The following shall be accomplished to detect mining solutions in designated monitor wells:
- (1) Routine sampling. Water samples shall be taken at least twice a month at two-week intervals from all monitor wells for permit/production area(s) in which mining solutions have been introduced. These shall be analyzed for the control parameters 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. These data shall be kept readily available on site for review by commission representatives.
- (2) Duration of monitoring program. 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 show that the value of any control parameter 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) Sampling frequency when mining solutions present. During the period of time when mining solutions are present in a designated monitor well, water samples will be taken at least two times per week and analyzed for all control parameters by the second day after the sample is taken.
Source Note:The provisions of this §331.105 adopted to be effective May 13, 1986, 11 TexReg 1985; amended to be effective November 23, 2000, 25 TexReg 11433.