Preparation of trenches
OmniTrax Product Guide Page 103
Burial in crushed stone
Burial in clear crushed stone that extends from the surface to the sensor cable burial depth,
requires the use of a stone dust, or a sand bedding, wrapped in geotextile fabric. The bedding
protects the sensor cables from the crushed stone, and the geotextile fabric protects the bedding
from erosion. In addition, add a sand or stone dust topping over the crushed stone to help fill the
voids between the stones.
Burial under asphalt
Burial under a narrow strip of asphalt
Micro-trenching cannot be used for narrow cable spacing installation under asphalt. Instead, for a
thin strip of asphalt remove a 30 cm wide strip of the hard surface over the sensor cable’s path,
and then dig the trench. The burial depth under these narrow asphalt strips is slightly deeper than
the burial depth in the adjacent soil to better match the detection sensitivity of the different media.
If there is a crushed stone layer that extends to, or close to, the sensor cable burial depth, dig the
trench deeper and use a stone dust or sand buffer to protect the sensor cables from the stones.
After cable installation, restore the asphalt surface.
Figure 65: Crushed stone toppings
Figure 66: Crushed stone burial
cm clear crushed stone topping
5 cm (2 in.)
5 cm clear crushed stone topping
5 to 15 cm
(2 to 6 in.)
23 cm
(9 in.)
sensor cable
10 cm
(4 in.)
native soil
native soil
10 cm
(4 in.)
sensor cable
15 cm
(6 in.)
marker tape
marker tape
7.5 cm (3 in.)
30 cm
(12 in.)
7.5 cm
geotextile
fabric (for bedding)
stone dust/sand topping
10 cm
(4 in.)
clear crushed
stone
23 cm
(9 in.)
sensor cable
stone dust or sand
bedding
marker
tape
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