2012-08-28_PWETC_AgendaPacket - Laserfiche WebLink

Home

4.2 Surface Water Protection The City of Roseville seeks to maintain and improve the water quality in its lakes, ponds and wetlands. Water quality is often directly related to the water clarity (suspended solids) and level of available nutrients in a water body. While nutrients comprise only one category of substances that can affect water quality, nutrients (principally phosphorous) must be controlled to achieve the water quality goals of this Plan. Phosphorous is most often the limiting factor for plant growth, and increases in available phosphorous allow plant species to dominate the lakes, ponds and wetlands. Many people do not realize that when organic materials, like leaves, grass clippings, fertilizer and pet waste, enter a waterbody, they can disrupt the ecosystem. Once in the water these organic materials decay, releasing phosphorus. Excess phosphorus increases algae growth, inhibiting the growth of other aquatic plants. When algae die and decay, they exert a biological oxygen demand on the lake, depleting available oxygen for fish and other aquatic species. Limiting nutrient loading to surface waters is one of the keys to maintaining and improving water quality. There are several activities that can be followed to minimize the delivery of suspended solids and phosphorus into the City's water bodies. These activities include better management of construction site erosion control measures, reducing the level of impervious cover, reducing the extent of managed lawn areas and replacing them with native vegetation, reducing bank erosion, and requiring more infiltration and volume control best management practices for storm water treatment. Residents can also do their part by keeping grass clippings, fertilizer and pet waste out of the streets where it has a direct route into the storm sewer systems and ultimately into lakes, ponds, and wetlands. To reduce the impacts to shoreland and wetlands the City as adopted a Shoreland, Wetland, and Stormwater Management ordinance. The purpose of the ordinance is to control and guide future development within and surrounding those land areas which are contiguous to designated bodies of public water and areas of natural environrnental significance. Any water resource on property to be developed will be subject to these management policies, as well as the rules and requirements of the Wetland Conservation Act, the City and the watershed management organizations. Table 8 Goal 2 — Surface Water Protection Comprehensive Surface Water Management Plan ROSEV120222 City of Roseville Page 19 Policy No. Goal 2: Surface Water Protection - Policies 1 The City shall enforce the Erosion and Sediment Control ordinance (City Code Section 803.04) for all land disturbing activity greater than 10,000 square feet or adjacent to a water resource. 2 The City shall require stormwater treatment for land disturbing activities exceeding one -half acre or 5,000 square feet new impervious. The level of treatment provided shall comply with the infiltration/volume reduction standards or if infiltration is not feasible remove 90% of total suspended solids and 60% of total phosphorus. 3 The City shall enforce the Shoreland, Wetland, and Storm Water Management ordinance to regulate alterations of shorelands and wetlands and to maintain Comprehensive Surface Water Management Plan ROSEV120222 City of Roseville Page 19