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Page 35 of 35 <br /> Table 1 <br /> Historical Groundwater Gauging and Analytical Results <br /> Union Oil Company of California <br /> Former 76 Station No.4409/Phillips 66 Site 5862 <br /> 1502 North El Dorado Street,Stockton,CA <br /> Ethyl- Total <br /> Sample TOC DTW GWE TPHg Benzene Toluene benzene Xylenes MTBE TBA EDB 1,2-DCA DIPE ETBE TAME Ethanol <br /> Well ID Date (ft.amsl) (ft) (ft.amsl) (Ng/L) (pg/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) <br /> MW-25 02/05/21 11.15 20.50 -9.36 -- -- -- -- -- -- -- -- -- -- -- -- -- <br /> MW-25 12/30/21 11.15 21.10 -9.95 50 <0.50 <1.0 <1.0 <2.0 <1.0 <10 <1.0 0.88 <2.0 <2.0 <2.0 <100 <br /> MW-25 06/30/21 11.15 22.13 -10.98 160 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 1.1 <0.50 <0.50 <0.50 <250 <br /> MW-25 09/01/21 11.15 21.32 -10.17 <50 <0.50 <1.0 <1.0 <2.0 <1.0 <10 <1.0 1.1 <2.0 <2.0 <2.0 <100 <br /> MW-25 12/30/21 11.15 21.1 -9.95 50 <0.50 <1.0 <1.0 <2.0 <1.0 <10 <1.0 0.88 <2.0 <2.0 <2.0 <100 <br /> MW-25 03/09/22 11.15 20.76 -9.61 <50 <0.50 <1.0 <1.0 <2.0 <1.0 <10 <1.0 0.75 <2.0 <2.0 <2.0 <100 <br /> MW-25 09/26/22 11.15 22.88 -11.73 74 <0.50 <1.0 <1.0 <2.0 <1.0 <10 <1.0 0.98 <2.0 <2.0 <2.0 <100 <br /> Notes: <br /> MW=Groundwater monitoring well <br /> TOC=Top of casing <br /> DTW=Depth to groundwater <br /> GWE=Groundwater elevation <br /> ft amsl=Feet above mean sea level <br /> ft=Feet <br /> pg/L=Micrograms per liter <br /> Bold= Value exceeds laboratory reporting limits <br /> <0.50=Not detected at or above the stated limit <br /> --=Not sampled/not measured <br /> J=Estimated value;concentration >_method detection limit but<practical quantitation limit <br /> TPHg=Total petroleum hydrocarbons,gasoline range by LUFT GC/MS according to Environmental Protection Agency(EPA)Method 8260B <br /> MTBE=Methyl tert-butyl ether <br /> TBA=Ter[-butanol or tertiary butyl alcohol <br /> EDB=1,2-Dibromoethane <br /> 1,2-DCA=1,2-Dichloroethane <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tert-butyl ether <br /> TAME=Tert-amyl methyl ether <br /> a=TPH does not exhibit a"gasoline"pattern. TPH is entirely due to MTBE. <br /> b=Chromatogram not typical of gasoline <br /> c=Detection and quantitation limits are raised due to sample dilution. <br /> GHD 12594700(1) <br />