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'i <br /> Sequoia 1455 McDowell Blvd,North;Ste D <br /> Petaluma,CA 44954 <br /> { � <br /> ,i'-.°;t�'('s��.��tical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoiaiabs.com <br /> !1 tI <br /> j URS Corp-Sacramento i. Project: Arco Site 6100,Tracy,CA P309366 s <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36619 Reported: <br /> t Sacramento CA,95833 Project Manager: Jay Johnson 10/06/03 18:00 <br /> ' Volatile Organic Compounds by EPA Method 8260B <br /> El <br /> Sequoia Analytical-Petaluma <br /> ' Reporting <br /> Anal e i <br /> 3t Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-2'(P309366-01)Water Sampled:09/19/03 05:05 Received:09/19/03 08:00 1 <br /> Tert-amyl methyl ether ND 2.0 ugll 2 3100069' 10/03/03 10/03/03 EPA 8260B <br /> Benzene ND 1.0 <br /> Tert-butyl alcohol ND 40 <br /> Di-isopropyl ether ND 6i 2.0 <br /> 1,2-Dibiomoethane(EDB) ND 1.0 1 <br />} 1,2-Dichloroethane ND' 1.4 <br /> Ethanol! ND 'i 200 <br /> Ethylbenzene ND '-. 1.0 <br /> ij <br /> Ethyl tert-butyl ether ND 2.0 " <br /> Methyl Cert-butyl ether ND '' 1.0 <br /> Toluene ND 1.0 <br /> I Xylenes(total) ND 1.0 " <br /> Surrogate:Dibromgfluoron:ethanc 106% 84-122 11 <br /> Surrogate:1,2-Dichloroethane-d4 85% 74-135 # <br /> I. Surrogate: Toluene-d8 105% 84419 <br /> Surrogate:4-Bromofluorobenzene 98°/n 86-119 <br /> VW-6(P309366-02)Water Sampled:09/19/03 04:57 Received:09/19/03 08:00 <br /> Tert-amyl methyl ether ND •500 ug/1 500 3100069 10/03/03 10/03/03 EPA 8260E 4 <br /> .Benzene 5900 ` .,250 <br /> j Tert-buiyl alcohol ND 10000 <br /> Di-isopropyl ether ND 1500 <br /> i. 1,2-Dibiomocthane(EDB) NDx,,250 <br /> {Q , <br /> r 1,2-Dic}iloroethane ND i250 " # <br /> Ethanol ND 50000 #} <br /> Ethylbenzene ND 250 <br /> Ethyl tert-butyl ether ND `500 <br /> Methyl tert-butyl ether ND 1250 <br /> Toluenes ND :250 f <br /> Xylenes(total) ND 250 <br /> Surrogate:Dibr-omofluaromethane 100% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 82% 74-135 " <br /> Surrogate:Toluene-d8 105% 84419 1 <br /> Surrogate:4-Brontgfluorobenzene 96% 86-119 <br /> i; <br /> - r <br /> Sequoia Analytical-Petaluma 1i The results in this report Apply to the samples analyzed in accordance with the chain <br /> of custod-v document. Unless otherwise.stated,results are reported on a wet weight <br /> basis. This analytical report must he reproduced in its entirety. <br /> Page 4 of 9 <br />