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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> (707)792-1865 <br /> r ► Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <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 /> MW-1 (P403321-01)Water Sampled 03/10/04 04 47 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND r 250 l ug/l 250 4030659 03/23/04 03/23/04 EPA 8260B <br /> Benzene ND 120 -/ <br /> Tert-butyl alcohol ND _ 5000 / " <br /> Di-isopropyl ether ND - 250 <br /> 1,2-Dichloroethane ND 120 " <br /> Ethanol ND - 25000 <br /> Ethylbenzene ND 120 " <br /> Ethyl tert-butyl ether ND 250--, <br /> 50 <br /> Methyl tert-butyl ether 1M4 y AaA 6400 - 120-/ <br /> Toluene b'h+� SV ND—ail 4 ND�-� 120 <br /> Xylenes(total) vY� NDS 120 " <br /> Surrogate Dibromofluoromethane 121 % 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 }til 42%J 74-135 Sol <br /> rogate Toluene-d8 97% 84-119 <br /> rogate 4-Bromofluorobenzene 102% 86-119 " <br /> MW-2(P403321-02)Water Sampled 03/10/04 06 12 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 10 ugll 1 4030659 03/23/04 03/23/04 EPA 8260B <br /> Benzene ND 050 r " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050- <br /> Ethyl <br /> 50-Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050- <br /> Toluene <br /> 50-Toluene ND 050 '- <br /> Xylenes <br /> 50rXylenes(total) ND 0 50' <br /> Surrogate Dibromofluoromethane 120% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 / 141 % 74-135 Sol <br /> Surrogate Toluene-d8 96% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> uoia Analytical-Petaluma 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 This analytical report must be reproduced to its entirety <br /> Page 5 of]5 <br />