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designs using surface drainage. ve~etation. and infiltration rather than buried pipes and man-made materials and facilities. ' 18.095.2 Storm Water Management S~ecific Standards: 1) Impervious surface coverage of a site shan not exceed 25 percent ofthe site area in a shoreland or wetland overlay distrï'~ unless stonn water is conveyed to an approved, on- site or regional storm water pondWglretention facility designed to accommodate the increased runoff prior to discharge from the site into public waters or wetlands. 2) AIl proposed stonn water facilities shall be reviewed the city engineer and certified for compliance with Roseville's Surface Water Management Plan. 3} All commercial and industrial developments and redevelopments affecting more than 5 acres ofJand and all residential developments affecting more than 20 acres of land shall: a} be served by storm water ponding facilities. on or off site, designed to remove a minimum of90 percent of tot a! suspended solids resulting from the runoffftom a 1 inch rainfall event, and b} within the development. provide for settling chambers, sumps, dry ponds or other devices to provide for the filtering or settling of fine sands prior to discharge into the city's storm water system. 4) AIl private storm water facilities shall be maintained in proper condition consistent with the performance standards for which they were originally designed. All settled materials iTom ponds, sumps, grit chambers, and other devices, including settled solids, shall be removed and properly disposed of on a five year interval. One to five year waivers from this requirement may be granted by the city engineer when the owner presents evidence that the facility has additional capacity to remove settled solids in accordance with the original design capacity. 5) Upon adoption of this chapter, the city engineer shall inventory and maintain a data basis for all private stonn water facilities requiring maintenance to assure compliance with this Section. 26