Proposed Dates of Use: March 02-20, 2026; as weather conditions and operational factors permit
Street Address/Site Name: 45400 Country Road 28H (Wastewater Treatment Plant)
Detailed Location of Application Site: Fence lines, levees road tops, road sides, and fenced in areas.
Posting and Notification: Site notifications will be posted at least 48 hours before application at site entrances and will remain posted for 24 hours, and via the pesticide application electronic notification system.
Product (W/ active ingredients): LIifeline, Glufosinate-ammonium 24.5% EPA Reg #: 70506-310 Pesticide Type: Herbicide City Use Type: Tier III. Least Hazardous. Least Restrictive.
Product (W/ active ingredients): Homeplate, Caprylic Acid 44% Capric Acid 36% EPA Reg #: 67702-54 Pesticide Type: Herbicide City Use Type: Tier III. Least Hazardous. Least Restrictive.
Product (W/ active ingredients): Capstone, Aminopyralid 2.22% Triclopyr 16.22% EPA Reg #: 62719-572 Pesticide Type: Herbicide City Use Type: Tier II. Less Hazardous. Less Restrictive.
Product (W/ active ingredients): Activator 90, Alkylphenol ethoxylate, alcohol ethoxylate and tall oil fatty acid 90% EPA Reg #: CA Reg. No. 34704-50034 Pesticide Type: Adjuvant (non-ionic surfactant penetrant) City Use Type: Tier II. Less Hazardous. Less Restrictive.
Product (W/ active ingredients): Scythe, Pelargonic Acid 57% EPA Reg #: 10163-325 Pesticide Type: Herbicide City Use Type: Tier II. Less Hazardous. Less Restrictive.
Product (W/ active ingredients): AquaMaster, Glyphosate 53.8% EPA Reg #: 524-343 Pesticide Type: Herbicide City Use Type: Tier I. Most Hazardous. Most Restrictive.
Product (W/ active ingredients): Cleantraxx, Penoxsulam 0.85% & Oxyfluorfen 40.31% EPA Reg #: 62719-702 Pesticide Type: Herbicide City Use Type: Tier I. Most Hazardous. Most Restrictive.
Target Pests: Various perennial broadleaf & annual weeds; including pepper-weed, short-pod mustard, black mustard, Italian thistle, yellow star thistle, milk thistle, fluellin
Justification for Use: The use of herbicides are justified due to staff’s requirement to maintain safe access to the various critical infrastructure facilities on site and the Treatment Plant's regulatory requirement to keep levees free of vegetation for state inspectors year-round. The material used for the road tops and leaves are not conducive for typical mechanical landscaping maintenance equipment. Heavy use of mechanical tools may leave the road tops unleveled and increase safety risk to staff and critical infrastructure. Herbicides help staff manage the vast acreage of the WWTP and Wetlands in a cost-effective manner.
Explanation of IPM Methods Used: Staff primarily employ non-chemical control measures throughout the majority of the non-hardscaped areas within the sites. The sites receive a variety of mechanical methods where/when feasible including mowing, hand pulling, dragging/scraping, and weed eating to help control the weeds. The use of a power rake was explored in 2024 and has shown proven results around the wetlands and road tops. Previous use of herbicides has proven effective when applied strategically.
Strategies to Prevent Future Applications: The primary strategy to reduce the need for future herbicide applications is to manage the emerging vegetation and preventing seed-set. Effective products and strategically timed applications will decrease the overall reproductive material present in the soil. Division staff have incorporated the use a new power rake to reduce emerging weeds and reduce the amount of herbicide used. However, depending on conditions such as precipitation levels, ground temperature, operational priorities, the need for site access or public safety may affect this trend. Additionally, Staff are exploring the feasibility of prescribed grazing & burning for these sites.
Tier 1 Remarks: Areas where Tier 1 products are applied will be closed to the public during application and remain closed until the product has dried. Additionally, appropriate personal protective equipment will be used. Primary use of this Tier 1 product will be on critical infrastructure such as levees, pond road tops and edges to ensure site meets state regulatory compliance. Glyphosate is useful here as some of the targeted weeds reproduce from segmented material scattered from mechanical landscaping equipment, which in turn increase the vegetative pest infestation around these sites.
More information on the IPM Program, including the current Policies and Procedures guidance, can be found on the City's webpage: Integrated Pest Management
