10-21-2004 Council Work Session - Laserfiche WebLink

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r >1 water quality for Stubbs Bay. In addition, this option combines the mo- •; feasible and constructiblc options that would have lower land acquisition coits. A bathymetric survey of the pond in Subwatershed CLC-4 should be completed to verify that the e.xisting treatment volume is significantly less than the volume assumed for improvement option #8. 4.3 Monitoring Program Recommendations Currently, the MCWD watershed monitoring program includes collection of water quality grab samples and flow measurements on a weekly basis from the Classen Lake and Stubbs Bay Inlet creek sites. The samples are analyzed for total phosphorus, soluble reactive phosphorus, total nitrogen, total suspended solids, chloride, fecal, coliform. temperature and dissolved oxygen. The current MCWD lake monitoring program includes collection of water quality samples and measurements on a bi-weekly basis from the deep-hole location of Stubbs Bay. The surface water samples are analyzed for total phosphorus, soluble reactive phosphorus, chlorophyll-a. total nitrogen, chloride. Thermocline and deep-water samples are analyzed for total and soluble reactive phosphorus. Also, temperature, dissolved oxygen, pH, and conductivity profile measurements (at one meter intervals) are taken throughout the water column, along with a Secchi disc measurement. As previously discussed, some macrophyte surveys have been completed on Stubbs Bay in the past, but there currently arc no plans for another detailed survey to determine plant densities along transects throughout the lake urea. Also, water quality samples from Stubbs Bay have not been analyzed for phytoplankton and zooplankton species. The Stubbs Bay diagnostic and feasibility sfadies have idenified the following water quality concerns and issues associated with implementing the potential improvement options: Both watershed and internal sources of phosphorus arc contributing, and w ill continue to contribute, to the impaired water quality of the lake. It is important to collect detailed water quality data to establish an accurate account of the internal and e.\tcrnal phosphorus loadings to Stubbs Bay before future development and implementation of watershed and in-lakc improvement options. A significant reduction in the in-lake phosphorus concentrations may significantly reduce algae growth, but in turn, may booat the growth of macrophytes. It Is impo*iant to collect detailed data and establish the baseline conditions for the presence of the predominant macrophyte species in Stubbs Bay. P V21\27\FI(M>iafl SUibbi Bay Feaiibitity Study do,!