The Original Soil Test
If you can get a copy of the original soil test, there is a wealth of information available to you. It is so important in assessing the performance of a new house, that I would almost say it is imperative that you assess the original soil test as part of your slab heave investigation.
Look for these features:
- Was the soil test provided by an experienced, local soil tester?
- Was the soil tester registered to provide the soil test?
- Was the soil tester engaged by the owner of the residence, the builder or the developer?
Then you can assess these elements of the soil test:
- What was the site classification?
- Is the site the correct site. If there is a site plan does it match the shape of the site?
- Does the date on the soil report predate the engineer’s design and the footing pour date?
- Was fill identified on the site. Was it controlled fill?
- Were Atterburg limits or shrink swell indices used to calculate the site reactivity
- Was the site reactivity expressed as a range or a specific number?
- Does the soil in the borelogs correspond with the soil in the description section of the report.
- Which soil layer was used to calculate the Atterburg limits or Shrink swell index.
- Does the depth of testing match the required depth as per AS2870?
- Do the DCPs match the description of the firmness of the soil?