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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-20085-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report-Batch: 720-51380 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-51380/3 Analysis Batch: 720-51380 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05290909.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/29/2009 1420 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID: LCSD 720-51380/4 Analysis Batch: 720-51380 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05290910.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/29/2009 1455 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 112 111 70-130 1 20 <br /> 1,1,2,2-Tetrachloroethane 95 96 70-130 1 20 <br /> 1,1,2-Trichloroethane 110 110 70-130 0 20 <br /> 1,1-Dichloroethane 105 103 70-130 2 20 <br /> 1,1-Dichloroethene 110 103 70-130 7 20 <br /> 1,2-Dichlorobenzene 114 116 70-130 1 20 <br /> 1,2-Dichloroethane 105 103 70-130 2 20 <br /> 1,2-Dichloropropane 108 107 70-130 1 20 <br /> 1,3-Dichlorobenzene 124 123 70-130 1 20 <br /> 1,4-Dichlorobenzene 111 112 70-130 1 20 <br /> Bromoform 113 110 70-130 2 20 <br /> Bromomethane 91 87 70-130 5 20 <br /> Carbon tetrachloride 112 109 70-130 3 20 <br /> Chlorobenzene 115 115 70-130 0 20 <br /> Dibromochloromethane 110 109 70-130 0 20 <br /> Chloroethane 100 98 70-130 3 20 <br /> Chloroform 103 100 70-130 3 20 <br /> Chloromethane 95 91 70-130 3 20 <br /> cis-1,2-Dichloroethene 105 105 70-130 0 20 <br /> cis-1,3-Dichloropropene 118 118 70-130 0 20 <br /> Dichlorobromomethane 108 106 70-130 2 20 <br /> Methylene Chloride 102 99 70-130 3 20 <br /> Tetrachloroethene 123 120 70-130 2 20 <br /> trans-1,2-Dichloroethene 101 100 70-130 2 20 <br /> trans-1,3-Dichloropropene 118 114 70-130 3 20 <br /> Trichloroethene 119 118 70-130 0 20 <br /> Trichlorofluoromethane 105 100 70-130 5 20 <br /> Vinyl chloride 100 97 70-130 3 20 <br /> Ethylene Dibromide 109 110 70-130 1 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 100 101 70-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 10 Of 13 <br />