1.1 General

Be fully aware of all information and requirements contained in the site investigation report before work starts on site. A ground investigation can vary from a visual inspection of, say, open sewer trenches to a full investigation with boreholes to considerable depth. Similarly, the soils testing can vary from the cursory to the very detailed. Every excavation on site is in effect a trial pit and every opportunity should be taken to observe the soils. This information can be useful to gain a general picture of the soils underlying the site.

1.2 Contaminated ground

It is becoming increasingly necessary to develop land which has become contaminated by the residues from the industrial activities of the past 100 years. Many such sites contain a variety of dangerous. chemicals. It is therefore essential to obtain as much information as possible regarding the use to which the site was previously put and dependent upon this, organise a detailed survey by a qualified laboratory. Such a survey will highlight potential dangers thereby enabling a safe system of work to be established, advice on which should be sought from the local Health and Safety Advisor.

1.3 Code of practice

BS 8004-"Code of Practice for Foundations" must also be considered as the 'bible' for reference during both the planning and working stages of a project involving earthworks, excavations and foundation construction.