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<br />2) Development shall be planned and conducted in a manner that will minimize the extent of
<br />disturbed areas, runoff velocities, erosion potential, and reduce and delay runoff volumes.
<br />Disturbed areas shall be stabilized and protected as soon as possible and facilities or
<br />methods used to retain sediment on the site.
<br />
<br />3) When development density, topographic features, and soil and vegetation conditions are
<br />not sufficient to adequately handle stormwater runoff using natural features and
<br />vegetation, various types of constructed facilities such as diversions, settling basins,
<br />skimming devices, dikes, waterways, and ponds may be used. Preference shall be given to
<br />designs using surface drainage, vegetation, and infiltration rather than buried pipes and
<br />man-made materials and facilities.
<br />
<br />18.095.2 Storm Water Management Specific Standards:
<br />
<br />1) Impervious surface coverage ofa site shall not exceed 2S percent of the site area in a
<br />shoreland or wetland overlay district unless storm water is conveyed to an approved, on-
<br />site or regional storm water pondinglretention facility designed to accommodate the
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<br />.......I-"'........Q-¡;;t........... J..........LV.l.L .Pl....v... '"'" """.I.t.Jv...I.........E)"'" .&.1.'-'.1...... Lo"'''''' 01......, .1.1.1.,,'\.1 y"""'v....-...,.; "y"'..."'..~.......1.
<br /> ..y"'"".I."".......I.JI.
<br />
<br />2) All proposed storm water facilities shall be reviewed the city engineer and certified for
<br />compliance with Roseville's Surface Water Management Plan.
<br />
<br />3) All commercial and industrial developments and redevelopments affecting more than 5
<br />acres ofland and all residential developments affecting more than 20 acres ofland shall:
<br />
<br />a) be served by storm water ponding facilities, on or off site, designed to remove a
<br />minimum of90 percent of total suspended solids resulting from the runoffftom a 1
<br />inch rainfaJ1 event, and
<br />
<br />b) within the development, provide for settIíng chambers, sumps, dry ponds or other
<br />devices to provide for the filtering or settling of fine sands prior to discharge into
<br />the city's storm water system.
<br />
<br />4) Âli private storm water faciiities shaH be maintained in proper condition consistent with
<br />the performance standards for which they were originally designed. All settled materials
<br />rrom ponds, sumps, grit chambers, and other devices, including settled solids, shall be
<br />removed and properly disposed of on a five year interval. One to five year waivers from
<br />this requirement may be granted by the city engineer when the owner presents evidence
<br />that the facility has additional capacity to remove settled solids in accordance with the
<br />original design capacity,
<br />
<br />5) Upon adoption of this chapter, the city engineer shall inventory and maintain a data basis
<br />for all private storm water facilities reqwring maintenance to assure compliance with this
<br />Section.
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