SEARCH Articles Figures Tables Design a Work Permit System National Pollution Discharge Elimination System , permits program National Pollution Discharge Elimination System permit Permit systems Permit systems Confined Space Entry Permit systems functions Permit systems requirements Permit systems types Permit-to-Work system Permit-to-Work system entry into confined space Permit-to-work system checklist Permits Permitting Plant permit system Procedures permit systems The Permit System The permit-to-work system