20260428 15340800 1.0 TRUE Dual Aquifer Layer Dual Aquifer Maquoketa Shale Niagara Dolomite Wisconsin Groundwater Wells This Geographic Information System (GIS) Dual Aquifer/Maquoketa Shale Formation data consists of the best available data that represent boundaries of where the Niagara Dolomite overlies the Maquoketa Shale formation. <DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN>This Geographic Information System (GIS) Dual Aquifer/Maquoketa Shale Formation data consists of the best available data that represent boundaries of where the Niagara Dolomite overlies the Maquoketa Shale formation; it approximates the limits of this boundary based on available information derived from several data sources (WGNHS Bedrock Geologic Map and Silurian Devonian Dolomite GIS dataset) including maps contained in DNR files and hydrogeological information compiled and interpreted by DNR staff.</SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>GIS location data may be used by well drillers and the DNR Drinking Water and Groundwater Program to help identify the general location of the Niagara Dolomite boundary and to assist in planning for the construction of a compliant well under ch. NR 812.14(10), Wis. Adm. Code. GIS locations of this layer should not be solely relied upon to make compliance decisions. The presence or absence of geologic formations should be verified during well construction.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN STYLE="font-weight:bold;">QUALITY ASSURANCE: </SPAN><SPAN>Please be advised that this dataset has not undergone a quality assurance (QA) review. Formation boundaries were digitized based on data sets of varying quality. At the time of the screening, if detailed maps were not available, staff provided an estimate of the general location of the boundary. The QA review process includes verifying whether the boundaries accurately represent the limits of the Maquoketa Shale formation as depicted in available and emerging data and updating it if necessary.</SPAN></P></DIV></DIV></DIV> Wisconsin Department of Natural Resources, Environmental Management Division - Drinking Water and Groundwater Program, Wisconsin Geological and Natural History Survey (WGNHS) <DIV STYLE="text-align:Left;font-size:12pt"><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data is for informational purposes only and may not have been prepared for or be suitable for legal, engineering or surveying purposes. The user is solely responsible for verifying the accuracy of information before using for any purpose. By using this product for any purpose user agrees to be bound by all disclaimers found on the DNR Legal Notices webpage: </SPAN></SPAN><A href="https://dnr.wisconsin.gov/legal" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>https://dnr.wisconsin.gov/legal</SPAN></SPAN></A><SPAN><SPAN>.</SPAN></SPAN></P></DIV>