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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br />' California Geophysical Client Project ID Beneto#8 Sampled See Below <br /> P O Box 578341 Reference Number 8403 Received 07-28-05 <br />' Modesto,CA 95357 Sample Description Water Extracted 08-02-05 <br /> Attn John Cussen Sample Prep/Analysis Method EPA 5030/8260 Analyzed 08-02-05 <br /> Lab Numbers 8403-3W 6W Reported 08-10-05 <br />' GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE ID <br /> LIMIT MW-16-50' MW-14-50' <br />' (pg/L) (Ng1L) (pglL) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 1 8 ND <br />' Di-isopropyl Ether (RIPE) 050 077 ND <br /> Ethyl tert-Butyl Ether (ETBE) 050 ND ND <br />' tert-Amyl Methyl Ether(TAME) 050 ND ND <br />' tert-Butanol(TBA) 20 ND ND <br /> VOLATILE HALOCARBONS <br />' 1,2-Dichloroethane (1,2-DCA) 050 ND ND <br /> Ethylene Dibromide (EDB) 050 ND ND <br />' Report Limit Multiplication Factor 1 1 <br />' Date Sampled 07-27-05 07-28-05 <br />' Surrogate Recoveries <br /> 1,2-Dichforoethane-d4 890% 953% <br /> Toluene-I8 875% 959% <br /> Instrument ID Varian 2100T <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (pg/L)= micrograms perNer or parts per billion(ppb) <br /> APPROVED BY APPROVED BY <br /> Clan J Cone J me Phillips <br /> Laboratory Mana rIllabor2tory Director <br />