ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 142)

4-24 IETG FlowHawk Manual
Forming a thin taper using vinyl tape
4. Excavate a trench at least 305 mm (12 in) deep and 102
millimeters (4 in) wide from the EMU/power source location to
the monitor location. Consult local regulations to verify the
required trench depth for the area.
5. Drill a 13-milllimeter (½-in) (minimum) hole through the corbel
(structural foundation holding the manhole cover) or manhole
wall to provide a smooth transition for the cable into the trench.
6. Run the communication cable from the monitor location in the
manhole to the EMU/power source location. If required by
local code, run cable through 19-millimeter (¾-in) electrical
PVC conduit in the following way:
 Extend the conduit through the manhole corbel or wall at
the monitor location.
 Lay the conduit in the trench per local regulations and feed
the communication cable through the conduit.
 Extend the conduit approximately 305 mm (12 in)
vertically out of the trench (from the ground surface) at the
designated EMU/power source location.
 Use urethane foam to seal the space between the conduit
and the corbel or manhole wall to prevent infiltration into
the manhole.