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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (7"792-1865 <br /> Analytical FAX(707)792-0342 <br /> www mquoialabs_com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Dnve Swte 300 PrajectNumber- Intnm-50293 Repo: <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 82601B <br /> Sequoia Analytical-Petaluma <br /> Reportmg <br /> Analyte ltcsiilt L mit Units Dduuon Batch Prepared Analyzed Method Notes <br /> MS-3B(P306252-16)Water Sampled 06/11/03 08.57 Received 06/12/03 1145 <br /> Tert-amyl methyl ether ND 10 ug/I 1 3060661 06!25/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether NFU 10 <br /> Ethanol ND 100 » „ <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tent-butyl ether 9.4 050 <br /> Surrogate Dibromofluoromethane 87% 84-122 ^ r <br /> Surrogate 1 2-D:chloroethane-d4 93% 74-135 <br /> Surrogate Toluene-d8 108% 84-119 ^ ^ <br /> MW-1 (P306252-17)Water Sampled 06/11/03 07 45 Received:06/12/03 11 45 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060638 06/25/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 n „ ^ <br /> Di-isopropyl ether ND 10 <br /> 1 tert-butyl ether ND 1 0 ^ <br /> ethyl tent-bury]ether ND 0 50 ^ ^ „ ^ „ <br /> Surrogate Dibromofluoromethane 94% 84-122 » ^ ^ <br /> Surrogate 1,24hchloroethane-d4 99% 74-135 ^ » <br /> Surrogate Toluene-d8 103% 84-119 A A ^ <br /> MW-2(P306252-18)Water Sampled 0611110311.10 Received 06/1210311.45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060397 06/17/03 06/17/03 EPA 8260B <br /> 'Pert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 ^ ^ ^ <br /> „ <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 0 50 ^ ^ ^ ^ <br /> Surrogate Dibromofluoromethane 102% 84-122 ^ <br /> Surrogate 1,2-DzchIoroethane-d4 102% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 ^ A <br /> oia Anal cal-Petaluma <br /> 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 16 of 27 <br />