2006-10-26_AgendaPacket - Laserfiche WebLink

Home

Step 2: Set beneficial use goals Expected Cost: $1,150 At the onset of any UAA process, it is important to get stakeholder input on the beneficial use (water quality) goals that have been set for their lake. The existing water quality goals for Lake Owasso will be reviewed during an initial meeting with the WMO and lake association. The goal of the meeting is to collect public input on desired beneficial uses of the lake and water quality perceptions. This feedback can help the WMO decide whether the existing water quality goals for the lake are still appropriate or if they should be changed in light of public opinion. The MPCA's proposed lake total phosphorus criteria (40 µg/L) will be taken into account in setting the beneficial use goals for the lake. Step 3: Assess attainment or nonattainment for current watershed land-use conditions Expected Cost: $350 In this step, the current and historical water quality of the lake will be compared to the beneficial goals set for them to assess whether or not these goals are met under current watershed conditions. The MPCA's lake total phosphorus criteria will also be compared to lake water quality conditions. Step 4: Estimate annual runoff and phosphorus budgets for Lake Owasso Expected Cost: $16,860 An important part of the UAA process is the use of a water quality model that predicts the amount of water and phosphorus that reach receiving water bodies via stormwater runoff under different watershed development and runoff management scenarios. Barr proposes to use the P8 computer model (Program for Predicting Polluting Particle Passage through Pits, Puddles and Ponds; IEP, Inc. 1990) to simulate the quantity and quality of the surface runoff entering Lake Owasso from the tributary watersheds. In the past 10 years, P8 has gained wide acceptance for modeling runoff water quality (and quantity), especially in the upper Midwest. Both the MPCA and the Wisconsin Department of Natural Resources (WDNR) have funded enhancements to P8. Barr has used P8 for many other UAA projects, including the Phalen Chain of Lakes Strategic Lake Management Plans for the RWMWD. To use P8 to its full potential, several different types of field information are required. However, we propose to collect some of this information specifically for this project, through the following efforts: • Collect, Review and Evaluate Storm Water Runoff Monitoring Data Three storm water inflow locations will be monitored at major inflow sites during the 2007 water year (Oct 06 -Sept 07) by RWMWD staff. The monitoring data will be used to calibrate the P8 model for both water and pollutant loading (total suspended solids and total phosphorus) from the lake's watershed. Barr Engineering Company ODMA\PCDOCS\DOCS\247725\ 1