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In order to provide safe water it may be necessary to require the construction of deeper wells, employ special construction techniques, conduct specialized testing, or require special water treatment procedures. Contractors proposing to drill any well or boring in an advisory area must contact the Minnesota Department of Health, Well Management Section prior to construction. Contractors and property owners must submit a written request and well construction plan to the MDH and must receive written approval before construction, repair, or sealing of a well in the special well and boring construction area.\n\nA Special Well and Boring Construction Area is sometimes also called a well advisory. It is a mechanism which provides for controls on the drilling or alteration of public and private water-supply wells, and monitoring wells in an area where groundwater contamination has, or may, result in risks to the public health. 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"currentVersion": 10.8, "cimVersion": "2.5.0", "id": 12, "name": "Primary Aquifers by Section", "type": "Feature Layer", "description": "County Well Index (CWI) location-verified and interpreted well records were summarized by PLS section. Results show the general distribution of aquifer use in the state. Classification is based on the aquifer code with the greatest frequency in each section; in cases where multiple aquifer codes have the same count, classification between those codes is arbitrary:\n\u2022\tSurficial sand and gravel \u2013 aquifer close to the land surface. Like a sandbox, vulnerable to contamination due to lack of overlying fine-grained material; recharges quickly\n\u2022\tBuried sand and gravel \u2013 aquifer not close to the land surface, less vulnerable to contamination due to presence of overlying \u2013 fine-grained material; recharges slowly\n\u2022\tSandstone bedrock \u2013 aquifer typically not close to the land surface, contamination vulnerability depends on composition and thickness of overlying material\n\u2022\tCarbonate bedrock (limestone) \u2013 aquifer often close to the land surface, contamination vulnerability depends on composition and thickness overlying material. Because carbonate bedrock dissolves over time, water can move quickly over long distances through conduits and caves and is highly vulnerable to contamination in near-surface conditions.\no\tsee areas mapped as karst on GRAPS Pollution Sensitivity of Near-Surface Materials\n\u2022\tCrystalline bedrock \u2013 aquifer often close to the land surface, contamination vulnerability depends on overlying material. The rock itself is relatively impermeable, so water moves through fractures only; wells can have low yields and be vulnerable to contamination.\no\tSee areas in northeastern and southwestern Minnesota mapped as bedrock at or near surface on GRAPS Pollution Sensitivity of Near-Surface Materials\n\u2022\tWeathered material \u2013 aquifer typically not close the land surface, less vulnerable to contamination due to presence of overlying fine-grained material. 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This raster layer was created by calculating the sensitivity at individual wells and then interpolating between them to create a smooth layer. The wells used to make this figure vary in depth but overall provide a picture of the geologic sensitivity of aquifers below the water table. 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