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1 <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 Pacific Car Wash Sampled 6-26-01 <br /> of Northern Califomis Reference Number 3867 Received 6-28-01 <br />' 837 Shaw Road Sample Description Water Extracted 7-2-01 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 7-2-01 <br /> Attn Tim Cuellar Lab Numbers 3867-6W,7W, 8W,9W, 10W Reported 7-12-01 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW6 MW7 MW8 MW9 MW10A <br />' 062601 062601 062601 062601 062601 <br /> (UnIl ( IL IL ( IL) (pg/L u /L) <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 910 630 21 ND 34 <br /> Di-isopropyl Ether (DIPS) 050 ND ND NO NO NO <br /> Ethyl tent-Butyl Ether (ETRE) 050 ND ND ND NO ND <br /> tent-Amyl Methyl Ether(TAME) 050 ND NO ND ND 056 <br /> tert-Butanof(TBA) 20 ND ND ND ND ND <br /> Report Limit Multiplication Factor 50 50 5 1 1 <br /> Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 109% 106% 993% 999% 110% <br /> Toluene-d8 995% 102% 976% 963% 103% <br /> Instrument ID HP 5972MS <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 /> (Ng/L)= micrograms per liter or parts per billion (ppb) <br /> s <br /> I • ANALYST APPROVED BY <br /> Clan J Cone J s C Phillips <br /> aboratory Director <br />