(2) The commission by rule may prescribe a lower maximum concentration of PCB for specific items, products or materials if it finds the 100 ppm concentration specified in subsection (1) of this section to be inadequate to protect the public health from the toxic dangers of the PCB contained in that item, product or material. However, an item, product or material for which a lower maximum concentration of PCB is prescribed by federal law, rule or regulation shall not be allowed a concentration of PCB higher than that federal maximum. [Formerly 468.903; 2007 c.71 §147]