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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: 720-55224 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-55224/2 Analysis Batch: 720-55224 Instrument ID: Chenstation 3 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 08050914.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 08/05/2009 1517 Final Weight/Volume: 10 mL <br /> Date Prepared: 08/05/2009 1517 <br /> LCSD Lab Sample ID:LCSD 720-55224/3 Analysis Batch: 720-55224 Instrument ID: Chenstation 3 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 08050915.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 08/05/2009 1550 Final Weight/Volume: 10 mL <br /> Date Prepared: 08/05/2009 1550 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Methyl tert-butyl ether 96 101 66-138 5 20 <br /> Acetone 111 115 60-140 3 20 <br /> Benzene 99 100 80- 130 1 20 <br /> Dichlorobromomethane 109 111 74-140 1 20 <br /> Bromobenzene 106 106 80- 128 0 20 <br /> Chlorobromomethane 99 102 80- 126 2 20 <br /> Bromoform 97 100 56- 144 3 20 <br /> Bromomethane 101 98 23-171 3 20 <br /> 2-Butanone(MEK) 103 108 60-140 5 20 <br /> n-Butylbenzene 105 104 67-160 1 20 <br /> sec-Butylbenzene 108 106 80-144 2 20 <br /> tert-Butylbenzene 108 106 80- 141 1 20 <br /> Carbon disulfide 96 95 38-158 1 20 <br /> Carbon tetrachloride 115 116 69-136 1 20 <br /> Chlorobenzene 103 102 80-122 1 20 <br /> Chloroethane 109 104 51 -149 4 20 <br /> Chloroform 99 100 78-129 1 20 <br /> Chloromethane 94 95 52-136 1 20 <br /> 2-Chlorotoluene 106 105 76-142 1 20 <br /> 4-Chlorotoluene 104 103 78-140 1 20 <br /> Chlorodibromomethane 96 100 68-137 4 20 <br /> 1,2-Dichlorobenzene 101 101 80-127 0 20 <br /> 1,3-Dichlorobenzene 104 104 80-128 0 20 <br /> 1,4-Dichlorobenzene 102 101 80-122 1 20 <br /> 1,3-Dichloropropane 102 104 77-140 2 20 <br /> 1,1-Dichloropropene 104 104 76- 140 0 20 <br /> 1,2-Dibromo-3-Chloropropane 108 109 64-136 1 20 <br /> Ethylene Dibromide 106 108 70-143 1 20 <br /> Dibromomethane 102 104 74-137 2 20 <br /> Dichlorodifluoromethane 84 82 38-142 2 20 <br /> 1,1-Dichloroethane 102 102 80-126 1 20 <br /> 1,2-Dichloroethane 96 98 70- 133 2 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 43 of 63 08/17/2009 <br />