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' CASTLE ANALYTICAL <br /> LABORATQRY <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 Station Sampled 06-04-03 <br />' of Northern California Reference Number 5793 Received 06-10-03 <br /> 837 Shaw Road Sample Description Water Extracted 06-13-03 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 06-13-03 <br /> Attn Tim Cuellar Lab Numbers 5793-11W, 12W, 13W, 14W, 15W Reported 06-18-03 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GUMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW-7C MW-7D MW-7E VW-1 C VW-2A <br /> 060403 060403 060403 060403 060403 <br /> (ua/L) u /L u /L u IL) (ug/L u /L <br /> FUEL OXYGENATES <br /> Methyl Cert-Butyl Ether(MTBE) 050 ND ND ND 60 390 <br /> Di-isopropyl Ether (DIPS) 150 ND ND ND ND NO <br /> Ethyl tent-Butyl Ether (ETRE) 050 NO ND ND ND NO <br /> Itert-Amyl Methyl Ether(TAME) 050 NO ND ND ND ND <br /> • tert-Butanol(TBA) 20 NO ND ND NO ND <br /> VOLATILE HALOCARSONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 082 ND NO 74 170 <br /> Ethylene Dibromide (EDB) 050 ND ND ND ND NO <br /> Report Limit Multiplication Factor 1 1 1 100' 100' <br /> I <br /> I "Report limit raised due to matnx interference <br /> Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 819% 881% 963% 903% 913% <br /> Toluene-d8 103% 106% 104% 105% 107% <br /> Instrument ID 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 parts per billion(ppb) <br /> ANALYST APPROVED BY A1 <br /> Clary J ane J hllllps <br /> aporatory Director <br />