Aquatic Vegetation Management and Consultant Services

The vendor is required to provide aquatic vegetation management and consultant services the project includes:
•    The proposed project aims to control invasive aquatic plants and nuisance native aquatic plants along residential shorelines. 
•    A pretreatment survey should be conducted in May and June to identify new or expanded invasive aquatic plants, and the densities and problem areas of nuisance native aquatic weed growth invasive aquatic plants growth can be specifically targeted with a systemic herbicide or controlled with contact herbicides in conjunction with native aquatic weed control. 
•    The degree of nuisance native aquatic weed control will be determined by pre-treatment surveys in June. 
•    Per permit restrictions, only thirty percent (30%) of the big lake littoral zone can be treated with a contact herbicide to control nuisance native aquatic plants. 
•    Targeted control of noxious water lilies should only occur when wind conditions are minimal (below 10 mph). 
•    Yellow flag iris and purple loosestrife, if present, will also be targeted for control, but only with permission from the city. 
•    Securing the aquatic plant and algae management national pollutant discharge elimination system (NPDES) general permits for both lakes from ecology and adhering to all applicable law rules, and regulations concerning aquatic herbicide application related to the project work.
- Regarding algal bloom management, a general scope of work would work to create a phosphorous management plan and include:
•    Collect sediment samples for level 2 fractionation, and sediment samples for level 3 fractionation in order to calculate the pounds of mobile phosphorus stored in the lake sediments that need to be targeted. 
•    Collect baseline water quality data including total and free reactive phosphorus, nitrogen, PH, hardness, dissolved oxygen and temperature from at least three sampling stations are the surface and at depth.
•    Repeat this in the spring after the lake stratifies.
- Non-aquatic vegetation surveys
1. survey
•    The contractor shall perform a minimum of two (2) surveys per year of the lake’s shoreline and the adjacent 100-foot area to identify non-aquatic invasive vegetation, including but not limited to poison ivy and knotweed.
2. Treatment
•    The contractor shall submit a report, map, and abatement costs detailing all occurrences of non-aquatic invasive vegetation and shall perform the necessary treatment to eradicate the identified species.
- Aquatic vegetation surveys
1. Pre-treatment survey
•    Notify the city’s staff in writing no less than three (3) workdays in advance of the survey date. 
•    Prepared to accommodate city’s staff during survey operations. 
•    Conduct one (1) pre-treatment aquatic vegetation survey no later than May or June to identify invasive aquatic plants, the density and distribution of aquatic vegetation throughout the lake littoral zone. 
•    Surveys should include surface observation, rake-toss technique along transects, to accurately map and identify plant densities. 
•    Communicate the survey results to city’s staff, including recommended actions and estimated costs that may serve as the basis for developing a task assignment for additional work under this contract.
2. Post-treatment survey
•    City staff in writing no less than three (3) workdays in advance of the survey date. 
•    The contractor shall be prepared to accommodate city’s staff during all survey operations. 
•    Only if determined necessary, approved by city’s staff, and budget allows, will contractor conduct one (1) brief post-treatment observational survey late-July (no more than three (3) weeks following treatments) to determine any lake areas that may require a secondary spot treatment. 
•    Conduct at least one (1) post-treatment aquatic vegetation survey mid-September to evaluate the effectiveness of aquatic herbicide treatments and to look for any new invasive aquatic plant growth. 
•    Email the survey results to city staff, including recommended actions and estimated costs that may serve as the basis for developing a task assignment for additional work under this contract.
3. Aquatic plant control maps
•    Produce maps illustrating the treatment area, invasive aquatic plant species, and aquatic plant densities pre- and post- treatments.

- Contract Period/Term: 1 year
- Questions/Inquires Deadline: November 21, 2025