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1 b. Required ground cover. In all zoning districts, all portions of a site not covered by <br /> 2 structures, concrete, or asphalt, but excluding natural areas that are left undisturbed, <br /> 3 shall be finished with sod and plantings, up to the edge of improved streets and other <br /> 4 impervious surfaces. Any alternative to the sod requirement shall require City Council <br /> 5 approval. <br /> 6 (2) Irrigation. If a landscape irrigation system is provided,the system shall be equipped with the <br /> 7 following: <br /> 8 a. Technology that inhibits or interrupts operation of the irrigation system during periods <br /> 9 of sufficient moisture (rain sensor). <br /> 10 b. One or more water efficient technologies. This could include, but is not limited to, <br /> 11 WaterSense labeled weather-based irrigation controllers,soil moisture sensors,and/or <br /> 12 evapotranspiration (ET) sensors. <br /> 13 (3) Existing trees. A reasonable attempt shall be made to preserve as many existing trees as is <br /> 14 practicable and incorporate them into a development (see division 5, Tree Preservation for <br /> 15 inventory and preservation requirements). For each healthy significant tree retained on site <br /> 16 and not identified on the city's list of prohibited trees, one overstory tree, or the equivalent <br /> 17 canopy square footage, can be deducted from the minimum planting requirements. <br /> 18 (4) Planting types. Acceptable planting types shall be determined by the Ramsey Tree Book or, if <br /> 19 not in the Ramsey Tree Book, have approval of the city.The complement of trees fulfilling the <br /> 20 landscaping requirements shall not be less than 25 percent deciduous and not less than 25 <br /> 21 percent coniferous. Not more than 25 percent of the required plantings shall consist of <br /> 22 ornamental or understory trees. Projects should attempt to limit the planting of any one <br /> 23 genus to no more than 20 percent of the total plantings. <br /> 24 (5) Tree stock. Required plantings shall be free of insects, diseases, and mechanical injuries and <br /> 25 shall have a straight trunk and form that is characteristic of the species. <br /> 26 (6) Minimum planting sizes. The minimum planting sizes for all zoning districts shall be: <br /> 27 a. Deciduous overstory tree: 2 inch caliper; <br /> 28 b. Deciduous understory/ornamental tree: 1.5 inch caliper; <br /> 29 C. Coniferous tree and multi-stem deciduous tree: 6 feet in height; and <br /> 30 d. Shrubs: twenty-four (24) inches in height or width, dependent upon growth <br /> 31 characteristics. <br /> 32 (7) Planting requirements for business districts. <br /> 33 a. Business districts(B-1, B-2, and B-3). The minimum number of trees required are <br /> 34 outlined in the table below. These are minimum requirements and can be <br /> 35 supplemented with other plantings, as well as flowers and various ground covers that <br /> 36 would be appropriate to produce a complete and quality landscape. <br /> Planting Type Required Numbers <br /> Deciduous/coniferous trees 1 tree per 50 lineal feet of site perimeter, or 1 <br /> tree per 1,000 square feet of building footprint, <br /> whichever is greater. For building expansions, 1 <br /> additional tree is required for each 1,000 square <br /> feet of new building footprint area. <br /> Shrubs 1 shrub per 30 lineal feet of site perimeter or 1 <br /> shrub per 300 square feet of building footprint <br /> area,whichever is greater. <br /> 37 <br /> 38 b. Industrial districts(1-1 and 1-2). The minimum number of plantings required shall be <br /> 39 determined based on canopy cover.To fulfill the planting requirements, a <br /> Page 86 of 160 <br />