Keller Rohrback has also handled environmental litigation involving home heating oil, contaminated drinking water, contaminated sediments, landfill leachate, metal smelting and finishing wastes, tank farms, chemical plants, gas stations, and major manufacturing concerns.
Utilize the input text as a context reference, choose the right relationship between 'smelting' and 'metal' from the options.
Options: distributed by, director/manager, product/material produced, publisher