Authorizes the department of ecology to issue opinions for a portion of a facility under the model toxics control act.

Declares that nothing in chapter 70.105D RCW may be construed to preclude the department from issuing a written opinion on whether further remedial action is necessary at any portion of the real property located within a facility, even if further remedial action is still necessary elsewhere at the same facility. Such a written opinion on a portion of a facility must also provide an opinion on the status of the facility as a whole.