                   Dimethenamid/Dimethenamid-p Meeting Notes
                               October 19, 2020
                                       
Participants
Craig Kleppe, BASF
Jeff Holmsen, BASF
Cathryn Britton, Branch Chief, PRD, EPA
Lauren Weissenborn, CRM, PRD, EPA
Derek Berwald, BEAD, EPA
LisaRenee English, BEAD, EPA
Stephen Jarboe, BEAD, EPA
Andrew Lee, BEAD, EPA
Briana Otte, BEAD, EPA
Jessica Post, BEAD, EPA

Current Schedule
Dimethenamid/dimethenamid-p PID is due to be signed this quarter (12/31/2020) Human Health Risks
Occupational Handler  -  mixer/loader/applicator
 Current labels require baseline PPE including gloves and eye protection, but no respirators
 There are risks with the Nursery, Vineyard/Orchard, and Typical Crop scenarios involving the use of mechanically pressurized handguns
 Nursery use is the main concern and mechanically pressurized handguns are generally not used on typical field crops.
 Nursery is typically a liquid application; however, use of dimethenamid on turf and ornamentals is generally split between a liquid and granular formulations. BASF wants to maintain both formulations of dimethenamid.
 Proposed mitigation includes the addition of a PF10 respirator for mechanically pressurized handguns
 BASF proposed the addition of a PF-50 respirator, since the MOEs would still be below the LOC with only a PF10.  BASF also indicated they would share references to this respirator. Group discussed feasibility of changing the spray volume; however, there are concerns with ending up with a rate that is not efficacious.
 BASF raised a question about the vineyard/orchard use modeled in the Human Health risk assessment and asked EPA to confirm if that scenario was intended to represent the hops use on labels.  BASF supported adding a respirator for handlers using a mechanically pressurized handgun when applying to hops.

Occupational Handler  -  mixer/loader
 There are risks of concern with liquid, commercial treatment; Fertilizer, dry bulk, impregnated; MOE=670 (LOC=1,000)
 BASF indicated that they are willing to raise the minimum amount of fertilizer applied per acre from 200 to 300 lbs of treated fertilizer/ A, which would effectively decrease the risk to mixer/loaders.  EPA requested BASF provide additional information on the risk calculations and assumptions for this change.  EPA also requested additional information on how application information is passed along from commercial fertilizer facilities to the end user to better understand the feasibility and enforceability of this change.  

Ecological Risks
 Spray Drift: For ground applications, proposing to raise the windspeed to 15mph, coarse droplet size, low boom height.
 All other scenarios  -  updating the advisory statements for Surface Water, Groundwater, and Runoff. 
 BASF agreed with both of these mitigation measures

                                       
