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b. Topsoil. All exposed ground areas of a site not occupied by building, parking or storage, <br />excluding natural areas that are left undisturbed, shall be covered with four inches of topsoil, <br />as defined in section 117-1, or an approved alternative as referenced in section 117-348 <br />c. Sodding and ground cover. All areas not otherwise improved in accordance with approved <br />site plans shall be finished with sod up to the edge of improved streets. Any alternative to <br />the sod requirement shall require city council approval. <br />d. Irrigation. <br />1. All landscaping areas required under this section shall include underground irrigation <br />systems. <br />2. Exceptions include natural areas that are left undisturbed. <br />e. Parking lot landscaping. All parking lots are required to provide internal overstory tree <br />plantings in an effort to shade parking surfaces and provide visual relief. Plantings are <br />required at the following minimum schedule. The planting schedule is established to provide <br />an acceptable number of plantings that may be planted in regular symmetrical patterns or <br />irregular clusters or groupings. <br />1. 1 tree per every ten parking spaces. <br />2. Every overstory tree planting shall be provided with a planting area of 162 square feet. <br />3. Acceptable ground cover materials include sod, mulch, and other natural ground cover. <br />Landscaping rock and plastic underlayment is not allowed. <br />4. All parking lot planting areas shall include underground irrigation systems. <br />f. Bufferyards. This section is intended to be minimum requirements to achieve screening <br />between differing uses with varied intensities and impacts that are not always <br />complementary when adjacent to one another. When a bufferyard is required under this <br />section, the yard space and planting requirements are not to be reduced for other purposes <br />such as future parking and driveways, building expansions, or other activities that are not in <br />keeping with the purposes of buffering and screening. <br />1. Bufferyards are intended to provide additional screening of businesses that are adjacent <br />to residential areas. The following table details the width of the bufferyard along the <br />common adjacent property line. An additional increase of landscape plantings would be <br />required in the bufferyard. That increase is expressed in the table below as a <br />percentage of the total required site landscaping <br />Existing Adjacent Development <br />Proposed Development <br />R-1 <br />R-2 <br />R-3 <br />B-1 <br />Bufferyard width <br />increase in plantings required <br />40 ft. <br />30 ft. <br />20 ft. <br />25% <br />20% <br />20% <br />B-2 <br />Bufferyard width <br />increase in plantings required <br />50 ft. <br />40 ft. <br />30 ft. <br />30% <br />25% <br />20% <br />