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(D4 �`.Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> Ei y FAX(707)792-0342 <br /> www.scquoialabs.com <br /> C) <br /> URS Corp-Sacramento Prcject:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagerVernon P.Elarth 04/13/05 09;46 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(P504010-05)Water. Sampled:03/27/05 09:00 Received:03130/0511:50 <br /> Tert-amyl methyl ether ND 1.0 ugh 1 5040040 04!05105 04/05/05 EPA 8260B <br /> Benzene 0.78 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene. 0.60 0.50 <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tent-butyl ether 6.6 0.54 " <br /> Toluene 1,4 0.50 " <br /> Xylenes(total) 3.4 0.50 " <br /> Surrogate:D&omofluoromethane 103% 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 105% 74-135 " .. „ <br /> Surrogate:Toluene-d8 99% 84-119 " <br /> Surrogate:4-13romofluoroboizene 112% 86-119 " <br /> MW-6(P504010-06)Water,i Sampled:03/29/05 10:05 Received:03/30/05 11:50 <br /> Tert-amyl methyl ether ND 1.0 ug/1 1 5040080 04/08/05 04/08/05 EPA 8260B <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane 1.1 0.50 " <br /> Ethanol i ND 100 " <br /> Ethylbenzene. ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluorontelhane 100% 84-122 " <br /> Surrogate:1,1-Dichloroethane-d4 102% 74-135 " <br /> Surrogate:Toluene-d8 98% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 110% 86-119 " <br /> Sequoia Analytical-Petaluma,. The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> I� This analytical report must be reproduced in its entirety. <br /> Page 9 of 29 <br />