Environmental Engineering Reference
In-Depth Information
Hammer
Usually
Self supporting
Gravel, rockfill,
Very rapid penetration
Samples limited to rock
$150-170/hr plus
drill (impact
50-100 mm
in rock. Needs
boulders, rock (to
rate (e.g. 200 m in 24
chips. May jam and lose
compressor hire
drill)
casing in soils
just drill a hole)
hours). Can penetrate
equipment in loose fractured
rockfill and soil with
rock, rockfill or boulders.
gravel and cobbles
Penetration in clay is limited
due to blockage of air
passages
Bucket auger,
900-1200 mm
Casing which
Sands and gravels
Drills through gravely
Costly. Sub-sampling and
$300/m for holes to
casing
may or may
but applicable
soils without breaking
testing also expensive
10 m. 10 m/day
and auger,
not be
to all soils
up into smaller sizes.
because of large sample
casing and
recovered
Suitable for investigation
size
clam shell
of sand/gravel filter
sources
Rotary drilling
As for other
As for other
Drilling in swamps,
Allows access where
Smaller rig mounted.
Bombardier $350 per
with rig on
rotary
rotary drilling
water up to
truck mounted rig
Applicable to 30 m
day in addition to
allterrain
drilling
0.5 m deep
would not enter
depth.
ordinary drilling cost
vehicle
because of soft ground
Rotary
As for other
As for other
Drilling in water
Float rig into position
Costly to establish. Smaller
$800 per day in
drilling with
rotary
rotary drilling
up to 6 m deep
and set up on bottom,
rig mounted. Applicable
addition to ordinary
rig on small
drilling
unaffected by tide
to 30 m depth
drilling cost. May
jack-up
or waves
need hire of work-
barge
boat to service rig
Other costs: U50 tubes including sampling $45; U75 tubes including sampling $60; SPT $35 each to 30 m; Core boxes $7/metre; Water cart $130/day;
Compressor $200-300/day; Installation of rotary drill casing 10/m; establishment costs (and accommodation if applicable).
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