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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20913-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-53598 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-53598/3 Analysis Batch: 720-53598 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 07070908.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 07/07/2009 1226 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID: LCSD 720-53598/4 Analysis Batch: 720-53598 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 07070909.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 07/07/2009 1300 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> 1,1,1-Trichloroethane 112 108 70-130 4 20 <br /> 1,1,2,2-Tetrachloroethane 92 98 70-130 6 20 <br /> 1,1,2-Trichloroethane 109 104 70-130 5 20 <br /> 1,1-Dichloroethane 102 103 70-130 0 20 <br /> 1,1-Dichloroethene 100 98 70-130 2 20 <br /> 1,2-Dichlorobenzene 101 100 70-130 1 20 <br /> 1,2-Dichloroethane 101 104 70-130 3 20 <br /> 1,2-Dichloropropane 104 103 70-130 1 20 <br /> 1,3-Dichlorobenzene 111 109 70-130 2 20 <br /> 1,4-Dichlorobenzene 103 100 70-130 3 20 <br /> Bromoform 100 101 70-130 1 20 <br /> Bromomethane 91 90 70-130 1 20 <br /> Carbon tetrachloride 106 101 70-130 5 20 <br /> Chlorobenzene 104 105 70-130 1 20 <br /> Dibromochloromethane 109 107 70-130 1 20 <br /> Chloroethane 93 92 70-130 1 20 <br /> Chloroform 97 120 70-130 22 20 <br /> Chloromethane 104 104 70-130 0 20 <br /> cis-1,2-Dichloroethene 102 101 70-130 1 20 <br /> cis-1,3-Dichloropropene 101 99 70-130 1 20 <br /> Dichlorobromomethane 107 108 70-130 1 20 <br /> Methylene Chloride 98 99 70-130 1 20 <br /> Tetrachloroethene 115 107 70-130 7 20 <br /> trans-1,2-Dichloroethene 101 97 70-130 4 20 <br /> trans-1,3-Dichloropropene 97 98 70-130 1 20 <br /> Trichloroethene 112 109 70-130 3 20 <br /> Trichlorofluoromethane 98 98 70-130 1 20 <br /> Vinyl chloride 101 101 70-130 0 20 <br /> Ethylene Dibromide 103 99 70-130 4 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 101 98 70-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 30 of 34 <br />