HomeMy WebLinkAbout2734ORDINANCE NO. 2734
AN ORDINANCE of the City of Port Angeles
establishing regulations pertaining to
clearing, grading, filling, and drainage
in the City of Port Angeles and creating
Chapter 15.28 of the Port Angeles Municipal
Code.
THE CITY COUNCIL OF THE CITY OF PORT ANGELES DOES ORDAIN
as follows:
Section 1. There is hereby created a new chapter in the
Port Angeles Municipal Code, to read as follows:
Chapter 15.28
CLEARING, GRADING, FILLING, AND DRAINAGE REGULATIONS
Sections:
15.28.010 Purpose.
15.28.020 Definitions.
15.28.030 Clearing and Grading Permit Required.
15.28.040 Permit Exemptions.
15.28.050 Permit Application.
15.28.060 Plans and Specifications.
15.28.070 Additional Application Information.
15.28.080 Review Criteria.
15.28.090 Standards.
15.28.100 Conditions.
15.28.110 Maintenance Responsibilities.
15.28.120 Permit Issuance - Expiration - Extension.
15.28.130 Permit Fees.
15.28.140 Security.
15.28.150 Insurance.
15.28.160 Inspections.
15.28.170 Suspension of Permits.
15.28.180 Completion of Work.
15.28.190 Posting of Permit.
15.28.200 Administration and Enforcement.
15.28.210 Appeals.
15.28.220 Clearing, Grading, Filling, and Drainage Rules and
Guidelines.
15.28.230 Other Laws.
15.28.240 Removal of Dirt, Debris, or Other Material -
Sanctions.
15.28.250 Public Nuisance.
15.28.260 Penalty.
15.28.010 - Purpose. This Chapter is adopted for the
following purposes:
A. To promote, protect, and preserve the public interest by
establishing standards for and regulating land alteration,
particularly the clearing, grading, filling, and /or drainage of
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land in the City without preventing the reasonable use of land;
B. To regulate land- disturbing activity for control of
erosion, sedimentation, stormwater runoff, water pollution,
vegetation removal, and landslide in order to minimize damage to
public and private property;
C. To promote building and site planning practices that are
consistent with the City's natural topography, soils, and
vegetation features and which implement the Port Angeles
Comprehensive Plan and the Washington State Environmental Policy
Act;
D. To minimize hazards to life, health, and property;
E. To require that development of environmentally sensitive
lands be accomplished in a manner which protects those areas from
damage or degradation and which promotes the health, safety, and
welfare of the public.
Notwithstanding the above - stated purposes, nothing in this Chapter
is intended to or shall be deemed to create a duty of the City to
protect or promote the interests of any particular person or class
of persons. Further, the existence of these regulations or any
failure, refusal, or omission of the City to enforce any provision
in this Chapter is not intended to prevent, supplant, or affect
the right of any person affected by the clearing, grading,
filling, and /or drainage operations of another to invoke such
private remedies as may be available against such other persons.
15.28.020 - Definitions. For the purposes of this
Chapter, the following definitions describe the meaning of the
terms used:
A. "Accelerated erosion" means any increase over the rate
of natural erosion as a result of land- disturbing activity.
B. "Approval" means approval by the City Engineer.
C. "Buffer zone" means a parcel or strip of land that is
required to permanently remain in an undisturbed and untouched
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condition and within which no building, clearing, grading, or
filling is permitted, except for minor maintenance necessary to
protect life and property.
D. "Clearing" means the removal of timber, brush, grass,
ground cover, or other vegetative matter from a site which exposes
the earth's surface on the site or results in the loss of forested
areas.
E. "Clearing and Grading Permit" means the written
permission of the City to the applicant to proceed with the act of
clearing, grading, filling, and /or drainage which could disturb
the land surface.
F. "Director" means the Director of Public Works or an
authorized agent of the Public Works Department.
G. "Engineer" means a professional civil engineer, licensed
by and in good standing in the State of Washington.
H. "Environmentally Sensitive Lands" include, but are not
limited to, lands identified as environmentally sensitive or
critical areas by the City in accordance with the provisions of
the State Environmental Policy Act and the Growth Management Act.
I. "Erosion" means the wearing away of the land or ground
surface by the action of wind, water, ice, gravity, or any
combination thereof.
J. "Filling" means the act of transporting or placing (by
any manner or mechanism) fill material from, to, or on any soil
surface, natural vegetative covering of soil surface, or fill
material (including temporary stockpile of material).
K. "Grading" means any act which changes the grade or
elevation of the ground surface and for the purposes of this
Chapter also includes the excavation and removal of earth
material.
L. "Land- disturbing activity" means any use of the land
that results in change in the natural cover or topography or may
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cause or contribute to erosion or sedimentation.
M. "Sedimentation" means the process of deposition of soil
and organic particles displaced, transported, and deposited by
erosive processes.
15.28.030 - Clearing and Grading Permit Required.
A. No person, corporation, or other legal entity shall make
changes or cause changes to be made in the surface of any land by
clearing, grading, filling, or drainage alteration in the City
without having first obtained a valid clearing and grading permit
from the City Engineer; except for those activities that are
exempt as described in Section 15.28.040.
B. Permits are not transferable, unless approved in writing
by the City Engineer. The transfer will only be approved when the
new applicant has demonstrated that it can and has complied with
the conditions of the permit.
15.28.040 - Permit Exemptions. Written permit
exemptions shall be issued by the City Engineer. The following
shall be exempt from the permit requirements of this Chapter,
provided that the exemptions set forth in Subsections F - I shall
not apply in situations where properties include environmentally
sensitive areas:
A. Land clearing, grading, filling, sandbagging, diking,
ditching, or similar work during or after periods of extreme
weather or other emergency conditions which have created
situations such as flooding or high fire danger that present an
immediate danger to life or property;
B. Land clearing necessitated by order of the City Council
related to the abatement of a public nuisance, where the work is
administered by the City;
C. The removal of dead trees or of diseased or damaged
trees which constitute a hazard to life or property;
D. The clearing by a public agency or a franchised utility
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within a public right -of -way or upon an easement, for the purpose
of installing and maintaining water, storm, sewer, power, cable,
or communication lines;
E. Cemetery graves;
F. Land that is one acre or less, except where an adjacent
area under the same ownership or chain of ownership has been
similarly exempted so that the combined area is greater than one
acre and erosion control has not been re- established;
G. If a building permit is issued, no additional clearing,
grading, or filling permit or associated fee will be required;
provided that the standards established in this Chapter and
pursuant hereto shall be applied to the issuance of said building
permit;
H. Developments larger than one acre in improved areas
served by paved streets, curbs, gutters, storm drains, and other
drainage facilities;
I. Work, when approved by the City Engineer, in an
isolated, self- contained area, if there is no danger to private or
public property.
15.28.050 - Permit Application. An application for a
clearing and grading permit shall be submitted on a form provided
by the City and identifying the property and owner. Other
information may be required by the City Engineer to carry out the
provisions of this Chapter.
15.28.060 - Plans and Specifications. Each application
shall be accompanied by a minimum of three (3) sets of plans and
specifications, including calculations. The plans and
specifications shall be prepared by a person familiar with the
site. For more complicated sites, the City Engineer may require
that the plans and specifications be prepared by an appropriate
qualified professional who shall have his /her signature and stamp
affixed to each set. The plans and specifications may include the
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appropriate information from the following:
A. An accurate plan of the entire site as it exists at the
time of the application, which includes:
1. All property lines;
2. Contours over the entire site (five -foot contour
intervals are standard, but other intervals may be required in
specific circumstances);
3. The date, basis, and datum of the contours;
4. A graphic representation of existing vegetation on
the site designated by its common names, the amount of bare
ground, and the amount and type of impervious material (rock and
artificial);
5. The location of all existing drainage facilities,
natural and man -made;
6. The location and estimated capacity of any areas
which impound surface water;
7. The location and estimated discharge of all visible
springs;
8. The location of all structures, utilities, and
their appurtenances, including structures and utilities on
adjacent properties when such information is reasonably available;
9. Date, north arrow, and adequate scale as approved
by the City Engineer on all maps and plans;
10. Identification of and mitigation measures for on-
site areas which are subject to severe erosion, and off -site areas
which are especially vulnerable to damage from erosion and /or
sedimentation.
B. The proposed work schedule, which details the following:
1. Sequence for clearing, grading, filling, drainage
alteration, and other land - disturbing activities;
2. On -site soil or earth material storage locations
and source of import materials, and location of the site where
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spoils will be disposed;
3. Schedule for installation and removal of all
interim erosion and sediment control measures, including
vegetative measures;
4. Schedule for construction of final improvements, if
any;
5. Schedule for the installation of required permanent
erosion and sediment control devices;
6. An outline of the methods to be used in clearing
vegetation and in storing and disposing of the cleared vegetative
matter.
C. An accurate finished grading plan of the entire site as
it would appear after the completion of work covered by the
permit, showing the following:
1. The finished contours achieved by grading (at the
same intervals as the existing contours);
2. The boundaries of all areas to remain undisturbed,
and identification and the location of all other vegetation shown
on the plan that will remain after the completion of work;
3. Drainage and related facilities to be constructed
with and as a part of the proposed work;
4. Boundaries of all areas where surface water runoff
will be retained, detained, or infiltrated;
5. The method for discharging surface water off -site,
including the provisions required to control the velocity and
direction of discharge to protect downstream properties;
6. The location of building setback lines, and
approximate limits of cuts and fills, including but not limited to
foundations, retaining walls, and driveways;
7. Location and dimensions of buffer zones and other
areas to be maintained or established;
8. The location and description of proposed erosion
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and sedimentation control devices or structures and schedule of
maintenance;
9. Off -site grading shall be noted on the plans, and
a dated letter of permission from the property owner of the land
affected shall be provided and noted on the plans.
15.28.070 - Additional Application Information. The
City Engineer may require the applicant to submit additional
information when he finds the submitted plans and specifications
and associated information are not clear enough to allow for an
adequate determination, or when special conditions are found to
exist which require specific explanation. This additional
information may include, but is not limited to, the following:
A. Hydrologic and hydraulic computations of expected storm
runoff entering and leaving the site for pre- and post- development
conditions;
B. Engineering geology and soils reports as needed for
hydrology, hydraulics, and erosion control design;
C. Erosion and Sediment Control Plan and supporting
calculations;
D. An engineer's cost estimate of the drainage facilities
and final erosion and sediment control when such information is
necessary for bonding purposes;
E. Inspection and maintenance agreement;
F. Letters of Permission: Off -site grading shall be
supported by a dated letter of permission from the affected
property owner(s);
G. A copy of the Hydraulic Permit Application issued by the
Washington Sate Department of Fisheries, if it is required.
15.28.080 - Review Criteria. The City Engineer shall
review the permit application for compliance with all City
ordinances, adopted standards, requested additional data, and
Comprehensive Plans.
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15.28.090 - Standards. No land- disturbing activity
subject to the control of this Chapter shall be undertaken except
in accordance with the following mandatory standards:
A. Protection of property: Persons and entities conducting
land - disturbing activities shall take all reasonable measures to
protect all public and private property from damage caused by such
activities.
B. Wetland buffer zone: No land- disturbing activity shall
be permitted in an approved wetland buffer zone, except as
otherwise allowed by applicable laws and permits.
C. Graded slopes and fills: The angle for graded slopes
and fills shall be no greater than the angle which can be retained
by vegetative cover or other adequate erosion control devices or
structures.
D. Ground cover: No land - disturbing activity shall be
undertaken until installation of sufficient erosion and sediment
control devices to retain the sediment generated by the activity
within the boundaries of the tract during construction upon and
development of said tract. Plantings or a permanent ground cover
shall be provided immediately after completion of grading to
sufficiently restrain erosion.
E. Use of vegetative measures: Vegetation measures using
native plants shall be used for erosion and sediment control
wherever feasible, rather than structural measures such as pipes,
structures, or other devices.
F. Environmentally sensitive areas: Construction within
environmentally sensitive areas shall be in compliance with
Chapter 15.20 PAMC Environmentally Sensitive Areas Protection
Ordinance and shall be subject to the review of the Planning
Director.
15.28.100 - Conditions. In granting any clearing and
grading permit, the City Engineer may attach the conditions
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reasonably necessary to prevent erosion and sedimentation. Such
conditions may include, but are not limited to, installing walls,
swales, drains, retention facilities, or other structures;
planting appropriate vegetation; installing erosion and sediment
control measures or devices; furnishing necessary letters of
permission and /or easements; and specifying method of performing
the work. Such items must be identified on the approved grading,
erosion, and sediment control or other required plans. In
addition, the following shall be conditions of all permits:
A. Notify the City forty -eight (48) hours before commencing
any land- disturbing activity.
B. Notify the City of completion of any control measures
within forty -eight (48) hours after their completion.
C. Obtain permission in writing from the City prior to
modifying any of the plans.
D. Install all control measures as identified in the
approved plans.
E. Maintain all road drainage systems, stormwater drainage
systems, control measures, and other facilities identified in the
plans.
F. Repair siltation or erosion damage to adjoining surfaces
and drainage ways resulting from land developing or disturbing
activities.
G. Inspect the erosion construction control measures at
least once each week during construction after each rain of 0.5
inches or more (over a 24 -hour period), and immediately make any
needed repairs.
H. Allow the City to enter the site for the purpose of
inspecting compliance with the plans or for performing any work
necessary to bring the site into compliance with the plans.
I. Keep an up -to -date, approved copy of the plans on the
site.
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J. Ensure that all workmanship and materials are in
accordance with City standards and the most recent edition of the
ashington State Specifications for Road, Bridge, and Municipal
Construction.
15.28.110 - Maintenance Responsibilities. A maintenance
schedule of constructed private facilities shall be developed for
facilities constructed and measures implemented pursuant to this
Chapter. The schedule shall set forth the maintenance to be
completed, the time period for completion, and who shall perform
the maintenance. The schedule shall be included with all required
plans and permits and shall be recorded by the property owner or
agent with the County Auditor so that maintenance responsibilities
attach to the property and shall be the duty of the property
owner(s).
15.28.120 - Permit Issuance - Expiration - Extension.
A. A clearing and grading permit shall be issued only after
compliance with the requirements of this Chapter and the deposit
with the City Treasurer of permit fees for plan review,
inspection, and related expenses as required pursuant to PAMC
15.28.130.
