Mo. Code Regs. tit. 10 § 20-9.010
Current through Register Vol. 49, No.12, June 17, 2024
Section 10 CSR 20-9.010 - Wastewater Treatment Systems Operation Scope MonitoringPURPOSE: The amendment will revise minimum operational monitoring requirements for wastewater treatment facilities to include technologies that are not reflected in the current rules.
(1) Definitions. Definitions as set forth in the Missouri Clean Water Law and 10 CSR 20-2.010 apply to the terms to be used in this rule, unless the context clearly requires otherwise.(2) Operational laboratory tests and related monitoring for waste-water treatment systems control are a supplement to the Missouri State Operating Permit (MSOP) requirements. These operational monitoring reports shall be submitted to the department along with the MSOP discharge monitoring reports.(3) The department may modify monitoring frequency required in this rule based upon the department's judgement of monitoring needs for process control at a specified facility.(4) These requirements for laboratory tests shall apply to all waste- water treatment systems owned or operated by or for municipalities, public sewer districts, or other local government entities, private sewer companies regulated by the Public Service Commission, and the state agencies or any subdivision of them, with a population equivalent, as defined in 10 CSR 20-9.020, greater than two hundred (200). All other systems are exempt.(5) Minimum monitoring requirements to ensure adequate waste-water treatment systems in-plant operational control are as follows: (A) Lagoons 1. Discharging - Two (2)/Week Frequency. |
Precipitation |
Flow | Influent or Effluent |
pH | Primary Cell |
D.O. | Primary Cell |
2. Non-Discharging - Two (2)/Month Frequency. |
Precipitation |
Flow | Influent or Effluent |
pH | Primary Cell |
D.O. | Primary Cell |
(B) Mechanical Plants. 1. All types-daily (Monday - Friday) frequency. Precipitation |
Flow | Influent or Effluent |
pH | Influent |
Temperature | Aeration basin |
2. Additional laboratory test requirements for wastewater activated sludge processes and modifications: Influent | Mixed Liquor |
TSS | 1/week | 1/week |
Settleability | Daily (Monday - Friday) (sample contact and reaeration basins for contact stabilization) |
D.O. | Daily (Monday - Friday) (sample contact and reaeration basins for contact stabilization) |
Temperature | Daily (Monday - Friday) (sample contact and reaeration basins for contact stabilization) |
3. Additional tests for facilities having digesters: Anaerobic | Aerobic |
pH | Daily (Monday - Friday) | - |
Temperature | Daily (Monday - Friday) | - |
D.O. | - | Daily (Monday - Friday) |
(C) Recirculating filter media beds: Pressure 2/year by measuring squirt height in each zone at the orifice furthest from the pump. Use each pump independently during the monitoring to ensure each pump is functioning.
(D) Facilities which chlorinate for disinfection shall perform total chlorine residual analyses of the effluent on a daily (Monday - Friday) basis during those periods when chlorination facilities are in use.(E) Facilities employing disinfection technology other than chlorine shall have disinfection process control testing parameters and frequency determined by the department on a case-by-case basis.(6) Laboratory procedures shall be performed in accordance with 10 CSR 20-7.015. (7) A copy of all reports required by this rule shall be retained by the facility for a minimum of three (3) years. AUTHORITY: section 644.026, RSMo, Supp. 1997.* Original rule filed July 15, 1976, effective 7/1/1977. Amended: Filed Nov. 1, 1983, effective 7/1/1984. Amended: Filed July 29, 1994, effective 3/30/1995. Amended: Filed Nov. 3, 1997, effective 7/30/1998. "Original authority 1972, amended 1973, 1987, 1993, 1995.Amended by Missouri Register January 2, 2019/Volume 44, Number 1, effective 2/28/2019