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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-30690-1 <br /> Lab Control Sample/ Method: 8260B <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-78911 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-78911/5 Analysis Batch: 720-78911 Instrument ID: HP9 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 09281024.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 09/28/2010 2039 Final Weight/Volume: 10 mL <br /> Date Prepared: 09/28/2010 2039 <br /> LCSD Lab Sample ID: LCSD 720-78911/6 Analysis Batch: 720-78911 Instrument ID: HP9 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 09281025.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 09/28/2010 2112 Final Weight/Volume: 10 mL <br /> Date Prepared: 09/28/2010 2112 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1-Dichloroethene 89 90 64-128 1 20 <br /> 1,1-Dichloroethane 94 96 70-130 1 20 <br /> Dichlorodifluoromethane 52 52 33-125 1 20 <br /> Vinyl chloride 81 82 65-156 2 20 <br /> Chloroethane 90 91 62-138 2 20 <br /> Trichlorofluoromethane 96 103 74-146 7 20 <br /> Methylene Chloride 97 100 73-147 3 20 <br /> trans-1,2-Dichloroethene 97 98 75-131 0.8 20 <br /> cis-1,2-Dichloroethene 102 102 70-130 0.006 20 <br /> Chloroform 98 99 70-130 1 20 <br /> 1,1,1-Trichloroethane 102 103 70-130 2 20 <br /> Carbon tetrachloride 103 104 77-146 1 20 <br /> 1,2-Dichloroethane 95 94 70-126 1 20 <br /> Trichloroethene 97 97 70-130 0.1 20 <br /> 1,2-Dichloropropane 101 101 70-130 0.7 20 <br /> Dichlorobromomethane 108 108 70-130 0.3 20 <br /> trans-1,3-Dichloropropene 104 104 70-130 0.006 20 <br /> cis-1,3-Dichloropropene 104 104 70-130 0.3 20 <br /> 1,1,2-Trichloroethane 103 102 86-135 2 20 <br /> Tetrachloroethene 92 92 70-130 0.3 20 <br /> Chlorodibromomethane 107 105 78-145 1 20 <br /> Chlorobenzene 98 98 70-130 0.8 20 <br /> Bromoform 106 102 68-136 4 20 <br /> 1,1,2,2-Tetrachloroethane 102 100 70-130 2 20 <br /> 1,3-Dichlorobenzene 97 98 70-130 0.8 20 <br /> 1,4-Dichlorobenzene 98 99 82-113 0.7 20 <br /> 1,2-Dichlorobenzene 96 97 70-130 1 20 <br /> Chloromethane 78 80 52-175 2 20 <br /> Bromomethane 92 92 43-151 0.2 20 <br /> 1,1,2-Trichloro-1,2,2-trifluoroethane 89 90 42-162 1 20 <br /> EDB 99 96 70-130 3 20 <br /> 1,2,4-Trichlorobenzene 88 86 70-130 2 20 <br /> TestAmerica San Francisco Page 20 of 25 <br />