The slope of cut or fill surfaces shall be no
steeper than two horizontal to one vertical or shall be no steeper
than is safe for the soil and intended use, whichever is more restrictive.
A bench not less than three feet wide and with a maximum slope of
ten percent shall be provided adjacent to all structures at the top
of slopes steeper than three to one. The need for slopes steeper than
allowed above shall be avoided by the installation for approved retaining
walls or approved equivalent stabilization procedures. Cut slopes
to be revegetated shall be no steeper than three horizontal to one
vertical. Any requests for exception shall be accompanied by engineering
data which indicates that a steeper slope can be constructed in accordance
with sound engineering practices, and includes details of treatment
to prevent surface erosion and provide adequate structural stability.
The ground surface shall be prepared to receive
fill by removing vegetation, noncomplying fill, topsoil, and other
unsuitable materials. The ground shall be scarified to provide a bond
with the new fill. Where slopes are steeper than five to one, and
the height is greater than five feet, the slope shall be benched into
sound bedrock or other competent material as determined by the civil
or soils engineer. The bench under the toe of a fill on slopes steeper
than five to one shall be at least ten feet wide. The area beyond
the toe of fill shall be sloped for sheet overflow or a paved drain
shall be provided. Where fill is to be placed over a cut, the bench
under the toe of fill shall be at least ten feet wide, but the cut
must be made before placing fill and approved by the soils engineer
or engineering geologist as a suitable foundation for fill. Unsuitable
soil is soil which, in the opinion of the City engineer, the civil
engineer, the soils engineer, or the engineering geologist, is not
competent to support other soil or fill, to support structures, or
to satisfactorily perform the other functions for which the soil is
intended.
A.
Detrimental amounts of organic material shall not
be permitted in fills. Except as permitted by the City engineer, no
rock or similar irreducible material with a maximum dimension greater
than twelve inches shall be buried or placed in fills.
B.
Exception. The City engineer may permit placement
of larger rock when the soils/civil engineer requesting such placement
properly devises a method of placement, continuously inspects its
placement, and approves the fill stability. The following conditions
shall also apply:
(1)
Potential rock disposal areas shall be delineated
on the grading plan;
(2)
Rock sizes greater than twelve inches in maximum dimension
shall be ten feet or more below grade measured vertically;
(3)
Rocks shall be placed so as to assure filling of all
voids;
(4)
All fills shall be compacted to a minimum of ninety
percent of maximum density as determined by ASTM D-698-70 and ASHTO
T99. Field density shall be determined in accordance with ASTM D-698-70
or the most recent update thereof, or equivalent as approved by the
City engineer;
(5)
The slope of fill surfaces shall be no steeper than
is safe for the intended use. Fill slopes shall be no steeper than
three horizontal to one vertical.
All retaining walls shall be designed in accordance
with the Uniform Building Code and with good engineering practices.
Walls higher than four feet shall be designed by a licensed engineer
and plans submitted to the City for approval before construction.
Any wood used in retaining walls shall be pressure treated in accordance
with the Uniform Building Code, stamped or certified by an approved
testing agency at the factory. Where the drainage flow is over the
top of retaining walls, adequate protection shall be provided to prevent
erosion of the soil on both sides of the wall.
All fills which support foundations and slabs
on grade, including but not limited to floors, patios, porches, driveways,
sidewalks, and fills for utility trenches shall be compacted to a
minimum of ninety-five percent of maximum density as determined in
accordance with ASTM D-698 or its approved equivalent. It is not the
intent of this Part 6 to control compaction of backfill around foundation,
but rather to make it the responsibility of the builder to correct
substantial subsidence which occurs within one year of the date of
the issuance of the final certificate of occupancy or City acceptance.
When substantial subsidence occurs within this year, it shall be the
responsibility of the owner of the property to notify the builder
and to temporarily prevent any further damage in the subsided area.
The builder shall correct the subsidence within thirty days of written
notice by the owner.
A.
General. Fine grading shall be constructed per good
engineering standards and in accordance with the approved final drainage
plan.
B.
Slope away from the building. The slope away from
the building shall have a minimum grade of 2.5 percent for the first
ten feet or property line, whichever occurs first, then two percent
until the slope reaches the drainage channel around the building or
a drainage channel which carries drainage away from the building.
If other lots are draining through the lot in question, then the slope
in the first ten feet shall be increased to five percent. In no condition
shall the bottom of the drainage channel at its highest point be less
than six inches below the grade at the foundation of any adjacent
structure.
C.
Drainage channel around the unit. The drainage channel
around the unit shall have a minimum slope of two percent unless otherwise
recommended by a civil engineer and approved. Where it is intended
that a drainage channel be constructed straddling the property line,
both halves of the drainage channel must be constructed at the time
the first building is completed. Where one side of the drainage channel
is considerably steeper than the other the velocity effect of the
water draining off the steep side shall be taken into account so as
to prevent carrying the water over the other side. Drainage channels
having sharp change in direction shall be constructed with adequate
turn radius and depth to prevent overflow. Obstruction of drainage
channels, such as fences, diversion works and walls shall not be allowed
within the drainage channel unless adequate provisions have been made
to allow passage of drainage.
A.
General. Fine grading shall be constructed per good
engineering standards and in accordance with the approved final drainage
study.
B.
Slope away from the building. The slope away from
the building shall have a minimum grade of 2.5 percent for the first
ten feet, then two percent until the slope reaches the drainage channel
around the building or a drainage channel away from the building.
If other lots are draining through the lot in question, then the slope
in the first ten feet shall be increased to five percent. In no condition
shall the bottom of the drainage channel at its highest point be less
than six inches below the grade at the foundation of any adjacent
structure.
C.
Drainage channel around units. The drainage channel
around units shall be constructed in such a fashion as to carry the
one-hundred-year developed flow through the project without inundating
any units. Drainage channels shall be piped under walks and through
curb heads so as not to carry drainage collected in drainage channels
over top of sidewalks and/or over top of curbs. Sidewalks shall not
be constructed in the bottom of the drainage channel unless so specified
in the approved final drainage plan. Where sidewalks and drainage
channels are parallel the depth of flow in the drainage channel for
the design storm shall not exceed the top of the sidewalk.
A.
General. Fine grading shall be constructed per good
engineering standards in accordance with the approved final drainage
plan required by the City storm water runoff control ordinance.
B.
Slopes away from the building. The slopes away from
the building shall be per the recommendation of the soils or civil
engineer and per good engineering judgment.
Rough and/or fine grading within major drainage
ways or subdivisions shall be per an approved set of construction
plans and per the approved grading plan. This grading work shall also
be per the approved final drainage plan required by the City storm
water runoff control ordinance.
A.
No person shall make a change in land use, ground
slope, or drainage channel which is not in accordance with the grading
plan, per this Part 6, or included in the construction/land development
permit.
B.
Each violation of these regulations shall be a misdemeanor.
Each violation for each day it shall continue shall constitute a separate
offense, and each violation shall be punishable by either a fine of
not more than seven hundred fifty dollars and/or by imprisonment for
a period not exceeding six months.
C.
Upon knowledge of a violation, the City may require
the City attorney to commence action to correct the violation, charge
the offender for costs incurred in correcting the violation, and otherwise
punish the offender as provided by law.
These regulations shall be and are hereby declared
to be in full force and effect upon the date of passage.
