Texas Administrative Code
Title 30 - ENVIRONMENTAL QUALITY
Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
Chapter 331 - UNDERGROUND INJECTION CONTROL
Subchapter F - STANDARDS FOR CLASS III WELL PRODUCTION AREA DEVELOPMENT
Section 331.105 - Monitoring Standards
Current through Reg. 50, No. 13; March 28, 2025
The following shall be accomplished to detect mining solutions in designated monitor wells:
(1) Routine monitoring. Water samples and, if applicable, field instrument measurements, shall be conducted in accordance with the requirements of § 331.84(c) of this title (relating to Monitoring Requirements) from all monitor wells for permit/production area(s) in which mining solutions have been introduced. Monitoring results for the control parameters shall be completed by the second working day and reported as required in § 331.85(e) of this title (relating to Reporting Requirements). The determined values shall be entered on appropriate forms within three working days after analysis or instrument measurement. These data shall be kept readily available on site for review by commission representatives.
(2) Monitoring duration. The program of monitoring detailed in paragraph (1) of this subsection shall be continued in each permit/mine area until the executive director is officially notified that restoration has commenced. Further monitoring as required by permit shall continue until aquifer restoration and stabilization in that particular permit/mine area has been achieved in compliance with § 331.107 of this title (relating to Restoration).
(3) Verifying analysis. If the results of a routine sample analysis or instrument measurement show that the value of any control parameter in designated monitor wells is equal to or above the upper limit established for that permit/mine area, the operator shall complete a verifying analysis of samples taken from each apparently affected well within two days.
(4) Excursion monitoring. During the period of time when mining solutions are present in a designated monitor well, water samples or measurements will be taken at least two times per week and monitoring results for all control parameters shall be completed by the second day after the sample or measurement is taken.
