Second, a more detailed investigation is undertaken and finally a construction review – these shall be discussed later. A site reconnaissance should also be conducted at this stage and includes a thorough visual inspection of any exposed cuttings and note taken of level of vegetation. Existing records, local authorities, industry, libraries, present or past OS maps and aerial photography or even anecdotal information are to be used. Planning the details of further investigations is appropriate too. Where a site is contaminated it is appropriate at this stage to plan site safety procedures for any further investigations. First a desk study to collate the information above as far as possible. The size and nature of the works will have a bearing on the investigations as will its former use as a site or contamination of ground or groundwater. The cost of an SI is low relative to the project cost and when conducted thoroughly can be a significant saving later.Investigations should evaluate the nature of the ground and groundwater. If a site has been used in the past, this is a major factor in the investigation, mining, quarrying, landfill or waste disposal, industrial usages, archaeological or ecological factors may all have a bearing on the intended works.
And finally, the existing works and their implications. Consideration of suitability on a selection of sites. The effect of changes to the ground and environment due to the works, and, therefore the effect on the works from these changes. Seven factors to be cognizant of at this stage are: suitability of the site for the proposed works, economic and adequacy of design, optimum method of construction with reference to potential issues due to ground and groundwater.
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