Part 2 of 2 on Time Impact Analysis (TIA) of Adverse Weather Delay Days in Cost-Loaded Network Analysis Schedules (NAS)
Cost-Loaded Network Analysis Schedules (NAS) for construction using Oracle Primavera P6
The United Facilities Guide Specifications (UFGS) UFGS-01 32 17.05 20, Section 01 32 17.05 20, Cost-Loaded Network Analysis Schedules (NAS) for Design-Build (DB) guide specification applies to Design-Build projects and covers the preparation and use of Cost-Loaded Network Analysis Schedules (NAS) for construction using Oracle Primavera P6. The specification section applies to construction projects with multiple disciplines working simultaneously during multiple phases with critical completion dates for handover to the owner.
Excusable delay for weather — time will not be compensable
1.8 Contract Modification requires the contactor to “…submit a Time Impact Analysis (TIA) with each cost and time proposal for a proposed change. TIA must illustrate the influence of each change or delay on the Contract Completion Date or milestones…” Further, each Time Impact Analysis (TIA) must be submitted to the owner in both narrative and schedule form. The contractor must identify the type of the delay, such as an excusable delay for weather — where the contractor may receive a time extension, but time will not be compensable.
Time extension for adverse weather delay days
After the Time Impact Analysis (TIA) is submitted to the owner in both narrative and schedule form, the contracting officer may isssue a modification in accordance with the contract clauses, granting the contractor a time extension for adverse weather delay days — but time will not be compensable. Time extension is the difference between the anticipated number of adverse weather delay days and the actual number of adverse weather delay days for the given month, if the actual number of days is greater than the anticipated number of days.
Adverse weather delayed activities are critical to the contract completion
The contractor must also demonstrate that the “…adverse weather delayed activities are critical to the contract completion…” In critical path method (CPM) scheduling, critical path analysis helps to demonstrate both the project duration and the finish date of the project schedule and of the contract completion. The Project Management Body of Knowledge (PMBOK) defines the critical path as “the sequence of scheduled activities that determines the duration of the project” — the longest path of the network diagram in Oracle Primavera P6.
Cannot work at least 50 percent of the day on the impacted activity
Cost-Loaded Network Analysis Schedules (NAS) for Design-Build (DB) guide specification also defines a lost workday due to weather conditions as “…a day in which the Contractor cannot work at least 50 percent of the day on the impacted activity…” Accordingly, Time Impact Analysis (TIA) must also illustrate either that the adverse weather occurred for greater than half of the scheduled workday or the adverse weather impacted the schedule activity for greater than half of the scheduled workday, at least 4-hours in an 8-hour work shift.
Drying day or dry out day, a workday immediately following rainfall ≥ 1.0”
For example, a high intensity rain event occurring during a 3-hour time period from 7am to 10am on a scheduled workday impacted earth moving, excavation and trenching schedule activities, equipment operations and work results, and then after the rain event finished, subsequently required a full 8-hour workday as a “drying day” or “dry out day,” a workday immediately following rainfall ≥ 1.0” due to waterlogged ground and unstable earth.
More in the next blog post about weather decision support, weather safety and weather risk management…
Unified Facilities Guide Specifications (UFGS) are a joint effort of the U.S. Army Corps of Engineers (USACE), the Naval Facilities Engineering Command (NAVFAC), the Air Force Civil Engineer Center (HQ AFCEC) and the National Aeronautics and Space Administration (NASA). UFGS are for use in specifying construction for the military services. (Source: https://www.wbdg.org/ffc/dod/unified-facilities-guide-specifications-ufgs)
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