Metal and Diamond Mining Effluent Regulations

13 (1) Despite section 12 and subject to subsection (3), the owner or operator of a mine may reduce the frequency of testing for a deleterious substance that is set out in any of items 1 to 6 of Schedule 4 to not less than once in each calendar quarter if that substance’s monthly mean concentration in the effluent is less than 10% of the value set out in column 2 of that Schedule for the 12 months immediately preceding the most recent test.

(2) Despite section 12 and subject to subsection (3), the owner or operator of a mine, other than an uranium mine, may reduce the frequency of testing for Radium 226 set out as item 8 of Schedule 4 to not less than once in each calendar quarter if that substance’s concentration in the effluent is less than 0.037 Bq/L in 10 consecutive tests conducted under section 12.

(3) The owner or operator shall increase the frequency of testing to that prescribed in section 12 for a deleterious substance that is set out in any of items 1 to 6 or 8 of Schedule 4 if the substance’s monthly mean concentration is equal to or greater than 10% of the value set out in column 2 of these items.