1. The geomembrane used as part of a landfilling site’s primary liner may be assumed to have a service life of 150 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 geomembrane must be made of high density polyethylene (HDPE) and must have a thickness of at least 1.5 millimetres. 2. The oxidative induction time of the geomembrane must exceed, i. 100 minutes, as determined by ASTM D3895-95 (American Society for Testing and Materials Standard Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry), as it may be amended from time to time, or ii. 250 minutes, as determined by ASTM D5885-95 (American Society for Testing and Materials Standard Test Method for Oxidative-Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry), as it may be amended from time to time. 3. The oxidative induction time of the geomembrane after oven aging at 85 degrees Celsius for 90 days, as described in ASTM D5721-95 (American Society for Testing and Materials Standard Practice for Air-Oven Aging of Polyolefin Geomembranes), as it may be amended from time to time, must exceed, i. 80 per cent of the value for the original geomembrane, as determined by ASTM D3895-95 (American Society for Testing and Materials Standard Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry), as it may be amended from time to time, or ii. 80 per cent of the value for the original geomembrane, as determined by ASTM D5885-95 (American Society for Testing and Materials Standard Test Method for Oxidative-Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry), as it may be amended from time to time. 4. The geomembrane must be installed in direct and uniform contact with a suitable foundation or clayey liner. 5. The geomembrane must be protected against puncturing and load-induced damage at all times, including during installation. 6. During installation, care must be taken to, i. remove wrinkles in the geomembrane, ii. minimize stress concentration, iii. ensure high quality seams, iv. minimize differential settlement, v. minimize exposure to ultraviolet light, vi. prevent damage due to sliding, vii. prevent damage due to installation in cold conditions, and viii. prevent damage due to rodents. Secondary Liner — 350-Year Service Life

2. The geomembrane used as part of a landfilling site’s secondary liner may be assumed to have a service life of 350 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 150-year service life are met with the following change: 1. The requirement that the geomembrane have a thickness of at least 1.5 millimetres is changed to a requirement that the geomembrane have a thickness of at least 2.0 millimetres. O. Reg. 232/98, Sched. 3; O. Reg. 483/98, s. 1. Schedule 4   SERVICE LIVES — COMPACTED CLAYEY LINERS (Sections 6 and 10) Unlimited Service Life

1. A landfilling site’s compacted clayey liner may be assumed to have an unlimited service life if the following conditions are met: 1. The liner must be, i. at least 0.75 metres thick and compacted in at least five lifts, or ii. at least 0.6 metres thick and compacted in at least four lifts, if the liner is not constructed over a leachate collection system and is not used in conjunction with a geomembrane as part of a composite liner. 2. Each of the lifts in which the liner is compacted must be not more than 0.15 metres in compacted thickness. 3. Appropriate mineralogical studies or other leachate compatibility studies must indicate that the clayey material is not likely to experience a significant increase in hydraulic conductivity due to interaction with leachate. 4. During installation, care must be taken to, i. control soil properties and water content, ii. ensure the breakup of clods, iii. control lift thickness and compaction, iv. remove stones larger than 100 millimetres, v. prevent desiccation of the compacted clayey liner, vi. prevent damage to the compacted clayey liner due to freezing, vii. prevent damage to the compacted clayey liner from vehicular traffic, viii. prevent damage to the compacted clayey liner due to rodents, and ix. prevent damage to the compacted clayey liner due to differential settlement. 5. The report of a suitably qualified geotechnical engineer must confirm that there is no evident cracking in the constructed liner or significant occurrence of clods, stones, branches or other material that could shorten the service life of the constructed liner or significantly increase the hydraulic conductivity. O. Reg. 232/98, Sched. 4.