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Page 1 of 2 Table 6 Domestic Well fuel Oxygenates and Nitrate/Nitrite Analytical Data ARCO Service Station#595 6100 N Highway 99,Stockton,CA Well Date TBA MtBE DIPE EtBE TAME 1,2-DCA EDB Nitrate as NO3 Nitrite as N Nitrate/Nitnte as N Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgA) (mgA) (mg/1) DW-1 211102 <50 <0 50 <0 50 <0 50 <0 50 13 <0 50 42 <0 030 96 215102 -- – – – – 16 – -- -- _ 4111102 -- 7/16/02 Sampled Weekly, Well Head Treatment Ongoing 10202 Sampled Weekly, Well Head Treatment Ongoing 1117103 Sampled Weekly, Well Head Treatment Ongoing _ 4/3103 Sampled Weekly, Well Head Treatment Ongoing — --_ 07-2203 Sampled Weekly, Well Head Treatment Ongoing--- DW-2 —DW-2 211102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 24 <0 030 54 4111102 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- -- 7116/02 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- .. _ 1012!02 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- .. _ 1117103 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 .- .. _ 413103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 _ -- _ 7122103 <20 <0 50 <0 50 <0 50 0 50 <0 50 <0 50 Notes TBA=Tert-butyl alcohol EDB=Ethylene dibromide MtBE=Methyl tert-butyl ether ppb=parts per billion DIPE=DHsopropyt ether mg/l=milligrams per liter EtBE=Ethyl tert-butyl ether DW W Domestic Well TAME=Tert-amyl methyl ether <=below given laboratory detection limit 1,2-DCA=1,2-Dichlorcethane N=Nitrogen Regulatory Requirements for Nitrates,Nantes,and Nitrates/Nitnles as Nitrogen per San Joaquin County Department of Health Services Nitrates as NO3 <22 5 mgA=Annual Monitoring 22 5<45 mgA=Quarterly Monitoring >/=45 mgA=MCL,new water source required Nitrites as N <0 5 mgA=Sample every three years 0 5>1 0 mg/l=Quarterly Monitoring >/=1 0 mgA=MCL new water source required NdratestNitntes as N Prclects/ARCO/595/ReporWrablestgwtables595 xls