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1 <br /> Sequoia 1455McDowek9talNorth$It49 l3 <br /> Petaluma,CA 94954 <br /> (707)792-tti65 <br /> Analytical FAX(707)792-0342 <br /> w -Wquoralabsco,n <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P503205 <br /> 3017 IGlgare Road Suite 100 Project Number WR 63964 Reported , <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/30/05 12 44 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma ' <br /> Rcputmg <br /> Analyte Rrsuii limit Units Dilution Batch Prepared Analyzed Method Not <br /> MID-2(P503205-07)Water Sampled 03/15/05 12 35 Received 03116/05 I1 40 pC ' <br /> Benzene ND 050 uSA 1 5030233 03123/05 03/23/05 EPA 8260B <br /> Ethylbenzene ND 050 - <br /> Methyl tett-butyl ether ND 050 • • ' <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluorotnethane 117% 84-112 • • - ' <br /> Surrogate 1 2-Dichloroethane-d4 111% 74-135 « <br /> Surrogate Tohxne-d8 107% 84-119 ~ « <br /> EFF(P503205-08)Water Sampled 03/1510512 30 Received 03/16/05 1140 <br /> Benzene ND 050 ug/1 1 5030223 03/22/05 03/22/05 EPA 8260B ' <br /> Ethylbenzene ND 050 • « <br /> Methyl tett-butyl ether ND 0 50 <br /> Toluene ND 050 • « <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 10/% 74-135 " " • <br /> Surrogate Toluene-d8 96% 84-119 • + • • ' <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> Sequoia Analytical-Petaluma The results rh this rrt 1 to the sampler P°r crpp y analysed rn accordance with the chain of <br /> custody doeumeht Unless otherwise.crated,mruhs are reported on a wet weight basis. <br /> 77d$analyrrcal report must be reproduced in its entirety <br /> Page 9 of 20 <br /> I <br />