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Published byTheodore Stanley Modified over 8 years ago
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The Dane County Regional Hydrologic Study
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Conceptualized groundwater flow system for Dane County Source: Bradbury and others, 1999.
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Recommendations : Alternative pumping strategies Maximizing infiltration Water conservation Analyzing impacts of proposed wells on sensitive resource areas Innovative measures (e.g., treating wastewater as a resource)
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Primary Groundwater Quality Problems in Dane County Nitrates and Bacteria Pesticides Volatile Organic Compounds (VOCs)
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Zones of Contribution Dane County Proposed 2020 Pumping Rates
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Naturally Vulnerable Areas Locate pollution sources outside these areas Require special conditions or controls Potential Problem Areas Existing pollution source areas which threaten drinking water supplies
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Elevated Nitrate Levels: Over-fertilization (in excess of crop uptake) Manure Storage Failing Septic Systems Clusters of On-Site Systems (rural subdivisions)
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Agriculture: Improved design/construction of manure storage facilities Proper abandonment of manure storage pits Nutrient management planning (to reduce over-fertilization)
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Residential On-Site Systems: Triennial inspection and maintenance Evaluate the impact of clusters of on-site systems (rural subdivisions) Replace failing systems Information and Education
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Pesticides: Increased monitoring - especially extreme risk areas Promote alternatives to pesticides - such as Integrated Pest Management
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Landfills: More monitoring of closed landfills (esp. extreme risk areas and well protection zones) Locate future sites outside these areas Continued support of recycling, waste- reduction and hazardous waste programs
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Above Ground Storage Tanks Less of a problem However, information gaps for fuel/chemical tanks (<1,000 gals.) Greater emphasis on proper storage of fuel, pesticides and fertilizers is needed
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Land Application of Septage: County oversight/responsibility for approval of land spreading sites Sites should be carefully designed and located outside extreme risk areas and well protection zones More authorized discharge points at municipal treatment plants
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Summary: All Significant Land Use and Siting Decisions Should Include an Evaluation of the Potential Groundwater and Hydrologic Impacts: Locate pollution sources away from high/extreme risk areas Locate wells where they will be adequately protected Pursue various management programs to reduce the risk of contaminating drinking water supplies
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