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Pavement Subgrades 95 Percent (upper 2 feet)
Pavement Subgrades 90 Percent (below 2 feet)
Fill Placement and Compaction: Upon completion of stripping, general excavation, proofrolling,
and overexcavation, the structural fill should be placed as described in Section 5.0 to achieve
design elevations. The on -site fill is suitable for use as structural fill provided it can be properly
moisture conditioned and compacted. The existing asphaltic concrete is not suitable for use as
structural fill.
43 SEISMIC DESIGN CRITERIA
In accordance with Section 1636 of the 1997 Uniform Building Code, the following seismic
design criteria should be used for structural fill:
Site Profile: Sd (stiff soil profile)
Seismic Zone: 3; Z = 0.30
Seismic Source Type: A
Seismic Coefficient Ca: 0.36
Seismic Coefficient Cv: 0.54
4.4 AUGER -CAST PILE FOUNDATION
Auger -cast pile fc-undations should be designed using the following criteria
• Pile Types and Diameters 16-, 18-, or 20-inch-diameter auger -cast
• Bearing L. _ - Post -Glacial Alluvial Sand or Glacial Silt
• Safety Factors
The allowable down%and pile capacities include safety factors of about 3 for end bearing and 1.5
for side friction, with an overall safety factor of at least 2.0. The allowable uplift capacities
include a safety factor of about 2.0.
• Auger -Cast Pile Design Criteria
Diameter
(inches)
Allowable
Downward Capacity
s
Allowable
Uplift Capacity
s
Recommended Penetration
into Bearing Layer s
16
80
50
15 --
1%
105
55
15
20
120
60
15
Pag, 5
6021 W 1 601 1 "57
Copyngh, 2000 1CI—C.14— L-