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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 /> Foothill Engineering Client Project Name:Olivarez Property-Stockton Sampled: 03-23-12 <br /> 8442 Story Ridge Way Lab Reference Number:1203108 Received: 03-26-12 <br /> Antelope,CA 95843 Sample Description:Water Extracted: 03-27-12 <br /> Attn:Mike Vlach Sample Prep/Analysis Method:EPA 5030/8260 Analyzed: 03-27-12 <br /> Lab Numbers:1203108-01,02,03,04,05 Reported: 04-04-12 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GCIMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW-1 MW-IR MW-2 MW-2R MW-3 <br /> {pg1L) (pg/L) (pg/L) (pg/L) {pg/L) (pg/L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 0.50 7.5 ND ND ND ND <br /> Di-isopropyl Ether (DIPE) 0.50 ND ND ND NO ND <br /> Ethyl tert-Butyl Ether {ETRE) 0.50 ND ND NO NO ND <br /> tert-Amyl Methyl Ether(TAME) 0.50 ND ND ND NO ND <br /> tert-Butanol(TBA) 5,0 ND ND ND NO NO <br /> VOLATILE HALOCARBONS&AROMATICS <br /> 1,2-Dichloroethane (1,2-DCA) 0.50 1.4 ND ND ND ILI <br /> Ethylene Dibromide (EDB) 0.50 ND ND NO NO ND <br /> Report Limit Multiplication Factor: I to* 10* 2- <br /> Reporting Limit increased due to matrix intal-fere,17CO <br /> Surrogate Recoveries <br /> 1,2-Dichlomethane-d4 93.9% 94.4% 96.2% 96,5% 99.8% <br /> 96,4% 93,4% 943% 94.9% <br /> Toluene-d8 99,1% <br /> Instrument ID:VARIAN 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) I <br /> APPROVED BY: <br /> James G.Phillips/Laratory Director or <br /> Lahore <br /> oty", <br /> Clan J.Cone Lahore Manager <br /> 78of82 <br />