1. (a) Soil liners shall meet or exceed the following specifications:

   1. (1) The liner shall be constructed of no less than 3 feet of a recompacted natural soil with uniform and consistent characteristics, or a uniform and consistent natural soil blended with an admixture, such as bentonite;
   2. (2) The liner shall be free from stones greater than one inch in diameter and stones having a sharp or angular surface;
   3. (3) Recompaction shall occur in lifts not to exceed the depth demonstrated in a test pad necessary to achieve a saturated hydraulic conductivity no greater than 1 x 10-7 cm/sec;
   4. (4) The recompacted lifts shall be constructed in a step-wise manner to limit the potential for vertical channeling;
   5. (5) Recompacted saturated hydraulic conductivity shall equal 1 x 10-7 cm/sec or less; and
   6. (6) The liner shall be protected from damage due to frost, desiccation, and differential movement.

2. (b) Geomembrane liners shall meet or exceed the following specifications:

   1. (1) The liner material shall have a minimum thickness of 60 mils;
   2. (2) The liner material shall be chemically compatible with anticipated waste and leachate characteristics; and
   3. (3) Seaming methods which involve the use of solvents shall incorporate quality assurance/quality control procedures pursuant to Env-Sw 805.16 to assure protection of groundwater and surface water resources.

3. (c) Composite liners shall consist of:

   1. (1) A geomembrane liner, as specified by (b) above; and
   2. (2) A soil component as specified by (a) above or a manufactured geosynthetic clay liner (GCL).
4. (d) All liners shall be constructed in accordance with a quality assurance/quality control plan established pursuant to Env-Sw 805.16.

Source. #5172, eff 7-1-91; ss by #6535, INTERIM, eff 7-1-97, EXPIRES: 10-29-97; ss by #6619-B, eff 10-29-97; (See Revision Note at chapter heading for Env-Sw 800); ss by #8459, eff 10-28-05 (formerly Env-Wm 2505.04); ss by #10597, eff 7-1-14; ss by #14156, eff 12-21-24