Pollutant transport in a shallow unconfined aquifer in Perry,Ohio |
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| Authors: | J Mark Inglis Gerald Matisoff Walton Ross Kelly |
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| Institution: | (1) Rm. 404, Chevron Production 3520 Gen Charles DeGaulle Dr, 70114 New Orleans, Louisiana;(2) Department of Geological Sciences, Case Western Reserve University, 44106 Cleveland, Ohio;(3) U S. Nuclear Regulatory Commission, Mail Stop 623 SS, 20555 Washington, D C.;(4) Present address: Chevron USA, Inc., 5200 Stockade Highway, 93302 Bakersfield, California |
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| Abstract: | The groundwater system in northern Perry Township in Lake County, Ohio, is a shallow, unconfined aquifer consisting of periglacial
lake beach deposits and less permeable lacustrine plain deposits. Groundwater flow is generally toward Lake Erie from south
to north and is controlled by the top of the Ashtabula Till, but strong, local variations are caused by northward flowing
streams During the study period, water levels in most wells exhibited a seasonal fluctuation of less than 0 3 m from their
mean values. The areal distributions of chloride and nitrate concentrations indicate that road salt runoff easily infiltrates
the aquifer and that nitrate may be sourced from fertilizer application. Ground-water flow and solute transport models indicate
that in excess of 27 years are required to obtain chemical steady-state under hydrologic steady-state conditions. The simulations
also demonstrate that nitrate loading must occur in more than one cultivated field in order to obtain the observed wide-spread
nitrate distribution. |
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