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The Caledonia Argus

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Groundwater Atlas of Houston County released, public workshop offered Feb. 25

The Minnesota Department of Natural Resources recently published “The Groundwater Atlas of Houston County.” The report covers groundwater flow, groundwater chemistry and the pollution sensitivity of aquifers. It also expands on the geologic atlas previously produced by the Minnesota Geological Survey by: Identifying viable drinking water sourcesSupporting sustainabilityGuiding decisions on well and septic system constructionInforming wellhead protection efforts for public water suppliesHighlighting regional recharge and groundwater movementAssessing aquifer pollution sensitivity and possible contaminant migration In Houston County, pollution sensitivity information is especially important because much of the area’s landscape features karst. Karst is a distinctive type of terrain that forms when precipitation and groundwater dissolve underlying carbonate sedimentary rock. Sinkholes, fractures and voids in karst mean water can rapidly move from the surface to underlying aquifers. This increases the risk of common surface pollutants contaminating groundwater in shallow aquifers. Deep aquifers tend to be protected by bedrock layers, which slow the movement of groundwater, resulting in older, more pristine waters. Public workshop The DNR will share details on the Houston County atlas’ contents and its use during a public workshop from 1-4 p.m. Wednesday, Feb. 25. Join in-person in Conference Room EOC at the Houston County Criminal Justice Center in

Houston County, MN · 02-09