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Page 25 of 25 <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 2469 <br /> 1502 North El Dorado Street,Stockton,CA <br /> Ethyl- Total <br /> Sample TOC DTW GWE TPH-g Benzene Toluene benzene Xylenes MTBE TBA EDB 1,2-DCA DIPE ETBE TAME Ethanol Comments <br /> Well ID Date (ft.amsl) (ft) (ft.amsl) (pglL) (pglL) (pg/L) (NgIL) (pg/L) (NgIL) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) <br /> MW-22 03/18/15 12.22 29.93 -17.71 <50 <0.50 <0.50 <0.5D <1.0 4.5 28 <0.50 <0.50 <0.50 <0.50 <0.50 <250 <br /> MW-22 08/28/15 12.22 31.73 -19.51 - - - - - - - - - - - - - <br /> MW-22 03/30/16 12.22 31.05 -18.83 <50 <0.50 <0.50 <0.50 <1.0 2.8 31 <0.50 <0.50 <0.50 <0.50 <0.50 <250 <br /> MW-22 08/29/16 12.22 31.12 -18.90 - - - - - - - - - - - - - <br /> MW-22 03/10/17 12.22 27.27 -15.05 <50 <0.50 <0.50 <0.50 <1.0 2.2 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 <br /> MW-22 08/11/17 12.22 24.95 -12.73 - - - - - - - - - - - - - <br /> MW-22 02/28/18 12.22 23.90 -11.68 <50 <0.50 <0.50 <0.50 0.0 1.5 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 <br /> MW-22 08/31/18 12.22 23.14 -10.92 - - - - - - - - - - - - - <br /> MW-22 03/01/19 12.22 21.59 -9.37 <50 <0.50 <0.50 <0.50 0.0 2.0 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 <br /> MW-22 09/05/19 12.22 19.71 -7.49 - - - - - - - - - - - - - <br /> MW-22 02/28/20 12.22 19.04 -6.B2 <50 <0.50 <0.50 <0.50 <1.0 4.2 <10 <0.50 <0.50 0.28J <0.50 <0.50 <250 <br /> M W-24 02/28/20 11.36 18.26 -6.90 870 73 2.6 2.1 4.1 43 83 <0.50 4.8 <0.50 <0.50 <0.50 <250 <br /> Notes: <br /> M W=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 /> TPH-g=Total petroleum hydrocarbons,gasoline range by LUFT GUMS according to Environmental Protection Agency(EPA)Method 8260E <br /> MTBE=Methyl tert-butyl ether <br /> TBA=Tert-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 11193145(5) <br />