The subdivider shall grade each land division
in order to establish street, block and lot grades in proper relation
to each other and to topography as follows:
A. Master site grading plan.
(1) A master site grading plan shall be prepared by the
subdivider for all new subdivisions. This plan shall be prepared in
accordance with the requirements and standards of the City.
(2) The master site grading plan shall show existing and
proposed elevations of all lot corners, control points and building
locations. The plan shall also indicate all overland storm drainage
in and adjacent to the subdivision. The cost of the preparation of
such a plan shall be paid for by the subdivider.
(3) After approval or modification of these plans by the
City Engineer, the full width of the right-of-way of the proposed
streets within the subdivision and the entire subdivision lot area
shall be graded in accordance with the master site grading plans.
The owners of the subdivision lots shall adhere to those plans.
(4) Upon completion of all street and subdivision grading,
the grades shall be checked and certified by the City Engineer to
determine that the completed grading work is in accordance with the
master site grading plan.
(5) The cost of all required grading work, supervision,
certification, inspection and engineering fees shall be paid for by
the subdivider.
B. Right-of-way grading. The subdivider shall grade the
full width of the right-of-way of all proposed streets in accordance
with the approved plans, including the grading of sight triangles
at each intersection.
C. Block grading. Block grading shall be completed by
one or more of the following methods:
(1) Regrading along the side or rear lot lines which provides
for drainage to the public drainage facilities, provided that any
ditches or swales are in public drainage easements, provided that
a deed restriction is adopted which prohibits alteration of the grades
within five feet of any property line from the grades shown on the
master site grading plan.
(2) Parts of all lots may be graded to provide for drainage
to a ditch or to a swale.
D. Miscellaneous grading requirements.
(1) Lot grading shall be completed so that water drains
away from each building site toward public drainage facilities at
a grade approved by the City Engineer, and provisions shall be made
to prevent drainage onto properties adjacent to the land division
unless to a public drainage facility.
(2) Grading activities shall not result in slopes greater
than 3:1 on public lands or lands subject to public access.
(3) The topsoil stripped for grading shall not be removed
from the site unless identified in the erosion control plan approved
by the City Engineer as not being necessary for erosion control or
site landscaping purposes. Topsoil shall be uniformly returned to
the lots when rough grading is finished. Topsoil piles shall be leveled
and seeded for erosion control prior to the City releasing the one-year
guarantee provision on public improvements in the streets adjacent
to the lots on which the topsoil is stockpiled.
(4) Such grading shall not result in detriment to any
existing developed lands, either within or outside of the corporate
limits.
(5) The City Council shall require the subdivider to provide
or install certain protection and rehabilitation measures, such as
fencing, sloping, seeding, riprap, revetments, jetties, clearing,
dredging, snagging, drop structures, brush mats, willow poles and
grade stabilization structures. Seeding of the site shall occur within
30 days of rough grading.
(6) Tree cutting and shrubbery clearing shall not exceed
50% of the lot or tract and shall be so conducted as to prevent erosion
and sedimentation, preserve and improve scenic qualities, and, during
foliation, substantially screen any development from stream or lake
users.
(7) Paths and trails in wooded and wetland areas shall
not exceed 10 feet in width unless otherwise approved by the City
Council and shall be so designed and constructed as to result in the
least removal and disruption of trees and shrubs and the minimum impairment
of natural beauty.
(8) Earthmoving, such as grading, topsoil removal, mineral
extraction, stream course changing, road cutting, waterway construction
or enlargement, removal of stream or lake bed materials, excavation,
channel clearing, ditching, drain tile laying, dredging, and lagooning,
shall be so conducted as to prevent erosion and sedimentation and
to least disturb the natural fauna, flora, watercourse, water regimen,
and topography.
(9) Review of the conduct of such cutting, clearing, and
moving may be requested of the County Soil and Water Conservation
District Supervisors, the State District Fish and Game Managers, and
the State District Forester by the City Engineer and Plan Commission
as they deem appropriate.
E. Drainage flows. The subdivider shall cause to be set
upon the master grading plan arrows indicating the directions of drainage
flows for each property line not fronting on a street on all parcels
and along each street as will result from the grading of the site
or the construction of the required public improvements or which are
existing drainage flows and will remain. The arrows indicating the
directions of flows shall be appropriately weighted so as to differentiate
between the minor and major (one-hundred-year event) drainage components.
The arrows shall be accompanied on the master grading plan with the
following note: "Arrows indicate the direction of drainage flows in
various components resulting from site grading and the construction
of required public improvements. The drainage flow components located
in easements shall be maintained and preserved by the property owner
unless approved by the City Engineer."
The City finds that urbanizing land uses have accelerated the process of soil erosion, runoff and sediment deposition in the waters of the City. Therefore, it is declared to be the purpose of this section to control and prevent soil erosion and minimize stormwater runoff increases and thereby to preserve the natural resources, control floods and prevent impairment of dams and reservoirs, protect the quality of public waters, protect wildlife, protect the tax base, and protect and promote the health, safety and general welfare of the people of the City. All land disturbing activities shall be subject to the provisions of the City's Construction Site Erosion Control Ordinance (Chapter
230).