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iI-IJ 12IM"W101 nvao <br /> Sequoia Sen Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www aequozaiabs cm <br /> Gettler-Ryan/Geostrategies(I} Project Tosco(1) <br /> 67 <br /> ,fterra Court, Suite I Project Number Former Unocal SS#4409,Stockton,CA Reported <br /> A,94568 Project Manager Deanna Harding 10/26/01 09 39 <br /> I <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Lunits RPD Lunit Notes <br /> Batch 1100051 -EPA 5030B]P/T] <br /> LCS 1100051-BS2 Prepared&Analyzed 10/15/01 <br /> Methyl ten-butyl ether 584 20 ug/l 500 117 70-130 <br /> 5lrrrogare 1,2-Dichloroethane-d4 562 500 112 76-114 <br /> Surrogate Toluene-d8 503 500 101 88-110 <br /> Matrix Spike 1100051-MSI Source: 1.110057-02 Pre aced&Analyzed 10/11/01 <br /> Methyl tent-butyl ether 588 20 ug/l 500 ND 118 60-140 <br /> Swrogate 1,2-Dichloroethane-d4 556 500 111 76-114 <br /> Slwmgaie Toluene-d8 496 500 992 88-110 <br /> Matrix Spike Dup(1100051-MSDI) Source: L110057-02 Prepared&Analyzed 10/11/01 _ <br /> Methyl cert-butyl ether 583 20 ug/t Soo ND 117 60-140 0 851 25 <br /> Sarrogare 1,1 Dichloroethane-d4 534 500 107 76-114 <br /> Surrogate Toluene-d8 494 500 988 88-110 <br /> Batch 1100063-EPA 5030B PIT <br /> Bla 00063-BLKI) Prepared&Analyzed 10/15/01 _._...,. .._ <br /> Ethanal ND 1000 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl teri-butyl ether ND 20 " <br /> Tart-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Stiurogare 1,2 Dichloroeehane-d4 519 500 104 76-114 <br /> Surrogate Toluene-d8 525 300 105 88-110 <br /> SegU a Analytical-Sail Carlos The results m thrs report apply to the samples analysed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />