Final answer:
Without access to specific Railroad Commission regulations or guidelines related to new installations with aggregate water capacity, it's not possible to provide a definitive timeframe for an inspection. Legal guidance, or reference to the official Railroad Commission directives, is necessary to obtain a precise answer.
Step-by-step explanation:
The question concerns the regulatory requirements of the Railroad Commission in relation to inspections of new installations for water storage. Unfortunately, without specific references to the applicable laws or regulations from the Railroad Commission governing inspections for new installations with aggregate water capacity, it is not possible to provide a definitive answer regarding the required timeframe for conducting an inspection. It is important to consult the latest regulations or directives from the Railroad Commission or to seek legal guidance to obtain accurate information.