Each permittee will be required to monitor, on a regular basis, each parameter included in its permit. Each permittee may also be required to monitor any other parameter(s) the executive director may reasonably deem necessary to adequately monitor the quality or quantity of any discharge. If the analysis of additional parameters is required, the permittee shall be provided written notification prior to the initiation of the requirement.
30 Tex. Admin. Code § 319.4