18. (1) Despite sections 19 to 27, a discharger need not collect samples from any stream at the discharger’s plant on a day on which there is no discharge from any non-event process effluent stream, event process effluent stream or building effluent stream at the plant. (2) Where a discharger is required by this Regulation to pick up a set of samples and analyze it for certain parameters, the discharger shall pick up a set of samples sufficient to allow all the analyses to be performed. (3) A discharger shall use all reasonable efforts to ensure that all analyses required by this Regulation are completed as soon as reasonably possible and that the results of those analyses are made available to the discharger as soon as reasonably possible. (4) Subject to subsection (5), each discharger shall pick up all sets of samples required to be picked up at the discharger’s plant under sections 19, 20, 23 and 27 between the hours of 9 a.m. and 12 noon. (5) If the Director is satisfied, on the basis of written submissions from a discharger, that the circumstances at the discharger’s plant are such that it would be impractical to pick up a set of samples from each sampling point established at the plant under this Regulation within the time period specified in subsection (4), the Director may give the discharger a written notice in respect of the plant, varying the time period specified in subsection (4). (6) Subject to subsections (7) and (8), where a discharger is required by section 19, 20, 23 or 27 to pick up a set of samples, the discharger shall pick up a set collected over the 24-hour period immediately preceding the pick up. (7) The 24-hour period referred to in subsection (6) may be shortened or enlarged by up to three hours to permit a discharger to take advantage of the three-hour range specified in subsection (4) or of a different three-hour period specified in a notice under subsection (5). (8) Where a notice has been given under subsection (5) in respect of a plant specifying a time period longer than three hours, the 24-hour period referred to in subsection (6) may be shortened or enlarged by up to that longer amount of time to permit the discharger to take advantage of the time period specified in the notice. (9) If the circumstances at a plant change so that the Director is satisfied that the circumstances described in subsection (5) no longer apply at the plant, the Director may revoke a notice given in respect of a plant under subsection (5) by giving a notice of revocation in writing to a discharger for the plant.  O. Reg. 215/95, s. 18. Monitoring — Non-event Process Effluent — Daily

19. (1) Subject to subsections (2) to (4), each discharger shall, on each day, pick up a set of samples collected from each non-event process effluent monitoring stream at the discharger’s plant and shall analyze each set of samples for the parameters for which the frequency of monitoring, as set out in Column 3 of the Table for the discharger’s plant in Schedule 2 for the type of non-event process effluent stream, is daily. O. Reg. 310/17, s. 3 (1). (2) Subsections (3) and (4) apply only to the Lakeview Thermal Generating Station, Lambton Thermal Generating Station and Nanticoke Thermal Generating Station. (3) Subsection (1) does not apply to non-event process effluent streams of the types described in paragraphs 4 and 5 of subsection 1 (2) until April 13, 1998. (4) Beginning on April 14, 1997, each discharger shall, on each day, pick up a set of samples collected from one stream at the discharger’s plant of a type described in paragraph 4 or 5 of subsection 1 (2) and shall analyze each set of samples for the parameters for which the frequency of monitoring, as set out in Column 3 of the Table for the discharger’s plant in Schedule 2 for the type of non-event process effluent stream, is daily. O. Reg. 310/17, s. 3 (2). (5) A discharger need not meet the requirements of subsections (1) and (4) where it is impossible to do so because of sampling by a provincial officer.  O. Reg. 215/95, s. 19. Monitoring — Non-event Process Effluent — Weekly

20. (1) Subject to subsections (2) to (5), each discharger shall, on one day in each week, pick up a set of samples collected from each non-event process effluent monitoring stream at the discharger’s plant and shall analyze each set of samples for the parameters for which the frequency of monitoring, as set out in Column 3 of the Table for the discharger’s plant in Schedule 2 for the type of non-event process effluent stream, is weekly. O. Reg. 310/17, s. 4 (1). (2) Despite subsection (1), a discharger need not analyze a sample collected from a stream to which subsection 16 (3) applies for a parameter listed in subsection 16 (3). (3) Subsections (4) and (5) apply only to the Lakeview Thermal Generating Station, Lambton Thermal Generating Station and Nanticoke Thermal Generating Station. (4) Subsection (1) does not apply to non-event process effluent streams of the types described in paragraphs 4 and 5 of subsection 1 (2) until April 13, 1998. (5) Beginning on April 14, 1997, each discharger shall, on one day in each week, pick up a set of samples collected from one stream at the discharger’s plant of a type described in paragraph 4 or 5 of subsection 1 (2) and shall analyze each set of samples for the parameters for which the frequency of monitoring, as set out in Column 3 of the Table for the discharger’s plant in Schedule 2 for the type of non-event process effluent stream, is weekly. O. Reg. 310/17, s. 4 (2). (6) There shall be an interval of at least four days between successive pick up days at the plant under subsection (1). (7) All samples picked up under subsections (1) and (5) in a week shall be picked up on the same day in the week.  O. Reg. 215/95, s. 20. Monitoring — Event Process Effluent — Daily and Weekly