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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)'792-IS <br /> 65 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Blarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Unitt Units Thlution Batch Prepared Anatyced Method Note <br /> MW-2(P504013-02RE1)Water Sampled 03/30/05 18 21 Received 03/31/05 12 45 <br /> Ethanol 300 100 ugll 1 5040114 04/13/05 04/13/05 EPA 8260E <br /> Surrogate Dibromofluoromethane 93% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 92% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 " <br /> MW-3(P504013-03)Water Sampled 03/30/05 12 52 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 10 ug/1 I 5040103 04/12/05 04/12/05 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol 280 - 100 " <br /> methylbenzene ND 050 ^ <br /> thyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroelhane-d4 91 % 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 113% 86-119 " <br /> MW-3(P504013-03RE1)Water Sampled 03/30105 12 52 Received 03/31/05 12 45 <br /> Ethanal 130 — 100 u8/l 1 5040114 04/13/05 04/13/05 EPA 8260B <br /> Surrogate Drbromofluoromethane 92% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 91 % 74-135 " <br /> .Surrogate Toluene-d8 95% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 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 /> This analytical report must be reproduced in its entirety <br /> Page 6 of 20 <br />