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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20560-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-52831 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-52831/5 Analysis Batch: 720-52831 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 06230909.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 06/23/2009 2215 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID: LCSD 720-52831/6 Analysis Batch: 720-52831 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 06230910.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 06/23/2009 2249 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 105 107 70-130 2 20 <br /> 1,1,2,2-Tetrachloroethane 99 104 70-130 5 20 <br /> 1,1,2-Trichloroethane 99 97 70-130 2 20 <br /> 1,1-Dichloroethane 106 107 70-130 1 20 <br /> 1,1-Dichloroethene 97 105 70-130 8 20 <br /> 1,2-Dichlorobenzene 106 110 70-130 3 20 <br /> 1,2-Dichloroethane 103 104 70-130 1 20 <br /> 1,2-Dichloropropane 97 97 70-130 0 20 <br /> 1,3-Dichlorobenzene 110 114 70-130 3 20 <br /> 1,4-Dichlorobenzene 106 111 70-130 4 20 <br /> Bromoform 108 101 70-130 6 20 <br /> Bromomethane 93 101 70-130 8 20 <br /> Carbon tetrachloride 109 108 70-130 1 20 <br /> Chlorobenzene 112 110 70-130 2 20 <br /> Dibromochloromethane 107 101 70-130 6 20 <br /> Chloroethane 94 104 70-130 10 20 <br /> Chloroform 107 107 70-130 1 20 <br /> Chloromethane 95 111 70-130 16 20 <br /> cis-1,2-Dichloroethene 103 108 70-130 4 20 <br /> cis-1,3-Dichloropropene 98 95 70-130 3 20 <br /> Dichlorobromomethane 111 109 70-130 1 20 <br /> Methylene Chloride 102 106 70-130 4 20 <br /> Tetrachloroethene 100 102 70-130 1 20 <br /> trans-1,2-Dichloroethene 97 98 70-130 1 20 <br /> trans-1,3-Dichloropropene 94 93 70-130 1 20 <br /> Trichloroethene 104 107 70-130 3 20 <br /> Trichlorofluoromethane 109 117 70-130 7 20 <br /> Vinyl chloride 92 110 70-130 17 20 <br /> Ethylene Dibromide 97 96 70-130 2 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 96 99 70-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 24 Of 29 <br />