2. A landfilling site’s primary leachate collection system, consisting of perforated collection pipes bedded in a layer of stones with a separating layer above and below the stones, may be assumed to have a service life of 75 years, starting at the earlier of the mid-point of the site’s operating life and the tenth anniversary of the first deposit of waste in the waste fill zone, if all of the conditions set out above for a 100-year service life are met with the following changes: 1. The requirement that the layer of stones in which the pipes are bedded have a minimum thickness of 0.5 metres elsewhere than the base side slopes is changed to a requirement that the layer have a minimum thickness of 0.3 metres elsewhere than the base side slopes. 2. The requirement that the perforated leachate collection pipes be bedded in the stones so that there is at least 250 millimetres of stones above the pipes and at least 50 millimetres of stones below the pipes must be met, but local thickening of the layer of stones is acceptable. 3. The requirement that the perforated leachate collection pipes be spaced so that the drainage path before leachate can potentially intercept a collection pipe is not more than 50 metres in length is changed to a requirement that the pipes be spaced so that the drainage path before leachate can potentially intercept a collection pipe is not more than 25 metres in length. 60-Year Service Life

3. A landfilling site’s primary leachate collection system, consisting of perforated collection pipes bedded in a layer of stones with a separating layer above and below the stones, may be assumed to have a service life of 60 years, starting at the earlier of the mid-point of the site’s operating life and the tenth anniversary of the first deposit of waste in the waste fill zone, if all of the conditions set out above for a 100-year service life are met with the following changes: 1. The requirement that the layer of stones in which the pipes are bedded have a minimum thickness of 0.5 metres elsewhere than the base side slopes is changed to a requirement that the layer have a minimum thickness of 0.3 metres elsewhere than the base side slopes. 2. The requirement that the perforated leachate collection pipes be bedded in the stones so that there is at least 250 millimetres of stones above the pipes and at least 50 millimetres of stones below the pipes must be met, but local thickening of the layer of stones is acceptable.

4. In this Schedule, (a) D85 for stones in a stone layer is the stone diameter such that, when measured by weight, 85 per cent of the stones in the layer have a smaller diameter; (b) D60 for stones in a stone layer is the stone diameter such that, when measured by weight, 60 per cent of the stones in the layer have a smaller diameter; and (c) D10 for stones in a stone layer is the stone diameter such that, when measured by weight, 10 per cent of the stones in the layer have a smaller diameter. O. Reg. 232/98, Sched. 1. Schedule 2   SERVICE LIVES — SECONDARY LEACHATE COLLECTION SYSTEMS (Sections 6 and 10) 1,000-Year Service Life

1. A landfilling site’s secondary leachate collection system, consisting of perforated collection pipes bedded in a layer of stones with a separating layer above and below the stones, may be assumed to have a service life of 1,000 years, starting at the earlier of the mid-point of the site’s operating life and the tenth anniversary of the first deposit of waste in the waste fill zone, if the following conditions are met: 1. The pipes must be bedded in a continuous layer of stones that extends completely across the base of the waste fill zone, including the base side slopes, and that has a minimum thickness of 0.3 metres.  The stones must have a D85 of not less than 37 millimetres, a D10 of not less than 19 millimetres, a uniformity coefficient (D60/D10) of less than 2.0, and, when measured by weight, not more than 1.0 per cent of the stones may pass the US #200 sieve. 2. A suitable geotextile or graded granular separator must be installed between the stone layer and any underlying soil or liner and between the stone layer and any overlying material. 3. The perforated leachate collection pipes must be made of high density polyethylene (HDPE), with a minimum internal diameter of 150 millimetres and with perforations not less than 12 millimetres in diameter located along and around the pipes so that, i. the hydraulic capacity of the perforations can readily accommodate the expected quantity of leachate, ii. leachate that enters the pipes can readily flow within the pipes, iii. blockage by sedimentation is minimized, and iv. the structural integrity of the pipes is maintained. 4. The perforated leachate collection pipes must be bedded in the stones so that there is at least 250 millimetres of stones above the pipes and at least 50 millimetres of stones below the pipes.  Local thickening of the layer of stones is acceptable. 5. The perforated leachate collection pipes must be placed across the base of the waste fill zone, excluding the base side slopes, and spaced so that the drainage path before leachate can potentially intercept a collection pipe is not more than 100 metres in length. 6. The leachate collection pipes must have adequate structural integrity to withstand impacts from waste placement and other site operations and to withstand the weight of the waste, cover material and any structures that may be located over them. 7. Leachate collection pipes must be inspected at least annually for the first five years after the initial production of leachate from the secondary leachate collection system and then as often as future inspections indicate to be necessary. 8. Leachate collection pipes must be cleaned whenever an inspection indicates that cleaning is necessary. 9. Leachate must be removed from the collection system in order to avoid obstructions to leachate flows within the system. 10. The base of the waste fill zone must be contoured to provide minimum surface grades of 0.5 per cent toward the leachate collection pipes.

2. In this Schedule, (a) D85 for stones in a stone layer is the stone diameter such that, when measured by weight, 85 per cent of the stones in the layer have a smaller diameter; (b) D60 for stones in a stone layer is the stone diameter such that, when measured by weight, 60 per cent of the stones in the layer have a smaller diameter; and (c) D10 for stones in a stone layer is the stone diameter such that, when measured by weight, 10 per cent of the stones in the layer have a smaller diameter. O. Reg. 232/98, Sched. 2. Schedule 3   SERVICE LIVES — GEOMEMBRANE LINERS (Sections 6 and 10) Primary Liner — 150-Year Service Life