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I <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 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 8341-1W 2W, 3W,4W 5W Reported 07-21-05 <br />' GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> �A)} LIMIT MW-1 MW-2 MW-3 MW-4 MW-5 <br /> IL IL IL IL /L /L <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 270 91 41 44 26 <br /> tDi-isopropyl Ether (DIPE) 050 ND 072 ND ND ND <br /> Ethyl tert-Butyl Ether (ETBE) 050 'Z6�ND ND ND ND ND <br />' tert-Amyl Methyl Ether(TAME) 050 �ND ND ND ND ND <br /> tent-Butanol(TBA) 20 G100 ND 35 ND ND ND <br /> VOLATILE HALOCARBONS <br /> 1 <br />' 1,2-Dichloroethane (1,2-DCA) 0� G� ND ND 85 79 ND <br /> Ethylene Dibromide (EDB) 25/ 050 t ND ND ND ND ND <br /> oma' <br />' Report Limit Multiplication Factor 50' 1 1 1 20* <br /> 1 <br /> Report limit raised due to matnx interference <br />' Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 975% 938% 109% 775% 903% <br /> Toluene-d8 982% 870% 102% 814% 973% <br />' Instrument ID Varian 2100T&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 /> (pg1L)= micrograms per I#q or parts per io (ppb) <br /> APPROVED LAY APPROVED BY <br />' Clan J tone James C h <br /> Laboratory Manager Labors ry Director <br />