As noted above the evaluation of options against certain criteria will invariably require the development and application of waste flow models. The waste flow model will generate the annual tonnage data that will determine levels of recycling, recovery and disposal. It should also identify the tonnage capacities of the transfer, treatment and disposal infrastructure. Once the capacity of the facilities in each option is determined it is possible to forecast the capital expenditure and operating expenditure associated with the required infrastructure.
The evaluation of cost differs from other factors in that affordability is often a key constraint and cost is by definition a quantified parameter. The issues arising from the evaluation of cost are discussed further in Sections 8 and 9 and Appendix 4.
For consistency, unless there is a clear reason for change the top level evaluation criteria applied at the OBC stage (to determine the technology for the Reference Project) should be carried forward and incorporated into the evaluation methodology applied to the evaluation of solutions put forward by bidders at the procurement stage. The bid
evaluation methodology should, however, involve a wider set of issues than that considered at the OBC stage, e.g. it will include a legal evaluation. One further key difference at the bid evaluation stage, is that the cost of the project should be assessed by reference to price (i.e. Unitary Charge) plus the direct cost consequences of the project on the Authority (e.g. LATS implications) rather than the FEC.