B. Any permit granted under this Chapter shall expire one
(1) year from the date of issuance; provided, however, that the
City Engineer may set specific limits to the permit if it is
advisable to do so. Upon a showing of good cause, a permit may be
extended for one (1) twelve -month period.
15.28.130 - Permit Fees. There shall be a non-
refundable fee established by City Council resolution in the
amount necessary to compensate the City for the expense of
reviewing and processing plans, conducting inspections, providing
for outside consulting services, and other services determined to
be necessary for the administration and enforcement of the
provisions of this Chapter.
15.28.140 - Security. The City Engineer may require the
applicant to furnish security in the form of a bond, cash escrow
account, an irrevocable letter of credit, or other security which
y be acceptable to the City in its sole discretion, in an amount
determined by the City Engineer to be sufficient to reimburse the
City if it should be come necessary for the City to enter the
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roperty to correct hazardous conditions relating to soil
stability, erosion, or environmental damage caused by failure to
complete the work or improper action.
15.28.150 - Insurance. If, in the opinion of the City
Engineer, the nature of the work is such that it may create a
hazard to human life or endanger streams or public or private
property, then the City Engineer may, before issuing the permit,
require that the applicant file a certificate of insurance. The
certificate must provide to the City satisfactory proof of the
existence of a comprehensive liability insurance policy, in an
amount and form determined necessary by the City Engineer or the
City Attorney, but in no event providing coverage of less than two
hundred thousand dollars ($200,000) for personal injury to any one
person, five hundred thousand dollars ($500,000) for injury to
more than one person arising out of the same incident, and one
hundred thousand dollars ($100,000) for property damage, against
claims arising pursuant to permits issued under this Chapter,
hether the performance be by the applicant, a subcontractor of
he applicant, or any person directly or indirectly employed by
he applicant. Additional amounts of insurance may be required by
he City Engineer in accordance with the nature of the risks
involved. Insurance must be written by a company licensed to do
I.
usiness in the State of Washington.
15.28.160 - Inspections.
A. All projects which include clearing, grading, filling,
r drainage shall be subject to inspection by the City Engineer or
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his designee, who shall be granted reasonable right of entry to
the work site by the permittee. When required by the City
Engineer, special inspection of the grading operations and special
testing shall be performed by qualified professionals employed by
the permittee. Inspections in conjunction with Hydraulic Permits
will be performed and enforced by the Washington State Department
of Fisheries or Wildlife.
B. Each site that has approved grading, erosion and
sediment control or other required plans must be inspected as
necessary to ensure that the sediment control measures are
installed and effectively maintained in compliance with the
approved plan and permit requirements. Where applicable, the
permittee must obtain inspection by the City at the following
stages:
1. Following the installation of sediment control
measures or practices and prior to any other land- disturbing
activity;
2. During the construction of sediment basins or
stormwater management structures;
3. During rough grading, including hauling of imported
or wasted materials;
4. Prior to the removal or modification of any
sediment control measure or facility; and
5. Upon completion of final grading, including
establishment of ground covers and planting, installation of all
vegetative measures, and all other work in accordance with an
approved plan or permit.
C. The permittee may secure the services of an engineer,
subject to the approval of the City Engineer, to inspect the
construction of the facilities and provide the City with a fully
documented certification that all construction is done in
accordance with the provisions of an approved, grading, erosion
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and sedimentation control or other required plan, applicable
rules, regulations, permit conditions, and specifications. If
inspection certification is provided to the City, then the normal
inspections performed by the City for the permit may be waived.
In these cases, the City shall be notified at the required
inspection points and may make spot inspections.
15.28.170 - Suspension of Permits. The City Engineer
may suspend or revoke a permit or issue a stop work order,
whenever he determines that:
A. The act or intended act of clearing, grading, or filling
has become or will constitute a hazard to persons; endangers
property; adversely affects the safety, use or stability of any
public way, drainage facility, stream or surface water, including
siltation and sedimentation;
B. The permittee has violated a provision of the permit or
of this Chapter or other City ordinances;
C. There are changes in site runoff characteristics upon
which a waiver was granted or permit was approved;
D. Construction is not in accordance with the approved
plans and specifications;
E. Noncompliance with correction notice(s) or stop work
order(s) issued for erosion or sediment controls.
15.28.180 - Completion of Work.
A. Construction Changes. Whenever changes must be made to
the original, approved plan, the changes shall be submitted to and
approved by the City Engineer in advance of the construction of
those changes.
B. Final Reports. Upon completion of the rough grading and
at the final completion of the work, the City Engineer may require
the following reports, drawings, and supplements thereto to be
prepared and submitted by the owner and /or an appropriate
qualified professional approved by the City Engineer:
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1. An as -built grading plan, including original ground
surface elevations, final surface elevations, lot drainage
patterns, and locations and elevations of all surface and
subsurface drainage facilities.
2. A soils grading and /or geologic grading report,
including locations and elevations of field density tests and
geologic features, summaries of field and other laboratory tests,
and other substantiating data and comments or any other changes
made during grading and their effect on the recommendations made
in the approved grading plan.
C. Notification of Completion. The permittee or his /her
agent shall notify the City Engineer when the grading operation is
ready for final inspection. Final approval shall not be given
until all work has been completed in accordance with the final
approved grading, erosion and sedimentation control, and other
required plans, and the required reports have been submitted and
accepted.
15.28.190 - Posting of Permit. No work shall commence
until a permit has been posted by the applicant on the subject
site at a conspicuous location. The permit shall remain posted
until the project has been completed and final inspection
approved.
15.28.200 - Administration and Enforcement. The City
Engineer is authorized and directed to administer and enforce the
provisions of this Chapter. For such purpose, he shall have the
powers as detailed in PAMC 14.01.060 of a police officer and may
appoint and deputize such officers, inspectors, assistants, and
other employees as may be necessary to carry out the duties and
functions of his office and to provide technical data for plans
and on -site follow -up inspections to assure implementation of
required plans and specifications; except that enforcement of
Hydraulic Permits shall be performed by the Department of
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Fisheries.
15.28.210 - Appeals. Any person or persons aggrieved by
any action of the City Engineer pursuant to the provisions of this
Chapter may file an appeal with the Construction Code Board of
ppeals as set forth in Chapter 14.01 PAMC.
15.28.220 - Clearing and Grading Rules and Guidelines.
Clearing and grading and related storm water management and
administrative rules and guidelines as prepared by the City
engineer are hereby adopted as set forth in Exhibits A and B,
respectively, which are attached to this Ordinance and hereby
incorporated herein by this reference. These rules and
regulations shall be filed with the City Clerk, and shall be made
available to the general public. Such rules and guidelines shall
apply to all clearing, grading, filling, and drainage activities
in the City, including activities for which permits are required
and activities which are exempt from the permit requirements of
this Chapter.
15.28.230 - Other Laws.
A. Whenever conflicts exist between Federal, State, or
local laws, ordinances, or rules, the more restrictive provision
shall apply.
B. Neither this Chapter nor any administrative decision
made under it:
1. Exempts the permittee from procuring other required
permits or complying with the requirements and conditions of such
a permit; or
2. Limits the right of any person to maintain against
the permittee at any time, any appropriate action, at law or in
equity, for relief from damages caused by the permittee arising
from the permitted activity.
15.28.240 - Removal of Dirt, Debris, or Other Material;
Sanctions.
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A. Whenever property damage is occurring or imminent as a
result of an activity inconsistent with the purpose and intent of
this Chapter, as determined by the City Engineer, the offending
person, company, or firm shall, after notice of clean -up by the
City Engineer, remove such material or make necessary revisions,
as instructed by the City Engineer, to remove the cause of the
offending activity.
B. If the person, company, or firm does not take the action
ordered by the City Engineer, such offending party shall be guilty
of a civil infraction and shall be punished as set forth in
Section 15.28.260. In addition, the City Engineer may cause the
debris and other materials to be cleaned up and /or the activity
altered. All expenses of such work, including the costs of
litigation, if necessary, and administrative costs shall be
chargeable to the owner or other person having charge of or having
ordered the activity.
15.28.250 - Public Nuisance. Any violation of the
provisions of this Chapter is declared to be a public nuisance and
may be abated through proceedings for injunction or similar relief
in superior court or other court of competent jurisdiction.
15.28.260 - Penalty. Any person, firm, or corporation,
violating any of the provisions of this Chapter, shall be deemed
guilty of a separate offense for each and every day or portion
thereof during which any violation of any of the provisions of
this Chapter is committed, continued, or permitted. Each such
offense shall be punishable by a maximum civil fine of Five
Hundred Dollars ($500).
Section 2 - Severability Clause. If any section,
sentence, clause, or phrase of this Ordinance should be held to be
invalid or unconstitutional by a court of competent jurisdiction,
such invalidity or unconstitutionality shall not affect the
validity or constitutionality of any other section, sentence,
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clause, or phrase of this Ordinance.
Section 3 - Effective Date. This Ordinance shall take
effect five (5) days after the date of publication.
PASSED by the City Council of the City of Port Angeles
at a regular meeting of said Council held on the 5th day of
January , 1993.
ATTEST:
ic _ LJ I Z) A
Becky J. pt , Cii�y Clerk
APPROVE AS TO FORM:
Craig D.Sutson, City Attorney
PUBLISHED: January 10, 1993
(By Summary)
CC.254
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EXHIBIT "A"
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
c
CHAPTER 6 - CLEARING, GRADING, FILLING, AND
DRAINAGE
6.010 GENERAL
A. APPLICABILITY
The standards contained in this chapter are promulgated pursuant to the Clearing and
Grading Ordinance of the City of Port Angeles and shall be the minimum standards for
the protection of earth and soil during any changes being made to the surface of land
through clearing, grading, filling, and /or drainage activities in the City. Where there are
conflicts or differences between these standards and City Ordinances, the City Ordinances
shall apply. These standards shall be interim measures until the City adopts the
"Stormwater Management Manual for the Puget Sound Basin ", February 1992 or current
edition prepared by the Department of Ecology. This document shall be refered to as
the "Technical Manual" in other portions of these standards. It is referenced in these
standards to address areas not specifically covered and to make sure that best
management practices (BMP's) are followed.
B. PURPOSE
The purpose of these standards is to ensure that all construction in the City of Port
Angeles is undertaken with facilities and measures as necessary to minimize the erosion
of soils and siltation of water bodies and public /private drainage facilities. The goal of
the erosion control practices specified herein is for no sediment to leave the construction
site or impact downstream or adjacent properties or the environment in general.
6.020 CLEARING AND GRADING PERMIT
A. A CLEARING AND GRADING PERMIT is required prior to any land- disturbing
activity that involves clearing, grading, filling, or drainage, unless a written
exemption is issued by the City Engineer in one of the following circumstances:
1. Land clearing, grading, filling, sandbagging, diking, ditching, or similar
work during or after periods of extreme weather or other emergency
conditions that present immediate danger to life or property.
2. Land clearing order by the City Council for abatement of a public
nuisance.
3. Removal of dead trees or of diseased or damaged trees which constitute
1
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
c
a hazard to life or property.
4. Clearing by a public agency or a franchised utility within a public right -
of -way or upon an easement, for the purpose of installing and maintaining
water, storm, sewer, power, cable, or communication lines.
5. Cemetery graves.
6. Land that is one acre or less, except where an adjacent area under the
same ownership or chain of ownership has been similarly exempted so that
the combined area is greater than one acre and erosion control has not
been re- established.
7. If a building permit is issued, no additional clearing, grading, or filling
permit or associated fee will be required; provided that the standards
established in this manual and by city ordinance shall be applied to the
issuance of said building permit.
8. Developments larger than one acre in improved areas served by paved
streets, curbs, gutters, storm drains, and other drainage facilities, as
authorized by the City Engineer.
9. Work, when approved by the City Engineer, in an isolated, self- contained
area, if there is no danger to private or public property.
NOTE: Exceptions 6 throught 9 do not apply in environmentally sensitive areas.
B. The Clearing and Grading Permit shall be effective for one year but may, with
cause shown be extended for an additional one year period. The fee schedule for
the review of plans and the permit will be set by resolution of the City Council.
While the fee schedule reflects separate review activities, only one permit for
clearing, grading, filling, and drainage will be issued per applicant. A current
schedule of the fees is included in the Appendix of this manual.
C. Permittees shall comply with the following conditions, which shall apply to all
clearing and grading permits:
1. Notify the City forty -eight (48) hours before commencing any land
disturbing activity.
2. Notify the City of completion of any control measures within forty -eight
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December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
(48) hours after their completion.
3. Obtain permission in writing from the City prior to modifying any of the
plans.
4. Install all control measures as identified in the approved plans.
5. Maintain all road drainage systems, stormwater drainage systems, control
measures, and other facilities identified in the plans.
6. Repair siltation or erosion damage to adjoining surfaces and drainage ways
resulting from land developing or disturbing activities.
7. Inspect the erosion construction control measures at least once each week
during construction after each rain of 0.5 inches or more (over a 24 -hour
period), and immediately make any needed repairs.
8. Allow the City to enter the site for the purpose of inspecting compliance
with the plans or for performing any work necessary to bring the site into
compliance with the plans.
9. Keep an up -to -date, approved copy of the plans on the site.
10. Ensure that all workmanship and materials are in accordance with City of
Port Angeles standards and the most current edition of the State of
Washington Standard Specifications for Road, Bridge and Municipal
Construction.
D. Construction within environmentially sensitive areas shall be in compliance with
Chapter 15.20 PAMC and shall be subject to the review of the Planning Director.
6.030 MINIMUM STANDARDS
A. SILTATION and EROSION CONTROL - The following are the minimum
standards for siltation and vehicular access controls during construction on a site:
1. CONSTRUCTION ACCESS CONTROL
Provide a clean hard surface for vehicles entering the construction site to
eliminate tracking soil onto the street. The access should be limited,
whenever possible, to one route. Surface materials may include quarry
spalls, crushed rock, river rock, or other non -soil or non -sand materials.
3
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
This surface shall be in place and maintained during the full period of
construction, unless otherwise approved by the City Engineer.
2. STABILIZATION OF DENUDED AREAS
All exposed and unworked soils shall be stabilized using a suitable best
management practice. (sod, vegetation, plastic covering, mulching, etc)
No land disturbing activity shall be undertaken until installation of
sufficient erosion and sediment control devices to retain the sediment
generated by the activity is provided.
