As highlighted above the Contract may define limits on the sort of waste the Contractor is obliged to accept or give the Contractor certain protections from the impact of having to accept such waste. In most cases it is more practical for the Contractor to accept the waste and therefore the Contract normally defines a class of "Ad hoc" waste which is subject to different arrangements.
The definition of Ad Hoc Waste varies a lot from project to project depending on the technological solution and the scope of the services. In the WIDP Contract, Ad Hoc Waste is defined as waste received separately or segregated by the Contractor which good industry practice required to be treated separately from other Contract Waste. The WIDP Contract (Schedule 31) also allows examples to be listed in a non-exhaustive list.
The Contract Management Manual should provide a clearly written and accessible definition of that waste that falls to be treated as Ad Hoc Waste. Where there is agreement with the Contractor as to how such waste will be treated this should also be recorded.
Whilst the Contractor is obliged to accept Ad Hoc Waste it can charge a different rate per tonne, as specified in the contract, and the waste will not normally count towards the calculation of service performance.