10-25-1993 Council Packet - Laserfiche WebLink

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Comprehensive Plan Amendment - Adoption of Policy Language October 20, 1993 Page 2 development will be permitted to adversely impact its neighbors, or the City, by changing drainage patterns or by otherwise adversely affecting the storm water drainage. National Urban Runoff Program (NURP) standards will be applied to ^he design of new storm water ponds. Comprehensive Plan Part II, Chapter 3, "General Policies for Natural Resource Management" is proposed to be revised by adding policy number 16 on Page 3-22 to read as follows: 16.PROSION CONTROL BEST MANAGEMENT PRACTICES SHALL BE APPLIED. The MPCA’s Urban Best Manauernent Practices entitled "Water Quality in Urban Areas" shall be applied to the review of proposed development to reduce non-point source pollutant loadings in storm water runoff. To implement this policy, the Citv will incomorate these standards and requirements in its storm water management plan and land use controls. What are the NURP standards? Storm water ponds are created for new development in order to control and treat storm water runoff before it enters our lakes and streams. Various pond design parameters have an impact on the degree of storm water treatment. The NURP standards for detention ponds are described in the attached e,xcerpt from "Protecting Water Quality in Urban Areas". Perhaps the single most significant difference between a NURP pond and the ponds that the City was requiring in the 1980’s, is that NURP ponds arc "w-et" detention ponds, having a permanent water surface rather than draining dry a few days after the rainfall event. This allows for settling out of sediments. This results in good pollutant removal from small storm events, which are more numerous than larger storm events. \Vhat are "Best Managenient Practices Tlie Minnesota Pollution Control Agency has prepared a 200 page document entitled "Protecting Water Quality in Urban Areas". This document defines the negative effects of urbanization on water quality, gives a general background on the characteristics of urban runoff, and discusses the general implementation process for identifying existing and potential storm water quality concerns and selecting correct practices to manage those concerns. The document contains specific chapters on "storm water best management practices" (which incorporates the NURP standards), "housekeeping best management practices" such as fertilizer management, litter control, street sweeping, etc., and "coastruction site erosion and sediment control practices", which includes silt fencing, temporary sediment traps, etc. The City Engi^r and staff have been incorporating many of these "Best Management Practices in review and inspection of developments in Orono for many years, but we have never had such a specific document reference that provides methods and techniques for the various practices. Staff secs