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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19654-2 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-50108 Preparation: N/A <br /> LCS Lab Sample ID:LCS 720-50108/3 Analysis Batch: 720-50108 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05120903.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/12/2009 1234 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-50108/7 Analysis Batch: 720-50108 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05120904.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/12/2009 1308 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 105 102 70- 130 3 20 <br /> 1,1,2,2-Tetrachloroethane 97 97 70- 130 0 20 <br /> 1,1,2-Trichloroethane 108 105 70- 130 2 20 <br /> 1,1-Dichloroethane 100 98 70- 130 2 20 <br /> 1,1-Dichloroethene 100 96 70- 130 4 20 <br /> 1,2-Dichlorobenzene 106 104 70- 130 2 20 <br /> 1,2-Dichloroethane 101 97 70- 130 3 20 <br /> 1,2-Dichloropropane 101 104 70- 130 3 20 <br /> 1,3-Dichlorobenzene 110 109 70- 130 1 20 <br /> 1,4-Dichlorobenzene 103 101 70- 130 2 20 <br /> Bromoform 115 107 70- 130 7 20 <br /> Bromomethane 103 96 70- 130 7 20 <br /> Carbon tetrachloride 108 104 70- 130 3 20 <br /> Chlorobenzene 104 101 70- 130 3 20 <br /> Dibromochloromethane 112 106 70- 130 5 20 <br /> Chloroethane 100 98 70- 130 2 20 <br /> Chloroform 102 98 70- 130 4 20 <br /> Chloromethane 100 95 70- 130 5 20 <br /> cis-1,2-Dichloroethene 102 96 70- 130 6 20 <br /> cis-1,3-Dichloropropene 120 115 70- 130 4 20 <br /> Dichlorobromomethane 108 105 70- 130 3 20 <br /> Methylene Chloride 105 102 70- 130 4 20 <br /> Tetrachloroethene 116 115 70- 130 1 20 <br /> trans-1,2-Dichloroethene 104 101 70- 130 3 20 <br /> trans-1,3-Dichloropropene 104 100 70- 130 4 20 <br /> Trichloroethene 107 106 70- 130 1 20 <br /> Trichlorofluoromethane 110 106 70- 130 4 20 <br /> Vinyl chloride 111 107 70- 130 4 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 97 96 70- 130 <br /> Dibromofluoromethane(Surr) 94 94 70- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 16 of 24 <br />