Okla. Admin. Code § 252:628-11-6

Current through Vol. 41, No. 19, June 17, 2024

Section 252:628-11-6 - Trend monitoring

(a)General. IPR receiving waterbody monitoring data shall be analyzed for trends over multiple time steps and periods. The intent of trend monitoring is to alert the permittee to changes in the IPR receiving waterbody before action levels are reached or beneficial uses are impaired. Data collection shall be adequate to meet assumptions and requirements of statistical tests and models.

(b)Types of trends. The permittee shall monitor trends for DEQ-approved parameters. The trends, including the trends from the inception of the IPR Source Water discharge, shall be monitored by the following techniques, or other DEQ-ap-proved methods.

(1)Regression analysis. Using available data collected from the first day of IPR Source Water discharge, evaluate linear and non-linear relationships of concentration or loads versus time. Use of concentrations or loads will depend on parameter. Regression analysis may also be run for shorter time periods.

(2)Running average. A running average shall be based on the sampling frequency (e.g., a running weekly average for daily monitoring, a running monthly average for weekly monitoring, etc.).

(3)Projection. Projections may be determined by calculating the sum of the two previous quarter's results plus twice the current quarter's results, with the sum divided by four, or by a similar method.

(c)Reporting. Permittee shall report trend monitoring results on the LMR form as required in the permit.

Okla. Admin. Code § 252:628-11-6

Adopted by Oklahoma Register, Volume 35, Issue 24, September 4, 2018, eff. 9/15/2018