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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br /> ' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnvlronmental Inc Client Project lD Rainwater Car Wash Sampled 05-29-02 <br /> ' of Northern Caldomaa Reference Number 4727 Received 05-30-02 <br /> 837 Shaw Road Sample Description Water Extracted 06-03-02 <br /> Stockton.CA 95215 Sample PreplAnalysis Method EPA 5030/8260 Analyzed 06-03-02 <br /> Attn Tim Cuellar Lab Numbers 4727-6W Reported 06-07-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> ' ANALYTE REPORTING SAMPLE ID <br /> LIMIT MW 6 <br /> 05-29-02 — --- <br /> (ug/L) (ug/L)uglL}� <br /> FUEL OXYGENATES <br /> ' Methyl tert-Butyl Ether(MTBE) 050 270000 <br /> Dr-isopropyl Ether (DIPS) 050 ND <br /> ' Ethyl tert-Butyl Ether (ETBE) 050 ND <br /> tert-Amyl Methyl Ether(TAME) 050 2800 <br /> lietert-Butanol(TBA) 20 ND <br /> VOLATILE HALOCARBONS <br /> 1 2-Dichloroethane (1,2-DCA) 050 ND <br /> Ethylene Dibromide (EDB) 050 ND <br /> Report Limit Multiplication Factor 500 <br /> Report Limit Multiplication Factor for MTBE only 10000 <br /> 1 ' <br /> ' Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 821% <br /> Toluene-d8 984% <br /> Instrument ID Varian Saturn 3&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 /> ' (pglL)= micrograms per liter or pa billion(ppb) <br /> 0 i <br /> ' ANALYST APPROVED BY <br /> Clan Cane Jam C Phillips <br /> oratory Director <br /> I I E I <br /> II i <br /> i <br />