Silver Lake TMDL Monitoring: FY10 Continuation [NER_05_CMP11]

Purpose

Silver Lake has received considerable best management practices including diverting Silver Creek from the lake, eradication and restocking with desirable fish species, and an alum treatment to seal the deep water sediments from phosphorus release. In addition, in 2009 aquatic macrophytes were transplanted into Silver Lake under an experimental project designed to determine if transplanting is a viable technique to introduce desirable native plants in the lake. The best management practices have improved the lake to a point where it has been recommended to be removed from the 2010 impaired waters list. However, we need to continue to monitor Silver Lake to assess the impacts from the 2008 flood that brought a huge amount of phosphorus and sediment into the lake from Silver Creek and to determine how successful the bio-manipulation effort has been. This study would examine the impact of this flooding event on the lakes ecosystem and help determine if the lake is continuing to meet its water quality objectives. In addition, this project would assess the success of the macrophyte transplanting effort.

Objective

Mary Gansberg will collect water quality (Carlson's trophic status) and plankton samples and assess the aquatic macrophyte community on Silver Lake. Paul Garrison will collect sediment samples to assess the condition of the alum layer. Water chemistry samples will be collected at two locations - deep hole in both the east and west basins. Dissolved oxygen and temperature profiles and plankton samples will be collected during each sampling event. Zebra mussel veligers and spiny water flea sampling will be done during July and August. In addition, an aquatic plant survey may be completed in August. This monitoring will require eight trips to the lake (6 water sampling events and 2 trips for the plant survey). This study would examine the impact of this flooding event on the lakes ecosystem and help determine if the lake is continuing to meet its water quality objectives. In addition, this project would assess the success of the macrophyte transplanting effort.

Outcome

Performance Measures: These are milestones that will be reported on in the Division Quarterly Report. Please estimate dates in a manner that encourages success. 1) Number of sample sites associated with the project. 2 2) Number of sampling events associated with project. 8 3) Estimated date when sample collection will be complete. 10-1-2010 4) Estimated date when all data will be entered into appropriate database. 6-30-2011 5) Estimated date when final report will be complete. 6-30-2011

QA Measures

Run Project Summary Report

TMDL/303d Projects
Determine Pollutants or Impairments
NER_05_CMP11
2010
Complete
 
Reports and Documents
'After a full and complete review, EPA finds that the TMDL for Silver Lake satisfies all of the elements of an approvable TMDL. This document addresses a total of 1 TMDL for 1 waterboy with a total of 2 impairments from the 2002 Wisconsin 303d list.'
Report on water quality, sediment core analysis, zooplankton, aquatic plants, zebra mussel, etc and general condition of lake to date.
Silver Lake Aquatic Planting Restoration Effort in 2009
Summary of monitoring data on Silver Lake, Manitowoc County.
Final TMDL Report
 
Activities & Recommendations
Monitor to Evaluate Projects
WBIC 67400, Silver Lake