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' Sequoia 819 striker Ave Se,8 <br /> Settam9830 <br /> Analytical (916(916)92 92 1--9600 <br /> FAX(916)921-0100 <br /> www.sequoielebs.com <br /> ' RNC Environmental LLC Project:Schmidt UST INVESTIGATION <br /> 9746Parktree WayS504150 <br /> Project Number:- S504150 <br /> Elk Grove CA,95624 Project Manager Robert A.Nicholson <br /> 04/20/05 18:50 <br /> GasolineWTEMOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Some %REC RPD <br /> Result Limit Units Level Result %REC Limits RPD Linut Notes <br /> Batch 5040204-EPA 5030B IP/fl/EPA 8260B <br /> ' Matrix Spike(5040204-MSI) Source:S50415"2 Prepared&Analyzed:04/15/05 <br /> Methyl tert-butyl ether 0.0518 0.0050 mg/kg 0.0500 NO 104 60-140 <br /> Benzene 0.0560 0.0050 0.0500 ND 112 60-140 <br /> Toluene 0.0586 0.0050 0.0500 ND 117 60-140 <br /> Surrogate:1,2-DCA-d4 0.0101 0.0100 101 60-140 <br /> Surrogate:Toluene-d8 0.0103 0.0100 103 60-140 <br /> ' Surrogate:4-BFB 0.00914 0.0100 91 60.140 <br /> Matrix Spike(5040204-MS2) Source:S504150-02 Prepared&Analyzed:04/15/05 <br /> Methyl tert-butyl ether 0.0415 0.0050 mg/kg 0.0432 ND 96 60.140 <br /> 1 Benzene 0.0276 0.0050 0.0268 NO 103 60.140 <br /> Toluene 0.174 0.0050 0.152 ND 114 60-140 <br /> Gasoline Range Organics(C4-C12) 2.54 0.50 2.20 ND 115 60.140 <br /> Surrogate:l,2-1-.- 0.00967 " <br /> 1 0.0100 97 60-140 <br /> Surrogate:Toluene-d8 0.0105 0.0100 105 60-140 <br /> Surrogate:4-BFB 0.0116 0,0100 <br /> 776 60.140 <br /> Matrix Spike Dup(5040204-MSD1) Source:S504150-02 Prepared&Analyzed:04/15/05 <br /> Methyl tart-butyl ether0.0508 0.0050 mg/kg 0.0500 ND 102 60-tgp 2 25 <br /> Benzene 0.0543 0.0050 0.0500 NO 109 60.140 3 25 <br /> Toluene 0.0540 0.0050 0.0500 ND 108 60.140 8 25 <br /> Surrogate:1,2-DCA44 0.00975 „ 0.0100 98 60.140 <br /> Surrogate:Toluene-d8 0.00953 0.0100 95 60-140 <br /> Surrogate:4-BFB 0.00959 <br /> 0.0100 96 60.140 <br /> Matrix Spike Dup(5040204-MSD2) Source:S504150-02 Prepared&Analyzed:04/15/05 <br /> Methyl tart-butyl ether -0.0427 0.0050 mg/kg 0.0432 ND 99 60-140'325 <br /> Benzene 0.0274 0.0050 0.0268 NO 102 60.140 0.7 25 <br /> Toluene 0.180 0.0050 0.152 ND 118 60.140 3 25 <br /> Gasoline Range Organics(C4-C12) 2.50 0.50I, 2.20 ND 114 60.140 2 25 <br /> Surrogate:1,2-DC4-d4 0.00936 0.0100 94 60.140 <br /> Surrogate:Tolaene-a 0.0111 0.0100 HI 60.140 <br /> Surrogate:4-BFB 0.01210.0100 121 60.140 <br /> „ <br /> Sequoia Analytical-Sacratnento The remits in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 7 of 8 <br />