05-11-1998 Council Packet - Laserfiche WebLink

Home Browse Search

r Q}____For protects that result in a net increase in impervious surface of one (I) acre or more, but the total proiect are a is less than five (5) acres, the best management practices provisions set forth in section 3, and the water quantity control provisions set forth in section 4 are required to treat the increase: (3) For protects that result in a net increase in impervious surface of one f H acre ore more and the tot al proiect area is five (S) acres or more, the best management practices provisio ns set forth in section 3. the water quantity control provisions set forth in section 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 flO') feet in width do not require a permit and are not included in anv calculation of net increase in impervious surface when 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 excavation, that results in the disturbance of ten-(10) five (S3 or more acres 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 anv of the aforementioned. 3. BEST MANAGENtENT PRACTICES REQUIREMENTS. DECISION CRtTEMA FOR EROSION CONTROL PL»\NS. Erosion Control Pla ns shall -comp ly-with-the following orit erio: (a) Permanent (Structural and Non-stnicturaD. Permanent BMPs consist of structural and non- structural practices. Permanent BNfPs 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 111 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 Tvd«Erractivtnaaa of Salactad BMPt MatJit Tout Phofphorut Ditsolvad Photphomt NItratat Total Suepandad Soll^Floatablaa Runoff Rata Runoff Volume Control Control Stmctunt Infiltration (no overttow)high high high high high high yaa yes Dry Oeienoon (24 nr)modaraia kym low low modarata ouM spactflc yaa low Oil/gnt saparators mooerata low no no low yes no no Skimmafs no no no no no yea no no Grass strp/swata mooarata tow low low modarata low low low Diversions no no no no dasgn spaoflc no partial partial Non-fltructural Draft ~ April 29, 1998