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I 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 07-12-05 <br /> P Q Box 578341 Reference Number 8341 Received 07-13-05 <br /> Modesto,CA 95357 Sample Description Water Extracted 07-15-05 <br /> Attn John Cussen Sample PreplAnalysis Method EPA 5030/8260 Analyzed 07-15-05 <br /> Lab Numbers 8341-11W, 12W 13W Reported 07-21-05 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW-11 MW-12 MW-13 <br /> (jig/L) /L /L /L <br />' FUEL OXYGENATES 7 <br /> Methyl tert-Butyl Ether(MTBE) 050 15 ND 20 <br />' Di-isopropyl Ether (DIPE) 050 053 ND ND <br /> i <br /> Ethyl Pert-Butyl Ether (ETBE) 060 ND ND ND <br />' tert-Amyt Methyl Ether(TAME) 050 ND ND ND <br /> tert-Butanol(TBA) 20 73 ND 33 <br /> VOLATILE HALQCARBONS <br />' 1,2-Dichloroethane (1 2-DCA) 050 96 ND ND <br /> Ethylene Dibromide (EDB) 050 ND ND ND <br />' Report Lima Multiplication Factor 1 1 1 <br />' Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 113% 908% 937% <br /> Toluene-d8 105% 964% 940% <br /> Instrument ID Varian 2100T 8 HP 5972 MS <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 pe ter or parts r bi ion (ppb) <br /> . APPROVED BY A APPROVED BY <br />' <br /> Clan7 Cane Jame C P rpS <br /> Laboratory Manager tab tory Director <br /> 1 <br />