CC - Agendas - City Council - REGULAR - 8/14/2018

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8.C.e Risk Mitigation Additional Data Required Diquat dibromide poses only minimal risk to non -target insects. However, levels of concern have been exceeded for endangered species of mammals and birds from all terrestrial use sites. EPA is requiring the following risk mitigation measures for diquat dibromide: Aquatic Risk Mitigation - To protect aquatic organisms, EPA is requiring labeling that limits application of diquat dibromide to one-third or one-half of the dense weed areas in a water body, and prohibits subsequent applications for two weeks. The untreated part of the water body will act as a refuge for aquatic organisms, and the two -week waiting period allows time for oxygen levels to recover before further applications are made. Spray Drift Risk Mitigation - Since the possibility of risk to non - target aquatic and terrestrial plants from aerial application is high, EPA is requiring that a Spray Drift Advisory which recommends best management practices to minimize spray drift appear on labels of products that can be applied aerially. Application and Post -Application Risk Mitigation - To protect handlers during agricultural use, EPA is requiring closed mixing/loading of diquat dibromide liquid formulations for aerial applications, in keeping with WPS provisions. EPA also is requiring a 7-day interim Restricted Entry Interval (REI) for all uses within the scope of the WPS, as well as more stringent Personal Protective Equipment (PPE) including protective eyewear for early -entry workers. For occupational uses that are not within the scope of the WPS (primarily the turf use), EPA is establishing a 4-day entry restriction for workers. EPA is retaining the 24-hour swimming prohibition on diquat dibromide products with aquatic uses. Swimmers are prohibited from swimming in treated water for 24 hours. To protect home users, EPA is establishing an entry restriction for spot treatment applications (label directions warning people and pets not to touch treated plants until sprays have dried), and is prohibiting broadcast applications at residential sites. EPA is requiring the following additional generic data for diquat dibromide to confirm its regulatory assessments and conclusions: o Enforcement method for plant and animal commodities (independent laboratory validation); o Product chemistry. Attachment: EPA Facts (2109 : Dukes Root Control) 6 Packet Pg. 60