01/25/2011 Env Bd Packet - Laserfiche WebLink

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• DRAFT 01 -19 -2011 1011.04 DEFINITIONS Unless specifically defined below, words or phrases used in this ordinance shall be interpreted so as to give them the same meaning as they have in common usage and to give this ordinance its most reasonable application. For the purpose of this ordinance, the words "must" and "shall" are mandatory and not permissive. All distances, unless otherwise specified, shall be measured horizontally. As used in this ordinance, the following words and terms shall have the meanings ascribed to them in this Section. BEST MANAGEMENT PRACTICES (BMP's) - measures taken to minimize negative effects on water resources and systems as documented in the Minnesota Construction Site Erosion and Sediment Control Planning Handbook (MBWSR, 1988), Protecting Water Quality in Urban Areas (MPCA, 2000) and the Minnesota Stormwater Manual (MPCA, 2006) as amended. BETTER SITE DESIGN(BSD) - a set of development or redevelopment site - design principles and techniques that seek to mimic natural conditions by soaking water into the ground close to where it falls, minimizing impervious areas to reduce overall runoff volume, reducing connected impervious areas, and preserving natural drainage patterns and surfaces. BIOFILTRATION— A stormwater quality and quantity BMP that utilizes vegetation and soil to filer and absorb pollutants including nutrients, hydrocarbons and metals and remove water volume through evapotranspiration. • CONSTRUCTION ACTIVITY- includes construction activity as defined in 40 C.F.R. pt. 122.26(b)(14)(x) and small construction activity as defined in 40 C.F.R. pt. 122.26(b)(15). This includes a disturbance to the land that results in a change in the topography, existing soil cover (both vegetative and non - vegetative), or the existing soil topography that may result in accelerated stormwater runoff, leading to soil erosion and movement of sediment into surface waters or drainage systems. Examples of construction activity may include clearing, grading, filling, and excavating. Construction activity includes the disturbance of less than one acre of total land area that is a part of a larger common plan of development or sale if the larger common plan will ultimately disturb one acre or more. • EROSION PREVENTION - means measures employed to prevent erosion including, but not limited to, soil stabilization practices, limited grading, mulch, temporary or permanent cover, and construction phasing. FILTRATION - A stormwater quality BMP that uses either natural media such as soil or vegetation or manufactured media to trap pollutants such as nutrients and particles in surface water. FINAL STABILIZATION - means that all soil disturbing activities at the site have been completed and all soils have be stabilized by a uniform perennial vegetative cover with a density of 70% over the entire pervious surface area, or other equivalent means necessary to prevent soil failure under erosive conditions. Alternative Format 3