 |
Oklahoma Administrative Code (Last Updated: March 11, 2021) |
 |
TITLE 252. Department of Environmental Quality |
|
Chapter 606. Oklahoma Pollutant Discharge Elimination System (OPDES) Standards |
|
Subchapter 11. Tests and Reports |
SECTION 252:606-11-2. Laboratory analyses and reporting
Latest version.
- (a) Compliance test results. Analytical results obtained through compliance testing must be from an accredited laboratory. Non-accredited laboratories at municipal wastewater treatment plants must have operators certified under OAC 252:710.(b) Sample collection. Collect samples during normal operation and representative of the discharge, according to 40 CFR § 136.3 Table II (containers, preservation and holding times).(1) A grab sample must consist of one sample collected in less than a 15-minute period.(2) A composite sample must consist of at least three discrete samples of equal volume taken at equal time intervals over the composite period, or taken proportional to flow rate, and combined into one. 24-hour composite samples must contain at least 12 discrete samples. The number of discrete samples must be increased where the wastewater loading is highly variable.(3) Continuous or totalized samples must be continuously and automatically taken or recorded.(c) Flow measurement. Determine the volume of flow at the time of sample collection and report it with the analytical results. Measurement devices and methods must be installed, calibrated and maintained to measure flows within 10% of true discharge rates. Records of pump running times and rates, if accurate, may be used to calculate total daily flow.(d) DMR reports. The results of all valid compliance tests must be used to complete DMR forms (DEQ-approved discharge monitoring report form; see 40 CFR § 122.41(L)(4)(i)). Mail DMR forms to the Water Quality Division at the frequency required in the permit. Any DMR report submitted to DEQ pursuant to this Chapter shall be submitted on forms provided by DEQ and shall be delivered to DEQ:(1) in person,(2) by mail, or(3) electronically, provided the electronic submission meets the requirements of 252:4-17.