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+5 , Sequoia 819 Striker Avenue Suite 8 <br />Sacramento CA 95834 <br />916) 921-9600 <br />( <br />Analytical FAX (916) 921-0100 <br />l ON/IT - Sacramento Project ARCO 2168, Stockton, CA Sampled 12/17199 <br />1433 N Market Blvd , #1 Project Number 792229 Received 12/20/99 <br />Sacramento, CA 95834 Project Manager Dave Foley Reported 1/5/00 <br />Volatile Oxygenate Compounds by EPA Method 8260A <br />Sequoia Analytical - Sacramento <br />Batch Date Date Surrogate Reporting <br />Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br />MW -1 (53) <br />5912243-01 <br />Water <br />Tert-butyl alcohol <br />9120273 12/22/99 12/22/99 200 <br />ND <br />ug/l <br />Methyl tert-butyl ether <br />" ^ " 200 <br />344 <br />" <br />Di -isopropyl ether <br />200 <br />400 <br />" <br />Ethyl tert-butyl ether <br />200 <br />ND <br />" <br />Tert-amyl methyl ether <br />200 <br />ND <br />" <br />Surrogate 12 -DCA -d4 <br />600-140 <br />107 <br />% <br />MW -2 (52) <br />5912243-02 <br />Water <br />Tert-butyl alcohol <br />9120273 <br />12/22/99 <br />12/22/99 <br />200 <br />ND <br />ug/l <br />Methyl tert-butyl ether <br />" <br />200 <br />ND <br />1. <br />Di -isopropyl ether <br />200 <br />ND <br />" <br />Ethyl tert-butyl ether <br />200 <br />ND <br />" <br />_Tert-amyl methyl ether <br />" <br />2 00 <br />ND <br />" <br />Surrogate 1 2 -DCA -d4 <br />60 0-140 <br />95 2 <br />MW -3 (53) <br />5912243-03 <br />Water <br />Tert-butyl alcohol <br />9120273 <br />12/22/99 <br />12/22/99 <br />200 <br />ND <br />ug/l <br />Methyl tert-butyl ether <br />200 <br />582 <br />Di -isopropyl ether <br />" <br />200 <br />ND <br />" <br />Ethyl tert-butyl ether <br />" <br />200 <br />ND <br />" <br />Tert-amyl methyl ether <br />200 <br />ND <br />" <br />Surrogate 1,2 -DCA -d4 <br />600-140 <br />100 <br />% <br />MW -4 (58) <br />S912243-04 <br />Water <br />Tert-butyl alcohol <br />9120273 <br />12/22/99 <br />12/22/99 <br />200 <br />ND <br />ug/l <br />Methyl tert-butyl ether <br />11 <br />200 <br />586 <br />" <br />Di -isopropyl ether <br />" <br />200 <br />ND <br />" <br />Ethyl tert-butyl ether <br />200 <br />ND <br />" <br />Tert-amyl methyl ether <br />" <br />200 <br />ND <br />" <br />Surrogate 1,2 -DCA -d4 <br />600-140 <br />936 <br />% <br />MW -5 (54) <br />5912243-05 <br />Water <br />Tert-butyl alcohol <br />9120273 <br />12/22/99 <br />12/22/99 <br />200 <br />ND <br />ug/1 <br />Methyl tert-butyl ether <br />" <br />" <br />200 <br />ND <br />" <br />Di -isopropyl ether <br />200 <br />ND <br />Ethyl tert-butyl ether <br />" <br />200 <br />ND <br />„ <br />Tert-amyl methyl ether <br />" <br />" <br />200 <br />ND <br />Sia Analytical - Sacramento *Refer to end ofreportfor text of notes and definitions <br />Page 4 of 9 <br />