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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: 720-53207 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-53207/3 Analysis Batch: 720-53207 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 06290909.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 06/29/2009 1755 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID: LCSD 720-53207/4 Analysis Batch: 720-53207 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 06290910.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 06/29/2009 1829 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 115 101 70-130 13 20 <br /> 1,1,2-Trichloroethane 114 98 70-130 16 20 <br /> 1,1-Dichloroethane 106 110 70-130 3 20 <br /> 1,1-Dichloroethene 101 105 70-130 4 20 <br /> 1,2-Dichlorobenzene 112 109 70-130 3 20 <br /> 1,2-Dichloroethane 116 107 70-130 8 20 <br /> 1,2-Dichloropropane 101 97 70-130 4 20 <br /> 1,3-Dichlorobenzene 111 112 70-130 0 20 <br /> 1,4-Dichlorobenzene 110 110 70-130 1 20 <br /> Bromoform 118 108 70-130 8 20 <br /> Bromomethane 99 101 70-130 2 20 <br /> Carbon tetrachloride 105 109 70-130 3 20 <br /> Chlorobenzene 111 111 70-130 0 20 <br /> Dibromochloromethane 115 106 70-130 9 20 <br /> Chloroethane 103 104 70-130 0 20 <br /> Chloroform 108 110 70-130 2 20 <br /> Chloromethane 114 110 70-130 3 20 <br /> cis-1,2-Dichloroethene 102 111 70-130 9 20 <br /> cis-1,3-Dichloropropene 108 99 70-130 9 20 <br /> Dichlorobromomethane 118 110 70-130 7 20 <br /> Methylene Chloride 110 111 70-130 1 20 <br /> Tetrachloroethene 100 104 70-130 4 20 <br /> trans-1,2-Dichloroethene 98 100 70-130 3 20 <br /> trans-1,3-Dichloropropene 106 94 70-130 12 20 <br /> Trichloroethene 106 106 70-130 0 20 <br /> Trichlorofluoromethane 111 123 70-130 10 20 <br /> Vinyl chloride 113 115 70-130 2 20 <br /> Ethylene Dibromide 111 99 70-130 12 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 99 98 70-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 24 of 34 <br />