Laserfiche WebLink
• The relative amount of time it takes for spills or infiltrating stormwater to reach bedrock aquifers. <br />Blue areas take more than fifty years; yellow areas take less than 50 years; white areas have <br />insufficient data to evaluate <br />Figure 23. Characteristics of land and geologic features to be considered in protection and management efforts. <br />• Karst Features <br />Special Well and Boring <br />Construction Area <br />Vulnerable Drinking <br />Water Supply <br />Management Area for <br />Groundwater <br />Vulnerable Drinking <br />water Supply <br />Management Area for <br />Surface Water Supply <br />Outside of DWSMAs, <br />Travel Time to Bedrock <br />Less than 50 years <br />More than 50 years <br />Discharge from <br />bedrock, or insufficient <br />data to determine <br />r ETROE'NOLITAN <br />C <br />Contamination issues vary throughout the region, primarily driven by differences in hydrogeologic <br />setting and in level of development. The most cost-effective way to address contamination is usually <br />to prevent it through source water protection. <br />Uncertainty regarding aquifer productivity and extent <br />Parts of the region have limited information about aquifer productivity and extent. There is local and <br />regional benefit in filling these information gaps. Partners such as the Minnesota Department of <br />Natural Resource, the U.G. Geological Survey, the Minnesota Department of Health, communities and <br />others have an important role to play in directing resources to install monitoring wells, update geologic <br />atlases, and conduct aquifer tests. <br />The following are some indicators of increased uncertainty regarding water supply source <br />sustainability: <br />• No aquifer test in the supply aquifer has been performed within 1.5 miles of the community <br />• No long-term observation well data available for areas within one mile of the community <br />WATER SUPPLY MASTER <br />PLAN- Draft June 2015 <br />51 <br />