A professional who controls mixing machine to blend asphalt paste of two or more colors to form marbleized asphalt tile. Respnsibilities include:

• Starts machine and turns valves to heat rollers to specified temperature, or until surface of rollers feels hot enough to melt and mix asphalt.
• Shovels or feeds asphalt paste of prescribed colors between rollers until mixing appears complete.
• Signals other workers to cut off and catch marbleized material emerging from machine, and directs helpers who assist in mixing, rolling, and cutting product.