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A N A L t I C A L � <br /> LABORATORIES <br /> QC Summary Report 10/10/2000 <br /> BSK Submission : 2000090726 <br /> Client: BSK and Associates-Sacramento <br /> Date Submitted 09/21/2000 <br /> Project ID : <br /> Project Dose : URSA Engineering <br /> BSK StarLims Run #: 12439 <br /> Analyte Results Matrix %Rec Spike Spk Matrix <br /> Analyte QC Typc Spike ID Result Units or RPD RPD Cone Come <br /> UCL LCL Dale <br /> Ethyl t-Butyl Ether LCS N/A 13.01 pg/L 104 12.5 ND 130 70 10/04/00 Acceptable <br /> Methyl-t-Butyl Ether LCS N/A 11.51 pg/L 92 12.5 ND 130 70 10/04/00 Acceptable <br /> t-Amyl Methyl Ether LCS N/A 13.16 pg/L 105 12.5 ND 130 70 10/04/00 Acceptable <br /> tert-Butyl Alcohol LCS N/A 118.91 pg/L 95 125 ND 130 70 10/04/00 Acceptable <br /> 1,2-Dibromoethane LCSD N/A 12.47 pg/L 99 3 12.5 ND 130 70 10/04/00 Acceptable <br /> 1,2-Dichloroethane LCSD N/A 12.82 pg/L 102 1.3 12.5 ND 130 70 10/04/00 Acceptable <br /> Di-isopropyl Ether LCSD N/A 13.16 pg/L 105 1.4 12.5 ND 130 70 10/04/00 Acceptable <br /> Ethyl t-Butyl Ether LCSD N/A 12.68 pg/L 101 2.6 12.5 ND 130 70 10/04/00 Acceptable <br /> Methyl-t-Butyl Ether LCSD N/A 11.3 pg/L 90 1.9 12,5 ND 130 70 10/04/00 Acceptable <br /> t-Amyl Methyl Ether LCSD N/A 12.97 pg/L 103 1.4 12.5 ND 130 70 10/04/00 Acceptable <br /> ten-Butyl Alcohol LCSD N/A 116.32 pg/L 93 2.2 125 ND 130 70 10/04/00 Acceptable <br /> 1,2-Dibromoethane RBLK N/A 0 pg/L 15 5 N/A 10/04/00 Acceptable <br /> 1,2-Dichloroethane RBLK N/A 0 pg/L <5 5 N/A 10/04/00 Acceptable <br /> Di-isopropyl Ether RBLK N/A 0 pg/L <5 5 N/A 10/04/00 Acceptable <br /> Ethyl t-Butyl Ether RBLK N/A 0 pg/L <5 5 N/A 10/04/00 Acceptable <br /> Methyl-t-Butyl Ether RBLK N/A 0 pg/L <5 5 N/A 10/04/00 Acceptable <br /> t-Amyl Methyl Ether RBLK N/A 0 pg/L <5 5 N/A 10/04/00 Acceptable <br /> ten-Butyl Alcohol RBLK N/A 0 pg/L <50 50 N/A 10/04/00 Acceptable <br /> Surrogate Results <br /> Analyte QC Typc Sun.Result UCL LCL Date <br /> Toluene-d8 LCS N/A 96.5 %Rec 95.6 130 70 10/04/00 Acceptable <br /> Toluene-d8 LCSD N/A 96.4 %Rec 95.6 130 70 10/04/00 Acceptable <br /> Toluene-d8 RBLK N/A 95.6 %Rec 130 70 10/04/00 Acceptable <br /> BSK StarLims Run #: 12484 <br /> Analyte Results Matrix %Rec Spike Spk Matrix <br /> Analyte QC Typc Spike 11) Result Units or RPU RPD Cone Cone UCL LCL Date <br /> Arochlor 1260 LCS N/A 1.02 mg/Kg 81 1.25 ND 130 70 10/04/00 Acceptable <br /> Arochlor 1260 LCSD N/A 0.969 mg/Kg 77 5.1 1.25 ND 130 70 10/04/00 Acceptable <br /> %Rec: Percent Recovered Parent Sample: Sample used as background matrix for MS/MSD Page 7 of 8 <br /> RPD: Relative Percent Difference OOS-High: QC Result Above UCL <br /> UCL: Upper Control Limit OOS-Low: QC Result Below LCL <br /> LCL: Lower Control Limit <br />