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6 <br /> 1551 lndusinal Road <br /> Sequoia San Carlos CA 94070 <br /> (D (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> Analytical <br /> WWW sNuoialabs com <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite I Project Number Tosco(Unocal)SS46981,Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 12/27/01 09 39 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> - -� -- - - - -�-�- - - - Sequoia Analytical - San Carlos <br /> ReportmgSpike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120086-EPA 5030B IP/TJ <br /> Blank(1120086-BLK2) Prepared&Analyzed 12/21/01 - <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl ten-butyl ether ND 1 0 " <br /> Methyl ter]-butyl ether ND 1 0 " <br /> Teri-amyl methyl ether ND 1 0 " <br /> Teri-butyl alcohol ND 20 " <br /> Surrogate 1,2-Drchloroethane-d4 457 500 914 70-130 <br /> Surrogate Toluene-d8 512 500 102 70-130 <br /> LCS(1120086-BS]) Prepared&Analyzed 12/21/01 <br /> Methyl ten-butyl ether 543 10 ug/l 500 109 70-130 <br /> Surrogate 12-Dichloroerhane-d4 447 Soo 894 70-130 <br /> Surrogate Toluene-d8 348 500 110 70-130 <br /> LCS(1120086-BS2) Prepared&Analyzed 12/21/01 <br /> Methyl cert-butyl ether 579 10 ugA Soo 116 70-130 <br /> Surrogate 1,2-D:chloroethane-d4 464 500 928 70-130 <br /> Surrogate Toluene-d8 554 500 111 70-130 <br /> Matrix Spoke(1120086-MSI) Source: LI 12085-02 Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether 107 10 ug/l 100 ND 107 60-140 <br /> Surrogate 12-Dichloroerhone-d4 421 500 842 70-130 <br /> Surrogate Toluene-d8 592 500 118 70-130 <br /> Matrix Spike Dup (1120086-NISD1) Source Ll 12085-02 Prepared&Analyzed 12/21/01 <br /> Methyl ten butyl ether 113 1 0 ug/l 100 ND 113 60-140 545 25 <br /> Surrogate 12-Dichloroethane-d4 435 500 870 70-130 <br /> Surrogate Toluene48 .583 -500 117 70-130 <br /> Sequola Analytical-San Carlos The results to this report apply to the samples anal}ned in accordance wrth the chain a <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 19 of 22 <br />