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SECTION 1 Introduction pollution from Eugene's municipal stormwater system and protect and improve the water quality of our local waterways, including Amazon Creek and the Willamette River. Adaptive management to continually improve the effectiveness of the City's stormwater program and further reduce stormwater pollution is a regulatory expectation and is an on -going part of the City's stormwater program. Adaptive management coupled with the Issuance of the 2010 MS4 permit will result in additional refinements to the City's stormwater program, including in the following areas: • Stormwater Development Standards - As described in Action 4.3.2. of this plan, development standards for water quality were adopted City -wide in June 2006. Stormwater Development Standards apply to all new development and re- development that adds or replaces 1,000 square feet or more of impervious surface area. Acceptable stormwater management facility types along with siting and design criteria are included in the City's Stormwater Management Manual (SWMM). The current SWMM leaves the choice of facility type up to the applicant, as long as siting and design criteria are met. In response to the 2010 MS4 permit, Eugene's Stormwater Development Standards will need to be modified to prioritize low impact development techniques and green infrastructure facilities (for example: vegetated stormwater planters, rain gardens and swales) over mechanical treatment approaches (for example: prefabricated underground water quality treatment manholes) for managing stormwater. Making these changes will involve revising Eugene City Code and the SWMM. Draft revisions are under development for public review beginning in fall 2012, and adoption by the City Council in fall 2013. More information about the proposed Stormwater Development Standards changes will be posted on the City's web page by fall 2012. • Retrofit Strategy — Under the 2010 MS4 permit, the City is required to develop a strategy to retrofit its municipal stormwater system to further reduce pollution in runoff from existing developed areas. Over the past 20 years, Eugene has implemented many environmental restoration and stormwater system retrofit projects, developed concepts for additional retrofit projects (including via the Stormwater Basin Plans), and in a limited capacity worked with property owners to encourage retrofitting stormwater systems on private property. The City's retrofit strategy will be reviewed and refined as necessary to meet the 2010 permit conditions. Public input will be solicited on the City's retrofit strategy in approximately spring 2013. For more information and an up -to -date status on development of the City's retrofit strategy, see City's web site: http://www.eugene- or.gov. Go to Services > Stormwater > Stormwater Planning, Permits and Regulations > NPDES. Lane County's Municipal Stormwater Permit Lane County received its first MS4 permit in 2007. Lane County's permit was issued under Phase II of the program, and is therefore called a MS4 Phase II permit. The permit required Lane County to establish a stormwater program for the regulated area corresponding to the area between the city limits of Eugene and Springfield and the cities' Urban Growth Boundaries (UGB). Lane County was required to establish a stormwater program for the regulated area to address the following minimum control measures: N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc 1 -5