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&'. ."'.' a 5. ,. this criterion ..y be recommended by the Roseville Development Review Committee as follows: 1. "eding of future expansion areas as shown on approved plans. 2 . Undi.turbed areas containing existing viable natural vegetation which can be maintained free of foreign and noxious plant materials. 3. Areas designated .s open .pace or future expan.ion areas properly planted .nd maintained with prairie gr.... 4. Use of mulch materials such as rock or wood chips in support of .hrubs and foundation plantings. Slo-o~ and Barms 1. Final slope grades ste.per than the ratio of 3:1 will not be permitted without special landscaping treatment such as terracing, retaining walls, or ground covers. 2. Berming used to provide required screening of parking lots and other open areas shall have a maximum slope ratio of 3:1. Woodland Preservation policv and Credit 1. Credit for the retention of existing trees which are of acceptable species, size and location may be given' to .atisfy the minimum number requirements set forth in this Ordinance. .. parkina Lot Landsc&-oina 1. Parking lots ot.50 or more spaces are required .to h~ve 150 .quare 'feet of landscaped islands per 25 _parking spaces. One overstory or evergreen tree is required for every 150 .quare feet of interior landscaped .rea. The minimum width of landscape islands i. 6 feet and the minimum area is 150 .quare feet. 2. One ornamental, overstoryor evergreen tree is required for every 50 feet of parking lot frontage. I .. 3. Front yard setbacks sball have a screen that is 80 percent opaque and a height of 2-1/2 feet. The screen may be: 1) plant materials, . ::- :."