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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 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 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04-09-03 <br /> Attn Tim Cuellar Lab Numbers 5632-16W, 17W, 18W, 19W Reported 04-18-03 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT AW 1A AW 1 B AW 2A AW 2B <br /> 040403 040403 040403 040403 <br /> (pg/L) u IL (ug/L u IL) u /L <br /> FUEL-OXYGENATES <br /> IMethyl tert-Butyl Ether(MTBE) 050 ND ND ND ND <br /> Di-isopropyl Ether (DIPE) 050 ND ND ND ND <br /> Ethyl tert-Butyl Ether (ETRE) 050 ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND <br /> i• tert-Butanol(TBA) 20 ND ND ND ND <br /> VOLATILE HALOCARBONS <br /> 1 2-Dichloroethane (1,2-DCA) 050 ND ND 0 83 ND <br /> Ethylene Dibromde (EDS) 1110 ND ND ND ND <br /> Report Limit Multiplication Factor 20* 20* 1 1 <br /> I <br />' Report limit raised due to matrix interference <br /> Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 584% 628% 928% 103% <br /> Toluene-d8 670% 698% 104% 953% <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= Reporting 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 Jame Phi!lrps <br />' Lab story Director <br /> I <br />