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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19330-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-49823 Preparation: N/A <br /> LCS Lab Sample ID:LCS 720-49823/1 Analysis Batch: 720-49823 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05010905.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/01/2009 1300 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-49823/2 Analysis Batch: 720-49823 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05010906.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/01/2009 1334 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 92 94 70- 130 2 20 <br /> 1,1,2,2-Tetrachloroethane 113 101 70- 130 12 20 <br /> 1,1,2-Trichloroethane 116 105 70- 130 11 20 <br /> 1,1-Dichloroethane 103 99 70- 130 4 20 <br /> 1,1-Dichloroethene 92 93 70- 130 1 20 <br /> 1,2-Dichlorobenzene 106 104 70- 130 2 20 <br /> 1,2-Dichloroethane 100 92 70- 130 8 20 <br /> 1,2-Dichloropropane 104 99 70- 130 5 20 <br /> 1,3-Dichlorobenzene 103 105 70- 130 1 20 <br /> 1,4-Dichlorobenzene 103 101 70- 130 2 20 <br /> Bromoform 101 92 70- 130 10 20 <br /> Bromomethane 98 96 70- 130 3 20 <br /> Carbon tetrachloride 100 102 70- 130 2 20 <br /> Chlorobenzene 105 104 70- 130 0 20 <br /> Dibromochloromethane 111 105 70- 130 5 20 <br /> Chloroethane 95 91 70- 130 4 20 <br /> Chloroform 98 95 70- 130 4 20 <br /> Chloromethane 102 96 70- 130 6 20 <br /> cis-1,2-Dichloroethene 105 104 70- 130 1 20 <br /> cis-1,3-Dichloropropene 106 100 70- 130 6 20 <br /> Bromodichloromethane 113 106 70- 130 6 20 <br /> Methylene Chloride 118 110 70- 130 6 20 <br /> Tetrachloroethene 103 105 70- 130 2 20 <br /> trans-1,2-Dichloroethene 99 95 70- 130 4 20 <br /> trans-1,3-Dichloropropene 109 97 70- 130 11 20 <br /> Trichloroethene 105 101 70- 130 4 20 <br /> Trichlorofluoromethane 107 110 70- 130 2 20 <br /> Vinyl chloride 111 104 70- 130 7 20 <br /> Ethylene Dibromide 114 102 70- 130 11 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 100 98 70- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 13 of 16 <br />