Downtown Chanhassen BMP Retrofit Assessment

We estimate that by implementation of up to 20 bacteria reduction practices, bacteria will be reduced by approximately 30 percent or 15,721,900 10^9 Colony Forming Units (CFUs) per year. This reduction will help to rectify the impairment which currently results in a recreational hazard. These practices will coincidentally also reduce levels of nutrients and sediment in the river working to improve water clarity which is adding to the turbidity impairment in the river . Should effectiveness monitoring indicate that bacteria levels are not meeting standards at the end of the grant cycle (although the plan is to maintain the pasture and manure management program even after the grant term) the ERWA will continue to move forward with additional bacteria reduction activities identified in the ERWA TMDL such as working with the County to identify and upgrade leaking septic systems.