Agmt11 Duke's Root Control, Inc.

Browse Search

• The environmental fate of diquat Dibromide is the tendency to adsorb to soils and organic solids, so that would imply that the tendency would be to adsorb into the plant biosolids and would be present in the plant effluent at lower concentrations than in the plant influent. • If all the collection systems discharging to SBSA were using the material on the same day there may be cause for concern since the concentration at the plant would be higher than calculated above. There is only one known vendor performing this service with this form of root control, so it is considered unlikely that there would be concurrent applications in different cities in the SBSA service area. Additionally, it is unknown if these projects are completed over several days or one day. A 10 gallon application project taking several days reduces the concentration at the plant . Conclusion SBSA does not regulate the use of Diquat Dibromide, Razorooter II, by the member collection agencies. Since the active ingredient in this form of root control can have an effect at SBSA it is requested that the member agencies inform SBSA through the Technical Services Source Control Department of its use. The information requested should include: • Total Volume of Razorooter II used for the entire project • Length of project • Time and date of use • Location(s) of use Reference material MSDS Razorooterll, from Seer Sciences, Inc. PAN pesticides Database — Chemical Toxicity Studies on Aquatic Organisms http : / /www.pesticideinfo.org /Detail Chemical jsp ?Rec Id= PC33217 Project Report to the Palo Alto RWQCP "Inhibtion of Activated Sludge Nitrification by Root Control Chemicals: An Initial Evaluation of Dosage and Contact Time S:1Discharges_ Non - routine & Low VolumeNon Routine DischargeslRoot Control ProductslRazorooter II.docx printed 2/1/11 2:26 PM