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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 GeoEnvironmental Inc Client Project ID Top Filling Sampled 12-04-02 <br />' of Northern California Reference Number 5290 Received 12-05-02 <br /> 837 Shaw Road Sample Description Water Extracted 12-09-02 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 12-09-02 <br /> Attn Tim Cuellar Lab Numbers 5290-1W,2W,3W,4W, 5W Reported 12-23-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCJMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br />' LIMIT MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 12/04/02 12/04/02 12/04/02 12/04/02 12/04/02 <br /> (ug/L)------ — (ug/L) _ (ug/L) (ug/L) (ug/L) <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 NO 12 170 NO NO <br />' Di-isopropyl Ether (DIPS) 050 NO ND 10 NO NO <br /> Ethyl tert-Butyl Ether (ETBE) 050 ND ND ND ND NO <br />' tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND NO <br /> tent-Butanol(TBA) 20 NO ND 120 ND NO <br />' VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 NO NO 64 NO NO <br />' Ethylene Dibromide (EDB) 050 ND ND ND NO NO <br />' Report Limit Multiplication Factor 1 1 1 1 1 <br /> Report Limit Multiplication Factor for MTBE 5 <br /> "Report limit raised due to matrix interference <br />' Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 946% 897% 893% 912% 103% <br />' Toluene-d8 109% 940% 102% 102% 114% <br /> Instrument ID Varian Saturn 3 MS&MP 5972 MS <br /> Analytes reported as NO were not detected or below the Practical Quantitation Limit <br />' Practical Quantitation Limit=Reporting Limit x Report Limit Mu[tiplication Factor <br /> (pgIL)= micrograms 1 r liter or parts per (ppb) <br />' ANALYST APPROVED BY <br /> Clan J Cone Jqfna U Phillips <br /> boratory Director <br /> 1 <br />