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Sequoia 1455 McDowell Blvd,North Ste <br /> a— ) (707) <br /> Petaalumuma,CA 44454 792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Protect 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 /> MS-2A(P312285-22)Water Sampled 12/10/03 06 44 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ugll 1 3120709 12/24/03 12/24/03 EPA 8260B <br /> Benzene 18 050 " " IF <br /> Tert-butyl alcohol ND 20 " " " IF <br /> Di-isopropyl ether ND 10 " " ^ IF <br /> 1,2-Dtchloroethane 1 1 050 IF It " ^ " <br /> Ethanol ND 100 IF <br /> Ethylbenzene 3 7 050 " IF " ^ IF <br /> Ethyl tert-butyl ether ND 10 n IF " ^ <br /> Methyl tert-butyl ether 060 050 " " <br /> Toluene 20 050 " IF 1. " IF <br /> Xylenes(total) 25 050 " " 1. <br /> Surrogate Dtbromofluoromethane 109% 84-112 " " " IF <br /> Surrogate 1,2-Dichloroethane-d4 115% 74-135 " " " IF <br /> urrogate Toluene-0 103% 84-119 „ II11 <br /> urrogale 4-8romofluorobenzene 106% 86-119 " <br /> MS-2B(P312285-23)Water Sampled 12/10/03 06 55 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 3120709 12/24/03 12/24/03 EPA 82606 <br /> Benzene 13 050 IF IF " ^ <br /> Tert-butyl alcohol 22 20 ^ " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 089 050 " <br /> Ethanol ND 100 IF ^ <br /> Ethylbenzene 30 050 " ^ <br /> Ethyl tert-butyl ether ND 10 IF ^ " IF <br /> Methyl tert-butyl ether 060 050 IF IF IF " IF <br /> Toluene 15 050 ^ ^ <br /> Xylenes(total) 19 050 <br /> Surrogate D►bromofluoromethane 106% 84-111 " <br /> Surrogate 1 1-Dichloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 IF " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 11 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 21 of 35 <br />