06/16/92: ON SEPTEMBER 20, 1990 THE PORTABLE BOEING ASPHALT CONCRETE PLANT OWNED AND OPERATED BY THE BIA WAS FOUND BY EPA METHOD 9 VISIBLE EMISSION OBSERVATION TO BE IN VIOLATION OF THE NSPS OPACITY STANDARD OF 20%. A STACK TEST CONDUCTED BY ENERGY AND ENVIRONMENTAL MEASUREMENT CORPORATION ON SEPTEMBER 10, 1991, FOUND THAT THIS PLANT FAILED TO PASS THE NEW SOURCE PERFORMANCE STANDARD FOR PARTICULATE EMISSIONS OF 0.04 GRAINS PER DRY STANDARD CUBIC FOOT.