The city is considering a zoning amendment that would add additional rules and clearly define what is allowed at the facility, which is owned by Burns Construction. The company lists headquarters in Ansonia and Stratford. The facility has long been a source of frustration to nearby residents who have complained about quality of life issues. The amendment, if passed, would give specific starting and stopping times for the rock crushing from 7 a.m. to 7 p.m. weekdays. Rock crushing would not be allowed on holidays or weekends. The facility would also have to test equipment for noise levels and control the spread of dust from the rock crushing, Marini said.