Agenda - Environmental Policy Board - 10/15/2018

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water level is recommended so that data can be collected to correlate against the long term trending patterns within the FIG. Permitting: The increase in demand will subsequently require an amended DNR water appropriations permit. At that time, the DNR is likely to require the collection of the surficial groundwater data mentioned above. In addition, the DNR may require a pumping test to correlate short term temporal relationships between the two aquifers. The design of additional wells can then be based on this information in an effort to mitigate impacts, assuming any exist. Wellhead Protection: The RTC is located directly within the Wellhead Protection Area (WHPA) and Drinking Water Source Management Area (DWSMA) determined by the Ramsey wellhead protection program. Additional groundwater modeling information is included in Appendix H. Any contaminating material that is spilled on the permeable sands within the site can potentially migrate into the groundwater system. Additionally, some net decrease in recharge is expected as the RTC develops and infiltration decreases. Storm water management practices that encourage the infiltration of treated runoff will be part of the design and is discussed in detail in Tasks 17 and 20. Mitigation element. Because the RTC site is within a DWSMA, special precautions are needed to protect groundwater resources. To make sure this occurs, any discharge of runoff into an area dedicated to infiltration will be pre-treated through such practices as particulate settling, vegetative filtration, skimming, installation of compact, sub -grade treatment (ex. catch basin inserts, cyclonic separators, filters), and various types of pre- treatment soil filtering systems. These practices will be routinely maintained and inspected to make sure these pre-treatment practices do not provide a pathway for contamination of groundwater. Areas that are potential major sources of contamination (-hot-spots") will be identified during construction and special precautions added. These areas would include any location where pollutant spills are more likely to occur (service stations, public works/police/fire fueling operations, significant chemical storage). Within WHPAs, the use of conventional underground storage tanks to store anything other than water is restricted. If underground tanks are utilized in these areas they must be double -walled with interstitial sensors and a network of monitoring wells must be installed to assess potential groundwater contamination. In addition, an emergency �cspuiise plan should be developed for the immediate remediation of any spills or leaky tanks. When assembling the issues that were to be addressed as part of this AUAR, it was noted by the Anoka Conservation District and by the DNR that there is a possible connection between the increased demand for municipal groundwater and the observed lowering of wetlands in the vicinity of Municipal Wells 3, 4 and 5. Appendix F was prepared to assess the general magnitude of the problem and the solutions required to address the issue. It is now apparent that the wetlands in question experience natural drying during periods of relative low precipitation. The photographic history included as part of the 13-8