Under an Option A contract (NEC 3), it is my understanding that the activity schedule is a lump sum for “providing the works” e.g. the information shown on the contract drawings and specification. It is also my understanding that it is a contractors risk, if an item is not included/ omitted in the activity schedule as it is deemed to be included in the other items in the schedule.
An issue has arisen on the project I am currently working on (Option A, NEC 3). On different contract drawings, the construction detail for the edge of the same footpath are different (Note - the contract appendices/ specification provides the same information as that shown on the drawings so there is no ambiguity/ inconsistency between drawing and specification).
The Contract drawings are in different series (structures, landscaping):- one drawing shows the edge details as a blockwork wall, the other drawing shows is as a precast kerb. (Note - the correct detail should be blockwork wall)
The activity schedule has broad headings that would appear to suitable to cover both instances of edge details.
My question is:-
- Does the lump sum include for both instances and thus the “wrong” edge detail should be deleted (cl60.1 (1)), thus reducing the prices only (cl63.10), or
- Is cl17 (ambiguities or inconsistencies) applicable and thus a compensation event under 60.1(1) value using cl63.8?
I hope I have explained the above clearly.