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, c Sequoia 819 Straker Avenue Suite 8 1 Sacramento CA 45834 (916)921-9600 FAX(916)921-0100 Analytical www sequoialabs corn SECOR International-Rancho Cordova Project ARCO 595,Stockton,CA Sampled 611/00 to 6/6100 3017 Kilgore Road,Suite 100 Project Number N/A Received 6/8/00 Rancho Cordova,CA 95670 Project Manager Rus Benkosky Reported 6/19/00 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical- Sacramento Batch Date Date Surrogate Reporting Anal a Number Prepared Analyzed limits Limit Result Units Notes* NW-2(j'&60 continued 5006120-35 Soil Methyl tert-butyl ether 0060134 6115/00 6115100 0 100 ND mg/kg Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " Tert-amyl methyl ether It 0 100 ND " 1,2-Dichloroethane 0100 ND " Ethylene dibromide 0 100 ND " Surrogate 1,2-DCA44 11 rF600-140 920 % MW-2(@65 5006120-36 Soil Tert-butyl alcohol 0060134 6/15100 6115/00 100 ND mg/kg Methyl tert-butyl ether P. 1. " 0 100 ND " Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " yl methyl ether 0 100 ND " ichloroethane 0100 ND " Ethylene dibromide 0 100 ND " Surrogate 1,2-DCA-d4 600-140 916 % _MW-36W 5006120-63 Sot Tert-butyl alcohol 0060134 6115/00 6/17/00 100 ND mg/kg Methyl tert-butyl ether 0 100 ND " Di-isopropyl ether 0 100 ND Ethyl tert-butyl ether 0 100 ND " Tert-amyl methyl ether 0 100 ND " 1,2-Dichloroethane 0100 ND " Ethylene dibromide 0 100 ND " Surrogate 1,2-DCA-d4 600-140 102 % MW-3605 5006120-64 Soil Tert-butyl alcohol 0060134 6115100 6/17/00 100 ND mg/kg Methyl tert-butyl ether 0 100 ND " Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " Tert-amyl methyl ether 0 100 ND " 1,2-Dichloroethane 0100 ND " Ethylene dibromide 0 100 ND " Surrogate 12-DCA-d4 600-140 106 % MW-3600 5006120-65 Soil Tert-butyl alcohol 0060134 6/15/00 6117100 100 ND mg/kg a h yl tert-butyl ether 0 100 - ND " Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions Page 17 of 27