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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19652-1 <br /> Lab Control Sample/ Method: 524.2 <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-49978 Preparation: N/A <br /> LCS Lab Sample ID:LCS 720-49978/3 Analysis Batch: 720-49978 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05080904.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/08/2009 0949 Final Weight/Volume: 25 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-49978/4 Analysis Batch: 720-49978 Instrument ID: ChemStation 3.0 <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: 05080905.D <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 25 mL <br /> Date Analyzed: 05/08/2009 1023 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 110 113 70- 130 3 20 <br /> 1,1,2,2-Tetrachloroethane 96 102 70- 130 6 20 <br /> 1,1,2-Trichloroethane 97 102 70- 130 5 20 <br /> 1,1-Dichloroethane 105 107 70- 130 2 20 <br /> 1,1-Dichloroethene 101 101 70- 130 0 20 <br /> 1,2-Dichlorobenzene 104 109 70- 130 5 20 <br /> 1,2-Dichloroethane 103 108 70- 130 5 20 <br /> 1,2-Dichloropropane 98 105 70- 130 7 20 <br /> 1,3-Dichlorobenzene 106 109 70- 130 2 20 <br /> 1,4-Dichlorobenzene 105 106 70- 130 1 20 <br /> Bromoform 90 91 70- 130 0 20 <br /> Bromomethane 106 106 70- 130 0 20 <br /> Carbon tetrachloride 118 118 70- 130 0 20 <br /> Chlorobenzene 108 111 70- 130 2 20 <br /> Dibromochloromethane 97 101 70- 130 5 20 <br /> Chloroethane 103 107 70- 130 3 20 <br /> Chloroform 106 108 70- 130 3 20 <br /> Chloromethane 115 117 70- 130 2 20 <br /> cis-1,2-Dichloroethene 104 108 70- 130 3 20 <br /> cis-1,3-Dichloropropene 95 100 70- 130 6 20 <br /> Dichlorobromomethane 103 110 70- 130 7 20 <br /> Methylene Chloride 106 108 70- 130 2 20 <br /> Tetrachloroethene 103 106 70- 130 3 20 <br /> trans-1,2-Dichloroethene 107 107 70- 130 1 20 <br /> trans-1,3-Dichloropropene 90 96 70- 130 6 20 <br /> Trichloroethene 103 110 70- 130 7 20 <br /> Trichlorofluoromethane 117 116 70- 130 1 20 <br /> Vinyl chloride 126 125 70- 130 0 20 <br /> Surrogate LCS% Rec LCSD % Rec Acceptance Limits <br /> 1,2-Dichlorobenzene-d4 97 98 70- 130 <br /> Dibromofluoromethane(Surr) 102 101 70- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 20 of 24 <br />