Project Detail

LONG LAKE PROT & REHAB DIST: 319 Match - LMI - Long Lake Alum Treatment and Monitoring

Purpose

Project Scope and Description of Deliverables The Long Lake Protection and Rehabilitation District is sponsoring a project to conduct an alum treatment and evaluation monitoring in Long Lake. Project final deliverables include: all data collected, final report Specific project activities include: 1) Alum treatment; 2) In-Lake water quality and sediment monitoring; 3) Point intercept aquatic plant survey 4) annual reports Special Conditions: 1) CLMN efforts should not be duplicated, and these data shall be included in the trends analysis and final reporting; 2) All data shall be entered into the SWIMS database; 3) Monitoring shall follow Department approved protocols This scope summarizes the project detail provided in the application and does not negate tasks/deliverables described there. Data, records, and reports, including GIS-based maps, and digital images, must be submitted to the Department in a format specified by the regional Lake Biologist. If consultant is to provide final report, it is recommended that Grantee provide DNR Lake Coordinator with a draft for comment on report adequacy prior to making final payment to the consultant. DNR to receive both paper and electronic .pdf copies of the final report along with, or prior to submission of grantee's final payment request.

Project Type

Lakes Grant

Project Sub Type

Lake Protection Grant

Project ID

LPT71621

Year Started

2021

Status

Complete

Reports and Documents

LPT71621_Progress Report_Long Lake 2022

Shallow Long Lake (273 ac surface area) has exhibited excessive summer cyanobacterial blooms and poor water quality (WQ) conditions (high phosphorus and chlorophyll concentrations and low water clarity) linked to internal phosphorus (P) recycling from sediments (James & Clemens 2017). A total aluminum sulfate (alum) dosage of ~ 105 g\/m2 split into lower concentrations and spread out over 2-year intervals was recommended to control internal P loading. The first alum dosage of 60 g\/m2 was applied to sediments located within the 15-ft depth contour of the lake on 11-13 June 2018 (HAB Aquatic Solutions). The second and third alum applications of ~ 25 g\/m2 and 20 g\/m2, respectively, were applied over the same depth contour in 2020 and 2022.

LPT71621_Map_Long Lake 2022

Map of aluminum sulfate treatment area.

LPT71621_Monitoring_Long Lake Application Logs 2022

Alum treatment records.

Activities & Recommendations

Grant Awarded

Grant LPT71621 awarded

Watershed

Waters

Purpose

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