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106 f. Drive isle width as stated in paragraph (2) (a) shall be approved at the time of <br />107 site plan review. <br />108 <br />109 <br />110 <br />111 <br />112 <br />(3) <br />Curbing required. Pavia areas must be separated with curb and Rutter from all <br />designated landscaping areas, curb islands, and at inress-egress locations to the <br />traveled roadway. Curbin must be constructed of poured -in -place concrete equipped <br />with a gutter and must be of a six inch non -surmountable design. Other curb options <br />may be allowed as approved by the city. <br />113 (4) Paving. Storage areas and access drives for motorized vehicles or motorized <br />114 recreational vehicles must be paved with a continuous impervious surface. except for <br />115 properties where gravel driveways existed prior to the adoption of this ordinance. This <br />116 paving requirement includes the entire parkin area including parkin stalls, aisles and <br />117 driveways based on the following requirements: <br />118 a.All areas shall be surfaced with concrete. bituminous or pavers. <br />119 b.Pervious paving/paver systems may be used provided appropriate soils and site <br />120 conditions exist for the pervious systems to function. The city engineer shall <br />121 make the final determination if soils are conducive for use of pervious <br />122 paving/paver systems. <br />123 1. The use of pervious pavin/paver systems is encouraged for pedestrian <br />124 walkways, parkin areas, overflow parkin areas, snow storage areas, <br />125 within raised medians and islands, emerRencv vehicle lanes and other <br />126 low traffic areas. <br />127 2. The owner shall provide soils information to demonstrate to the <br />128 satisfaction of the city engineer that appropriate conditions exist for the <br />129 pervious paving/paver systems to function and the owner shall enter <br />130 into a maintenance agreement to ensure ongoing maintenance and <br />131 operation of all pervious paving/paver systems. <br />132 <br />133 <br />3. This requirement also applies to open sales lots. open rental lots. and <br />outdoor storage or display areas. <br />134 c.Alternative surface materials may be considered for the rear yard of properties <br />135 located in the B-2. B-3. H-1. or Employment Districts through the issuance of an <br />136 Interim Use Permit. <br />137 <br />138 <br />139 <br />140 <br />(5) <br />Drainage. Driveways shall not exceed a grade of four percent (4%) and all parkin lots <br />except those for less than four (4) vehicles shall include a minimum of a one percent <br />(1%) grade. Catch basins, sumps, and underground storm sewers must be installed if <br />required by the City Engineer. <br />141 (6) Traffic regulatory signs. Stop signs are required at all driveway exits to public <br />142 streets. Other signs may be required as part of the Site Plan Review process. <br />143 <br />144 <br />(7) <br />Stacking. All drive -through service windows must contain room for a minimum stacking <br />of six (6) cars from the serving window and stacking must not extend into drive aisles. <br />145 (8) Demonstrated parking. The City Council may approve a "proof -of -parkin" plan which <br />146 allows for a portion of the required parkin to not be immediately installed, but <br />147 demonstrates that the minimum number of required parkin spaces can be <br />