Vegetation measures using native plants shall be used for erosion and
sediment control wherever feasible, rather than structural measures such
as pipes, structures, or other devices.
3. PROTECTION OF ADJACENT PROPERTIES
Adjacent properties shall be protected from sediment deposition by
appropriate use of vegetive buffer strips, sediment barriers or filters, dikes
or mulching, or combinations of measures. All reasonable measures to
protect all public and private property from damage shall be taken.
B. GRADING - The following are the minimum standards for grading unless
otherwise modified by an approved grading plan:
1. Grading shall not contribute to or create landslides, accelerated soil creep,
or settlement of soils.
2. Natural land and water features, vegetation, drainage and other natural
features of the site shall be reasonably preserved.
3. Grading shall not create or contribute to flooding, erosion, increased
turbidity, or siltation of a watercourse.
4. Groundcover and tree disturbance shall be minimized.
5. Grading operations shall be conducted so as to expose the smallest
practical area to erosion for the least possible time.
6. Grading shall not divert existing watercourses.
4
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
a
C. CUTS AND FILLS - The following are the minimum standards for cutting and
filling slopes; provided that these provisions may be waived by the City Engineer
for grading operations of a minor nature:
1. Cut slopes shall be no steeper than is safe for the intended use. Cut
slopes greater than five (5) feet in height shall be no steeper than two (2)
horizontal to one (1) vertical, except where approved retaining walls are
to be installed.
2. Filling should only occur where the ground surface has been prepared by
removal of vegetation and other unsuitable materials or preparation of
steps where natural slopes are steeper than five to one (5 to 1). Fill
slopes should not be constructed on natural slopes greater than two to one
(2 to 1).
3. Fill slopes shall be no steeper than is safe for the intended use. Fill
slopes greater than five (5) feet in height shall be no steeper than two (2)
horizontal to one (1) vertical, except where approved retaining wall are
engineered and installed.
4. Steeper cut/fills may be permitted if supported by an approved
soils /geological report.
5. Cut and fill slopes shall not encroach upon adjoining property without
written approval of the adjacent owner.
6. Cut and fill slopes shall be provided with subsurface and surface drainage
provisions to approved discharge locations as necessary to retain the slope.
7. The faces of slopes shall be prepared and maintained to control erosion.
Check dams, riprap, plantings, terraces, diversion ditches, sedimentation
ponds, straw bales, other methods shall be employed where necessary to
control erosion and provide safety. The erosion control measures shall be
initiated or installed as soon as possible and shall be maintained by the
owner.
8. Fill materials used as a structural fill shall be compacted in accordance
with the requirements applicable to the future use.
D. BUFFER ZONE - No land disturbing activity shall be permitted in an approved
wetland buffer zone, except as otherwise allowed by applicable laws and permits.
5
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
=
E. CLEAN -UP - Persons and /or firms engaged in clearing, grading, and filling, or
drainage activities shall be responsible for the maintenance of work areas free of
debris or other material that may cause damage to or siltation of existing or new
facilities or have the potential of creating a safety hazard.
6.040 TEMPORARY EROSION /SEDIMENTATION CONTROL PLAN
A. A Temporary Erosion /Sedimentation Control Plan is required in conjunction with
a Clearing and Grading Permit, unless otherwise exempted by the City Engineer.
The design of temporary erosion control measures shall reflect the site's soil
conditions, topographic features, hydrology, and weather during the construction
period and shall comply with the standards set forth herein.
B. Prior to the initial clearing and grading of any land development, provisions shall
be made to intercept all potential silt -laden runoff that could result from the
clearing and grading. The interception shall preclude any silt -laden runoff from
discharging from the proposed land development to downstream properties, unless
approved otherwise. The interception shall cause all silt -laden runoff to be
conveyed by open ditch or other means to whatever temporary facility is
necessary to remove silt from the runoff prior to its discharge.
C. Details of the siltation ponds and channels shall be submitted to the City prior to
construction. The location and profiles of the interim drainage channels may be
shown by a typical cross - section and flow direction arrows. A plan example is
shown if Figure II -5.27, Technical Manual which is attached.
D. The maximum velocities and channel slopes shall be shown on the Temporary
Erosion /Sedimentation Control Plan.
E. Check dams shall be employed or some other acceptable method to limit ditch
velocities to 5 feet per second, unless an approved revetment is placed.
F. A siltation pond shall provide a minimum of 1.5 feet of storage below the pond
discharge. The volume of the pond above the 1.5 foot storage shall be calculated
based upon the 6- month, 24 -hour storm for the area contributing runoff to the
pond. (see Figure II -5.28, Technical Manual which is attached)
G. Discharge from a siltation pond shall be directed through filter fabric or some
other acceptable filtering system before leaving the development.
6
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
H. A minimum of one foot of freeboard shall be provided for all siltation ponds.
J. The following GENERAL CONDITIONS shall be included on any plans dealing
with clearing, grading, filling or drainage activities:
EROSION /SEDEVMENTATION CONTROL PLAN GENERAL CONDITIONS
1. All workmanship and materials shall be in accordance with City of Port Angeles standards and the most
current edition of the State of Washington Standard Specifications for Road, Bridge and Municipal
Construction.
2. A preconstruction meeting may be required by the City prior to the start of construction.
3. City of Port Angeles Datum shall be used for all vertical control.
4. All approvals and permits required by the City of Port Angeles shall be obtained by the owner, applicant,
or contractor prior to the start of construction, unless otherwise approved by the Director of Public Works.
5. The City of Port Angeles construction inspector shall be notified a minimum of 48 hours in advance of
clearing and grading activities.
6. The owner and contractor shall be fully responsible for the location and protection of all existing utilities.
The contractor shall verify all utility locations prior to construction by calling Underground Locate at 1-
800 -424 -5555 a minimum of 48 hours prior to any excavation work.
7. All temporary siltation and detention ponds shall be maintained in a satisfactory condition until such time
as clearing and /or construction is completed and the permanent drainage facilities are operational.
8. The contractor shall have a copy of the approved plans at the construction site at all times.
6.050 MAINTENANCE SCHEDULE
A maintenance schedule of constructed private facilities shall be developed for the life
of any facilities and measures implemented pursuant to these standards and shall state the
maintenance to be completed, the time period for completion, and who shall perform the
maintenance. This schedule shall be included with all required plans and permits.
6.060 INSURANCE
The applicant shall comply with the insurance provisions of the Clearing and Grading
Ordinance as shown in PAMC 15.28.150.
6.070 SECURITY
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December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
The City Engineer may require the applicant to furnish security in the form of a bond,
cash escrow account, an irrevocable letter of credit, or other security which may be
acceptable to the City in its sole discretion, in an amount determined by the City
Engineer to be sufficient to reimburse the City if it should become necessary for the City
to enter the property to correct conditions relating to soil instability, erosion, or
environmental damage caused by lack of or improper completion of the work.
6.080 PRE - CONSTRUCTION MEETING
Prior to any clearing, grading, filling, and /or drainage facility construction, the
contractor may be required to conduct a pre - construction conference with the City's
inspector to coordinate the project.
6.090 INSPECTIONS
A. All projects which include clearing, grading, filling or drainage shall be subject
to inspection by the City Engineer or his designee, who shall be granted
reasonable right of entry to the work site by the permittee. When required by the
City Engineer, special inspection of the grading operations and special testing
shall be performed by qualified professionals employed by the permittee.
Inspections in conjunction with Hydraulic Permits will be performed and enforced
by the Washington State Department of Fisheries or Wildlife.
B. Each site that has approved grading, erosion and sediment control or other
required plans must be inspected as necessary to ensure that the sediment control
measures are installed and effectively maintained in compliance with the approved
plan and permit requirements. Where applicable, the permittee must obtain
inspection by the City at the following stages:
1. Following the installation of sediment control measures or practices and
prior to any other land disturbing activity;
2. During the construction of sediment basins or stormwater management
structures;
3. During rough grading, including hauling of imported or wasted materials;
4. Prior to the removal or modification of any sediment control measure or
facility; and
5. Upon completion of final grading, including establishment of ground
8
11
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
covers and planting, installation of all vegetative measures, and all other
work in accordance with an approved plan and /or permit.
C. The permittee may secure the services of an engineer, subject to the approval of
the City Engineer, to inspect the construction of the facilities and provide the City
with a fully documented certification that all construction is done in accordance
with the provisions of an approved grading, erosion and sedimentation control or
other required plan, applicable rules, regulations, permit conditions and
specifications. If inspection certification is provided to the City, then the normal
inspections performed by the City for the permit may be waived. In these cases
the City shall be notified at the required inspection points and may make spot
inspections. The engineer shall use the "Engineer's Construction Inspection
Report" form attached for certification of the construction or other similar form
approved by the City Engineer.
6.100 COMPLETION OF THE WORK
A. Construction Changes. Whenever changes must be made to the original,
approved plan, the changes shall be submitted in writing to and approved by the
City Engineer in advance of the construction of those changes.
B. Final reports. Upon completion of the rough grading and at the final completion
of the work, the City Engineer may require the following reports, drawings, and
supplements thereto to be prepared and submitted by the owner and /or an
appropriate qualified professional approved by the City Engineer:
1. An as -built grading plan, including original ground surface elevations,
final surface elevations, lot drainage patterns, and locations and elevations
of all surface and subsurface drainage facilities.
2. A soils grading and /or geologic grading report, including locations and
elevations of field density tests and geologic features, summaries of field
and other laboratory tests, and other substantiating data and comments or
any other changes made during grading and their effect on the
recommendations made in the approved grading plan.
C. Notification of completion. The permittee or his /her agent shall notify the City
Engineer when the grading operation is ready for final inspection. Final approval
shall not be given until all work has been completed in accordance with the final
approved grading, erosion sedimentation control and other required plans, and the
required reports have been submitted and accepted.
9
December 15, 1992
6.110 FILTER FABRIC FENCES
CLEARING, GRADING, FILLING, AND DRAINAGE
Filter fabric fences shall conform to the following:
A. Filter fabric shall be purchased in a continuous roll cut to the length of the barrier
to avoid use of joints. When joints are necessary, filter cloth shall be spliced
together only at a support post, with a minimum 6 -inch overlap, and securely
fastened at both ends to the post.
B. Posts shall be spaced a maximum of 6 feet apart and driven securely into the
ground (minimum of 30 inches).
C. A trench shall be excavated approximately 8 inches wide and 12 inches deep
along the line of the posts and upslope from the barrier.
D. When standard strength filter fabric is used, a wire mesh support fence shall be
fastened securely to the upslope side of the posts using heavy -duty wire staples
at least 1 inch long, tie wires or hog rings. The wire shall extend into the trench
a minimum of 4 inches and shall not extend more than 36 inches above the
original ground surface. (See attached Figure II -5.18, Technical Manual.)
E. The standard strength filter fabric shall be stapled or wired to the fence, and 20
inches of the fabric shall be extended into the trench. The fabric shall not extend
more than 36 inches above the original ground surface. Filter fabric shall not be
stapled to existing trees.
F. When extra - strength filter fabric and closer post spacing is used, the wire mesh
support fence may be eliminated. In such case, the filter fabric is stapled or
wired directly to the posts with all of the other above provisions still applying.
G. Filter fabric fences shall not be removed before the upslope area has been
permanently stabilized.
H. Filter fabric fences shall be inspected immediately after each rainfall and at least
daily during prolonged rainfall. Any required repairs shall be made immediately.
Sediment must be removed prior to reaching approximately one third the height
of the fence.
6.120 STRAW OR HAY BALE BARRIERS
Straw or hay bale barriers consist of a row of entrenched and anchored straw or hay
10
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
c
bales installed across the toe of a slope. These barriers are temporary and have a life
expectancy of 2 months or less. The purpose of this type of barrier is to a)intercept and
detain small amounts of sediment from disturbed areas of limited extent in order to
prevent sediment from leaving the site and b) decrease the velocity of sheet flows and
low level channel flows. The use of these barriers shall conform to the following:
1. Straw and hay bales may be used below areas subject to sheet and rill erosion.
The size of the drainage area shall be no greater than 0.25 acre and the length of
the slope behind the barrier shall be no greater than 100 feet. If the slope has a
gradient greater than 10 percent slope, then the length shall not be greater than
50 feet.
2. There shall be no concentration of water or possibility of a washout in a channel
above the barrier.
3. Bales shall be placed in a single row, lengthwise, on the contour, with ends of
adjacent bales tightly abutting one another.
4. All bales shall be either wire -bound or string -tied and placed with bindings
oriented around the sides rather than the tops and bottoms of the bales in order
to prevent rapid deterioration of the bindings.
5. The barrier shall be entrenched and backfilled. A trench shall be excavated the
length and width of the proposed barrier to a depth of at least 4 inches. After the
bales are staked and cracks between the bales chinked as necessary, the excavated
soil shall be backfilled against the barrier. Backfill soil shall conform to the
ground level on the downhill side and shall be built up to 4 inches against the
uphill side of the barrier.
6. Each bale shall be anchored by at least two stakes or rebars driven through the
bale. The first stake in each bale shall be driven towards the previously laid bale
in order to force the bales together. (See attached Figure II -5.20, Technical
Manual.)
6.130 PLASTIC SHEETING OR COVERING
Plastic covering is for use on bare slopes which require immediate protection from
erosion. Plastic covering shall conform to the following:
1. Plastic sheeting shall have a minimum thickness of 6 mills and shall meet
WSDOT /APWA Specification 9 -14.5.
11
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
c
2. Covering shall be installed and maintained tightly in place by using sandbags or
ties on ropes with a maximum 10 foot grid spacing in all directions. All seams
shall be taped or weighted down full length and there shall be at least a 12 inch
overlap of all seams.
3. Clear plastic covering shall be installed immediately on areas seeded between
November 1 and March 31 and remain until vegetation is firmly established.
4. When the covering is used on un- seeded slopes, it shall be kept in place until the
next seeding period.
5. Plastic covering sheets shall be buried two feet at the top of slopes in order to
prevent surface water flow beneath the sheets.
6. Proper maintenance shall be performed, including regular checks for rips and
dislodged ends.
6.140 STAIR STEPPING CUT SLOPES AND GROOVING SLOPES
Graded areas with slopes greater than 3:1 but less than 2:1 shall be roughened before
seeding. This can be accomplished in a variety of ways, including "trackwalking" or
driving a crawler tractor up and down the slope, leaving a pattern of cleat imprints
parallel to the slope contours. (See attached Figure II -5.8, Technical Manual.)
