05-11-1998 Council Packet - Laserfiche WebLink

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provisions set forth in section 3, and the water quantit\’ control provisions set forth in section 4 are required to treat the increase; (3) For projects that result in a net increase in impervious surface of one (1) acre ore more and the total project area is five (5) acres or more, the best management practices provisions set forth in section 3, the water quantity control provisions set forth in settion 4 and the water quality provisions set forth in section 5 of this rule are required to treat the increase; (4) Sidewalks and trails which do not exceed ten (10) feet in width do not require a permit and are not included in any calculation of net increase in impervious surface w hen part of a road or street project. (0 Performance Bond. A performance bond or other surety in a form satisfactory to the District is required for all activity, including Clearing, grading, and e.xcavation, that results in the disturbance of five (5) or more a:res of land. The District will not require a performance bond or other type of surety from cities, townships, municipal corporations, counties, the state or federal government, or agencies of any of the aforementioned. 3. BEST MANAGEMENT PRACTICES REQUIREMENTS. (a) Permanent (Structural and Non-structural). Permanent BMPs consist of structural and non- strucnjral practices. Permanent BMPs must be incorporated in all projects requiring a permit under this rule and must be consistent with specifications of the MPCA manual “Protecting Water Quality in Urban Areas (revised July 1991) and its future revisions. Other permanent BMPs, not addressed in the MPCA manual may be allowed on an experimental basis if their use will generate new and useful data or information regarding effectiveness of the practice. The following table is a summary of the MPCA BMPs and their effectiveness for removal of metals, phosphorus, nitrates, and suspended solids from stormwater, and for controlling rates and volumes of runoff. BMP Typ«EffectWentat of Selected BMPa MeUla Total Phoephorua Dissolved Phosphorus Nitrates Total Suspended Solids Floatablee Runoff Rate Runoff Volume Control Control Structural Infiltration (no overflow)high high high high high high yes yes Dry Detention (24 hr)moderate low low low moderate outlet speafle yes low Oil/gnt separators moderate low no no low yes no no Skimmers no no no no no yes no no Grass stnp/swale moderate low low low moderate low low low Diversions no no no no design speofle no parts)partal Non-atiuctural Vveaands yes yes*yes*yes*yes yes yes partal organic litter management low yes yes yes yes yes no no Street sweeping yes yes yes yes yes no no Drafts April 29,1998