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1551 lnduslrial Road <br /> Segp.Ola San Carlos 94670 <br /> (6 23 <br /> (fi50)232-9660 <br /> Analytical ww.seqAX o) labs,c rn <br /> wwwsequoialabs.com <br /> r-Ryan/Geostrategies(1) Project: Tosco(l) <br /> 6747 Sierra Colin.Suite J Project Number: UNOCAL SS1!l 1195,LATHROP,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/01 07:22 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Balch 1080068-EPA 50308 JPfFJ <br /> LCS(7080068-BS2) Prepared&Analyzed:08/16/01 <br /> Methyl len-butyl ether 53.7 2.0 ug/l 50.0 107 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 51.8 50.0 104 76-114 <br /> Surrogate:Toluene-d8 54.6 50.0 109 88-110 <br /> LCS(1080068-BS3) Prepared&Analyzed:08/17/01 <br /> Methyl tert-butyl ether 49.7 2.0 ugll 50.0 99.4 70-130 <br /> Surrogate:l,2-Dichloroerhane-d4 51.6 50.0 103 76-174 <br /> Surrogate:Toluene-d8 54.6 50.0 109 88-110 <br /> Matrix Spike(1080068-)751) Source:L108064-03 Prepared&Analyzed: 08/16/01 <br /> Methyl cert-butyl ether 56.3 2.0 ug/I 50.0 4.0 105 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 51.7 50.0 103 76-114 <br /> Surrogate:Toluene-d8 55.0 50.0 110 88-110 <br /> 1�; r`::aic Spike Dup(]080068 M3D1) Source: L108064-03 Prepared&Analyzed:08/16/01 <br /> Methyl ter(-butyl ether 60.9 2.0 ug/I 50.0 4.0 114 60-140 7.85 25 <br /> Surrogate:l,2-Dichloroerhane-d4 51.5 50.0 103 76-114 <br /> Surrogate:Toluene-d8 54.4 50.0 109 88-110 <br /> /oia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 21 of 22 <br />