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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arca Site 548,Stockton,CA P306036 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 06/18/03 15:44 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Repotting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method No <br /> MW-1(P306036-01)Water Sampled:06/03/03 09:58•Received:06/03/03 11:35 R-05 <br /> Ethanol ND 1000 ug/1 10 3060377 06/16/03 06/17/03 EPA 8260D <br /> Surrogate:Dibromofluoromethane 96% 84422 <br /> Surrogate: 1,2-Dichloroethane-d4 101 % 74-135 <br /> Surrogate:Toluene-d8 103% 84-119 " <br /> MW-2(P306036-02)Water Sampled:06/03/03 09:30 Received:06/0310311:35 <br /> Ethanol ND 100 ug/1 1 3060377 06/16/03 06/17/03 EPA 8260B <br /> Surrogate:Dibromofluoromethane 99% 84-122 ^ " <br /> Surrogate:1,2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate:Toluene-d8 103% 84-119 " <br /> MW-3P(P306036-03)Water Sampled:06/03/03 08:59 Received:06/03/03 11:35 <br /> Ethanol ND 100 ug/l 1 3060377 06/16/03 06/17/03 EPA 8260E <br /> Surrogate:Dibromofluoromethane 96% 84-122 " <br /> Wrrogate:1,2-Dichloroethane-d4 103% 74-135 <br /> rrogate:Toluene-d8 101 % 84-119 " <br /> MW-4P(P306036-04)Water Sampled:06/0310310:08 Received:06/03/03 11:35 <br /> Ethanol ND 100 ug/l 1 3060377 06/16/03 06/17/03 EPA 8260B <br /> Surrogate:Dibromofluoromeihane 95% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate:Toluene-d8 102% 84-119 " <br /> MW-5P(P306036-05)Water Sampled:0610310310:48 Received:06/03/03 11:35 <br /> Ethanol ND 100 ug/i 1 3060386 06/17/03 66/17/03 EPA 8260B <br /> Surrogate.-Dibromofluoromethane 105% 84-122 ^ " <br /> Surrogate:1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate:Toluene-d8 100% 84-119 ^ ^ <br /> �equoia 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 3 of 8 <br />