Before adopting building standards or adopting or revising other standards and regulations for the handling, processing, storing, use, recycling, and disposal of hazardous and extremely hazardous wastes, the department shall hold at least one public hearing in Sacramento, or in a city within the area of the state to be affected by the proposed regulations. Except as provided in Section 18930, the department shall adopt the proposed regulations after making changes or additions that are appropriate in view of the evidence and testimony presented at the public hearing or hearings.