SOLID WASTE PROCESSING AND DISPOSAL
Rule 1200-01-07-.04, continued)
Placed upon a foundation or base capable of providing support to the liner and resistance to pressure gradients above and below the liner to prevent failure of the liner due to settlement, compression, or uplift;
Installed to cover all surrounding earth likely to be in contact with the waste or leachate;
Of sufficient strength and durability to function for the life of the facility plus the post-closure care period; and
Sloped such that, excluding excavation side slopes, the slope of the liner shall not exceed 25%.
Underlying the liners shall be a geologic buffer which shall have:
A maximum hydraulic conductivity of 1.0 x 10-5 cm/s and measures at least ten (10) feet from the bottom of the liner to the seasonal high water table of the uppermost unconfined aquifer or the top of the formation of a confined aquifer or
Have a maximum hydraulic conductivity of 1.0 x 10-6 cm/s and measures not less than five (5) feet from the bottom of the liner to the seasonal high water table of the uppermost unconfined aquifer or the top of the formation of a confined aquifer or
Other equivalent or superior protection as defined in (ii) of this subpart.
The compacted soil component of the composite liner shall be as follows:
The compacted soil liners shall be free of sharp objects and be compatible with supporting soils and with leachate expected to be generated.
Admixtures (i.e., cement, bentonite, etc.) and special construction techniques may be used to improve the properties of the compacted soil liner provided that:
In no case shall the liner thickness be less than two (2) feet;
The modified liner shall achieve equivalent or superior performance to requirements of the minimum performance standard as described in this subparagraph.
Alternate liner designs may be used provided that:
It is demonstrated to the satisfaction of the Commissioner that the liner design provides equivalent or superior performance to the minimum performance standard for a Class I facility as described in this subparagraph, and
When approving a design the Commissioner, shall consider at least the following factors:
The hydrogeologic land;
The climatic factors of the area; and
May, 2010 (Revised)