Go Vertical with Confidence®
Foundation Systems and Services
Farrell recommends, designs and installs Ground Improvement and Deep Foundation solutions that are
best suited for the given site, soil, groundwater, and proposed structure condition. Farrell also provides
foundation peer review and specialty design services. Our proven foundation systems are shown below.
Drill
Displacement
Pile
Geopier®
Drill
Displacement
Column™
Impact® Pier
Rapid Impact
Compaction
Helical
Mini-piles
40 ft (12 m)
20 ft (6 m)
100 ft (27 m)
Depth Limit
85 ft (26 m)
80 ft (24 m)
25 ft (8 m)
Compatible Soils
Sand (SP, SM, SC)
Contaminated Soil
Silt (ML, MH)
Silt (ML)
Sand (SP, SM, SC)
Sand (SP, SM, SC)
Silt (ML, MH)
Sand (SP, SM, SP)
Clay (CL, CH)
Clayey Sand (SC)
Silt (ML, MH)
Silt (ML, MH)
Clay (CL, CH)
Silt (ML, MH)
Clayey Sand (SC)
Silty Sand (SM)
Undocumented Fill
Clay (CL, CH)
Contaminated Soil
Clay (CL, CH)
Silty Sand (SM)
Contaminated Soil
Contaminated Soil
Undocumented Fill
Undocumented Fill
Undocumented Fill
Poorly Graded
Sand (SP)
Undocumented Fill
Bearing Capacity Range (ASD)
100 kips (445 kN)
4,000 psf (192 kpa)
5,000 psf (239 kpa)
3,000 psf (144kpa)
2,000 psf (96 kpa)
to
to
to
to
to
20 kips (89 kN)
to
500 kips (2224 kN)
10,000 psf (479 kpa)
9,000 psf (431 kpa)
6,000 psf (287 kpa)
8,000 psf (383 kpa)
200 kips (890 kN)
Highly cost effective
Small equipment
for tight access
Key Advantages
Deep pile with
ground improvement
No vibration
Very high stiffness
Cost effective support
No vibration
Readily available
material
Low spoil
Low spoil
High capacity
High capacity
Well defined
concrete column
16” 18” 24” diameters
Steel reinforcement
Liquefaction
mitigation
No casing
LEED opportunity
Low spoils
High bearing capacity
High stiffness
Uplift-tension
hold-down
Densification
Liquefaction
mitigation
Liquefaction
mitigation
Fast improvement
process
Ideal for
repair/retrofit
Minimal site impact
No spoils
No spoils
Densification
No vibrations
Pad grading required
High material cost
Uplift-tension
hold-down
Key Considerations
Deep Pile
Impermeable
Grout with low spoil
Grout with low spoil
Concrete cleanup
Concrete cleanup
Flat stable pad
Flat stable pad
Pile connections
Gravel cushion
Vibration system &
Low noise
Vibration system
& Low noise
High spoil haul-off
Soft clay
requires grout
Casing at high ground
water sand
Moderate depth limit
Not good for small site
Vibrations within 30 ft
Steel below water
Shallow depth limit
Weld splice for SPP
High noise
No work next
to buildings
Comparable To
Concrete piers
Concrete piers
Overex/replace
Overex/replace
Driven piles
Driven piles
Concrete piers
Concrete piers
Stone columns
Stone columns
Driven piles
Driven piles
Soil-cement columns
Soil-cement columns
Stone columns
Stone columns
Torque piers
Franki piers
Soil-cement columns
Soil-cement columns
Deep dynamic
compaction
Micro-piles
Overex/replace
Concrete piers
Stone columns
Geopier, Impact, and Rammed Aggregate Pier are registered trademarks of Geopier Foundation Company, Inc.
Geopier systems by Farrell in Northern California.
© 2016 Farrell Design-Build Inc. Go Vertical with Confidence and Drill Displacement Column are the trademarks of Farrell Design-Build Inc.
Serving California and the West Coast
sacramento 530.621.4867
irvine 949.428.9596
lic 477361 A+B
farrellinc.com
Soil-nails
Driven piles