sec-Butylbenzene 102 103 64-137 1 20 <br /> tert-Butylbenzene 100 101 63-134 1 20 <br /> Carbon disulfide 95 96 10-175 1 20 <br /> Carbon tetrachloride 115 114 54-141 1 20 <br /> Chlorobenzene 98 98 70-121 0 20 <br /> Chloroethane 98 99 61 - 125 1 20 <br /> Chloroform 96 94 67- 125 2 20 <br /> Chloromethane 92 92 50- 131 1 20 <br /> 2-Chlorotoluene 101 100 75- 131 1 20 <br /> 4-Chlorotoluene 99 99 76- 129 0 20 <br /> Chlorodibromomethane 97 98 60- 140 0 20 <br /> 1,2-Dichlorobenzene 96 95 73- 126 0 20 <br /> 1,3-Dichlorobenzene 100 100 73- 128 1 20 <br /> 1,4-Dichlorobenzene 97 96 72- 122 1 20 <br /> 1,3-Dichloropropane 101 98 74- 127 3 20 <br /> 1,1-Dichloropropene 101 101 67- 128 0 20 <br /> 1,2-Dibromo-3-Chloropropane 115 109 57-130 6 20 <br /> Ethylene Dibromide 105 102 66-135 3 20 <br /> Dibromomethane 100 98 65-131 2 20 <br /> Dichlorodifluoromethane 78 77 38-120 0 20 <br /> 1,1-Dichloroethane 97 96 67-126 1 20 <br /> 1,2-Dichloroethane 95 93 73-122 3 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 51 of 63 08/17/2009 <br />