The first step to understanding how Lot based quality assurance (LQA) works is understanding the concept of a Lot.
A Lot is simply a specific, discrete section of the physical work or a process which forms part of the works being constructed. For a small, simple project you may simply break Lots as following:
- Management Plan Approvals
Generally, on larger projects many Lots would make up each of these categories. This may be because a section of work is too big to easily be managed in its entirety, works of a similar type occur at different times or locations, or because of other restrictions imposed on Lot definition by the project specification.
An example of this may be the pavements where a Lot is restricted to a single day’s production with a paving machine, of a single type of gravel. Something similar to this is found in the TMR specification for pavements MRTS08:
Where no maximum Lot size is specified for construction is specified in Clause 1.2 of Annexure MRTS08.1, the maximum Lot size shall be equal to the area (in m2) of production of one completed stabilized layer achieved during one work period, provided the material is essentially uniform.
In this case the Lots may be as follows
- Lot #ABCDEF001 – Subbase Ch 10,000 to 11,500 – day 1
- Lot #ABCDEF002 – Subbase Ch 11,500 to 12,750 – day 2
- Lot #ABCDEF003 – Base Ch 10,000 to 11,500 – day 3
- Lot #ABCDEF004 – Base Ch 11,500 to 12,750 – day 4