Department of Energy Office of Inspector General Bechtel National, Inc.'s Cost Proposal Estimates for Baseline Change Proposal 02 and Its Contract Modification 384 Counterpart for the Waste Treatment and Immobilization Plant (DOE-OIG-23-34) What Did the OIG Find? We found that Bechtel did not utilize reasonable cost proposal estimates for baseline change proposal 02 and its contract modification 384 counterpart at the Waste Treatment and Immobilization Plant. First, Bechtel did not always use adequate estimating practices. Second, Bechtel was unable to reconcile management reserve amounts to identified risks and demonstrate how estimates reconciled to the Risk Management Plan. Finally, Bechtel's use of its Monte Carlo simulation was not consistent with industry practice, which resulted in overstated hours and costs. We attributed these issues to inadequacies in Bechtel's estimating system and Department oversight. We identified several weaknesses related to Bechtel's ...