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1551 Industrial Road <br /> Sequoia San Carlos 0 <br /> (650)23 2-960-9600 <br /> Analytical FAX(650) 12 <br /> vwww.s eq u o i al a b s.labs.c com <br /> d. %-Ryan/GeostrategieS(l} Project: Tosco(1) <br /> 6747 Sierra Court;Suite I Project Number: UNOCAL SSW]1195,LATHROP,CA Reported: <br /> Dublin CA.94568 Project Manager: Deanna Harding 08/28/01 07:22 <br /> 'N101atile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Balch 1080067-EPA 5030B IP/Tl <br /> LCS(1080067-BS2) Prepared&Analyzed: 08/17/01 <br /> Methyl Cert-butyl ether 51.4 2.0 ug/1 50.0 103 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 49.6 50.0 99.2 76-114 <br /> Surrogate:Toluene-d8 51.2 50.0 102 88-110 <br /> Matrix Spike(1080067-MSI) Source:L108074-09 Prepared&Analyzed: 08/17/01 <br /> Methyl tert-butyl ether 53.1 2.0 ug/I 50.0 ND 106 60-140 <br /> Surrogate:1,2-Dichloroethane-d4 52.1 50.0 104 76-114 <br /> Surrogate:Toluene-d8 51.8 50.0 104 88-110 <br /> Mairix Spike Dup(1080067-1\7SDI) Source: L108074-09 Prepared&Analyzed:08/17/01 <br /> Methyl Cert-butyl ether 53.7 2.0 ug/l 50.0 ND 107 60-140 1.12 25 <br /> Surrogate:1,2-Dichloroerhane-d4 53.8 50.0 108 76-114 <br /> Surrogate:Toluene-d8 50.0 50.0 100 88-110 <br /> =- 1080068-EPA 5030B I P/TJ <br /> Blank(1080068-BLK1) Prepared&Analyzed: 08/15/01 <br /> Ethanol ND 1000 ugll <br /> 1,2-Dibromoethane ND 2.0 " <br /> 1,2-Dichloroethane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl tert-butyl ether ND 2.0 " <br /> Methyl terl-butyl ether ND 2.0 " <br /> Ten-amyl methyl ether ND 2.0 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate:1,2-Dichloroethane-d4 51.1 50.0 102 76-114 <br /> Surrogate:Toluene-d8 52.8 50.0 106 88-110 <br /> The results in this report apply to the samples anal zed in accordance with the chain o <br /> Analytical -San Carlos p pp3 p � f <br /> custody document. This analytical report must be reproduced in its entirety. <br /> I <br /> Page 19 of 22 <br />