Graded areas steeper than 2:1 shall be stair - stepped with benches in order to help
vegetation become established and trap soil eroded from the slopes above. (See attached
Figure II -5.9, Technical Manual.)
6.150 EROSION CONTROL BLANKETS
Erosion blankets shall conform to the following:
Erosion blankets (nets and mats) may be used on level areas, on slopes up to 2:1, and
in waterways, with hydraulics permit approval.
1. Before installing, all needed surface runoff control measures such as
gradient terraces and sediment basins shall be in place.
2. Where soil is highly erodable, the net shall only be used in conjunction
with an organic mulch such as straw and wood fiber.
12
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
c
3. Jute net shall be heavy, uniform cloth woven of single jute yarn, which
if 36 to 48 inches wide shall weigh an average of 1.2 pounds /linear yard.
It must be so applied that it is in complete contact with the soil. If it is
not, erosion will occur beneath the net. (See attached Figure II -5.2,
Technical Manual.)
4. Netting shall be securely anchored to the soil with No. 11 gauge wire
staples at least 6 inches long.
6.160 MULCHING
Mulching provides immediate protection to exposed soils during periods of short
construction delays, steep slopes, or over winter months through the application of plant
residues and other suitable materials. Mulching shall conform to the following:
1. Mulching shall be used in areas with slopes greater than 2:1.
2. Mulching shall be used immediately after seeding or in areas which cannot
be seeded because of the season.
3. If clear plastic sheeting is not used, mulch may be applied to exposed
surface soils, including stockpiles, which shall not be final graded within
15 days.
6.170 EROSION CONTROL SEEDING
A. Erosion control seeding may be used where permanent structures are to be
installed or extensive grading of the area will occur before the establishment of
permanent vegetation. Seeding will reduce erosion and sedimentation by
stabilizing exposed soils that will not be brought to final grading or permanent
cover treatment or vegetation within 15 days of the exposure. Seed mixture shall
be as shown in the table that follows. Other seed mixtures may be used following
local supplier recommendations and approval of the City.
SEED MIXTURE
NAME
PROPORTIONS BY
WEIGHT
PERCENT
PURITY
PERCENT
GERMINATION
Redtop (Agrostis alba)
10%
92%
90%
Annual rye (Lolium multiflorum)
40%
98%
90%
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December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
Chewings fesque (festuca rubra commutata)
40%
97%
80%
(Jamestown, Banner, Shadow or Kotet
White dutch clover (Trifolium repens)
10%
96%
90%
B. Erosion control seeding shall conform to the following criteria:
1. Seed shall not be used in areas subject to wear by construction traffic.
2. Seed beds planted between May 1 and October 31 will require irrigation
and other maintenance as necessary to foster and protect the root
structure. Between October 31 and April 30, armoring of the seed bed
will be necessary using geotextiles, jute mat, or clear plastic covering.
3. Before seeding, install needed surface runoff control measures, such as
gradient terraces, swales and sediment basins„ shall be installed.
4. The seed bed shall be firm with a fairly fine surface, following surface
roughening. Perform all cultural operations across or at right angles to
the slope.
5. Fertilizers shall be used accoring to suppliers recommendations.
6. For developments adjacent to water bodies and wetlands, a fertilizer shall
be used as specified by an agronomist based upon a soil analysis to meet
the needs of the growing plants without harming the waterbody or
wetland.
7. The seed mixture in the table shall be applied at a rate of 120 lbs. /acre.
6.180 TOPSOILING
Topsoiling provides a suitable growth medium for final site stabilization with vegetation.
Preservation or importation of topsoil are the most effective methods. Topsoiling shall
conform to the following:
1. Topsoil should be applied to areas with highly dense or impermeable soils,
where mulch and fertilizer alone would not provide a suitable growth
medium and where slopes do not exceed 3:1.
2. Field exploration of the site shall be made to determine if there is surface
soil of sufficient quantity and quality to justify stripping. Topsoil shall be
14
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
friable and loamy.
3. Stripping shall be confined to the immediate construction area. A 4 to 6
inch stripping depth is commonly necessary, but depth may vary
depending on the particular soils. All surface runoff conrtol structures
shall be in place before stripping.
4. Stockpiles shall be stabilized with plastic covering or other approved
method daily between Nov. 1 and March 31. In any season, sediment
leaching from the stock piles shall be prevented.
5. Topsoil shall not be placed while in a frozen or muddy condition, when
the subgrade is excessively wet, or when conditions exist that may
otherwise be detrimental to proper grading, sodding, or seeding.
6. Previously established grades on the areas to be topsoiled shall be
maintained according to the approved plan.
6.190 STABILIZATION WITH SOD
Sod stabilizes soil, reduces damage from sediment and runoff to downstream areas, and
enhances natural beauty by establishing long -term strands of grass. Use of sod shall
conform to the following:
1. Sod shall be used on sites which can be maintained with ground equipment
(generally on slopes not exceeding 2:1).
2. Sod shall be machine cut at a uniform soil thickness of 3/4 inch at the
time of curing, not including top growth and thatch.
3. Standard size sections of sod shall be strong enough to support their own
weight and retain their size and shape when suspended by the end of a 3
foot section.
4. Sod shall not be harvested or transplanted when moisture content, either
too dry or too wet, may adversly affect its survival. Sod shall be
harvested, delivered and installed within a period of 36 hours.
6.200 CONSTRUCTION ROAD STABILIZATION
15
11
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
Construction road stabilization is used whenever rock -based roads or parking areas are
constructed, whether permanent or temporary, for use by construction traffic. This
practice provides erosion protection to subdivision roads, parking areas, and other on -site
vehicle transportation routes immediately after grading. Construction road stabilization
shall conform to the following:
1. A 12 inch depth of 4" to 8" crushed rock, gravel base, or crushed surfacing base
course shall be applied immediately after grading or the completion of utility
installation within the right -of -way. A 4 inch course of asphalt treated base
(ATB) may be used in lieu of crushed rock. (See attached Figure II -5.4,
Technical Manual.)
2. Where feasible, alternative route shall be made for construction traffic; one for
use in dry conditions, the other for use in wet conditions.
3. Temporary roads shall follow the contour of the natural terrain to the extent
possible.
4. Slope shall not exceed 15 percent.
5. Roadways shall be carefully graded to drain transversely.
6. Drainage swales shall be provided on each side of the roadway in case of a
crowned section or on one side in the case of a super elevated section.
16
December 15, 1992
CLEARING, GRADING, FILLING, AND DRAINAGE
APPENDIX
for
CHAPTER 6
CLEARING, GRADING, FILLING, AND DRAINAGE
• Engineer's Construction Inspection Report for Clearing, Grading, Filling, and Drainage
• Figure II -5.2, Orientation of Netting and Matting from the DOE Technical Manual
• Figure II -5.4, Stabilized Construction Entrance from the DOE Technical Manual
• Figure II -5.8(a & b), Heavy Equipment can be used to Mechanically Scarify Slopes from
the DOE Technical Manual
• Figure II -5.9, Stair- Stepping Cut Slopes and Grooving Slopes from the DOE Technical
Manual
• Figure II -5.18, Filter Fabric Fence Detail from the DOE Technical Manual
• Figure II -5.20, Proper Installation of a Straw Bale Barrier from the DOE Technical
Manual
• Figure II -5.27, ESC Structural Practices from the DOE Technical Manual
• Figure II -5.28, Sediment Trap from the DOE Technical Manual
• Erosion & Sediment Control Practices; Minimum Requirements for Clearing, Grading,
Filling and Drainage Activities; City of Port Angeles Handout
• Clearing and Grading Permit Application, City of Port Angeles
17
ENGINEER'S CONSTRUCTION INSPECTION REPORT
for
CLEARING, GRADING, FILLING, AND DRAINAGE
TO: CITY OF PORT ANGELES CITY ENGINEER DATE:
Project Name:
Project Number:
Location (address, or other)
POND INFORMATION:
1. Type:
2. Adequately protected from silting and compaction of infiltration surfaces during construction.
3. Outlet Type
4. Outlet works at correct elevation(s), filter fabric installed properly (if needed), etc.
5. Spillway at correct elevation, slope, adequately armored, etc.
CONVEYANCES:
1. Channels properly graded, sloped, planted, etc.
2. Storm drains at proper grade, inlets as designed, trenches as designed, pipe bedding properly prepared,
backfilling procedures correct, materials as specified, etc.
3. Roof leaders and footing drains: Do drains go to infiltration treanches as designed, pipe bedding properly
prepared, backfilling procedures correct, materials as specified, etc.
EROSION CONTROL INFORMATION:
1. Erosion facilities in place at the time specified relative to other construction.
2. Construction entrance pad in place as specified.
3. Did facilities keep sediment, mud etc, out of water bodies, wetlands, and from crowding the property boundary?
4. Are permanent erosion control measures in place and as designed?
AS BUILT DRAWINGS ATTACHED:
As a professional engineer licensed by the State of Washington, I have personal knowledge of the construction
inspection of the above named project, and I do hereby report that the project was built according to the approved
plans and specifications, except as noted above or on the "as built construction drawings ".
Signature, seal and date:
stds \engrept.c &g Dec.15, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure 11-5.2 Orientation of Netting and Matting
Shallow
Slope
On shallow slopes, strips
of netting may be applied
across the slope.
(Slopes up to 1:1)
Where there is a berm at the top of the slope,
bring the netting over the berm and anchor it
behind the berm.
Steep
Slope
1 I I
Bring netting down to a level area before
terminating the installation. Turn the
end under 6" and staple at 12" intervals.
Ditch
111
Flow
On steep slopes, apply
strips of netting parallel
to the direction of flow
and anchor securely.
(Slopes greater than 1:1)
- ----- .•.
."-V.1%.••••:',...i.y...
--...:4:••„*.;•••■•.:,,,••••:. —•:::::::::
."'"":%••••••••••:"•:•• ...:••••••
•4:4:4:•:::::4,1:::$•/..-=:::
O.@
-..70474:a._..h.4. 4,.. 41..".•,:e....:104
= . 7: ■ , ' 5 0 eiQ
..: 0 ami■ms,,.ewfx,semi.::: • , •
EndbCre::::%Z.44.1#04.03.100ii.%%g 5::="..
=-... ,...
'•-11 * a------,
.....
-I
."-MItLILITiTU-1114-1.7:0:1A1‘221i77
In ditches, apply netting
parallel to the direction
of flow. Use check slots
every 15 feet. Do not
join strips in the center
of the ditch.
FEBRUARY, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II -5.4 Stabilized Construction Entrance
G74.
PO e90*
d
c (fro loo.
.0'10
014041111
®O. `, ,�,`:, �i �r�l��/ #.4110 ► �0►
0.
R = 25' min.
12" min.
cr .o. . e
\ Of a fir J'Ce'er
't DOS eS
400, wig Y be
aO4 h
4" to 8" quarry spalls
provide full width of
ingress/egress area
FEBRUARY, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II- 5.8(a) Heavy Equipment Can Be Used
To Mechanically Scarify Slopes
undisturbed area
tread grooves of track
perpendicular to slope direction
undisturbed vegetation
diversion
dozer treads create grooves
perpendicular to slope direction
•
•
Figure II- 5.8(b) Unvegetated Slopes Should be Temporarily
Scarified to Minimize Runoff Velocities
II -5 -43
FEBRUARY, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II -5.9 Stair - Stepping Cut Slopes and Grooving Slopes
Debris from slope above
is caught by steps
Drainage
10
lit - Ili 1
40" - 501.
IIII
illy:
Water, soil, and fertilizer
are held by steps - plants
can become established on
the steps.
In = 1 _ Stair Stepping Cut Slopes
1 =_! 11 x-11 r- -111110
11117_►
41
Grooving is cutting furrows 1111Hill
along the contour of a slope.
Irregularities in the soil
surface catch rainwater and
provide some coverage of
lime, fertilizer and seed.
Grooving Slopes
II -5 -44
FEBRUARY, 1992
1
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II -5.18 Filter Fabric Fence Detail
Titer fabric material in continuous rolls;
Use staples or wire rings to attach fabric
to wire
Wire mesh support fence
for slit film fabrics
illK/ // 1
Bury bottom of filter material
in 8" by 12" trench
6' Max.
2" by 2" wood posts, standard or batter
or equivalent LA
Win mesh support fence
for slit film fabric. NN
Filter fabric
material
Provide washed gravel
badtfill or compacted
native soil as directed
by local government
Bury bottom of filter material
in 8" by 12" trench
2" by 2" wood posts, standard or better
or equivalent
i
ifl
1—C‘j
8" Min.
O
N
9
'f)
II -5 -78 FEBRUARY, 1992
iit
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II -5.20 Proper Installation of a Straw Bale Barrier
Excavate the trench.
2. Place and stake straw bales.
Wedge loose straw between
bales.
4. Backfill and compact the
excavated soil.
CONSTRUCTION OF A STRAW BALE BARRIER
Points A should be higher than point 3
PROPER PLACEMENT OF STRAW BALE BARRIER IN DRAINAGE WAY
II -5 -82
FEBRUARY, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure II -5.27 ESC Structural Practices
•
of
Wt
31
• ar
1
Sediment Trap\ Q,
Drainage Area
3 Ac.
Filter Fence
Sediment Trap
Drainage Area
3 Ac.
•
Sediment Pond
Drainage Area
<10 Ac.
Riser
Filter Fabric Fence,
----Qrainage Area <1 Ac.
NGPE
Rock Protection
Outtall
II -5 -95 FEBRUARY, 1992
STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN
Figure I1 -5.28 Sediment Trap
4' min.
1' depth of 2" - 4" rock
2' settling depth
1.5' sediment storage
CROSS SECTION
NO SCALE
Outflow channel is
constructed by
excavation
1' overflow depth
5' max.
