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., Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequozalabs com <br /> URS Com-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-1(P312285-IOREI)Water Sampled 12/10/03 04 45 Received 12/10/03 09 00 <br /> Surrogate Toluene-d8 111 % 84-119 3120709 12124103 12124103 EPI 8260B <br /> Surrogate 4-Bromofluorobenzene 112% 86-119 <br /> VW-2(P312285-11)Water Sampled 12/10/03 02 42 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3120686 12/24/03 12/24/03 EPA 8260B <br /> Benzene 13 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dichloroethane 48 050 ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " ^ <br /> Ethyl tert-butyl ether ND 10 ^ " <br /> i <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> y enes(total) ND 050 <br /> urrogate Dibromofluornmethane 107% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 108% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromojluorobenzene 103% 86-119 <br /> VW-3(P312285-12)Water Sampled 12/10/03 03 30 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/I 1 3120686 12/24/03 12/24/03 EPA 8260E <br /> Benzene 11 050 " ^ <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 20 050 " <br /> Ethanol ND 100 " ^ <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 " ^ <br /> Methyl tert-butyl ether 50 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 108% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 " <br /> Sequoia Analytical-Petalurna The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> • basis Thzs analytical report must be reproduced in its entirety <br /> Page 15 of 35 <br />