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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20071-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-51172 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-51172/3 Analysis Batch: 720-51172 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05270906.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/27/2009 1502 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID: LCSD 720-51172/4 Analysis Batch: 720-51172 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05270907.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/27/2009 1537 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 123 121 70-130 1 20 <br /> 1,1,2,2-Tetrachloroethane 99 90 70-130 9 20 <br /> 1,1,2-Trichloroethane 114 112 70-130 2 20 <br /> 1,1-Dichloroethane 119 113 70-130 5 20 <br /> 1,1-Dichloroethene 110 110 70-130 1 20 <br /> 1,2-Dichlorobenzene 111 107 70-130 3 20 <br /> 1,2-Dichloroethane 122 111 70-130 9 20 <br /> 1,2-Dichloropropane 108 103 70-130 4 20 <br /> 1,3-Dichlorobenzene 118 116 70-130 2 20 <br /> 1,4-Dichlorobenzene 110 105 70-130 5 20 <br /> Bromoform 119 114 70-130 5 20 <br /> Bromomethane 94 95 70-130 1 20 <br /> Carbon tetrachloride 121 122 70-130 1 20 <br /> Chlorobenzene 107 109 70-130 2 20 <br /> Dibromochloromethane 113 111 70-130 2 20 <br /> Chloroethane 109 105 70-130 3 20 <br /> Chloroform 110 127 70-130 14 20 <br /> Chloromethane 105 99 70-130 6 20 <br /> cis-1,2-Dichloroethene 102 115 70-130 12 20 <br /> cis-1,3-Dichloropropene 117 110 70-130 6 20 <br /> Dichlorobromomethane 121 116 70-130 4 20 <br /> Methylene Chloride 117 113 70-130 3 20 <br /> Tetrachloroethene 110 111 70-130 2 20 <br /> trans-1,2-Dichloroethene 113 114 70-130 1 20 <br /> trans-1,3-Dichloropropene 119 112 70-130 5 20 <br /> Trichloroethene 115 118 70-130 3 20 <br /> Trichlorofluoromethane 111 110 70-130 1 20 <br /> Vinyl chloride 108 104 70-130 3 20 <br /> Ethylene Dibromide 114 105 70-130 8 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 96 96 70-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 15 of 21 <br />