A developer has highlighted to me that some consultants don't supervise the drilling of 'window' sample holes!
Those familiar with small diameter percussive holes will instantly flag the issues with this practice.
It appears that a subcontract driller logs on site and then transport the samples back to the consultants office for logging and sampling. It actually states this in the interpretive report.
Clearly there are many issues with this.... mix up of sample within the liners, sample preservation and missed observations from the drilling progress on site / odours / small lenses etc.
Can I bring this to the attention of the regulators - we really need to stamp this sort of practice out as the results will be pretty meaningless IMO.
Yes engineering supervision does cost, but on such an important exercise cost should not be an issue.
Comes back to 'rubbish in rubbish out' when it comes to modelling on naff field data.
No wonder I often loose out on competitive tenders when people are saving the cost of an engineer on window sampling jobs!
Best Regards
Marc Fawcett
Director
Betts Geo Environmental
http://uk.linkedin.com/in/marcfawcett
Head office
T – 01244 288179
F – 01244 288516
Old Marsh Farm Barns, Welsh Road, Sealand, Flintshire, CH5 2LY
www.betts-associates.co.uk
STRUCTURAL CIVIL GEO-ENVIRONMENTAL FLOOD RISK ANALYSIS
STRUCTURAL SURVEYS CONTAMINATED LAND ECOLOGY
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