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Figure 20-Historic Maximum Site Groundwater Surface Elevations and Maximum Concentrations for BTEX in <br /> Groundwater for Monitoring Events from 1994 to 2013 -10 <br /> 25 <br /> -15 <br /> 20 est Hls,.,I untlwatet Level -20 <br /> N <br /> E <br /> -25 w • <br /> C <br /> O <br /> 15 -30 > <br /> m v <br /> w <br /> C V <br /> O � <br /> -35 <br /> 3 <br /> C <br /> Ol `y <br /> V <br /> o 10 <br /> U3 <br /> -40 -o <br /> TimetoMeet Established PrimaryMCLs too <br /> Esti __ for Site Petroleum Hydrocarbons in Groundwate <br /> rpated Atte ��� Estimated at 12 to 15 years(2029) -45 <br /> ate ofiPH n eGU�5 S r <br /> water for BTEX -50 <br /> 1 <br /> 'Level <br /> -55 <br /> 0 Ol N W W W W I j W N N N N N N N N N N <br /> W W sD tD t0 W W W 00 W J V <br /> t\D \ <br /> O D O O O O O O O N N W <br /> m tp p0 N W A N Ol J W <br /> -60 <br /> Estimated Historic Base of Groundwater Petroleum Hydrocarbon Mass <br /> +Benzene tToluene —�—Xylene teEthylbenzenetGroundwaterSurface Elevation <br />