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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 503018260 Analyzed: 03-27-12 <br /> Lab NumhPr-7 1203108-11,12,13,14,15 Reported- 04-04-12 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW-8D MW-9 MW-10 MW-11 EW-1 <br /> (Ug/L) (pg/L) (pig/L) (pg/L) (pg/L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 0.50 ND ND NO 3,2 NO <br /> Di-isopropyl Ether (RIPE) 0.50 NO NO 1,1 NO NO <br /> Ethyl tort-Butyl Ether (ETRE) 0,50 NO NO NO NO NO <br /> tert-Amyl Methyl Ether(TAME) 0,50 NO NO ND NO NO <br /> tert-Butanol(TBA) 5.0 NO ND 15 NO NO <br /> VOLATILE HALOCARBONS&AROMATICS <br /> 1,2-Dichloroethane (1,2-DCA) 0,50 NO 1.3 7.0 8.6 19 <br /> Ethylene Dibromide (EDB) 0.50 NO NO NO NO NO <br /> Report Limit Multiplication Factor: I 1 1 1 20* <br /> -Re orcin Limit increased due to matrix interference <br /> Surrogate Recoveries <br /> 1,2-Dichlr.Pfh2nP-d4 106% 9lq,3% 962% 94.7% 96.3% <br /> Toluene-d8 97.9% 92.0% 96.7% 93,4% 94.2% <br /> Instrument ID:VARIAN 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 /> APPROVED BY: C.Phill Director or <br /> James i <br /> 1111-aboratory <br /> Clan J.cone aboratory Manager <br /> 80 of 82 <br />