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' CASTLE ANALYTICAL LABORATORY <br /> . Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209384-2930 <br /> Fax (209) <br /> Certificate#2480 384 1507 <br />' California Geophysical Client Project ID Beneto#8 Sampled 07-12-05 <br /> P O 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 Prep/Analysis Method EPA 5030/8260 Analyzed 07-15-05 <br /> Lab Numbers 8341-6W,7W 8W,9W, 10W Reported 07-21-05 <br />' GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> t ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW-6 MW-7 MW-8 MW-9 MW-10 <br /> (Wg/L !L IL /L /L /L <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 056 92 48 21 ND <br />' Di-isopropyl Ether (DIPE) 050 75 63 085 90 17 <br /> Ethyl tert-Butyl Ether (ETBE) 050 ND ND ND ND ND <br />' tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND ND <br /> tert-Butanol(TBA) 20 ND ND 33 30 ND <br /> VOLATILE}fALOCARBONS _ _ <br />' 1 2-Dichloroethane (1 2-DCA) 050 059 ND 0 71 065 ND <br /> s� <br /> Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br /> i <br /> Report Limit Multiplication Factor 1 10* 1 1 7 1 <br />' *Report omit raised due to matrix interference <br /> ' Surrogate Recovenes <br /> 91 6% 100% 930% 938% 918% <br /> Toluene-d8 <br /> ethane d4 ° 993% 871% 101% 849% <br /> Toluene-d8 101�° <br /> Instrument ID Varian 2104T&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 per r or pa pe billion(ppb) <br /> . APPROVED BY APPROVED BY <br /> ' Clan one James Phr lrps <br /> Laboratory Manager Labo tory Director <br /> 1, <br />