Wastewater Systems Effluent Regulations

Interpretation

• Marginal note:Definitions

  1 The following definitions apply in this Schedule.

  bulk flow ratio

  bulk flow ratio means the ratio of the average rate of flow of a watercourse during a year to the average rate of flow of effluent that is deposited in that watercourse during that year. (coefficient de débit brut)

  marine port waters

  marine port waters means well-flushed marine waters, such as a sea port or harbour. (eaux d’un port maritime)

  open marine waters

  open marine waters, in relation to a final discharge point, means salt waters in an area defined by an arc of 135° extending 20 km from the point of entry in relation to the final discharge point, if there is no land within that area. (eaux libres en milieu marin)

  Item	Column 1	Column 2	Column 3
  	Conditions and Water	Criteria	Points
  1	Average daily volume of effluent, expressed in m3, deposited during the period of 12 consecutive months referred to in subsection 24(1) of these Regulations upon which the application is based	(a) ≤ 500	5 points
  		(b) > 500 and ≤ 2 500	10 points
  		(c) > 2 500 and ≤ 17 500	15 points
  		(d) > 17 500 and ≤ 50 000	25 points
  		(e) > 50 000	35 points
  2	The average carbonaceous biochemical oxygen demand (CBODA) due to the quantity of CBOD matter in the effluent and the average concentration of suspended solids (SSA) in the effluent, both expressed in mg/L, during the period of 12 consecutive months referred to in subsection 24(1) of these Regulations upon which the application is based	(CBODA + SSA)/5	points as per formula in column 2
  3	If, during the period of 12 consecutive months referred to in subsection 24(1) of these Regulations upon which the application is based, chlorine, or one of its compounds, was used in the treatment of wastewater in the wastewater system, as applicable, paragraph (a) or (b) of Column 2	(a) average concentration of total residual chlorine in the effluent deposited via the final discharge point is > 0.02 mg/L	10 points
  		(b) effluent is not dechlorinated before it is deposited	10 points
  4	The maximum concentration of un-ionized ammonia, expressed in mg/L as nitrogen (N), in the effluent deposited during the period of 12 consecutive months referred to in subsection 24(1) of these Regulations upon which the application is based	≥ 1.25 at 15°C ± 1°C	20 points
  5	Water where effluent is deposited via the final discharge point (highest value that applies)	(a) open marine waters	5 points
  		(b) marine port waters	10 points
  		(c) lake, natural wetland, reservoir, estuary, enclosed bay	20 points
  		(d) watercourse with bulk flow ratio >100	15 points
  		(e) watercourse with bulk flow ratio ≥10 and ≤100	20 points
  		(f) watercourse with bulk flow ratio <10	25 points
  		(g) shellfish harvesting area within 500 m of the point of entry where effluent is deposited in the water via the final discharge point	20 points