Q-2, r. 34.1 - Regulation respecting municipal wastewater treatment works

Schedule Disposition versions

2014-01-11

SCHEDULE I

(s. 6)

ASSESSMENT OF COMPLIANCE WITH DISCHARGE STANDARDS OF THE EFFLUENT FROM A TREATMENT PLANT

(1) Compliance with the standards relating to CBOD5 and SS provided for in subparagraphs 1 and 2 of the first paragraph of section 6 is assessed by collecting samples of the effluent from a treatment plant at the frequencies appearing in Table 1, according to the class of treatment plant concerned.

(2) All the samples collected must be analyzed by laboratories accredited under section 118.6 of the Environment Quality Act (chapter Q-2).

(3) The results of the analyses of samples collected are compiled in a manner to establish an average of those results for the periods appearing in Table 1, according to the class of treatment plant concerned.

(4) The laboratory produces a certificate of analysis which is sent to the operator of the treatment plant concerned.

(5) Compliance with the standards relating to pH provided for in subparagraph 3 of the first paragraph of section 6 is assessed by taking one-time measurements of the effluent from a treatment plant at the frequencies appearing in Table 1, according to the class of treatment plant concerned.

(6) The pH measurements are taken using a measuring device able to assess the pH with a precision to the tenth of a unit.

(7) The samples collected and the measurements taken during the period of periodic emptying of a treatment plant of the non-aerated lagoon type, regardless of the class of treatment plant to which it belongs, must be done after the first third and after the second third of each of the emptying periods.

(8) The frequencies and the calculation periods of the averages provided for in Table 1 do not apply if the operator of a treatment plant is the holder of a depollution attestation issued under section 31.33 of the Environment Quality Act and that attestation provides different frequencies and periods of calculation to ensure stricter periodic monitoring than that provided for in Table 1.

Table 1

Minimum monitoring of compliance with discharge standards

Class of treatment                         Sampling frequency        Period for the
plant                                                                calculation of
                                                                        averages   
                                                                    (CBOD5 and SS)*

Very small:

- Plant of the “lagoon” type                    Monthly                 Annual    

- Plant whose 
average flow rate is 
less than 100 m3 per day                        Monthly                 Annual  

- Other types of plant                          Monthly                Quarterly   

Small:

- Plant of the “lagoon” type                    Monthly                 Annual

Other types of plant                            Monthly                Quarterly

Medium                                       Every  2 weeks            Quarterly

Large                                           Weekly                  Monthly    

Very large:

- Plant of the “lagoon” type                 3 days a week              Monthly

Other types of plant                         5 days a week              Monthly

* To verify compliance of the discharge standards related to CBOD5 and SS, the average must be calculated from all the results obtained, even if the number of those results is higher than what is required in the table.

O.C. 1305-2013, Sch. I.