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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 GeoEnvironmentai, Inc Client Project ID Cal Fuels Sampled 04-04-03 <br /> of Northern California Reference Number 5632 Received 04-08-03 <br /> 837 Shaw Road Sample Description Water Extracted 04-09-03 <br /> Stockton CA 95295 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04-09-03 <br /> Attn Tim Cuellar Lab Numbers 5632-1W, 2W,3W 4W, 5W Reported 04-18-03 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GUMS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE IO SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 040403 040403 040403 040403- —040403 <br /> (dig/L) (ug/l-) (uglL) (ug/L) (ug/L) (ug/L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND ND ND ND 1 1 <br /> Di-isopropyl Ether (DIPS) 050 ND ND ND ND ND <br /> IEthyl tent-Butyl Ether (ETRE) 050 ND ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 0 50 ND ND ND ND ND <br />' tert-Butanol(TBA) 20 ND ND ND ND ND <br />' VOLATILE HALDCARBONS <br /> 1,2-t7ichloroethane (1 2-DCA) 050 ND ND 1 8 ND 0 98 <br /> Ethylene Dibromide (EDB) 150 ND ND ND ND ND <br /> I <br /> Report Limit Multiplication Factor 1 1 2' 10* 1 <br /> I <br /> Report limit raised due to matnx interference <br /> Surrogate Recoveries <br /> 12-Dichloroethane-d4 123% 109% 934% 980% 110% <br /> Toluene-d8 873% 847% 989% 71 7% 71 9% <br /> Instrument ID Varian Saturn 3 MS&HP 5972 MS <br />' Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Peporting Limit x Report Limit Multiplication Factor <br /> (pg/L)= micrograms per liter or parts per billion(ppb) <br /> ANALYST APPROVED BY <br /> Clan J Cone Jam9d C Phillips <br />' La ratory Director <br /> I <br />