For each process vent or storage tank vent emission limitation in Sec. 63.7184 for which initial compliance is demonstrated by meeting a percent by weight HAP emissions reduction, or a HAP concentration limitation, you must conduct performance tests or an initial compliance demonstration within 180 days after the compliance date that is specified for your source in Sec. 63.7183 and according to the provisions in Sec. 63.7(a)(2).