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Sequoia° 1455 McDowell Blvd North Ste D <br /> Petaluni t,(A 94934 <br /> Analytical (707)192-0342 <br /> FAX(7071 79_0342 <br /> WWW sequwallhs cont <br /> URS Corp-Sacramento Project Arco Site 5469 Stockton,CA P403099 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36605 Reported <br /> Sacramento CA 95833 Protect Manager Jay Johnson 04/06/04 17 16 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Linin Ln[ts Dilution Batch Prcplrtcd Analyzed Method Notes <br /> MW-1(P403099-01)Water Sampled 01/04/04 08 56 Recen ed 03/04/04 10 27 <br /> Tc.rt-amyl methyl ether ND 10 ug/l 1 4030340 03/12/04 03/13/04 EPA S260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopiopyl ether ND 10 <br /> 1,2-Dtbromoethane(EDB) ND 0 50 " " IT " <br /> 12-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether TD 1 0 <br /> Meth-,1 Cert-butyl ether 6 6 0 50 <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 <br /> ogafe Dihiontnfluoionmefhane 101 % 84-12240 " <br /> agate 12-Dtch1maethane-d4 108 % 74-135 <br /> Sutiogaic Toluene-d8 90 % 84-119 <br /> Sin t ogate 4-Bi omoflum oheit.:ene 94 '% 86-119 <br /> 'NW-2(P403099-02)Water Sampled 01/04/04 09 04 Received 03/04/04 10 27 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 4030340 03/12/04 03/13/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 12-Dibromocthane(EDB) ND 0 50 <br /> 1 2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 IT <br /> " " <br /> Methyl text-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes{total) ND 0 50 " <br /> Stf i agate Dihi ontofhtnt nntethane 97'% 84-122 <br /> Srutogate 1 2-Dichlntociliane-d4 102 74-135 <br /> ,Sul i ot;ate Toluene-d8 85 84-119 <br /> Striingate 4-Biontnflrtofoheni ene 89"0 86-119 " <br /> iioia Analytical-Petaluma The tecalis in this tepari apph io the samples anal,:ed in accoidance Hith rhe chain <br /> of custody doctiutent Unless other t,ise vtafed iemlis are reported lin a tiet weight <br /> haws Tliis anali tical t epoi t+oust he i t pi odtict d iti its Pntfreti <br /> Page 7 of 35 <br />