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1455 McDowell Blvd North Ste D <br /> 4D <br /> � e ol, Petaluma CA 94954 <br /> Analq� (707)792-1805 <br /> ytical'gy tical CAX(707)792-0342 <br /> www sequotalabs cum <br /> URS Corp-Sacramento Project Arco Site 5469 Stockton CA P403099 <br /> 2870 Gateway Oaks Drive Stnte 300 Project Number WR36605 Reported <br /> Sacramento CA 95833 Project Manager lay Johnson 04/06/04 17 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source 0/,AEC RPD <br /> Analyte Result Limit Units Leel Result %REC Limits RPD Limo Roles <br /> Batch 4030340-EPA 5030B waters <br /> Blank(4030340_BLKI) _ _ Prepared&Analyzed 03/12/04 <br /> 'Pert-atnvl methvl ether NI) 1 0 ugll <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> I 2-Dtbromoethane(EDB) ND 0 50 " <br /> 1 2-Dtchloroethane ND 0 50 " <br /> Fthanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butvl e her ND 1 0 " <br /> Methyl tert-butvl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> nc5(total) ND 0 50 " <br /> r t oga'c Dibt o noflumon etl arc 509 5 00 102 84-122 <br /> Srutogate 12-Dtchlotoethunc-d4 5 06 5 00 101 7d-115 <br /> Strttoguie Toluene-cM 4 37 500 87 84-119 <br /> Suttogale 4-Btomoflumoheircne 474 500 95 86-119 <br /> Laboratory Control Sample(4030340-BSI) Prepared&Analyzed 03/12/04 <br /> Tert-ainvl methyl ether 5 36 1 0 ugll 5 00 107 75-117 <br /> Benzene 5 41 0 50 5 00 108 81-118 <br /> Tort-butyl alcohol ]O8 20 100 108 60-147 <br /> DL-isopropyl ether 5 52 1 0 5 00 110 70-125 <br /> 1 2-Dtbromoethane(EDB) 5 36 0 50 5 00 107 85-125 <br /> 1 2-Dtchloroethane 5 65 0 50 5 00 113 77-126 <br /> Ethanol 114 100 100 114 55-200 <br /> Ethvibenzene 5 63 0 50 5 00 113 89-122 <br /> Ethvl tett-butvl ether 5 58 1 0 5 00 112 71 120 <br /> Methvl Cert-butyl ether 5 30 0 50 5 00 106 70-122 <br /> Toluene 5 33 0 50 5 00 107 84-119 <br /> Xylenefi(total) 17 1 0 50 IT 15 0 114 96-132 <br /> Stuitogate Drhr omoflum onrc thatre 4 89 500 98 84-122 <br /> Snrtogate 12-Dtchloroethane r14 4 75 5 00 95 74-135 <br /> Sttrtogate Toluene-d8 4 58 500 92 84-119 <br /> Surrogate 4-Biotnofltiwohen:ette 4 87 500 97 86-119 <br /> Iola Analytical-Petaluma The iesulty in this repent app11 to the samples anahzed in ucctndance hNh the thain <br /> ofcintodi docanteni Unlevs otlre+urve stated teewhv ate reported tm a net werght <br /> hays This analttic al report nutst he repioduced it its entileti <br /> Page 21 of 35 <br />