APPENDIXJ
J104.2
Site plan requirements. In addition to the
provisions
of Section 107, a gradi
n
g plan haU how the ex
i
stin
g
g
rade
and fini hed grad in contour intervals of ufficienl Jarity
to
indicate the
natl.lre
and e
x
t
ent
of the work a nd how in detail
that it complies with the requirements of this code. The plans
shall show the existing grade on adjoining properties in
suffi-
cient detail to identify how grade changes will conform to the
requirements of this
code.
Jl04.3 Geotechnical report. A ge technical r port prepared
by a registered design professional shall be provided.
The
report shall contain at least the following:
1. The nature and distribution of existing
soils.
2. Conclusions and recommendations for grading proce-
dures.
3. Soil design criteria for any structures or
embankments
required to accomplish the proposed grading.
4. Where necessary, slope stability studies, and recom-
mendations and conclusions regarding site
geology.
Exception: A geotechnical report is not required where
the building official determines that the nature of the work
applied for is such that a report is not necessary.
Jl04.4 Liquefaction study. For sites with mapped
maximum
considered earthquake spectral response accelerations at
short periods
(Ss) greater than 0.5g as determined by
Section
1613, a study of the liquefaction potential of the site shall be
provided and the recommendations incorporated in the
plans.
Exception: A liquefaction study is not required where the
building official determines from established local
data
that the liquefaction potential is low.
SECTION J105
INSPECTIONS
JlOS.l General. Inspections shall be governed by
Section
110 of this code.
Jl05.2 Special inspections. The special inspection
require-
ments of Section 1705.6 shall apply to work performed under
a grading permit where required by the building
official.
SECTION J1
06
EXCAVATIONS
Jl06.1 Maximum slope. The slope of cut surfaces shall be
no steeper than is safe for the intended use, and shall be not
more than one unit verlical in two llnits h tizontal
(50-per-
cent
s
l
ope) unle lhe own r or the owner' authorized agent
f
urnishes a geotech nical report ju tifying a
Leeper
s
l
ope.
Exceptions:
1. A cut surface shall be permitted to be at a slope of
1.5 units horizontal to one unit vertical
(67-percent
slope) provided that all of the following are met:
1.1.
It
is not intended to support structures
or
surcharges.
1.2.
It
is adequately protected against
erosion.
652
1.3.
It
is no more than 8 feet (2438 mm)
in
height.
1.4. It is approved by the building code
official.
1.5. Ground water is not
encountered.
2. A cut surface in bedrock shall be permitted to be at
a
slope of one unit horizontal to one unit vertical
(1
DO-
percent
slope).
SECTION
J107
FILLS
J107.1 General. Unless otherwise recommended in the geo-
technical report, fills shall comply with the provisions of this
section.
J107.2 Surface preparation. The ground surface shall be
prepared to receive fill by removing vegetation, topsoil and
other unsuitable materials, and scarifying the ground to
pro-
vide a bond with the fill
material.
J107.3 Benching. Where existing grade is at a slope
steeper
than one unit vertical in
.
five units horizontal
(20-percent
slope) and the depth of the fill exceeds 5 feet (1524 mm)
benching shall be provided in accordance with Figure
1107.3.
A key shall be provided that is at least 10 feet (3048 mm)
in
width and 2 feet (610 mm) in
depth.
J107.4 Fill material. Fill material shall not include organic,
frozen or other deleterious materials. No rock or similar
irre-
ducible material greater than 12 inches (305 mm) in any
dimension ·hall be included in
fills.
J107.5 Compaction. All fill material shall be compacted
to
90 percent of maximum density as determined by ASTM
D
1557, Modified Proctor, in lifts not exceeding 12 inches
(305
mm) in depth.
Jl07.6 Maximum slope. The slope of fill surfaces shall be
no steeper than is safe for the intended
use
.
Fill slopes
steeper
than one unit vertical in two units horizontal
(
50-percent
slope) shall be justified by a geotechnical report or
engineer-
ing
data.
SECTION J1
08
SETBACKS
Jl08.1 General. Cut and fill slopes shall be set back from
the
property lines in accordance with this section.
Setback
dimensions shall be measured perpendicular to the property
line and shall be as shown in Figure 1108.1, unless
substanti-
ating data is submitted justifying reduced
setbacks.
Jl08.2 Top of slope. The setback at the top of a cut
slope
. hall be not less than that shown in Figure 1108.1, or than
is
required to accommodate any required interceptor
drains,
whichever is greater.
Jl08.3 Slope protection. Where required to protect adjacent
properties at the toe of a slope from adverse effects of the
grading, additional protection, approved by the building offi-
cial, shall be included. Such protection may include but
shall
not be limited
to:
1. Setbacks greater than those required by Figure
1108.1.
2015
INTERNATIONAL
BUILDING CODE®