5.8.11 Other Projects

This Plan identified the need to consider a number of additional projects, but those projects additional, but those projects were not included in the 2007-2016 prioritized CIP. Projects considered but not included are: lake vegetation management projects, internal load management projects for Stone Lake and Auburn West, and regional infiltration opportunities in subwatershed units SMC-7, SMC-49, SMC-56, SMC-61, and HB-1 (see Section 5.8.9 above). The Board may consider such a project during the time frame of this Plan if funds are available.

ProjectLake Aquatic Vegetation Management
DescriptionDesign and implementation of strategies to manage aquatic vegetation that contributes to internal phosphorus loading or degradation of water quality, biotic integrity
Need

As water quality in lakes improves, the aquatic vegetation communities may change. Improved water clarity may result in accelerated growth of aquatic vegetation that may increase internal phosphorus loading, negatively impact fish or aquatic invertebrate habitat, or increase susceptibility to invasive aquatic species. Management of aquatic vegetation that contributes to lake water quality and biotic integrity issues may require annual treatment for three to five years.

OutcomeImproved water clarity; more diverse aquatic vegetation and biotic communities; improved aesthetics
Estimated Cost and Funding

Project 1: Application of vegetation management techniques in Parley Lake. Funding source is the District capital levy.

Project 2: Application of vegetation management techniques in Wasserman Lake. Funding source is the District capital levy.

Project 3: Application of vegetation management techniques in Stone Lake. Funding source is the District capital levy.

Project 4: Application of vegetation management techniques in Auburn Lake East. Funding source is the District capital levy.

Project 5: Application of vegetation management techniques in Auburn Lake West. Funding source is the District capital levy.

$54,500

$42,100

$26,600

$39,300

$26,600

Schedule

No year has been assigned to these projects, which would be implemented on an as-needed basis. Vegetation management is most effective if applied annually for at least three years in a row.

ProjectStone Lake Internal Load Management Project
DescriptionDesign and implementation of strategies to reduce internal phosphorus loading, including: feasibility study; aquatic vegetation survey update and management plan; fishery survey update and management plan; biomanipulation strategies that may include aquatic vegetation management, zooplankton community and fishery manipulation, and chemical treatment
Need

The modeled watershed phosphorus wash-off load to Stone Lake is not sufficient to explain the in-lake concentration of total phosphorus that exceeds the lake's total phosphorus goal. An ?unknown load? to Stone Lake is attributed to internal loading, and is likely a combination of bottom sediments, aquatic vegetation, and model accuracy. A watershed and lake diagnostic / feasibility study will be required to confirm the internal and external phosphorous loading to Stone Lake, as well as the necessary load reductions. In particular, the ?unknown load? must be identified as either an external or internal load before specific strategies can be selected. A variety of strategies would be investigated in the diagnostic and treatment study proposed in this plan.

This project would identify and implement a suite of strategies to manage aquatic vegetation, the fishery, and zooplankton community to achieve water quality and clarity goals. The project includes an ongoing vegetation and fishery management plan.

OutcomeReduction in phosphorus load from internal sources estimated at 65 pounds annually; improved water clarity; more diverse aquatic vegetation community; improved aesthetics
Estimated Cost and Funding
Investigation, permitting, fish, vegetation, and
zooplankton surveys, and implementation of
strategies. Funding source is the District capital
levy.

$18,700 Design, surveys

$139,500 Construction

$158,200 Total

Schedule

One Year Prior to Implementation: Fish, vegetation, and zooplankton surveys, development of management plans

No Year Assigned: Implementation of strategies

ProjectAuburn Lake West Internal Load Management Project
DescriptionDesign and implementation of strategies to reduce internal phosphorus loading, including: feasibility study; aquatic vegetation survey update and management plan; fishery survey update and management plan; biomanipulation strategies that may include aquatic vegetation management, zooplankton community and fishery manipulation, and chemical treatment
Need

The modeled watershed phosphorus wash-off load to East and West Auburn Lakes is not sufficient to explain the in-lake concentration of total phosphorus that exceeds the lakes? total phosphorus goals. An ?unknown load? is attributed to internal loading, and is likely a combination of bottom sediments, aquatic vegetation, and model accuracy. A watershed and lake diagnostic / feasibility study will be required to confirm the internal and external phosphorous loading to the lakes, as well as the necessary load reductions. In particular, the ?unknown load? must be identified as either an external or internal load before specific strategies can be selected. A variety of strategies would be investigated in the diagnostic and treatment study proposed in this plan.

This project would identify and implement a suite of strategies to manage aquatic vegetation, the fishery, and zooplankton community to achieve water quality and clarity goals. Because Auburn East discharges directly to Auburn West, improvement of Auburn East is critical to improving Auburn West. The project includes an ongoing vegetation and fishery management plan.

OutcomeReduction in phosphorus load from internal sources estimated at 187 pounds annually; improved water clarity; more diverse aquatic vegetation community; improved aesthetics
Estimated Cost and Funding
Investigation, permitting, fish, vegetation, and
zooplankton surveys, and implementation of
strategies. Funding source is the District capital
levy.

$18,700 Design, surveys

$152,700 Construction

$171,400 Total

Schedule

One Year Prior to Implementation: Fish, vegetation, and zooplankton surveys, development of management plans

No Year Assigned: Implementation of strategies