Table 7.27.

Sampling quality

Quality class (BS EN 1997-2 2007)Sampling category according to EN ISO 22475-1PropertiesPurposeTypical sampling procedure (for cable percussion and rotary coring)
1A
  • Minor textural and structural details;

  • Particle size, moisture content, organic content, Atterberg Limits, particle density;

  • Density, density index and permeability;

  • Compressibility;

  • Effective stress parameters;

  • Total stress parameters;

  • Coefficient of consolidation;

  • Contamination (if subsampled immediately).

Laboratory data on in situ soilsPiston thin-walled sampler with water balance or very-good-quality recovered core
2A
  • Minor textural and structural details;

  • Particle size, moisture content, organic content, Atterberg Limits, particle density;

  • Density, density index and permeability;

  • Compressibility;

  • Effective stress parameters;

  • Total stress parameters;

  • Contamination (if subsampled immediately).

Laboratory data on in situ insensitive soilsPressed or driven thin-or thick-walled sampler with water balance or good-quality recovered core
3A,B
  • Minor textural and structural details;

  • Particle size, moisture content, organic content, Atterberg Limits, particle density;

  • Contamination (if subsampled immediately).

Minor textural and structural examination and laboratory data on remoulded soilsPressed or driven thin- or thick-walled samplers, water balance in highly permeable soils or recovered core
4A, B
  • Broad textural and structural details;

  • Particle size, moisture content, organic content, Atterberg Limits, particle density;

  • Contamination (if sampled into appropriate containers).

Laboratory data on remoulded soils; sequence of strataBulk and jar samples
5A, B, CNoneApproximate sequence of strata onlyWashings
  • Based on BS EN 1997-2 2007 and adapted following Rowe (1972).