Common use of Liners Clause in Contracts

Liners. 1. If geotechnical testing confirms the need for a liner, acceptable options include one of the following and shall be approved by the Engineer for use: (a) six to 12 inches of clay soil that meets the specifications below, (b) a 30 mm poly-liner, (c) bentonite, (d) use of chemical additives, or (e) a design prepared by a professional engineer registered in the state of Georgia. Permeability ASTM D-2434 cm/sec 1X 10–6 Plasticity Index of Clay ASTM D-423/424 % Not less than 15 Liquid Limit of Clay ASTM D-2216 % Not less than 30 Clay Particles Passing ASTM D-422 % Not less than 30 Clay Compaction ASTM D-2216 % 95% of standard ▇▇▇▇▇▇▇ density 2. For wet detention ponds designed to have a clay liner, 4” of topsoil shall be added to the top of the clay liner. The topsoil may be amended organic material in order to support plant growth depending on the soil analysis. If a geosynthetic liner is used to reduce exfiltration from the wet detention pond, a minimum of 1 foot of soil shall separate the geosynthetic liner from the planting surface.

Liners. 1. If geotechnical testing confirms the need for a liner, acceptable options include one of the following and shall be approved by the Engineer for use: (a) six to 12 inches of clay soil that meets the specifications below, (b) a 30 mm poly-liner, (c) bentonite, (d) use of chemical additives, or (e) a design prepared by a professional engineer registered in the state of Georgia. Permeability ASTM D-2434 cm/sec 1X 1 10–6 Plasticity Index of Clay ASTM D-423/424 % Not less than 15 Liquid Limit of Clay ASTM D-2216 % Not less than 30 Clay Particles Passing ASTM D-422 % Not less than 30 Clay Compaction ASTM D-2216 % 95% of standard ▇▇▇▇▇▇▇ density 2. For wet detention ponds designed to have a clay liner, 4” of topsoil soil shall be added to the top of the clay liner. The topsoil soil may be amended organic material in order to support plant growth depending on the soil analysis. If a geosynthetic liner is used to reduce exfiltration from the wet detention pond, a minimum of 1 foot of soil shall separate the geosynthetic liner from the planting surface.