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KDSequoia1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> � (707)792-1So9 QF <br /> � i� 1 <br /> a rAX(707)792 0342 <br /> www sequoillrihs com <br /> Is <br /> URS Corp-Sacramento Project Arco Site 5469 Stockton,CA P403099 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR16605 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/06/04 17 16 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> AnAyte Result Lima Tincts Dilution Bach Prep-rred An2lyzed Method Notes <br /> MW-3(P403099-03)Water Sampled 03/04/04 06 01 Received 03/04/04 1027 <br /> Tert-amyl methyl ether ND 10 Ug/1 1 4030340 03/12/04 03/13/04 EPA S260B <br /> Benzene ND 050 <br /> Tett-bury] alcohol ND 20 <br /> Dr-isopropyl cthei ND 10 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether is 0 50 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> togate Drhronroflumomethane 106 % 84-122 " <br /> ogaire 12-Dichlof oethane-d4 112 `/ 74-135 " <br /> Srnrogote Tolitcfre d8 89% 84-119 <br /> Sutfogate 4-8tonrof1uoiohen_ene 95% 86-119 <br /> MW-4(P403099-04)Water Sampled 03/041414 08 38 Received 03/04/04 10 27 <br /> Tert-amyl methyl ether :4D 200 ug/1 200 4030340 03 12104 03 If 3104 EPA 8260B <br /> Benzene 3100 100 <br /> Tert-butyl alcohol ND 4000 <br /> Di-isopropyl ether ND 200 <br /> 1 2-Dibrotnocthane(EDB) ND 100 <br /> 12-Dichloroethane ND 100 <br /> rthanol ND 20000 <br /> Ethylbcnrene ND 100 " <br /> Fthyl tert-butyl ether ND 200 <br /> Toluene ND 100 <br /> Xylenes(total) ND 100 " <br /> Strttngate Dthtownflrraomethane 103 X 84-122 " <br /> Sun t ogate 1 2-Dichlor oethane-d4 I H)Y. 74-135 " <br /> Stu 1 ogate Toluene-t18 90% 84-119 " <br /> Sun 1 agate 4-13t owoflrron ohen_ene 92'% 86-119 <br /> iota Analytical-Petalhima Tht i c sults in this i c pot 1 upplt to tht vanrplt s urrali_c d fir ace or ,dair,c H uh the,haat <br /> of cuvtodi dor tnrient Unit%s other n r sr-stale d f evulty of e r epos re d ori u x et N c rght <br /> hasiv Tim analttrca/report nuivt he ieptoduecd rrr ftv errhrell <br /> Page 8 of 35 <br />