2019.02.04 CC Packet - Laserfiche WebLink

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RCWD Permit Requirements RCWD permitting rules generally require the use of better site design techniques as outlined in Chapter 4 of the Minnesota Storm Water Manual (MPCA, 2007), and water quality and infiltration BMPs sized to infiltrate or retain the runoff volume generated within the contributing area by a 2.8 inch storm under the developed condition. Based on a memorandum prepared by HEI that analyzes the net benefit of these rules, to meet this requirement it will be necessary to provide systems to infiltrate approximately the first inch of runoff from new or redeveloping sites for most areas within the City of Hugo. It is the City of Hugo's intention to address these issues through onsite practices, regional practices, or both. Through the implementation of the above infiltration standards, approximately 80% of the runoff volume will be removed and no increase in runoff volume and pollutant loading will occur from new or redeveloping sites. This analysis also indicates that with this infiltration requirement, there is some potential for additional removal slightly over and above that associated with new development, but for planning purposes implementation of this practice will generally balance the impact of new development. Further reductions in nutrient loadings could take place as a result of providing infiltration for areas being redeveloped or through the implementation of regional improvements to reduce phosphorus loading independent of redevelopment, development, or reconstruction. In order to achieve RCWD permit requirement goals, the following actions need to be taken: a) New development and re -development must infiltrate or retain the runoff volume generated by a 2.8 inch rain event from all new or redeveloping area unless regional projects are constructed to achieve the same benefits. CIP for Storm Water Projects Within the City of Hugo City of Hugo, MN WSB Project No. 1687-85 Page 11