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19 Table 7. NBI and maintenance operations: culvert. Code Description Operation N Not applicable. Use if structure is not a culvert. 9 No deficiencies. 8 No noticeable or noteworthy deficiencies. 7 Insignificant damage not requiring corrective action. 6 Deterioration or initial disintegration. Repair 5 Moderate to major deterioration or disintegration. Repair 4 Considerable settlement or misalignment. Repair, Replace 3 Severe movement or differential settlement of the segments. Replace 2 Corrective action required to maintain traffic. Emergency 1 Bridge closed. Corrective action may put back in light service. 0 Bridge closed. Replacement necessary. Summary of Maintenance Data and Uses and Administration. For MMS, each module combines diverse inputs on conditions of structures, maintenance actions, finan- Maintenance data include information on resources which cial resources, physical resources, public input/perceptions, are used to compute costs and information on bridge condi- DOT policies, and DOT goals. tions which are used to quantify improvements. Using these data, various evaluations can be made to present the cost and Planning. MMS planning proceeds from maintenance effectiveness of maintenance actions or the scope and accom- needs and feasible actions. MMS may automate the identifi- plishments of maintenance programs. Performance standards cation of some maintenance needs based on the comparisons are derived from maintenance data. of current conditions of structures with target values for con- ditions. Other needs may be based on a desired interval (for Maintenance Management Systems cleaning, etc.) without specific reliance on condition data. MMSs use maintenance data, reports, and evaluations to Programming. MMS composes work programs based on support decisions in maintenance programs. Management maintenance needs, priorities among needs, and constraints functions build upon basic reports and evaluations. Aspects imposed by available resources. Priorities may be based on of maintenance management are reviewed here. condition data available from a BMS database. BMS optimiza- tion routines can be primary sources in formation of mainte- Maintenance Management Modules nance programs. AASHTO guidelines (13) identify six modules for MMS: Resource Management. MMS evaluates needs in fund- Planning, Programming, Resources, Scheduling, Monitoring, ing, labor, equipment, and materials as the aggregate of needs MORIS 711-7431-01, BMS Activity: A743101, Clean/Flush Deck Unit of measurement: Each Bridge ACTIVITY REQUIREMENTS LABOR EQUIPMENT MATERIAL Number Classification Number Type Amount Description 1 Foreman 1 Sweeper Water 2 Crew members 1 Water tank, compressor, hoses 1 Equipment 1 Front end operator loader PRODUCTION UNITS / HR PLANNING UNITS PERFORMANCE STANDARD Bridges / HR 3 Bridges / Day 8 MH / Bridge Figure 2. Performance standard: Pennsylvania DOT (34).