In a letter dated May 11, 2012, EPA responded to NMFS’ draft biological opinion for three dinitroaniline herbicides’ effects on Pacific salmon, steelhead and their critical habitat, if designated.  The three herbicides are oryzalin, pendimethalin, and trifluralin. EPA criticized NMFS’s draft BiOp on several grounds, including NMFS’s “multiple conservative assumptions in exposure modeling leading to physically impossible results such as NMFS’ floodplain exposure results that exceeded chemical solubility limits.” 

● Click here to read EPA’s response to draft dinitroaniline BiOp.