PURPOSE: This regulation sets forth the minimum requirements for laboratory testing to ensure adequate wastewater treatment systems operation.

1. (1) Definitions. Definitions as set forth in the Missouri Clean Water Law and 10 CSR 20- 2.010 shall apply to the terms to be used in this rule, unless the context clearly requires otherwise.
2. (2) Operational laboratory tests and related monitoring for wastewater treatment systems control shall be considered as a supplement to the National Pollutant Discharge Elimination System (NPDES) permit requirements. These monitoring reports to the department shall accompany NPDES discharge monitoring reports and shall be submitted at the frequency specified for NPDES discharge monitoring report submittal.
3. (3) The department may modify required monitoring frequency required in this rule based upon the department’s judgement of monitoring needs for process control at a specified facility.
4. (4) These requirements for laboratory tests shall apply to all wastewater 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, servicing population equivalents greater than two hundred (200) or with twenty-five (25) or more service connections. All other systems are exempt.

5. (5) Minimum monitoring requirements to ensure adequate wastewater treatment systems in-plant operational control are as follows:

   1. (A) Lagoons (All Types) Two (2)/Week Frequency. Weather Conditions—Ambient temperature, cloud cover and precipitation Flow Influent or Effluent pH Primary Cell D.O. Primary Cell

   2. (B) Mechanical Plants.

      1. 1. All types—daily frequency.

Weather Conditions—Ambient temperature

Flow pH 2. Additional laboratory test require-

ments for wastewater activated sludge processes and modifications: Influent NFR 1/week

Settleability

D.O.

1. 3. Facilities having digesters shall perform the following additional laboratory tests:

   Anaerobic

pH Temperature

D.O. (C) Facilities which chlorinate for disin-

fection shall perform total chlorine residual analyses of the effluent on a daily basis during those periods when chlorination facilities are in use.

1. (D) 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.

1. (6) Laboratory procedures shall be performed according to the most current edition of Standard Methods for the Examination of Water and Wastewater or other methods approved by the department.
2. (7) All owners of wastewater facilities operated by or for municipalities, sewer and water districts or Public Service Commission

3. (PSC) regulated sewer companies may complete a self-analysis of the wastewater utility each calendar year utilizing the Missouri Municipal Water Pollution Prevention (MWPP) survey forms supplied by the department. Participation in this program is voluntary. For owners who have submitted an MWPP survey for the last five (5) consecutive calendar years; or for owners who have submitted an MWPP survey for every calendar year since the inception of the program, the department will—

   1. (A) Not impose administrative penalties until the process of conference, conciliation and persuasion (CC&P) as per 10 CSR 20- 3.010 plus at least one (1) additional communication separated by at least ten (10) days and precipitation Influent or Effluent Influent

      Mixed Liquor

1/week (sample reaeration basin for contact stabilization) Daily (sample contact and reaeration basins for contact stabilization) Daily (sample contact and reaeration basins for contact stabilization)

Aerobic

Daily — Daily — (if heated) Daily 10 CSR 20-9

from other communications are completed by the department; and

1. (B) Reduce any base penalty calculated as per 10 CSR 20-3.010(8)(B)6. by up to onethird (1/3) of the amount between the midpoint and least figure of the penalty range.

1. (8) A copy of all reports required by this rule shall be retained by the facility for a minimum of three (3) years.
2. (9) Penalties. Penalties for violation of this rule shall be as provided in the Missouri Clean Water Law.
3. (10) Severance. If a section, subsection, paragraph, subparagraph, part or subpart of these rules or any part of them be declared unconstitutional or invalid for any reason, the remainder of these rules shall not be affected and shall remain in full force and effect.
4. (11) Effective Date. This rule becomes effective July 1, 1977, after adoption and compliance with the requirements of section 644.036.3. of the Missouri Clean Water Law and Chapter 536, RSMo.

AUTHORITY: section 644.026, RSMo, Supp. 1997.* Original rule filed July 15, 1976, effective July 1, 1977. Amended: Filed Nov. 1, 1983, effective July 1, 1984. Amended: Filed July 29, 1994, effective March 30, 1995. Amended: Filed Nov. 3, 1997, effective July 30, 1998. *Original authority 1972, amended 1973, 1987, 1993, 1995.