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t <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br />' Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Sampled See Below <br />' of Northern California Reference Number 3849 Received 6-22-01 <br /> 837 Shaw Road Sample Description Water Extracted 6-28-01 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 6-28-01 <br /> Attn Tim Cuellar Lab Numbers 3849-11 W 12W, 13W 14W, 15W Reported 7-5-01 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW13 MW2 XV1A J%VV1B #JW2A <br />' 062001 062101 062101 062101 062101 <br /> (pg1L) /L /L /L /L) /L <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND ND ND ND ND <br /> Di-isopropyl Ether (DIPE) 050 ND ND ND ND ND <br />' Ethyl tert-Butyl Ether (ETBE) 050 ND ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND ND <br />' tert-Butanol (TBA) 20 ND ND ND ND ND <br />' VOLATILE HALOCARBONS <br /> 1 2-Dichloroethane (1,2-DCA) 050 ND 14 ND ND ND <br /> Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br />' Report Limit Multiplication Factor 1 1 500' 20* 50* <br /> Date Sampled 6-20-01 6-21-01 6-21-01 6-21-01 6-21-01 <br /> 1 <br /> * Increased reoortina limit due to matrix interferences <br /> Surrogate Recoveries <br /> t 1 2-Dichlaroethane-d4 104% 821% 825% 918% 933% <br /> Toluene-d8 110% 961% 902% 949% 990% <br /> Instrument ID HP 5972MS <br /> Anaiytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit= Reporting Limit x Report Limit Multiplication Factor <br /> (pg/L)= micrograms per liter or partsjWj btllion(ppb) <br /> 1 ANALYST APPROVED BY <br /> Clary J Cone J e C Phillips <br />' 11raboratory Director <br />