Admin Order 58-12-14 - Laserfiche WebLink

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Development standards to address pollution from private development would be more effective than treatment and infiltration of flows associated with drywell decommissioning and therefore should be a higher priority. [RR -121 Both are important and necessary aspects of the stormwater management strategy for RR -SC and are not mutually exclusive actions. Stormwater Development Standards are necessary for meeting the Clean Water Act and associated municipal stormwater permits issued to the City of Eugene (National Pollution Discharge Elimination System, or "NPDES" Phase I permit) and Lane County (NPDES Phase II permit). As described above, the City's stormwater development standards apply to properties inside city limits as well as any properties annexed to the city from the urban growth boundary. These standards address the water quality impacts from new development and re- development sites within city limits. Addressing existing UICs that must be decommissioned for lack of separation to high groundwater levels is also necessary to meet Safe Drinking Water Act regulations (see Department of Environmental Quality, or DEQ, web site for more information about UIC regulations and pending permits for municipalities utilizing UICs: ham: / /www.deq. state .or.us /wq /uic /permits.htm Providing treatment and conveyance for stormwater currently directed to certain UICs is necessary to address the potential water quality impacts to surface water (of surfacing water currently directed to sub - surface — for UICs decommissioned utilizing a piped system) and groundwater (to provide treatment of water directed to sub - surface, prior to reaching groundwater — for UICs decommissioned utilizing rain gardens). Reduce projected impervious surface area via development standards, and as a result CPs would be smaller in size. Requiring low impact development standards, pervious pavement for all roads, parking lots and driveways, and on -site storage and infiltration of all stormwater would reduce the size of capital projects. [SC -91 [RR -101 As described in responses above, the City provides incentives for certain best management practices (e.g. pervious pavement, eco- roofs, contained planters, and tree credits) through lower systems development charges and user fees, and through impervious surface area reduction in sizing stormwater facilities. The City encourages, but does not require, green infrastructure/LID facilities over structural engineered facilities. The majority of residential developments, and slightly more than half of the commercial developments over the past year have chosen to use green infrastructure /LID facilities. Follow through on Eugene City Council direction to further increase implementation of LID is underway. It is anticipated that all of these efforts will reduce the total impervious surface area in the RR -SC basin and throughout the City, as compared to traditional development. However, development standards and incentives affect only the areas undergoing development and re- development, and must be considered in the context of the large amount of existing impervious area not affected by the development standards. RR -SC Stormwater Basin Plan Comments Pg.9 of 17