1' depth
'Y." - 1' /a" washed gravel
filter fabric fencing
note: may be constructed by
excavation or by building a berm
overflow spillway
6' minimum width
•- ~ice
1.5' sediment storage
2' settling depth &
1' depth of 2" - 4" rock
1' depth of %" - 1'/a" washed gravel
SEDIMENT TRAP OUTLET
NO SCALE
II -5 -96
FEBRUARY, 1992
a� EROSION & SEDIMENT CONTROL PRACTICES
MINIMUM REQUIREMENTS
for
CLEARING, GRADING, FILLING AND DRAINAGE ACTIVITIES
Land alteration and disturbing activities such as clearing, grading, cutting, filling, and construction create erosion
and sedimentation which adversely affect the quality of local streams, rivers, lakes, and the Strait of Juan de Fuca.
The goal of the following MINIMUM erosion control practices is to see that no sediment leaves the construction
site. These minimum practices are to be followed for all land disturbing activities whether a separate permit is
issued or not. Generally, a separate permit will be required if the work is in an environmentally sensitive area
and /or the work involves over one acre.
(1) CONSTRUCTION SITE ACCESS: Provide a clean hard surface for vehicles entering the construction site to
eliminate tracking of soil onto the street. This access should be limited to one route, wherever possible. Surface
materials may include quarry spalls, crushed rock, river rock, or other non -soil or non -sand materials.
iaab /2
ort
+\i s }ooe s o
1, .1 f 0 o h bs
/I/ ',
0. DIR = 25' min , ��'Ar,'y7s;: •ai.` j-
12" min „km.. 1.I � „No...1,
4" to 8" quarry spells
or approved equal
Maintenance:
The entrance shall be maintained in a condition which will prevent tracking or
flow of mud onto public rights -of -way. This may require periodic top dressing r /egress area
with 2 -inch stone or other approved material as conditions demand, and repair
and/or cleanout of any structures used to trap sediment. All materials spilled,
dropped, washed, or tracked from vehicles onto roadways or into storm drains
must be removed immediately.
Provide full width of
(2) GRADING: The following are the minimum standards for grading activities:
1. Grading shall not contribute to or create landslides, accelerated soil creep, or settlement of soils.
2. Natural land and water features, vegetation, drainage and other natural features of the site shall be reasonably preserved.
3. Grading shall not create or contribute to flooding, erosion, increased turbidity, or siltation of a watercourse.
4. Groundcover and tree disturbance shall be minimized.
5. Grading operations shall be conducted so as to expose the smallest practical area to erosion for the least possible time.
6. Grading shall not divert existing watercourses.
(3) CUTS AND FILLS The following are the minimum standards for cutting and filling slopes; provided that these
provisions may be waived by the City Engineer for grading operations of a minor nature.
1. Cut slopes shall be no steeper than is safe for the intended use. Cut slopes greater than five (5) feet in height shall be no
steeper than two (2) horizontal to one (1) vertical, except where approved retaining walls are to be installed.
2. Filling should only occur where the ground surface has been prepared by removal of vegetation and other unsuitable
materials or preparation of steps where natural slopes are steeper than five to one (5 to 1). Fill slopes should not be
constructed on natural slopes greater than two to one (2 to 1).
3. Fill slopes shall be no steeper than is safe for the intended use. Fill slopes greater than five (5) feet in height shall be no
steeper than two (2) horizontal to one (1) vertical, except where approved retaining wall are engineered and installed.
4. Steeper cut/fills may be permitted if supported by an approved soils /geological report.
5. Cut and fill slopes shall not encroach upon adjoining property without written approval of the adjacent owner.
6. Cut and fill slopes shall be provided with subsurface and surface drainage provisions to approved discharge Locations as
necessary to retain the slope.
7. The faces of slopes shall be prepared and maintained to control erosion. Check dams, riprap, plantings, terraces, diversion
ditches, sedimentation ponds, straw bales, other methods shall be employed where necessary to control erosion and provide
safety. The erosion control measures shall be initiated or installed as soon as possible and shall be maintained by the
owner.
8. Fill materials used as a structural fill shall be compacted in accordance with the requirements applicable to the future use.
(4) STABILIZATION OF DENUDED AREAS: All exposed and unworked soils shall be stabilized using the best
management practice for the site, which can involve sod, vegetation, plastic covering, mulching, etc.
(5) CLEAN -UP Persons and /or firms engaged in clearing, grading, and filling, or drainage activities shall be
responsible for the maintenance of work areas free of debris or other material that may cause damage to or siltation
of existing or new facilities or have the potential of creating a safety hazard.
(6) CONTROL OF SITE RUNOFF: Adjacent properties shall be protected from sediment by installation of (a)
a silt barrier downstream of the work using a silt fence and /or hay bales; (b) construct a sump or basin with a
filtering system to accommodate the directed runoff prior to discharge to the existing drainage facilities.
STRAW BALES:
1. Secure bales with 2 stakes or rebar driven thru each bale.
2. Ends of adjacent bales shall tightly abutt one another.
Points A should be higher than point B
PROPER PLACEMENT OF STRAW BALE BARRIER IN DRAINAGE WAY
Maintenance:
• Straw bale barriers shall be inspected immediately after each runoff - producing
rainfall and at least daily during prolonged rainfall.
• Close attention shall be paid to the repair of damaged bales, end runs, and
undercutting beneath bales.
• Sediment deposits should be removed after each runoff - producing rainfall.
FILTER FENCE:
• The material used in a filter fabric fence must have sufficient strength to withstand various stress conditions and it also must have
the ability to allow passage of water while retaining soil particles. The ability to pass flow through must be balanced with the material's
ability to trap sediments.
• Monofilament and non -woven geotextiles shall have an A.O.S. of 70.
• Slit film fabrics shall have an A.O.S. of 40 to 60.
T
Fier fabric rnotorid in continuous roils:
Use .tylse or wire ring. to .ttmelt fabric
to wiry
Wks mess .uppmt fence
for eat film fabrice
11
1 ", '•.Il�iifY n �. i,aivrr it m ii r/ll irlulii
,11 , sure b.tt.rp N Mew material
i I in r by tz' trend%
a,
N 1^ I
I 6' Max. :
i perm
M 2' by 2' weed pe standard or bettor
L
.— at .qI ,.m
• Inspect immediately after each rainfall, and at least daily during prolonged rainfall. Repair as necesary.
• Sediment must be removed when it reaches approximately one third the height of the fence, especially if heavy rains are expected.
• Any sediment deposits remaining in place after the filter fence is no longer required shall be dressed to conform with the existing grade,
prepared and seeded.
IF YOU HAVE ANY QUESTIONS REGARDING THE MAINTENANCE OF THE CONSTRUCTION SITE, PLEASE CONTACT THE
PORT ANGELES PUBLIC WORKS DEPARTMENT AT 457 -0411, EXT. 120.
erosion.fly // December 15, 1992
CLEARING AND GRADING PERMIT
APPLICATION
CITY OF PORT ANGELES
APPLICANT:
APPLICANT MAILING ADDRESS:
APPLICANT PHONE NUMBER:
APPLICANT PLAN PREPARER /ENGINEER:
PREPARER ADDRESS AND PHONE:
LOCATION OF PROPOSAL:
DESCRIPTION OF PROPOSAL:
The applicant hereby affirms and commits that the information submitted for this permit application is accurate and that the applicant will comply
with the terms and conditions of the permit and the City of Port Angeles Clearing and Grading Ordinance.
(Applicant or authorized representative) (Date)
I. PERMIT EXEMPTION DUE TO:
❑ 1. Land clearing, grading, filling, sandbagging, diking, ditching, or similar work during or after periods of extreme weather or other
emergency conditions that present immediate danger to life or property, as authorized by the City Engineer.
❑ 2. Land clearing order by the City Council for abatement of a public nuisance.
❑ 3. Removal of dead trees or of diseased or damaged trees which constitute a hazard to life or property.
❑ 4. Clearing by a public agency or a franchised utility within a public right -of -way or upon an easement, for the purpose of installing
and maintaining water, storm, sewer, power, cable, or communication lines.
❑ 5. Cemetery graves.
❑ 6. Land that is one acre or less, except where an adjacent area under the same ownership or chain of ownership has been similarly
exempted so that the combined area is greater than one acre and erosion control has not been re- established.
❑ 7. If a building permit is issued, no additional clearing, grading, or filling permit or associated fee will be required; provided that the
standards established in this manual shall be applied to the issuance of said building permit.
❑ 8. Developments larger than one acre in improved areas served by paved streets, curbs, gutters, storm drains, and other drainage
facilities, as authorized by the City Engineer.
❑ 9. Work, when approved by the City Engineer, in an isolated, self- contained area, if there is no danger to private or public property.
The action has been determined to be exempt based upon the information know this date
based on the exemption as initialed above.
(City Engineer) (Date)
II. PLANS AND SPECS TO INCLUDE:
A. AN ACCURATE PLAN OF THE ENTIRE SITE AS IT EXISTS AT THE TIME OF THE APPLICATION, WHICH INCLUDES:
❑ 1. All property lines;
❑ 2. Contours over the entire site (five foot contour intervals are standard but other intervals intervals may be required in specific
circumstances);
❑ 3. The date, basis, and datum of the contours;
❑ 4. A graphic representation of existing vegetation on the site designated by its common names, the amount of bare ground, and the
amount and type of impervious material (rock and artificial);
❑ 5. The location of all existing drainage facilities, natural and man -made;
❑ 6. The location and estimated capacity of any areas which impound surface water;
❑ 7. The location and estimated discharge of all visible springs;
❑ 8. The location of all structures, utilities, and their appurtenances, including structures and utilities on adjacent properties when such
information is reasonably available;
❑ 9. Date, north arrow, and adequate scale as approved by the City Engineer on all maps and plans;
❑ 10. Identification of and mitigation measures for on -site areas which are subject to severe erosion and off -site areas which are especially
vulnerable to damage from erosion and /or sedimentation.
1
B. THE PROPOSED WORK SCHEDULE, WHICH DETAILS THE FOLLOWING:
❑ 1. Sequence for clearing, grading, filling, drainage alteration, and other land disturbing activities;
❑ 2. On -site soil or earth material storage locations and source of import materials, and location of the site where spoils will be disposed;
❑ 3. Schedule for installation and removal of all interim erosion and sediment control measures, including vegetative measures;
❑ 4. Schedule for construction of final improvements, if any;
❑ 5. Schedule for the installation of required permanent erosion and sediment control devices;
❑ 6. An outline of the methods to be used in clearing vegetation and in storing and disposing of the cleared vegetative matter.
C. AN ACCURATE FINISHED GRADING PLAN OF THE ENTIRE SITE AS IT WOULD APPEAR AFTER THE COMPLETION OF
WORK COVERED BY THE PERMIT, SHOWING THE FOLLOWING:
❑ 1. The finished contours achieved by grading (at the same intervals as the existing contours);
❑ 2. The boundaries of all areas to remain undisturbed, and identification and the location of all other vegetation shown on the plan that
will remain after the completion of work;
❑ 3. Drainage and related facilities to be constructed with and as a part of the proposed work;
❑ 4. Boundaries of all areas where surface water runoff will be retained, detained, or infiltrated;
❑ 5. The method for discharging surface water off -site, including the provisions required to control the velocity and direction of discharge
to protect downstream properties;
❑ 6. The location of building setback lines, and approximate limits of cuts and fills, including but not limited to foundations, retaining
walls, and driveways;
❑ 7. Location and dimensions of buffer zones and other areas to be maintained or established;
❑ 8. The location and description of proposed erosion and sedimentation control devices or structures and schedule of maintenance;
❑ 9. Off -site grading shall be noted on the plans, and a dated letter of permission from the property owner of the land affected shall be
provided and noted on the plans;
III. ADDITIONAL APPLICATION INFORMATION:
❑ 1. Hydrologic and hydraulic computations
❑ 2. Engineering geology and soils reports
❑ 3. Erosion and Sediment Control Plan
❑ 4. Engineering cost estimate of drainage facilities and erosion control plan
❑ 5. Inspection and maintenance agreement
❑ 6. Letter of permission for off -site work
❑ 7. Copies of other required permits
❑ 8. Other information
❑ 9. Security guaranteeing performance required in the amount of $
❑ 10. Insurance required in the amounts of $ per occurrence and $ aggregate.
IV. CONDITIONS APPLIED TO ALL PERMITS: PERMITTEES SHALL COMPLY WITH THE FOLLOWING CONDITIONS,
WHICH SHALL APPLY TO ALL CLEARING AND GRADING PERMITS:
1. Notify the City forty -eight (48) hours before commencing any land disturbing activity.
2. Notify the City of completion of any control measures within forty -eight (48) hours after their completion.
3. Obtain permission in writing from the City prior to modifying any of the plans.
4. Install all control measures as identified in the approved plans.
5. Maintain all road drainage systems, stormwater drainage systems, control measures, and other facilities identified in the plans.
6. Repair siltation or erosion damage to adjoining surfaces and drainage ways resulting from land developing or disturbing activities.
7. Inspect the construction control measures at least once each week during construction after each rain of 0.5 inches or more (over a
24 -hour period), and immediately make any needed repairs.
8. Allow the City to enter the site for the purpose of inspecting compliance with the plans or for performing any work necessary to bring
the site into compliance with the plans.
9. Keep an up -to -date, approved copy of the plans on the site.
10. Ensure that all workmanship and materials are in accordance with City of Port Angeles standards and the most current edition of the
State of Washington Standard Specifications for Road, Bridge and Municipal Construction.
V. INSPECTIONS AND SIGN -OFF:
❑ 1. Installation of sediment control measures prior to land disturbing activity
❑ 2. During construction of sediment basins or stormwater management structures
Cl 3. During rough grading, including hauling of materials
❑ 4. Prior to removal or modification of sediment control measure
❑ 5. Notice of completion received from permittee
❑ 6. At completion of final grading final vegetative establishment completion of final erosion control
measures
❑ 7. As -built grading plan required Soils grading and /or geologic grading report required
VI. PERMIT FEE CALCULATIONS:
❑ A. Grading and Filling - Plan review and permit fee
• 250 cubic yards or less (SO) and less than 4' of cut or fill • 251 -1,000 cubic yards ($22.50)
• 1,001- 10,000 cubic yards ($30) • 10,000 + cubic yards (530 +515 per 10,000 cy)
❑ B. Clearing and Drainage - Plan review and permit fee
• Less than one acre ($30) • One acre-5 acres (550) • Over 5 acres ($10 per acre)
❑ C. Additional plan review for changes, additions or revisions to approved plans at $30 per hr. reg. and $60 per hr. overtime.
jack\stds\cgpermit
December 15, 1992
1
EXHIBIT "B"
December 15, 1992
STORMWATER MANAGEMENT
CHAPTER 5 - STORMWATER MANAGEMENT
5.010 GENERAL PURPOSE AND POLICY
The standards established by this chapter are intended to represent the minimum
standards for the design and construction of storm drainage facilities. The standards are
intended to be applied by the City Engineer in deciding whether or not to approve
clearing, filling or drainage activity pursuant to Chapter 15.28 PAMC and whether or
not to approve stormwater discharge pursuant to PAMC 13.61.100 and 13.63.010. This
chapter is an interim measure until the City adopts the "Stormwater Management Manual
for the Puget Sound Basin ", February 1992 or current edition prepared by the
Department of Ecology. The above document shall be refered to as the "Technical
Manual" in other portions of these standards. It is referenced in these standards to
address areas not specifically covered and to make sure that best management practices
(BMP's) are followed.
