Section 58.01.13.202 - DESIGN CRITERIA FOR PROCESS PONDS01.Engineered Liner System. In addition to meeting the general liner requirements in Subsection 200.06.b., the engineered liner system plans and specifications must provide for all of the following.a. Lower geomembrane liners with a minimum thickness of eighty (80) milli-inches (two point zero (2.0) mm) or equivalent liners approved by the Department.b. Leak detection and collection system that provides material between the lower geomembrane liner and the upper liner system to collect, transport and remove all process water that passes through the upper liner at such a rate as to prevent hydraulic head from developing on the lower geomembrane liner to the level at which it may be reasonably expected to result in leaks through the lower liner system.c. Upper geomembrane liners with a minimum thickness of eighty (80) milli-inches (two point zero (2.0) mm) or equivalent liners approved by the Department.d. Routines and schedules for the evaluation of the efficiency and effectiveness of the removal of process water from the leak collection system. The properly working system will continually relieve head pressures on the lower geomembrane liner.e. Monitoring points that will provide for early detection of any discharge.f. Specific triggers for maintenance routines to address inadequate performance of liner systems.g. Specific operation and maintenance procedures to address inadequate performance of containment or leak detection and collection systems.02.Temporary Containment. Ponds for temporary containment of excess quantities of process water as a result of storm events may be constructed with a single liner if approved by the Department.Idaho Admin. Code r. 58.01.13.202