(a) During performance testing, the owner or operator shall operate the source at the maximum rated capacity, or as near thereto as practicable.(b) The owner or operator shall conduct additional performance testing requested by the executive director using test methods allowed in §112.225 of this title (relating to Approved Test Methods).(c) When analysis of produced carbon black, carbon black oil, and fuels, including but not limited to tail gas, is required for monitoring under §112.223 of this title (relating to Monitoring Requirements), the owner or operator shall use a test method in §112.225 of this title for the analysis.