Reconstruct the history of filling
Collect information on dates, deliveries, the presumed origin of the material and the areas where it was spread. A consignment note using the general name «soil» does not replace a description of its actual composition. If material in part of the area was subsequently mixed or removed, show this on the plan of changes.
Define the spatial scope of the task
A question about the properties of one fill deposit differs from a question about the condition of the entire site. The examination plan must account for zone boundaries, heterogeneity and available information on layers. A specialist determines sampling locations and depths for the task; selecting only a visibly problematic location is insufficient to characterise the area as a whole.
Link samples to their collection locations
For each sample, retain its identifier, position on the plan and a description of the conditions in which it was obtained. Laboratory results are considered in light of this link. Mixing material from different zones without a basis provided for in the plan may cause the result to lose information on the distribution of features.
What to prepare
- A site plan and known areas of fill.
- Delivery documents and information on the material's provenance.
- Dates of work, soil movement and mixing.
- Photographs before and after changes to the area.
- The examination task and existing test results.
What to bear in mind
Before agreeing on the examination, do not mix samples yourself or use one result to characterise the entire area. Unknown material properties require a separate assessment of safe handling procedures.
Outcome of preliminary preparation
A preliminary discussion helps develop an examination layout and determine which conclusions will relate to the delivered material, an individual zone or the site as a whole.
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