SECTION 252:515-11-35. Construction

(a)   Internal side slopes. The internal side slopes of disposal areas to be lined with an FML must be no steeper than 3:1 unless slope stability calculations support an alternative design.

(b)   Moisture content. If it is necessary to moisten the soil to meet the requirements of 252:515-11-33(6), the water shall be distributed equally throughout the lift. Moisture tests shall be performed after the water has absorbed into the clay.

(c)   Placement and compaction. The liner shall be constructed in the following manner:

(1)   scarify the surface on which the lift is to be placed to a nominal depth of approximately one inch;

(2)   place a lift of soil at a loose depth of nine inches (9") or less;

(3)   compact and remold the lift to a depth of six inches (6") or less with a heavy-footed roller equipped with feet that fully penetrate the loose lift of soil;

(4)   remove all rocks, cobbles, roots and other foreign objects over one inch in diameter, as well as all surface rocks regardless of size if an FML is to be laid;

(5)   inspect for flaws, cracks and other defects; and

(6)   make needed repairs.

[Source: Added at 20 Ok Reg 1151, eff 6-1-03]