Supporting documents

Foundations Traditional strip or pad foundations should be taken onto the underlying firm and firm to
stiff natural clays at a minimum depth of 900mm. An allowable bearing capacity of
125kN/m 2 is appropriate.
External
Works
Surface Water
Drainage
It is recommended that current guidance with respect soil shrinkage/heave associated
with trees/hedgerows is followed; this should be based on a medium volume change
potential for the natural clays.
Ground bearing floor slabs are considered appropriate with the made ground sorted and
re-engineered prior to floor construction.
Subsurface concrete should be designed in accordance with BRE Special Digest 1:2005
Design Sulphate Class DS-1 and ACEC classification AC-1.
A preliminary CBR value of 5% is considered appropriate for made ground granular soils
and weathered sandstone subgrades with 2% for natural clays, subject to proof rolling.
On site CBR testing is recommended prior to pavement construction.
Soakaway drainage of surface water is not considered appropriate.
11562 iii Paisley
Aldi Stores Ltd March 2013