SECTION 252:606-11-5. Industrial flow measuring and sampling

(a)   If required by the DEQ, place a flow-measuring device to measure only the wastewater discharge.

(b)   Provide easily accessible sampling points at the outfall of each treatment structure.

(c)   Upon request by the DEQ, provide five (5) days prior notice to the DEQ of the next sampling schedule so that DEQ personnel may be present to observe and collect split samples.

(d)   Minimum process control tests are tabulated in Appendix A of this Chapter, entitled, "Minimum Control Tests for Wastewater Treatment Facilities." The Executive Director may require that all effluent samples be collected from the outfall pipe at the point of discharge where conditions are such that the effluent quality will likely be different at this point than it is in the final treatment or storage unit.

(e)   When required in a facility's discharge permit, stream monitoring samples must be collected instream above and below the point of wastewater discharge with consideration to the following factors: ease of access; mixing of plant effluent and the receiving stream; and the oxygen "sag" point of the receiving stream.

(1)   Determine dissolved oxygen, temperature, pH, and stream appearance as noted in the permit twice per month at least two weeks apart, but not more often than required in the permit for effluent sampling for BOD5.

(2)   Test for coliform bacteria twice per month at least two (2) weeks apart, but not more often than required in the permit for effluent sampling for coliform, if the permit for discharge contains coliform limits.

(3)   The DEQ may require additional tests when problems develop in plant operation, or as necessary to determine compliance with the purposes and objectives of this Chapter.

(f)   The Executive Director may grant variances from the requirements in this Section upon a written request and a showing by the permittee that the requested variance will:

(1)   Not adversely affect the quality of the discharge nor the environment;

(2)   Avoid an excessive requirement; and

(3)   Not hinder the proper operations of the treatment facility.

[Source: Added at 21 Ok Reg 1584, eff 6-11-04; Amended at 28 Ok Reg 1231, eff 7-1-11]