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I treatment systems. However, as a third policy, the RCWD does encourage municipalities to use the Minnesota Pollution Control Agency's Individual Sewage Treatment System Regulations as a model for local control. J I After evaluating water quality within the RCWD through the inventory process as described in Section 3 of this plan, it was evident that there are several areas where water quality data is sparse or nonexistent. The policy of the RCWD is to upgrade this water quality monitoring system to identify potential problems and to develop water resource management strategies and quality improvement projects based on this water quality information. tntimately, the goals outlined in Table 4-2 are hoped to be achieved as a result of the implementation efforts. I One of the more important policies of the RCWD is to insure good water quality to Minneapolis and St. Paul. The St. Paul water system draws some of its water from the RCWD upstream of Centerville Lake. The Minneapolis water system takes most of its water from the Mississippi River a short distance from the confluence of Rice Creek and the Mississippi River. The watershed should be protected to insure that contamination does not reach the St. Paul or Minneapolis systems. I I I I I The District has prioritized lakes on the basis of Trophic State Indices, recreational facilities, and lake capability. Tier 1 lakes consistently support swimming use and are limited to Turtle and White Bear. Tier 2 lakes are Johanna, Josephine, Spring, Clear, Bald Eagle, Moore, Pine Tree, Island, Sunset, Silver, Centerville, and Golden, and are capable of supporting swimming or have significant public uses. Tier 3 includes all DNR protected lakes, wetlands, and watercourses not included in Tiers 1 and 2. Tier 4 represents any remaining wetlands, stormwater basins, and conveyance systems. The classification by tiers will be used to provide for varying retrofit standards, pretreatment, project commitments, and prioritization of resources. II I I I I Objective C: Prevent Flooding and Erosion I The third objective of the RCWD is to prevent flooding and erosion from surface water flows. This two-part objective has five associated policies. I It is the policy of the RCWD that there be no encroachment upon floodways that will reduce capacities to expedite flood flows. It is also the policy of the RCWD to allow only structures 4-4 10/97 I