The storm drainage system and natural conveyance that exist in the City of Port Angeles
are not sized to accommodate the runoff from the fully developed areas of the City, but
are generally sized to accommodate runoff from the streets and undeveloped property
which the storm drainage system serves. Accordingly, as private property is developed,
all development within the area must allow for on -site detention /retention and possibly
infiltration of storm water runoff. In addition, facilities must be provided to eliminate
erosion sedimentation and all floatable pollutants. These facilities usually take the form
of sedimentation basins, oil separators and piping culverts, riprap, seeding, or other
methods to prevent soil erosion.
Sizing of storm water conveyance and retention /detention systems is the responsibility
of the professional engineer retained by the developer and is subject to the approval of
the City.
Specific projects may warrant storm drainage facilities be constructed in excess of the
requirements of this chapter. Generally, when this situation occurs, the environmental
review process (SEPA) will address the requirements of additional storm drainage runoff
concerns. The City does, however, reserve the right to impose more stringent storm
drainage runoff discharge, retention/detention and infiltration criteria if the public interest
is best served.
5.020 GENERAL DESIGN STANDARDS
The design of storm drainage and /or retention/detention systems shall depend on the type
of system necessary and the local site conditions. The design elements of storm drainage
systems shall conform to the City standards contained herein, the Technical Manual, and
current design practice. The following criteria shall apply:
1
December 15, 1992
STORMWATER MANAGEMENT
c
A. DESIGN STORM CRITERIA
Stormwater Discharging to Streams or ponds
The water runoff from the site shall be limited to the peak rate of runoff from the
individual development sites to 50 percent of the existing 2 -year, 24 -hour design
storm while maintaining the existing conditions peak runoff rate for the 10 -year,
24 -hour and 100 -year, 24 -hour design storms.
Stormwater Discharging to Marine Waters via Closed Stormwater System
The water runoff from the site shall be limited to the peak rate of runoff from the
individual development sites to peak runoff rate for the 25 -year design storm,
subject to the capacity of the downstream conveyance system. Additional
detention will be required where the downstream conveyance system is
overloaded. The design of closed systems and structures shall conform with
Chapter III -2, Technical Manual.
Stormwater Conveyance Systems
Stormwater or storm drainage conveyance systems shall be designed for a 25 -year
design storm event. (See Chapter III -2, Technical Manual for guidance)
B. While the method of calculation and the responsibility for adequate sizing of the
facility rests with the engineer involved, the criteria that the City will use to judge
the adequacy of the facility are based upon the minimum computational standards
contained in Chapter III -1, Hydrologic Analysis of the Technical Manual.
C. The infiltration rate shall be based upon soils investigation and analysis for the
proposed infiltration area. Any testing shall be conducted so as to represent
antecedent saturated soil conditions. Test results shall accompany storm
calculations. Such testing shall be performed by a qualified engineer or septic
system designer certified by Clallam County. (See Chapter III -3, Technical
Manual for guidance.)
D. RETENTION /DETENTION FACILITIES:
Retention /detention facilities will be required for activities regulated by City
ordinances as follows:
1. For all development where a Clearing and Grading Permit is
required.
2. For non - permit development where the existing storm facilities are
not adequate to handle surfacewater runoff without such controls.
No retention /detention facility shall be located in an area that is used to satisfy
an open space requirement unless it enhances a recreational amenity.
Retention /detention facility design and volume calculation shall be in accordance
with Chapter III -4 of the Technical Manual. Retention /detention discussed in this
chapter will be applied by the City Engineer on a case by case basis where water
2
December 15, 1992
STORMWATER MANAGEMENT
a
quantity control is required for streambank erosion control or inadequate
downstream facilities.
E. The use of commercial parking lots for detention of storm water will be reviewed
by the City Engineer and approved or denied based on the adequacy of the
design. The detention area shall be situated away from areas of pedestrian
movement unless means for rapid closing of the areas is incorporated in the
design. The maximum depth of water in parking lot storage shall be limited to
12 inches.
The following GENERAL CONDITIONS shall be included on any plans dealing with
stormwater /storm drainage systems when a permit is required.
STORM DRAINAGE INSTALLATION GENERAL CONDITIONS
1. All workmanship and materials shall be in accordance with the City of Port Angeles standards, the current
edition of the State of Washington Standard Specifications for Road, Bridge and Municipal Construction,
and any project specific special provisions or conditions and requirements.
2. Temporary erosion /water pollution measures are required and shall comply with WSDOT /APWA
Specification 1 -07.15 as follows:
a. Soil erosion and water pollution /flood control plans shall be submitted to the City, approved by
the City, and implemented by the contractor prior to disturbing any soil on the site. Submittal and
approval of these plans shall preclude any construction activity on the site.
b. No permanent infiltration galleries shall be utilized as part of the construction temporary erosion
control and water pollution /flood activities.
c. All permanent storage and retention /detention areas used as part of the temporary erosion control
and water pollution /flood activities and conveyance systems shall be cleaned of all silts, sand and
other materials following completion of construction and the permanent facilities shall then be
completed including permanent infiltration areas.
3. A preconstruction meeting shall be held with the City prior to the start of construction.
4. City of Port Angeles Datum shall be used for all vertical control.
5. All approvals and permits required by the City of Port Angeles shall be obtained by the contractor prior
to the start of construction, unless otherwise approved by the City Engineer.
6. The contractor shall be fully responsible for the location and protection of all existing utilities. The
contractor shall verify all utility locations prior to construction by calling Underground Locate at 1 -800-
424 -5555 a minimum of 48 hours prior to any excavation work.
7. All plastic pipe and services shall be installed with continuous tracer tape installed 12" to 18" under the
final ground surface. The marker shall be plastic non - biodegradable, metal core or backing marked water
which can be detected by a standard metal detector. Tape shall be Terra Tape "D" or approved equal.
In addition, to tracer tape, force mains and curved mains shall also have a 14 gauge coated copper wire,
wrapped around the pipe, brought up, coating stripped, and tied off at the manhole ring. The tape and wire
shall be furnished and installed by the contractor.
3
December 15, 1992
STORMWATER MANAGEMENT
F
8. Temporary street patching may be allowed with the approval of the City Engineer. Temporary street
patching shall be provided by placement and compaction of 1 inch maximum asphalt concrete cold mix.
The contractor shall be responsible for the maintenance of the patch until the permanent repair is made.
9. The contractor shall provide a traffic control plan(s) as required in accordance with the Manual on Uniform
Traffic Control Devices (MUTCD).
10. The contractor shall have a copy of the approved plans at the construction site at all times.
11. All storm drain mains shall be high velocity cleaned and pressure tested prior to final paving.
12. Prior to backfilling, all storm drains and appurtenances shall be inspected and approved by the City's
inspector. Approval shall not relieve the contractor for correction of any deficiencies and /or failure as
determined by subsequent testing and inspections. It shall be the contractor's responsibility to notify the
City for the required inspections.
13. Special structures, oil /water separators and outlet controls shall be installed per plans and manufacturers'
recommendations.
14. All disturbed areas shall receive temporary and permanent erosion control in the form of vegetation
establishment such as grass seeding. A means shall be established to protect the permanent storm drain
system prior to establishment of the permanent erosion control measures. These methods shall be included
in the erosion and sediment control plans in accordance with the Clearing, Grading, Filling, and Drainage
provisions of the City of Port Angeles Design Guidelines for Development.
15. The City of Port Angeles construction inspector shall be notified a minimum of 48 hours in advance of a
tap connection to an existing main. The inspector shall be present at the time of the tap.
5.030 RETENTION /DETENTION OPEN POND FACILITIES
A. An emergency overflow system is required for all retention/ detention facilities.
B. Open retention /detention ponds and infiltration facilities shall not be located in
dedicated public road right -of -way areas.
C. Side slopes for earth -lined retention /detention ponds shall be no steeper than 3
horizontal to 1 vertical, unless otherwise approved. Flatter slopes are preferred.
D. The access road into the proposed retention /detention ponds must be no steeper
than 15 % to the control structure and 20% into the pond.
E. All retention /detention ponds not abutting a public right -of -way shall be accessible
for maintenance and operation. Access shall be provided by access easements and
shall accommodate vehicular traffic. Access shall be surfaced with a 10 -foot wide
gravel road to a minimum depth of 6 inches. Well- graded quarry rock may be
used with a 6" maximum and 1'/2" minimum aggregate, or material meeting the
ballast specifications in WSDOT /APWA specifications.
4
December 15, 1992
STORMWATER MANAGEMENT
F.
A vehicular access road must be provided to the bottom of the retention /detention
pond when the bottom width of the pond is 20 feet or greater or as required by
the City Engineer. The road shall be surfaced with rock as set forth in E above.
G. All retention /detention ponds shall have a minimum of one foot of freeboard
above the maximum design water surface.
H. Any embankment for a retention /detention pond in excess of 6 feet shall be
approved by an engineer with experience in dam design. The minimum top width
of this berm shall be 15 feet with a key section, unless otherwise approved.
I. Any embankment less than 6 feet, including 1 foot of freeboard, in depth, forming
one or more sides of a retention/ detention pond, shall have a minimum width of
6 feet.
J. All constructed and graded retention /detention ponds shall be sloped no flatter
than 0.005 FT /FT (l %) toward the outlet, for drainage. (This requirement does
not apply to pre - existing natural ponds, which are used for storm water detention.)
K. The back slopes for all earth berms shall be no steeper than 2 horizontal and 1
vertical.
L. Backup retention /detention facilities and the preservation of natural drainage ponds
are encouraged.
M. All detention ponds shall have a spillway whose top elevation shall be equal to the
maximum design water surface elevation.
N. A fence may be required around a retention /detention pond.
5.040 RETENTION /DETENTION CLOSED FACILITIES
A. A standard manhole or Type 2 catch basin is required when the depth exceeds 5
feet from the flowline (invert) of a culvert to the top of grade. A ladder is
required as per WSDOT /APWA specifications.
B. Adequate access to retention /detention facilities shall be required, i.e. that is, a
manhole at each end of a closed underground facility.
C. All metal tanks, culverts, pipes, and other metal parts of any storm drain system
shall be protected with asphalt and galvanization and shall be structurally sound
to the satisfaction of the City Engineer.
5.050 NATURAL AND CONSTRUCTED CHANNELS
5
December 15, 1992
STORMWATER MANAGEMENT
c
A. Drainage channel stabilization is required when the design flow velocities of
constructed channels exceed 5 feet per second.
B. Ditches shall have rock -lined bottoms and side slopes at the discharge point of the
storm drains or culverts. The rock shall extend for a minimum of 8 feet
downstream from the end of the storm drain culvert.
C. All unlined ditch sides and bottoms shall be seeded.
D. Natural and constructed channels shall be analyzed and designed using Chapter III -
2 of the Technical Manual.
5.060 CLOSED CONVEYANCE SYSTEMS AND STRUCTURES
A. Depth. Storm drain lines shall typically have a minimum depth of 5 feet to
provide gravity service to as many adjoining parcels as practical, adequate head
room within manholes for maintenance personnel, and vertical clearance between
water and sewer lines.
B. The crowns of culverts and /or pipes shall be matched or the 0.8 rule shall be used
at all pipe intersections in catch basins and manholes, except at drop manholes,
or unless otherwise approved. The 0.8 rule matches 0.8 the diameter of the
culverts or pipe instead of the culvert or pipe crowns.
C. Downsizing of culvert or pipe within a closed system with sizes less than 18 -inch
diameter is not permitted. Culverts or pipes larger than 18 -inch diameter may be
downsized if the capacity and entrance area are adequate.
D. Storm water entering a closed storm drain system shall be via catch basins for
debris and silt removal. (Oil /water separation may be required.)
E. Type 2 catch basins shall be used to accommodate culvert or pipes greater than
18 inches in diameter.
F. All public storm drain mains shall be at least 12 inches in diameter. All open -
ended culverts under driveways and roadways shall also be at least 12 inches in
diameter. Generally, steel (Treatment I, typical) or aluminum culverts 8 to 18
inches in diameter shall be 16 gauge and those 24 inches in diameter and larger
shall be at least 14 gauge.
G. Catch basin /curb inlet outlets connecting to the storm drain main shall be 6 inch
minimum diameter.
H. Horizontal and vertical curves in storm drains are not recommended. However,
6
December 15, 1992
STORMWATER MANAGEMENT
in cases where special conditions warrant, limited usage of such design may be
considered by the City Engineer. Radii of curvature shall be in accordance with
the recommendation of the manufacturer of the pipe.
5.070 MANHOLES
A. Precast manholes shall meet the requirements of WSDOT /APWA Standard Plan
B- 23a,b,c. Manholes constructed of other materials may be used if approved be
the City Engineer. Material specifications need to be submitted for review before
an alternate material will be considered.
B. Eccentric manhole cones shall be offset so as not to be located in the tire track or
a traveled lane and shall be in line with the manhole steps.
C. Manhole frames and covers shall be cast iron marked "Drain" and meet the
requirements of WSDOT /APWA Standard Plan B -25. Repair of defects shall not
be permitted. Manhole rings and covers shall be machine - finished or ground -on
seating surfaces so as to assure non - rocking fit in any position and
interchangeability.
D. Where lock -type castings are called for, the casting device shall be such that the
cover may be readily released from the ring and all movable parts shall be made
of non - corrosive materials and otherwise arranged to avoid possible binding.
E. All casting shall be coated with bituminous coating prior to delivery to the job
site.
