ABSTRACT
Sharp sand – – – – 35.72 m3 35.72 Gravel (washed river or pit) – – – – 33.67 m3 33.67 Shingle – – – – 36.35 m3 36.35 Topsoil – – – – 33.60 m3 33.60 Gravel rejects – – – – 30.68 m3 30.68 Selected granular material 6F2 – – – – 13.80 m3 13.80
Clarification notes on labour costs in this section
General groundworks team Generally a three man team is used in this section; The column Labour hours reports team hours. The column Labour £ reports the total cost of the team for the unit of work shown
3man team – 1.00 59.25 – – hr 59.25
SOAKAWAYS Preamble: Flat rate hourly rainfall = 50mm/hr and assumes 100 impermeability of the run-off area. A storage capacity of the soakaway should be 1/3 of the hourly rainfall. Formulae for calculating soakaway depths are provided in the publications mentioned below and in the Tables and Memoranda section of this publication. The design of soakaways is dependent on, amongst other factors, soil conditions, permeability, groundwater level and runoff. The definitive documents for design of soakaways are CIRIA 156 and BRE Digest 365 dated September 1991. The suppliers of the systems below will assist through their technical divisions. Excavation earthwork support of pits and disposal not included.
