TAILIEUCHUNG - GROUND WATER POLLUTION POTENTIAL OF MAHONING COUNTY, OHIO

Most of the concern about mercury focuses on lakes and other aquatic ecosystems, such as rivers, streams, wetlands and oceans. The levels of mercury found in terrestrial environments are usually not high enough to threaten the health of wildlife and humans. But some aquatic environments favour the transformation of mercury into its more poisonous form — methylmercury — and it is the bioac- cumulation of methylmercury in fish and marine mammals that presents a potential problem when they are consumed by humans. In addition to human health effects, many predatory species of fish and wildlife, which rely on fish for food, are at risk of mercury. | GROUND WATER POLLUTION POTENTIAL OF MAHONING COUNTY OHIO BY MICHAEL P. ANGLE GROUND WATER POLLUTION POTENTIAL REPORT NO. 51 OHIO DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER WATER RESOURCES SECTION 2003 ABSTRACT A ground water pollution potential map of Mahoning County has been prepared using the DRASTIC mapping process. The DRASTIC system consists of two major elements the designation of mappable units termed hydrogeologic settings and the superposition of a relative rating system for pollution potential. Hydrogeologic settings form the basis of the system and incorporate the major hydrogeologic factors that affect and control ground water movement and occurrence including depth to water net recharge aquifer media soil media topography impact of the vadose zone media and hydraulic conductivity of the aquifer. These factors which form the acronym DRASTIC are incorporated into a relative ranking scheme that uses a combination of weights and ratings to produce a numerical value called the ground water pollution potential index. Hydrogeologic settings are combined with the pollution potential indexes to create units that can be graphically displayed on a map. Ground water pollution potential analysis in Mahoning County resulted in a map with symbols and colors that illustrate areas of varying ground water contamination vulnerability. Eight hydrogeologic settings were identified in Mahoning County with computed ground water pollution potential indexes ranging from 76 to 168. Mahoning County lies within the Glaciated Central hydrogeologic setting. Varying thicknesses of glacial till overlies Mahoning County. The county is crossed by numerous primarily north-south trending buried valleys. The buried valleys are variable. Some contain appreciable thicknesses of outwash sand and gravel others are predominantly filled with fine-grained glacial till. Outside of the buried valleys aquifers within glacial deposits are limited to thin lenses interbedded in glacial till. .

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