01. – The importance of site investigation Page 2 – 4
1.02 – Trial Pits Page 4
1.03 – Auger holes Page 4 – 5
1.04 – Boreholes Page 5 – 7
1.05 – Soil sampling Page 7
1.06 – In-situ testing Page 8
1.07 – Quasi-static cone penetration testing Page 8 – 9
1.08 – Dynamic probing Page 10
1.09 – The Standard Penetration Test Page 11
1.10 – Field vane test Page 12
1.11 – Classifications of Soils Page 13
1.12 – Size range of grains Page 13 – 14
2.00 – Walk over survey Report Page 15 – 19
2.01 – Summary Page 19 – 20
Appendix ‘A‘ Walk over site drawing Page 21
Appendix ‘B’ Site photos and Site Position Page 22
1.01 -The importance of site investigations
Any site investigations should be carried out following code of practice for site investigation ‘BS 5930’ according to the British Standards. The building standards provide us with the best practice and provide a good guide on how to proceed and complete a building project.
Site investigation is the gathering of all the information on ground conditions which might be relevant to design and construction on a particular site. A desk study is the first stage of investigation. This involves checking existing records, such as geological maps of the site. The desk study, and a walk over survey, will indicate the probable ground and groundwater conditions and the problems they might pose.
A desk top survey can be done at the office with little expense, you an find the information from the following places:
Local council – will provide information on any development restrictions close or near to the site.
Utility companies / water board - will provide information on existing water sources, provisions, existing sewers and their location. Previous structures made up ground, quarries and ground mines.
Land registry – will provide information on boundaries / ownership / responsibility and maintenance.
National Geological society of Great Britain –
References: / Bibliography BS 5930 Code of practice for site investigations, Page 4, British Standards, 1999. BRE Site investigation for low rise buildings: Procurement BRE Site investigation: Trial pits Understanding your ground AJ 17/24.12.98 BRE Optimising ground investigation Dagenham Council Google maps