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22 <br />shall have a dust-free surface, or shall be water surface, provided that not less than <br />10 percent of the required group usable open space at ground level shall be <br />landscaped with trees and other plant materials suitable for ornamentation. No <br />required usable open space shall be located in a parking area, driveway, service <br />area, or required front yard, or shall have a slope greater than 10 percent. <br />18.84.220 Screening of open uses. <br />A use not conducted within a completely enclosed structure shall have screening of a <br />height specified by the zoning administrator if located in an I-P district or in a C or I <br />district adjoining or opposite across a street or alley from an R district or if located in C- <br />S or I district adjoining or opposite across a street from an O, C-N, C-C, MU, C-R or P <br />district, unless the zoning administrator finds that topographic or other physical <br />conditions or the characteristics of the use make screening unnecessary or ineffective <br />for protection of the adjoining or opposite district. <br />18.84.230 Landscaping of parking facilities. <br />In an O, C-N, C-C, MU, I-P, or P district, not less than five percent of the area with a line <br />drawn around the outer edges of the area occupied by vehicles shall be landscaped <br />with trees and other plant materials suitable for ornamentation. Landscaped areas shall <br />be distributed throughout the parking area. In addition, a landscaped area not less than <br />five feet in depth shall be located at the property lines adjoining the street frontages of <br />the site except for necessary drives and walks. <br />Resolution PC-2019-15