F. Safety steps shall be fabricated of polypropylene conforming to ASTM D -4101,
injection molded around a 1/2 inch ASTM A -615 grade steel reinforcing bar with
anti -slip tread. Steps shall project uniformly from the inside wall of the manhole.
Steps shall be installed to form a continuous vertical ladder with rungs equally
spaced on 12 inch centers and installed per WSDOT /APWA Standard Plan B -24.
G. Manholes shall be located as follows, unless otherwise approved by the City
Engineer: (Catch basins may be used in lieu of manholes only if approved.)
1. Every change in grade or alignment of the pipe.
2. Every point of change in size or elevation of the pipes.
3. Each intersection or junction of mainline pipes.
4. Upper ends of all lateral pipes.
5. At intervals of 400 feet, where 12 inch to 15 inch pipe is used.
6. At intervals of 500 feet, where 18 inch to 30 inch pipe is used.
7. Spacing may be increased for pipe larger than 36 -inch diameter.
8. For curved alignment there shall be a manhole within 50 feet of the
downstream end.
7
December 15, 1992
STORMWATER MANAGEMENT
=
H. Cleanouts at the end of storm drains shall not be accepted as a substitute for a
manhole or catch basin.
I. Minimum slope through the manhole shall be 1 /10th of one foot from the invert
in to the invert out.
J. All manholes shall be located so that they are accessible by maintenance vehicles.
K. Manhole diameter sizing shall be based upon the number of pipes entering and
exiting the manhole and the ability to achieve transitions in the flow, adequate
shelves, and room for maintenance and television inspections, and to maintain the
strength of the manhole.
5.080 CATCH BASINS
A. Catch basin spacing shall be based upon hydraulic analysis. In no case shall the
maximum spacing be greater than 300 feet, unless otherwise approved. No
surface water shall be allowed to cross the crown of the roadway.
B. Type 1 catch basins with metal frame and No. B -2b grate WSDOT /APWA
Standard Plan shall be the standard catch basin used in the system, except where
curb inlets are required. Catch basins shall be designed and located so as to
provide the maximum efficiency of capture of storm water. All catch basins shall
have an oil separation tee installed on the outlet pipe.
C. Type 2 catch basins may only be used in place of manholes with the special
approval of the City Engineer.
D. Parking lot catch basins shall be per City Standard Drawing.
E. WSDOT /APWA Standard Plan B -26 concrete inlets may be utilized, if the
downstream inlet has a sump and oil separation tee.
5.090 THROUGH CURB INLETS
A. The standard through curb inlet shall be per City Standard Drawing - "Through
Curb Inlet Installation" using WSDOT /APWA Standard Plan No. B -2b grate.
B. Through curb inlets shall be installed at sags and where the grade is less than
0.005 FT /FT (0.05%) or where the grade exceeds 0.06 FT /FT (6.0 %).
C. A curb opening inlet No. B -2a grate may be used at sag locations.
D. Spacing for curb inlets shall be the same as for catch basins and may be used in
conjunction with catch basins.
8
December 15, 1992
STORMWATER MANAGEMENT
5.100 CULVERTS
A. Culverts shall be designed to carry the design runoff without saturating the base
course under the roadway or driveway surface.
B. The minimum size of roadside culvert shall be 12 inch diameter, unless otherwise
approved by the City Engineer. The length of the culvert shall be sufficient to
allow street access without crossing the street centerline.
C. Trash racks shall be installed at the inlets of culverts that are 24 inch diameter and
larger.
D. Concrete, ADS smooth -flow, aluminum, and metal culvert pipe may be used.
5.110 PROTECTIVE COATINGS
Metal pipe design shall take into consideration the characteristics of the soils in the area.
The standard protective coating for metal pipe shall be Treatment 1 per WSDOT /APWA
Specifications 9- 05.4(3).
5.120 TRENCH EXCAVATION
A. Clearing and grubbing, where required, shall be performed within the easement
or public right -of -way, as permitted by the City and /or governing agency. Debris
resulting from the clearing and grubbing shall be disposed of by the owner or
contractor in accordance with the terms of all applicable permits.
B. Trenches shall be excavated to the line and depth designated on the approved
plans. The trench sides shall be excavated vertically and the trench width shall
be excavated only to such widths as are necessary for adequate working space.
Exceptions to vertical walls may be made for unusual circumstances and when
specifically approved by the City Engineer. The trench shall be kept free from
water until jointing is complete. Surface water shall be diverted so as not to enter
the trench. The developer /contractor shall maintain sufficient pumping equipment
on the job to insure that these provisions are carried out.
C. The contractor shall perform all excavation of every description and whatever
substance encountered and boulders, rocks, roots, and other obstructions shall be
entirely removed or cut out to the width of the trench and to a depth of 6 inches
below the storm drain grade. The trench shall be backfilled to grade with material
satisfactory to the City inspector and thoroughly compacted.
D. Trenching and shoring operations shall not proceed more than 100 feet in advance
of pipe laying without approval of the City and shall be in accordance with
Washington Industrial Safety and Health Administration (WISHA) Rules and the
9
December 15, 1992
STORMWATER MANAGEMENT
Office of Safety and Health Administration (OSHA) Safety Standards.
E. The bottom of the trench shall be finished to grade with hand tools in such a
manner that the pipe will have bearing along the entire length of the barrel. The
bell holes shall be excavated with hand tools to sufficient size to make up the
joint.
5.130 BACKFILLING AND COMPACTION
A. Native materials excavated from the trench may not be used for backfilling the
trench, unless otherwise approved by the City Engineer.
B. In paved areas, the contractor shall use controlled density backfill per City
Standard Drawing - "Controlled Density Backfill", unless another method is
otherwise approved by the City Engineer.
C. In unpaved roadways and shoulders, the backfill shall be compacted to at least
95 % maximum density, when using granular backfill material. If the existing
material is determined by the City Engineer to be suitable for backfill, the
contractor may use the native material except that the top 8 inches of trench shall
be 2-1/2 inch minus ballast.
D. Backfill compaction shall be performed in 6 inch lifts.
E. In unpaved and unimproved areas, the backfill shall be compacted to at least 85 %
maximum density, when using granular backfill material.
5.140 STREET PATCHING AND RESTORATION
Trench restoration shall be by a patch or patch plus overlay as required by the City
Engineer.
A. All trench and pavement cuts shall be made by spade bladed jackhammer or
sawcuts. The cuts shall be a minimum of 1 foot outside the trench width for
excavation.
B. Tack conforming to emulsified asphalt grade CSS -1 per WSDOT /APWA
Specification Section 9- 02.1(6) shall be applied to the existing pavement and edge
of the cut and at cold joints prior to paving. Tack coat shall be applied as
specified in WSDOT /APWA Specification Section 5 -04.
C. Asphalt concrete Class B shall be placed on the prepared surface by an approved
paving machine and shall be in accordance with the applicable requirements of
WSDOT /APWA Specifications of Section 5.04, except that longitudinal joints
between successive layers of asphalt concrete shall be displaced laterally a
10
December 15, 1992
STORMWATER MANAGEMENT
minimum of 12 inches, unless otherwise approved by the City Engineer. Fine and
coarse aggregate shall be in accordance with WSDOT /APWA Specification
Section 9 -03.8. Asphalt concrete over 2 inches thick shall be placed in equal lifts
not to exceed 2 inches each.
D. All street surfaces, walks or driveways within the street trenching areas affected
by the trenching shall be feathered and shimmed to an extent that provides a
smooth -riding connection and expeditious drainage flow for the newly paved
surface. Shimming and feathering as required by the City Engineer shall be
accomplished be raking out the oversized aggregates from the Class B mix as
appropriate.
E. Surface smoothness shall be per WSDOT /APWA Specification Section 5- 04.3(13).
The paving shall be corrected by removal and repaving of the trench only.
F. When trenching within the roadway shoulder(s), the shoulder shall be restored to
its original or better condition.
G. The final patch shall be completed as soon as possible and shall be completed
within 30 days after first opening the trench. This time frame may be adjusted
if delays are due to inclement paving weather or other adverse conditions that may
exist. However, delaying of the final patch of overlay work is allowable only
subject to the City Engineer's approval. The City Engineer may deem it
necessary to complete the work within the 30 day time frame and not allow any
time extension. If this occurs, the contractor shall perform the necessary work
as directed by the City Engineer.
5.150 TESTING
Prior to acceptance and approval of construction, the following tests shall apply to each
type of construction:
A. Prior to acceptance of the project, the storm drain pipe shall be subject to a low
pressure air test per WSDOT /APWA Standards - 7- 17.3(4)D. The contractor
shall furnish all equipment and personnel for conducting the test under the
observation of the City's inspector. The testing equipment shall be subject to the
approval of the City.
B. The contractor shall make an air test for his own purposes prior to notifying the
City to witness the test. The acceptance air test shall be made after the trench is
backfilled and compacted and the roadway section is completed to subgrade.
C. All wyes, tees, and end of side drain stubs shall be plugged with flexible joint
caps or acceptable alternatives and securely fastened to withstand the internal test
pressures. Such plugs or caps shall be readily removable and their removal shall
11
December 15, 1992
STORMWATER MANAGEMENT
F
provide a socket suitable for making flexible jointed lateral connection or
extension.
D. The storm drain line shall be lamped with a bright light to determine if the
pipeline is laid on grade and straight alignment. If lamping the line discloses that
the line is not on line and grade then, a mandrel test in accordance with
WSDOT /APWA Specifications - 7- 17.3(4)H is required on all storm drains except
laterals.
E. If there is a lack of City inspection or a concern by the City of potential
construction difficulties on taps, connections, construction material and /or
methods, or other constructions items, the Inspector may order that testing of the
storm drain main shall include a television inspection by the contractor or the City
at the expense of the contractor. Television inspection shall be done after the air
test has passed and before the roadway is paved. Immediately prior to a television
inspection, enough water shall be run down the line so it comes out the lower
manhole. A copy of the video tape and written report shall be submitted to the
City. Acceptance of the line will be made after the tape has been reviewed and
approved by the inspector. Any tap to the existing system may also be required
to be television inspected.
5.160 CITY INSPECTIONS
All storm drain system facilities installation inspections and test observations shall be
made by the City of Port Angeles Department of Public Works. The City's inspector
shall be notified a minimum or forty -eight (48) hours in advance of commencing work
on any facility. Prior to final acceptance of all installations, the City may conduct an
inspection of all main lines by the use of television equipment. Final acceptance of storm
drain installations will not be made until tests and inspections are complete and prove
satisfactory.
5.170 UNDERGROUND UTILITY LOCATIONS
It shall be the responsibility of the contractor constructing the storm drain facilities to
verify the exact locations of all existing utilities prior to commencing any work. The
contractor shall contact the Utilities Underground Location Center, 1 -800- 424 -5555,
forty -eight (48) hours prior to commencing work.
5.180 CONNECTIONS TO EXISTING SYSTEM
A. Connections to a pipe system may only be made at a catch basin or manhole,
except for roof /footing /yard drain systems less than 8 inch in diameter with clean-
outs upstream of the connection.
12
December 15, 1992
STORMWATER MANAGEMENT
B. At the connection to the existing system, all new connections shall be physically
plugged until all tests have been completed and the City approves the removal of
the plug.
C. Connection of new storm drain mains to existing manholes shall be accomplished
by using provided knock -outs. Where knock -outs are not available, the manhole
shall be core drilled for connection by the contractor or jack - hammered by city
crews. The transition of connecting channels shall be constructed so as not to
interrupt existing flows.
D. Connection of a storm drain main to a system where a manhole is not available
shall be accomplished be pouring a concrete base and setting manhole sections.
The existing pipe shall only be cut into by city crews, unless approved otherwise.
E. Connections where an existing stub out is not available or where a new service
line is the same size as the existing main shall be accomplished by the installation
of a new manhole.
F. Taps shall not protrude into the existing main. All taps to existing mains and
manholes shall be made by city crews, unless otherwise approved. If the
contractor performs the taps, he shall notify the City's inspector at least 48 hours
prior to the tap. The tap shall be witnessed by the City's inspector.
5.190 SLOPES AND VELOCITIES
A. All storm drain pipes and culverts shall be designed and constructed to give mean
velocities, when flowing full, of not less than 2.0 feet per second based on
Manning's Formula using the appropriate "n" value for the type of pipe being
used.
B. Storm drain pipes shall be laid with uniform slope between manholes and catch
basins.
C. Where storm drains are laid on slopes of 6.0 percent or greater or where ground
water may use the trench as a conduit, the City may require that check dams be
placed along the pipe at 100 foot intervals. The spacing shall be noted on the
plans.
D. Storm drains laid on 20 percent slope or greater shall be anchored securely with
concrete anchors or other approved method. The concrete anchors shall conform
to the WSDOT /APWA Standard Plan No. B -12 and the spacing shall be as
follows:
1. 20 % to 35%, not over 36 feet center to center spacing
2. 35 % to 50%, not over 24 feet center to center spacing
13
December 15, 1992
STORMWATER MANAGEMENT
c
3. 50% and over, not over 16 feet center to center spacing.
E. Where velocities greater than 15 feet per second are expected, special provisions
such as thrust blocking and piping materials shall be made to protect against
displacement by erosion and shock.
F. The design velocities for all storm water culverts shall be shown in computations
as directed by the City Engineer.
5.200 OUTLET PROTECTION
Storm drain and culvert systems shall be designed to provide protection at the outlet of
the pipe from erosion due to the flow of the pipe. Both the area where the flow is
discharged and the fill above the outlet, if any, shall be protected with erosion control and
energy dissipation measures as necessary to match outlet conditions.
5.210 BUILDING DRAINS
A. A building drain refers to the extension from the building roof, foundation, or
parking lot facilities to the public storm drain. The minimum size pipe for
building drains in the public right -of -way is 6 -inch inside diameter.
B. The minimum size pipe for building drains shall be 4 -inch inside diameter, except
that all building drains serving commercial /industrial buildings shall be a
minimum pipe size of 8 -inch inside diameter.
C. Minimum slope on building drains shall be 2.0 percent. All such drains must
gravity into the City's storm drain system, unless otherwise approved.
D. Building drain construction shall conform to the latest edition of the Uniform
Plumbing Code and side sewers shall conform to Chapter 13 of the Port Angeles
Municipal Code.
E. A separate and independent building drain shall be constructed for every building,
where gutters are installed on the structure, except where multiple building
connections are approved by the City Engineer.
