Goose Lake Alum Treatment 2020
East Goose Lake (62-0034) in White Bear Lake, MN, is a listed impaired waterbody (303(d) Impaired Waters) for nutrient levels for recreational use. East Goose Lake total phosphorus (TP) and Chlorophyll-a levels average nearly 4 times shallow lake State standards. High nutrient levels have resulted in a lake that is devoid of vegetation and dominated by algae, including blue-green algae. VLAWMO seeks funding to perform a 2-phase alum treatment on East Goose Lake, as the most cost-effective means to remove biologically available phosphorus from the water column in East Goose and also improve the unnamed wetland, locally referred to as West Goose, located directly downstream (62'0126).
Studies conducted on East Goose Lake show that 88% of East Goose Lake's phosphorus loading is internal. Reports that provide more detail include the TMDL (Wenck, 2014) and feasibility study (Barr, 2018). A 91% overall reduction in phosphorus is needed to meet the MPCA TP standard for shallow lakes (Wenck, 2014).
Historical accumulated inputs combined with external inputs led to the current internal load. East Goose Lake was the discharge point for the White Bear Lake Wastewater Treatment Plant from the 1930s to the 1960s. Addressing problems in East Goose lake are important because it is part of the headwaters of Lambert Creek, tributary to East Vadnais Lake, which is the drinking water reservoir for more than 430,000 St. Paul residents. This area is also identified by the MDA Source Water Protection Area Map as High Priority (See attachments).
External loading has been and continues to be reduced in the subwatershed. Best management practices (BMPs) have been completed including stormpond additions (N = 7), a network of raingardens on County Rd. F, and major redevelopment BMPs. In 2019, Barr Engineering completed hydraulic/hydrologic modeling to identify and provide preliminary designs of 3 projects (WBF Grant P19-3281). One of these projects will be implemented spring 2020.
(b) $16,000,000 the first year and $16,000,000 the second year are for grants to local
government units to protect and restore surface water and drinking water; to keep water on the land; to protect, enhance, and restore water quality in lakes, rivers, and streams; and to protect groundwater and drinking water, including feedlot water quality and subsurface sewage treatment system projects and stream
bank, stream channel, shoreline restoration, and ravine stabilization projects. The projects must use practices demonstrated to be effective, be of long-lasting public benefit, include a match, and be consistent with total maximum daily load (TMDL) implementation plans, watershed restoration and protection strategies (WRAPS), or local water management plans or their equivalents. A portion of this money may be used to seek administrative efficiencies through shared resources by multiple local governmental units. Up to 20 percent of this appropriation is available for land-treatment projects and practices that benefit drinking water. (Projects and Practices 2020)
An annual reduction of 800 lbs of phosphorus per year during treatment is projected in East Goose Lake with a lifespan of 10-15 years. Monitoring will be conducted twice per month, May through Sept. Long-term monitoring has been in place since 2007.
LOCAL LEVERAGED FUNDS