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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 06-05-02 <br />' of Northern California Reference Number 4758 Received 06-07-02 <br /> 837 Shaw Road Sample Description Water Extracted 06-07-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 06-07-02 <br /> Attn Tim Cuellar Lab Numbers 4758-16W, 17W, 18W Reported 06-17-02 <br /> I <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT VW 1 C VW 3A VW 2A <br />' 060502 060502 060502 <br /> (pg/L) u IL) (ug/L (u IL) <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 51 18 510 <br /> Di-isopropyl Ether (DIPE) 050 ND ND ND <br />' Ethyl tert-Butyl Ether (ETRE) 050 ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 0 50 ND ND ND <br />' • tert-Butanol(TBA) 20 ND ND ND <br />' VOLATILE HALOCARBONS <br /> 1 2-Dichtoroethane (1,2-DCA) 050 92 ND 190 <br />' Ethylene Dibromide (EDB) 050 64 ND ND <br />' Report Limit Multiplication Factor 100" 10` 100* <br />' Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 91 6% 758% 728% <br /> Toiuene-d8 997% 935% 915% <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 />' (dig/L)= micrograms per liter or parts r bill n ppb) <br />' ANALYST APPROVED BY <br /> Clam J Cone J e M ips <br /> aboratory Director <br /> 1 <br />