Orkney: Repricing Dredging After an Over-Budget Tender

The tender changed the engineering brief

Orkney Islands Council's 27 October report records a combined tender for Flotta and Stromness Harbour dredging whose original scope exceeded the available budget. The council revised the method statement and associated licence application. Its forecast of lower cost now depends on further technical and consent work. The report describes the position at 30 September [1, Appendix 1].

The revised price has to cover an operation that can obtain permission. A saving calculated before that reconciliation can disappear through a longer transport route, a different working window or an additional plant mobilisation.

Two sites carry different outstanding work

Flotta's entry calls for an extensive hydrographic survey and an updated Best Practicable Environmental Option (BPEO) report. Stromness Harbour already has a marine licence following preparation of an archaeological-discovery protocol, but the revised approach requires a BPEO update and another marine-licensing application. The programme lists estimated quantities of 5,500 m3 for Flotta and 3,000 m3 for Stromness Harbour, alongside annual budgets of GBP 200,000 and GBP 60,000 ^[1].

Those tasks should be connected in the estimate. The survey defines the material above the required excavation surface. The method establishes how it will be removed and handled. The environmental option assessment addresses the disposal or management approach, which in turn determines plant movements and handling cycles. A revised quotation needs an explicit quantity surface, material route and operating assumption so that the cost adviser can identify where the reduction arises.

Bundling sites offers a potential mobilisation advantage: the same suitable spread may serve both locations. That advantage depends on the methods and authorised working periods being compatible. If one site is ready while the other awaits consent, the estimator has to compare holding the spread against a second mobilisation. A single procurement package can still require two separate workfront release dates.

Changed methods carry a consent lead time

MD-LOT's variation guidance distinguishes changes it considers non-material from material changes that may need a new application. The revised delivery method should be discussed with the regulator against the existing authorised scope ^[2]. For an estimate, the consequence is a consent programme tied to the actual change: equipment, excavation area, handling route and environmental effects belong in the revision record.

The regulator's pre-disposal sampling guidance requires the sampling and analysis plan to be agreed before sampling. It covers the dredge area, sampling locations and methods, and laboratory requirements. It also requires cores to extend to maximum dredge depth where the specified depth or contamination conditions apply ^[3]. If a cheaper method changes the excavation prism, check that the evidence covers the material that operation will encounter. A method-price comparison that relies on unsuitable sampling can acquire another field campaign and laboratory lead time before the disposal proposal is ready.

For straightforward applications without EIA or statutory pre-application consultation, MD-LOT sets a 14-week target starting with a complete application and fee payment; information requests and unresolved issues extend the process. Its pre-application guidance also identifies other authorisations that may apply [4-5]. The release schedule should carry dates for those inputs and decisions. A planned dredger arrival can then be tested against an evidenced readiness sequence rather than the date of the first application email.

Keep the harbour work separate from the marina expansion

Stromness Marina is a different entry. Its agreement remains unfinished, the council considers a licence application unlikely that year, and the report forecasts no current-year outturn against a GBP 30,000 annual allowance. The underlying two-year expansion-related dredge is estimated at GBP 250,000 ^[1].

A portfolio forecast should therefore carry separate readiness assumptions for the harbour and marina. Combining their names in a contractor enquiry would obscure which geometry, agreement and licence belong to the executable work. For the same reason, the financial year's allowance and the complete project estimate need separate columns in a procurement schedule.

Reprice a releasable operation

For Flotta and Stromness Harbour, the revised estimate should identify each changed production input: excavation quantity, sediment handling, equipment, travel cycle, permitted hours and survey allowance. Keep the original tender assumptions beside the revised ones. That comparison lets the owner distinguish a real method saving from omitted scope or a transfer of cost into a later phase.

Before asking a contractor to reserve plant, issue a common revision schedule for the method statement, survey surface, environmental option and licence conditions. Record which revision the quotation uses and the date each workfront is expected to be released. The practical trade-off is straightforward: extra definition costs time before award, while unresolved assumptions return as qualifications, standby exposure or a further price revision.