ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 127)

Communication 4-9
 Choose a location that is as flat as possible with stable base
material.
 Select a location where the antenna will experience
minimal direct impact from road traffic, where possible.
 Make sure the location exists beyond the manhole’s iron
rim beneath the road surface. This will enable you to
access the manhole corbel when drilling the channel for the
antenna cable.
 Verify that no buried utility cables exist in the area in
which drilling will occur for the antenna installation.
Consider contacting a Underground Utility Locating
Service for assistance.
2. Mark the location for the antenna installation, and then mark
the location to drill the corbel hole 64 to 76 mm (2.5 to 3 in)
back from the edge of the antenna hole.
3. Drill a hole from the marked corbel hole location in the road,
through the corbel, and into the manhole using a 500-mm and
then 1-meter long SDS 16-mm drills (½-in by 36-in) hammer
drill bit. This will serve as the channel for the antenna cable
extending from the antenna to the monitor in the manhole. Be
careful to avoid any cables in the manhole, and restart the hole
slightly to the right or left if mesh is encountered or resistance
occurs. Insert an appropriate length of 16-mm reinforced
sampler tubing through the hole and into the chamber, and then
trim the tubing as necessary.
4. Cut a 152-mm (6-in) long by 32-mm (1.25-in) wide by 19-mm
(0.75-in) deep hole in the road using the non-rotating
demolition hammer (in the hammer only mode) with the
chisel/grinder. This will serve as the installation location for
the antenna. The corbel hole should be under the center of this
hole.