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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 /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Station Sampled 07-23-03 <br /> of Northern California Reference Number 5924 Received 07-25-03 <br />' 837 Shaw Road Sample Description Sod Extracted 07-25-03 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 07-26-03 <br /> Attn Tim Cuellar Lab Numbers 5924-1S, 2S 3S,4S,5S Reported 08-18-03 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT EwVV 1 -30 EW 1 -40 EW 1 -50 EW 1 -55 MW 8-25 <br />' m IK (rn !K ) (mg/K (mg/K m IK m IK <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 0 010 ND 022 0 083 0 076 ND <br /> Di-isopropyl Ether (DIPE) 0 010 ND ND NO ND NO <br />' Ethyl tert-Butyl Ether (ETBE) 0 010 ND NO ND NO NO <br /> tert-Amyl Methyl Ether(TAME) 0 010 NO ND ND ND NO <br />' tert-Butanol(TBA) 0 800 NO NO NO NO ND <br /> VOLATILE HALOCARBONS <br />' 1 2-Dichloroethane (1 2-DCA) 0 010 ND NO ND 0 022 ND <br /> Ethylene Dibromide (EDB) 0 010 ND ND NO ND ND <br /> 1 <br /> Report Limit Multiplication Factor 1 1 1 1 1 <br /> Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 837% 780% 668% 744% 764% <br /> Toluene-d8 804% 870% 703% 877% 711% <br />' Instrument ID HP 5972 MS <br /> Analytes reported as NO were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Repo Limit x Report Limit Multiplication Factor <br /> mg/Kg = mdligra er k I gr or p its er million(ppm) <br /> ANALYST APPROVED BY <br /> Clary J Cone Jam Phrllips <br /> L oratory Din9otor <br />