The upper six inches of the surface on which the liner is to be placed must be compacted to a minimum standard proctor density (ASTM D698) of 90%.
Okla. Admin. Code § 252:515-11-34
The upper six inches of the surface on which the liner is to be placed must be compacted to a minimum standard proctor density (ASTM D698) of 90%.
Okla. Admin. Code § 252:515-11-34