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r, r-119 r-? r"!! F--t r-7 r_" r77 r--" r r7". Ems" r--7 r-IT. r-! 1 <br /> As <br /> Mass Calculations -Groundwater <br /> J <br /> Groundwater <br /> Analyte Interval ft3 (28.3 00) (Cone ug1L) 10-8/ug n Value in(kg) Value in lbs <br /> MTBE 1-10 13,711 28.31 2.6 0.000000001 0.30 0.800 0.001 <br /> Note <br /> Area of horizontal extent based on 2010 Q1 isoconcenlration map.Horizontal extent approximates the shape of an elipse with awes approximately 26 and 43 feet <br /> in length. � <br /> Average depth to water table since January 2008 is assumed to be 50.5 feet. <br /> Plume thickness is assumed to be 14.5 feet based on average depth to groundwater of 50.5 feet and total depth of monitoring wells of 65 feet. <br /> Average MTBE concentration of 2.6 pg/L is based on 2019 Q1 data associated wth MWI,MW2,and MW3. <br />