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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 />Well ID <br />Sample <br />Date <br />TOC <br />(ft. amsl) <br />DTW <br />(ft) <br />GWE <br />(ft. amsl) <br />TPH-g <br />(pg/L) <br />Benzene <br />(pg/L) <br />Toluene <br />(pg/L) <br />Ethyl- <br />benzene <br />(pg/L) <br />Total <br />Xylenes <br />(pg/L) <br />MTBE <br />(pg/L) <br />TEA <br />(pg/L) <br />EDB <br />(pg/L) <br />1,2-DCA <br />(pg/L) <br />DIPE <br />(pg/L) <br />ETBE <br />(pg/L) <br />TAME <br />(pg/L) <br />Ethanol Comments <br />(pg/L) <br />MW-22 03/18/15 12.22 29.93 -17.71 <50 <0.50 <0.50 <0.50 <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 <1.0 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 <1.0 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 -6.82 <50 <0.50 <0.50 <0.50 <1.0 4.2 <10 <0.50 <0.50 0.28J <0.50 <0.50 <250 <br />MW-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 />MW= Groundwater monitoring well <br />TOC = Top of casing <br />DTW = Depth to groundwater <br />GVVE = Groundwater elevation <br />ft ems' = 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 GC/MS according to Environmental Protection Agency (EPA) Method 8260B <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)