Job Book 9th Edition - Book - Page 127
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Stage 1 > Preparation and Brief: Supplementary Material: 1/SM5
Spot levels, indicating:
• the base of all trees
• all services covers, etc.
• pavement kerbs and road crowns where they enter the site.
Indicate contours, intervals (in metres) and position of section lines (on grid lines
where possible).
Indicate all services above and below ground adjacent to, connecting into or
crossing the site with relevant levels, falls, heights, access points, manholes (show
cover levels and inverts). Also:
• pylons, posts (show headroom)
• soil and surface water drains
• water mains
• electricity cables
• telecommunication cables
• gas mains
• any other services.
Indicate trees, hedges and large shrubs, their height and position, spread of
branches and diameter of trunk 1 metre above ground level.
Soil investigations
On a domestic project or one which involves a relatively small and light structure,
it might well be sufficient for the architect to instruct the digging of trial pits. These
should be set out with regard to the siting of the proposed building. On anything
larger, investigation by boreholes may be necessary to obtain information and
data for the design and construction of foundations, underground structures,
roadworks, earthworks, etc. On sites containing contaminated land or unstable
landfill, specialist advice will be needed on the surveying techniques to be used.
The structural engineer may be able to give preliminary advice by examining
available information about the geology and history of the site, e.g. maps and
memos produced by the British Geological Survey, Ordnance Survey maps,
engineering data from earlier works in the area or aerial photographs.
The structural engineer should recommend the type and extent of investigations
to be carried out, including the number of trial holes necessary to obtain an
accurate assessment of the subsoil and water table conditions.
The investigating firm must allow for carrying out the work in accordance with
any special requirements of the existing owners or occupiers of the site. They
and/or their subcontractor specialists should be made responsible for all security,
protection and related insurance during execution of the work.
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