Agenda - Parks and Recreation Commission - 04/10/2014

Home

petroleum are considered higher risks to ground water protection than permanent open spaces, parks, farmland and low-density residential lots. All public water suppliers are required to implement wellhead protection measures. The Minnesota Department of Health (MDH) was granted authority to implement wellhead protection and rules governing wellhead protection were adopted in November of 1997. The City of Ramsey completed a wellhead protection plan in September 2001, which covered wells 1, 2, 3 and 4. Well No. 5 was newly constructed and was not included in the report. A brief summary of the report is below and for more detailed information the reader is referred to the September 2001 report. The City of Ramsey obtains its water from wells located in the Franconia -Ironton - Galesville (FIG) bedrock aquifers, which exhibits confined hydraulic conditions. The wellhead protection areas (WHPAs) for the City wells were delineated using a multi - aquifer groundwater flow model developed for the MDH by a private contractor. The model simulates groundwater flow in the aquifer systems. The model was used to delineate capture zones for all City wells (wells 1 — 4). The drinking water supply management areas (DWSMAs) were determined by overlaying the boundaries of the WHPAs on an aerial photograph and a map showing property parcels boundaries and roadways. The DWSMAs were delineated using these features as boundaries. Two of the City wells are vulnerable and two are not vulnerable. Wells 1 and 2 were classified as not vulnerable because of the presence of geologic protective materials around the wells and the presence of tritium below 1 t.u. in a sample collected from Well No. 1 in 1997. The other two wells are vulnerable because of the presence of tritium in samples collected in 1998. The City wells meet the construction standards of the State Well Code and are not considered a likely avenue for contamination to reach the aquifer from which they pump. 5. Water Supply Infrastructure Needs Currently, the existing Ramsey water supply system is in need of expansion to meet current and future water demands. If the City continues to plan on utilizing groundwater sources, a substantial number of wells will be required. Table 3.4 provides a summary of the wells which would be required. Figure 3.2 graphically depicts the increase in well capacity required to meet the future growth of the system. Currently, three new wells are planned. Minnesota Department City of Ramsey, Minnesota — M21.34343 Page 3-4 Water System Study Prepared by Bolton & Menk, Inc.