THIS NSPS ASPHALT PLANT HAS NOT BEEN PROPERLY MAIN- TAINING ITS SCRUBBER, DESPITE REPEATED WARNINGS FROM AND COMMITMENTS TO MDNR, STARRY CONSTUCTION'S FAILURE TO MAINTAIN THE SCRUBBER IS A VIOLATION OF 40 C.F.R. 60.11(D) WHICH REQUIRES OPERATORS TO USE GOOD AIR POLLUTION CONTROL PRACTICE FOR MINIMIZING EMISSIONS .