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s Page 1 of 1 Table 6 Domestic Well Fuel Oxygenates and Nitrate/Nitrite Analytical Data ARCO Service Station 11595 6100 N Highway 99,Stockton CA Well Date TBA MtBE DIPE EtBE TAME 1 2-DCA EDS Nitrate as NO3 Nitrite as N Nitrate/Nome as N Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgA) - (mgA) (mgA) DW 1 2/1/2002 <50 <0 50 <0 50 <0 50 <0 50 13 <0 50 42 <0 030 96 2/5/2002 - 1 6 4/11/2002 - -- - - 7/16/2002 - -- --- Sampled Weekly, Well Head Treatment Ongoing- — 10/2l2002 -- - - ----- --- Sampled Weekly Well Head Treatment Ongoing------ -— 1/17/2003 - - -- Sampled Weekly, Well Head Treatment Ongoing -- - —- — — 4/312003 - Sampled Weekly, Well Head Treatment Ongoing --- - DW 2 2/1/2002 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 24 <0 030 54 4/11/2002 <5 0 <0 50 <0 50 <0 50 4 50 <0 50 <0 50 - - - 7/16/2002 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 10/2/2002 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 - - - 1/17/2003 <20 <0 50 <0 50 0 50 <0 50 <0 50 <0 50 - - 4/3/2003 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 - - - Notes TBA=Tart butyl alcohol EDB=Ethylene dibromide ME a Methyl tort butyl ether ppb=parts per billion DIPS=Di isopropyl ether mgA=milligrams per liter ELBE=Ethyl tart bury!ether DW=Domestic Well TAME=Tart amyl methyl ether <=below given laboratory detection limit 12 DCA=1 2 Dichloroethane N=Nitrogen Regulatory Requirements for Nitrates,Nitrites,and Nitrates/Nrtrdes as Nitrogen per San,Joaquin County Department of Health Services Nitrates as NO3 <22 5 mg/l=Annual Monitoring 22 5<45 mg/l=Quarterly Monitoring >1=45 mg/l=MCL,new water source required Nitrites as N <0 5 mg/I=Sample every three years 0 5>1 0 mgA=Quarterly Monitoring >/=1 0 mgA=MCL,new water source required i Nitrates/Nitntes as N <5 mgA=Sample every three years 5>10 mg/l=Quarterly Monitoring >/=10 mg/l=MCL new water souros required 1 ProjeoWARCO/595Ageports/Tableslgwtables595 As