F. Maintenance of the building drain is the sole responsibility of the property owner.
G. Prior to connection of the building drain to the public storm drain a connection
permit must be obtained from the Public Works Department. During the permit
process, the City may request additional information about the type and amount
of flows anticipated in the building drain.
H. For houses on lots using roof drains where the positive drainage is to the street,
14
December 15, 1992
STORMWATER MANAGEMENT
roof drains and foundation drains shall be piped underground under the sidewalk,
through the curb, and into the gutter or use other approved methods of discharge.
(WSDOT /APWA Standard Plan No. B -20d or an approved modification.) For
lots draining away from the street, roof and foundation drains shall be piped
underground to a lateral of the storm system, into an infiltration system, or other
approved method. Roof drainage shall not be allowed to drain across the
sidewalk, nor may it be piped onto adjacent property or piped into the sanitary
sewer.
5.220 STRUCTURES CLOSE TO PIPE
No structures may be located any closer than 10 feet from a storm drain culvert and /or
mainline drain or any closer than 15 feet from the top of any channel bank.
5.230 INFILTRATION SYSTEMS
A. French drains and dry wells generally are not recommended as a means of
disposing of surface water, except for single family residences or small areas that
have an adequate infiltration rate.
B. An oil separation shall be required in conjunction with an infiltration system
collecting flows from paved areas, other than for residential single family parking.
5.240 RIGHTS -OF -WAY AND EASEMENTS
A. All retention /detention ponds may be required to be located on separate lots with
a drainage easement for maintenance. If the lot is not adjacent to a roadway, the
ten (10) foot wide pond access roadway will require an easement for unobstructed
ingress and egress between the lot and the public roadway.
B. A gate for access roads is required and shall be structurally and aesthetically
acceptable for the use and location proposed, or an acceptable alternative to
control traffic may be submitted.
C. All public - maintained storm drainage systems, including collection, conveyance,
and restrictions, shall be located in drainage easements or public rights -of -way to
the City of Port Angeles, unless otherwise approved. All drainage easements shall
be shown on construction plans and final plats, where appropriate.
D. Ditches and channels in property other than public property shall be provided with
a drainage easement sufficient in width to accommodate a 10 -foot wide access
along each side of the channel when the channel top width exceeds 30 feet. When
the channel top width is 30 feet or less, a 10 -foot wide strip for an access road
may be required only on one side.
15
December 15, 1992
STORMWATER MANAGEMENT
=
E. All storm drain lines shall be installed in public utility easements with a minimum
width of 20 feet or in public right of way. Where a storm drain is installed in a
public street, the preferred location is shown in Standard Drawing - "Standard
Locations for Underground Utilities ". The Developer shall check with the City
prior to beginning the design of the extension to determine if the City has any
preference as to the location of the storm drain.
F. If it is necessary to install a storm drain within a private road, the easement shall
be the width of the traveled surface, plus one foot each side, not to exceed 20
feet.
G. If storm drains are installed within utility easements that can not be easily accessed
for 24 hour maintenance by City crews, then no service connections will be
permitted on the main and the pipeline within the easement area shall have
manholes placed at each end of the easement.
5.250 MAINTENANCE OF PRIVATE SYSTEMS
A maintenance schedule of constructed private facilities shall be developed for facilities
constructed and measures implemented in accordance with the permit. The schedule shall
set out the maintenance to be completed, the time period for completion, and who shall
preform the maintenance. The schedule shall be included with all required plans and
permits. Maintenance responsibilities shall attach to the property and shall be the duty
of the property owner(s).
16
December 15, 1992
STORMWATER MANAGEMENT
APPENDIX
for
CHAPTER 5
STORMWATER MANAGEMENT
• Manhole - Type I (48" & 54 "); WSDOT /APWA Standard Plan B -23a
• Manhole - Type 2 (72" & 96 "); WSDOT /APWA Standard Plan B -23b
• Manhole - Type 3 (48 ", 54 ", 72" & 96 "); WSDOT /APWA Standard Plan B -23c
• Miscellaneous Manhole Details; WSDOT /APWA Standard Plan B -24
• Manhole Ring and Cover; WSDOT /APWA Standard Plan B -25
• Catch Basin Type 1; WSDOT /APWA Standard Plan B -1
• Catch Basin Type 1L; WSDOT /APWA Standard Plan B -la
• Catch Basin Type 2 (48" & 54 "); WSDOT /APWA Standard Plan B -le
• Catch Basin Type 2 (72" & 96 "); WSDOT /APWA Standard Plan B -lf
• Miscellaneous Catch Basin Details; WSDOT /APWA Standard Plan B -lz
• Solid Metal Cover for Catch Basin; WSDOT /APWA Standard Plan B -2
• Metal Frame and Grate for Catch Basin and Inlet; WSDOT /APWA Standard Plan B -2a
• Vaned Grate for Catch Basin and Inlet; WSDOT /APWA Standard Plan B -2b
• Concrete Inlet; WSDOT /APWA Standard Plan B -26
• City of Port Angeles Standard Plan - "Through Curb Inlet Installation"
• City of Port Angeles Standard Plan - "Parking Lot Catch Basin"
• City of Port Angeles Standard Plan - "Controlled Density Backfill"
17
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Construct In -field channel & shelf to
the crown
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48" & 54" TOP SLAB
be in the seat or underside
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COVER SKID DESIGN DETAIL
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6" Riser Section
with cutouts or
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b
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CATCH BASIN TYPE
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+
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C ° O - O
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constructed
c
Sta
shall not be
Basins to
note
O
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v
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+
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The bottom of the precast base section may be rounded.
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Knockout or cutout
basin wall
L
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section and
0
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0
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+ P
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accordance
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CATCH BASIN TYPE IL
i
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STANDARD
E
C D 9 L. L
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ED - + O a) c O 7
C 3 a 0 L 0 0 3 L p L Lo E O 0 0 0
a o 01 + N 0 U Q N U O C 0 0 ° L
CD CO P C C L C C 0° — + o° o o L+
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ED
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Z a 2 0 0 Q Q a 0 Y 0. Q 'h
L_ 3 L - Q 0 3
L L
Frame and Grate or Ring and Cover
Riser or Adjustment Section
Handholds
Flot slab cover
Steps and Ladder
20" X 24" o
24" diameter
N
0
v
.
•
The bottom of the precast Catch Basin may be rounded.
and cover see
c
0
c
a
0
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L
U
0
v
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+ 0
L
L
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4-
Frame and
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0
L
0
c
0
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a
m
L
m
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c
3
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a
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ti.
In each direction
NIW
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0
0
0
c
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m
v
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+
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m
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Standard Plan
base with integral riser
into riser.
t
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Separate cast In place or separate precast base
T Q Q
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w +
47
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a a) m
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to 0
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Precast Bose Joint
with ASTM
shown on
0
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V)
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V) (Jr C
o <
m Q O
N L m
W O r
t Q
O 0 0
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Frame and Grate Or Ring and Cover
shall have 3" minimum
6" minimum clear-
Riser or Adjustment Section
in riser or
4' or less.
y
C
0
L
a
0
L
0
m
L
C
y
a y
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p
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v
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a c c
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mo
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C
0 0
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C
0
4- 4-
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0 0
c
v 0
0 U
U }
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C
L
L
<
Flat slab cover
L L
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CD µV- U L c y ca
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L V) 4" Ot C L
0- 0 0. t v+
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L - t L` 0 C L
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3 0 N p v y 10 0 C
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0 V) 0 4- o D 0 t p ~ L 0 v V) g'°00
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y + C co O N 4- U C
u) } V y C p v O o p E
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t c D + C c o+ E y c f
0 Y y U p m 0'A L 11) y0 0=
r 7 m up L
m 4- 0 V) 4- 0+ Cr U D 4-
Q 0 Y a N- D L 3 L+ < 0
furnished
c
Steps and Ladder
XVw ..9Z
16
0
10
C
0
0
L
0
D
0
E
C
V
O
m
L
U
t
0
U
t
y
0
U
m
0
L
0
The bottom
ro
0 0 0
p N 0 L
L .0 0
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0 m 3
a
0 L O • v
10 0 4- co
0 0 -o 0 P
L) C + C
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4- + 00 0
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m
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CITY OF PORT ANGELES - PUBLIC WORKS DEPT.
STANDARD DETAILS
L 4th EXPANSION
a .,a1NT
A-7
• USE WSOOT DRAWING 8-2.4 AT SAGS AND
WSDOT DRAWNC 8 -28 FOR ALL OTHER LOCATIONS
1\- MATCH CUTTER LIP
OR 1' -0" MIN.
FROM FACE OF
CURB (TIP.)
ADJUSTING RIN
AS NECESSARY
EXPANSION
JOINT
NOTES:
1. OIL SEPARATOR "T"
REQUIRED AT OUTLET
UNLESS OTHERWISE
APPROVED BY CITY
ENGINEER.
2. CONCRETE CLASS J000
APPROVED BY
CITY ENGINEER :
SECTION 0-0
a 02/F
SLOPE T SLOP /E T
•
PVC PIPE EXPANSION
INSTAL LA 17ON JOINT
5" MIN.
MANHOLE ADAPTOR
CATCH BASIN TYPE 1
WSOOT DRAWING 8 -1
OLYMPIC FOUNDRY FRAME
SM 52 —A ►NTH 3/16" NON —SKID
DIAMOND PA TTERN ON TOP SURFACE.
SECTION A -A
ADJUST HOOD TO MATCH CURB
HEIGHT (J" MIN. OPEN /NC)
gil
ATE : 06/09/92
uf(VISED:
FILE NAME: CRBINLET.OWG
THROUGH CURB INLET
INSTALLATION
CITY OF PORT ANGELES - PUBLIC WORKS DEPT.
STANDARD DETAILS
ROUND OR RECTANGULAR
OUTLET PIPE SHALL
EXTEND TO THE
SHOULDER OF
THE TEE. _
A
4
PVC PIPE
INSTALLATION
6" MIN.
SECTION A -A
MANHOLE ADAPTOR
PVC TEE
(SAME DIAMETER AS
OUTLET PIPE.)
ALL NOW ANO MAMMALS 10 BE IN ACCORDANCE MINI CLNPRENT STANDARD SPEdf7CADONS
MR ROAD & AM) AILINASYPAL CONS IRUC71Oy WASNINC7QN STA1E DEPAR MEN T OF
1RANSPORFA DOP4 A1lifRICAN PUBLIC MQRKS ASSO7A DON,
APPROVED BY DATE : 06/09/92
CITY ENGINEER : EVISED :
FILE NAME: PRKLQTCaDw
CALL FOR INSPECTION
PRIOR TO BACKFILL.
PARKING LOT
CATCH BASIN
NOTES:
CITY OF PORT ANGELES - PUBLIC WORKS DEPT.
STANDARD DETAILS
6' MIA[ aVFRLAP
ASPHALT CONCRETE PAVEMENT OR
CLASS B PCC PA V£M£NT (HIGH EARL Y)
MA TCH EXISTING PAVEMENT TYPE
AND DEPTH
►):4:Ia%CIa I:g.4»M
11 =-i1 =! s 11=- 11=11
1 =H: ��4��ma/ =11 =11
11 = T :.:.::: I1= i1.
-1 i= =11:
TE!=11. =
I. =11.
11=11
-II flL11—.I1 1U i 1111`111111�111
CUTS SHALL BE SAWCUT
BEDDING
C. D_ BACKFILL SPECIFICATIONS
2600185 OF 0.375 IN. AGGREGA Tr
800 t$4 OF STANDARD CONCRETE SAND
94 CBS OF PORTLAND CEMENT
APPROIC 14 GAL. OF WA TER
VIE AMOUNT OF WA TER IS A CRITICAL FACTOR
7D SET UP TIME AND SHOULD BE ADDED A T
NYE SITE
1. ACP PATCH wide' or ROLLED AND NOT NBRA T£D.
2 TO BE USED Far ALL PA VED STREET BACKFILL L OCA TTON TO 1 '- 0 - BEHIND CURB UNLESS OTHERWISE
APPROVED IN ADOWYCE BY CITY ENGINEER.
3. toff-/ERE JOINT /S14735 THAN 4 ■-.O- THE PAVEMENT SHALL BE REMOVED TO NEAREST JO /N T.
1
CALL FOR FNW Cncw PRIOR 70
PLACING cor BACKPILL.
1
JAIL SPX AN(' NAILS 1O BE AV ACCORDANCE NM CURRENT STANDARD SpECIf7CAAOVS
FOR MAO &WOW AND AAAWOCAL CONSTIRIC'7O 1 WAS AVGIVN ST.4 r OEPARA/ENT OM
IAIISR RTA 77 v..I MMICAN PUE1X KIRKS ASSOC/AT/0V.
APPROVED BY DATE : 06/09/92
CITY ENGINEER 4.4r---REVISED :
FILE NAME: COF.DWO
CONTROLLED DENSITY BACKFILL
(CDF)
Summaries of Ordinances Adopted by the
Port Angeles City Council
on January 5, 1993
Ordinance No. 2733
This Ordinance of the City of Port Angeles amends the solid waste rates by
establishing corrected rates for the collection of refuse in non - City -owned
containers, amends Ordinance No. 2317, as amended, and Chapter 13.54 of the
Port Angeles Municipal Code. The rates are effective as of January 1, 1993.
Ordinance No. 2734
This Ordinance of the City of Port Angeles establishes regulations pertaining to
clearing, grading, filling, and drainage in the City of Port Angeles and creates
Chapter 15.28 of the Port Angeles Municipal Code.
Ordinance No. 2735
This Ordinance of the City of Port Angeles amends the Parking Ordinance to
reflect changes in State law and holiday parking enforcement dates and to increase
parking fines, amends Ordinance 2451 and Chapter 10.20 of the Port Angeles
Municipal Code, and repeals Ordinance 2728.
Ordinance No. 2736
This Ordinance of the City of Port Angeles establishes a risk management and
safety program, specifies policies and procedures therefor, and creates a new
Chapter 2.68 of the Port Angeles Municipal Code.
The full texts of the Ordinances are available at City Hall in the City Clerk's office or will be
mailed upon request. Office hours are Monday through Friday from 8:00 a.m. to 5:00 p.m.
These Ordinances shall take effect five days after the date of publication of these summaries.
Publish: January 10, 1993
Becky J. Upton
City Clerk
1