Agenda - Council - 05/13/1980 - Laserfiche WebLink

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Page Two TASK 3 TASK 4 TASK 5 ASSESS LOCAL AND REGIONAL HYDROGEOLOGY AT THE LANDFILL SITES - To the extent allowed by the existing data, the local and regional hydrogeological setting at each of the landfill sites will be defined. A clear understanding of the hydrogeological setting is important prior to any determination on the adequacy of the .current monitoring systems. In most cases, it is expected that the local hydrogeological setting has been defined through studies completed by the landfill owners. Where such studies are available they will be utilized as well as other available information on the area from the U.S. Geological Survey, Minnesota Geological Survey and other govermental agencies. Where this data is not available from the landfill owners, data from. the monitoring programs (well logs and water table evaluations) along with hydrogeological information available from other sources will be utilized to define the hydrogeological setting of the landfill. Informational gaps will be identified regarding the hydrogeological setting at each of the landfills. ASSESS ADEQUACY OF MONITORING SYSTEMS - Utilizing the results of Tasks 2 and 3 an assessment will be made as to the adequacy of past and existing monitoring programs at each site for defining the extent and magnitude of leachate migration. An opinion will be offered as to the adequacy of sampling locations and parameters for defining the extent of leachate migration as well as the analytical methods currently utilized in the monitoring programs. IDENTIFY RISKS ASSOCIATED WITH CONTINUING THE EXISTING MONITORING PROGRAMS - In this task an identification will be made of human health and environmental risks associated with the County continuing to rely on .the existing monitoring programs. Such risks will be identified through facility closure and for 20 years into the post-closure period. As input to this identification of risks, a further identification of the location of existing water supply wells as well as the aquifers will be made. An identification of locations where water supply wells are likely to be located around the landfills in the future will also be made. An opinion will be offered as to the adequacy of available .info~mation in identifying risks to surface waters and ground waters from leachate migration.