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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 Pacific Car Wash Sampled 08-14-02 <br />' of Northern California Reference Number 4974 Received 08-15-02 <br /> 837 Shaw Road Sample Description Water Extracted 08-18-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 08-18-02 <br /> Attn Tim Cuellar Lab Numbers 4974-1W,2W,3W,4W, 5W Reported 08-28-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <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 />' 08-14-02 08-14-02 08-14-02 D8-14-02 08-14-02 <br /> (uo/L) (u IL) u /L)( (ug/L (ug/L u /L) <br /> FUELO YGE ATE <br />' Methyl tert-Butyl Ether(MTBE) 050 280 13 19 NO ND <br /> Di-isopropyl Ether (DIPE) 050 94 NO NO NO NO <br /> Ethyl tert-Butyl Ether (ETBE) 050 NO NO NO NO NO <br /> tert-Amyl Methyl Ether(TAME) 050 45 NO NO ND NO <br />'S tert-Butanol(TBA) 20 NO NO NO ND NO <br /> VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (12-DCA) 050 110 NO ND ND NO <br /> Ethylene Dibromide (EDB) 050 NO NO ND NO NO <br /> Report Limit Multiplication Factor 5` 10' 10" 1 1 <br /> Report Limit Multiplication Factor for MTBE only 25 <br /> Report limit raised due to matrix interference <br /> Surrogate Recoveries <br /> I 1 2-Dichloroethene-d4 664% 738% 938% 849% 907% <br /> Toluene-d8 977% 100% 110% 824% 998% <br /> Instrument ID Varian Saturn 3 MS <br /> Analytes reported as NO 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 /> I ANALYST — 6& if <br /> APPROVED BY <br /> Clan J Cone J& es hr rps <br /> Iboratory Director <br />