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I , #Sequoia 985Jarvis Drive t Morgan Hill,CA 95037 • (408)776-9600 k An alytical FAX(408)782-6308 www.scquoialabs.com I URS Corporation[Arcol] Project:ARCO#2130,Stockton,CA MOI0544 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported- Sacramento!CA, eported:Sacramento!CA,95833 Project Manager:Vernon P.Elarth 09/29/05 14:23 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical-Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note VW-12(MO10544-17)Water Sampled:09/12/05 08:55 Received:09/14/05 08:55 tert-Amyl methyl ether ND 0.50 ugll 1 5123007 09/23/05 09/23/05 EPA 8260B Benzene 1.0 0.50 " tert-Butyl alc6hol ND 20 " Di-isopropyl 'ether ND 0.50 " 1,2-Dichloroethane 62 0.50 Ethanol ND 100 " Ethyl tert-butyl ether ND 0.50 " Ethylbenzene ND 0.50 Methyl tert-butyl ether 0.81 0.50 " Toluene ND 0.50 " Xylenes(total) ND 0.50 " Gasoline Range Organics(C4-C12) 160 50 " Surrogate:1,2-Dichloroethane-d4 79% 60-135 " .s MS-1A(MOI0544-18)Water Sampled:09/12/05 09:45 Received:09/14/05 08:55 tert-Amyl methyl ether ND 0.50 ugll 1 5123007 09/23/05 09/23/05 EPA 8260E Benzene 2.2 0.50 " tert-Butyl alcohol ND 20 ^ " Di-isopropyl ether ND 0.50 1,2-Dichloroethane ND 0.50 " Ethanol s ND 100 " Ethyl tert-butyl ether ND 0.50 " Ethylbenzene 0.63 0.50 " Methyl tcrt-butyl ether ND 0.50 " Toluene „ 0.89 0.50 " " Xylenes(total) 2.7 0.50 " Gasoline Range Organics(C4-C12) 200 50 PV Surrogate:1,2-Dichloroethane-d4 80% 60-135 Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of custody document. Unless otherwise stated,results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. Page I 1 of 25 I'