St. John's Cleaners violated the requirements of the National Perchloroethylene Air Emission Standards for Dry Cleaning Facilities ( Perc dry cleaning regulations ), found at 40 CFR 63.323(a)(1), 63.323(a)(2), 63.324(d) 63.324(d)(1), 63.324(d)(2), 63.324(d)(5), 63.322(1) and 63.324(d)(3.