21. (1) Each discharger shall, in each 24-hour period ending at noon, pick up a set of samples collected from each 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 3 for the type of event process effluent stream, is daily. O. Reg. 310/17, s. 5 (1). (2) A set of samples collected at a sampling point under subsection (1) in a 24-hour period ending at noon shall be collected, (a) throughout the entire 24-hour period, where effluent flows past the sampling point throughout the entire 24-hour period; and (b) throughout any portions of the 24-hour period during which effluent flows past the sampling point, where effluent does not flow past the sampling point throughout the entire 24-hour period. (3) Each discharger shall pick up each set of samples collected under subsection (1) during a 24-hour period by the end of that period. (4) A discharger need not meet the requirements of subsections (1) to (3) where it is impossible to do so because of sampling by a provincial officer. (5) Subsections (1) to (3) do not apply in relation to, (a) a sampling point on an event process effluent monitoring stream of a type described in paragraph 1 of subsection 1 (3) at the Lambton Thermal Generating Station; or (b) a sampling point on an event process effluent monitoring stream of a type described in paragraph 2 of subsection 1 (3). (6) Each discharger shall, during each discharge at the discharger’s plant of effluent from a radioactive liquid waste management system tank at the discharger’s plant into a stream referred to in clause (5) (b), collect a grab sample from the sampling point on the stream. (7) Instead of collecting a grab sample from a sampling point during a discharge as required by subsection (6), a discharger may collect a grab sample from the tank immediately before the discharge. (8) A discharger shall combine all grab samples collected during each 24-hour period ending at noon at the discharger’s plant under subsections (6) and (7), in proportion to the volumes of the discharges in respect of which the grab samples were collected, and shall immediately pick up the combined sample. (9) For the purposes of subsections (11), (12), (14) and (19), where only one grab sample is collected at a discharger’s plant under subsections (6) and (7) during a 24-hour period ending at noon, the single grab sample shall be deemed to be a combined sample prepared under subsection (8). (10) A discharger shall pick up a single grab sample to which subsection (9) applies by noon of the 24-hour period. (11) Each discharger shall analyze each combined sample prepared under subsection (8) 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 3 for the type of event process effluent stream described in paragraph 2 of subsection 1 (3), is daily. O. Reg. 310/17, s. 5 (2). (12) Once in each week, each discharger shall analyze one combined sample prepared under subsection (8) 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 3 for the type of event process effluent stream described in paragraph 2 of subsection 1 (3), is weekly. O. Reg. 310/17, s. 5 (3). (13) Subsection (12) does not apply to require analysis for the parameter oil and grease. (14) There shall be an interval of at least four full periods of 24 hours ending at noon between pick up times at the plant of the combined samples used for successive weekly analyses under subsection (12). (15) Once in each week, throughout one 24-hour period ending at noon, each discharger shall collect a duplicate sample for each grab sample collected under subsections (6) and (7), shall combine the duplicate grab samples in equal volumes and shall immediately pick up the combined sample. (16) For the purposes of subsection (15), a discharger shall not choose a 24-hour period during which only one grab sample is collected under subsections (6) and (7) at the discharger’s plant. (17) Each discharger shall analyze each combined sample prepared under subsection (15) for the parameter oil and grease. (18) There shall be an interval of at least four full periods of 24 hours ending at noon between pick up times at the plant of the combined samples used for successive analyses under subsection (17). (19) All combined samples picked up under subsection (15) in a week and all combined samples picked up in the week to meet the analysis requirements of subsection (12) shall be picked up on the same day in the week. (20) Each discharger for the Lambton Thermal Generating Station shall, on one day in each week, pick up a grab sample collected from the event process effluent monitoring stream of the type described in paragraph 1 of subsection 1 (3) at the plant and shall analyze each grab sample 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 3 for the type of event process effluent stream described in paragraph 1 of subsection 1 (3), is weekly.  O. Reg. 215/95, s. 21; O. Reg. 310/17, s. 5 (4). Monitoring — Non-event Process Effluent — Quality Control

22. (1) On one day in each year after 1995, on a day on which samples are picked up at the plant under subsection 20 (1), each discharger shall collect and pick up a duplicate sample for each sample picked up on that day under subsection 20 (1) at one non-event process effluent sampling point at the discharger’s plant and shall analyze each duplicate sample 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. 215/95, s. 22 (1); O. Reg. 310/17, s. 6 (1). (2) On one day in each year after 1995, on the day on which samples are picked up at the plant under subsection (1), each discharger shall collect and pick up a duplicate sample for each sample picked up on that day under subsection 20 (1) at one non-event process effluent sampling point at the discharger’s plant and shall analyze each duplicate sample 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. 215/95, s. 22 (2); O. Reg. 310/17, s. 6 (2). (3) In each year, a discharger shall use the same non-event process effluent sampling point for the purposes of subsections (1) and (2).  O. Reg. 215/95, s. 22 (3). (4) Each discharger shall prepare a travelling blank and travelling spiked blank sample for each sample for which a duplicate sample is picked up at the plant under subsection (1) and shall analyze the travelling blank and travelling spiked blank samples in accordance with the directions set out in the Ministry of the Environment publication entitled “Protocol for the Sampling and Analysis of Industrial/Municipal Wastewater”, as amended from time to time.  O. Reg. 240/07, s. 3. (5) There shall be an interval of at least six months between successive pick up days at the plant under subsection (1).  O. Reg. 215/95, s. 22 (5). Monitoring — Non-event and Event Process Effluent — pH Measurement