| 1634 Drainage Ditches
Drainage ditches shall be cut & shaped to the sections and profiles shown on drawings. Drainage ditches shall be measured by the volume of excavation and fill and understood as including, compaction & shaping.
1635 Gravel Wearing Course
Gravel wearing course is the top surfacing course made from naturally occurring or crushed gravel and shall be applied to road formation where no concrete or bitumen surfacing is to be applied.
The material for wearing course shall have a plasticity index of 5-25, maximum Los Angeles abrasion and aggregate crushing value of 50 & 35 respectively and 4 days soak CBR of 80.
The grading curve of the material, after processing and compaction shall be a smooth curve with the following envelope.
Sieve size Percentage by
Weight passing
1/2" 100
3/4" 65-95
3/8" 40-70
No4 30-55
No10 20-40
No20 15-32
No60 10-24
No200 4-10
Wearing course shall be deposited and spread in a uniform layer across the full width and compacted and finished to the profiles shown on drawings.
Wearing courses shall be measured by area specifying thickness and shall be understood as including all related work.
Grass & plant showing defects at the end of the maintenance period shall be replanted and maintained by the Contractor for an equal maintenance period as the initial agreement at no cost to the Investor.
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