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0 *iof2 Table 5 Domestic Well Fuel Oxygenates and NitratafNitrite 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/Nitrite as N Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/l) (mgA) (mg/i) DW-1 2/1/2002 <50 <0 50 <0 50 <0 50 <0 50 13 <0 50 42 <0 030 96 2/5/2002 -- -- -- -- -- 16 -- -- -- -- 4/11/2002 — - - -- - -- 7116/2002 ---------------------------—.—...._-----—---------------------Sampled Monthly, Well Head Treatment Ongoing----------------------------------------------------------- 10/2/2002 ------------------------------------------------------------------Sampled Monthly, Well Head Treatment Ongoing------------------------------------------------------------- 1/17/2003 --------------------------_________._.---.......-_-_......Sampled Monthly, Well Head Treatment Ongoing------------------------------------------------------------- 4/3/2003 --------—-----------------_---._-------------------------------Sampled Monthly, Well Head Treatment Ongoing------------------------------------------------------------- 7/22/2003 ---------------------------------------------------------------Sampled Monthly, Well Head Treatment Ongoing---------------------------------------------------------- 10/1/2003 Sampled Monthly; Well Head Treatment Ongoing i DW-2 2!112002 <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 <0 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 — — — 7/22/2003 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 10/2/2003 <20(a) <0 50(a) <0 50(a) <0 50(a) <0 50(a) <0 50(a) <0 50(a) — — — I Projects/ARCO/595/Reports/Tables/gwtables595 As