Chapter 12.16

The following words, terms, and titles, or pronouns and abbreviations used in place of them, shall be construed as defined in this article. (Ord. 483 § 1, 1980).

12.16.020 Builder.

“Builder” means the individual, firm, partnership or corporation, or combination thereof, proposing to perform, or performing work in the public right-of-way or in areas to be dedicated to public use, whether under contractual agreement or not. (Ord. 483 § 1.12, 1980).

12.16.030 Building department.

“Building department” means the building department of the city or such other agencies contracted with by the city to perform specialized building department functions. (Ord. 483 § 1.6, 1980).

12.16.040 City.

“City” means the city of Snoqualmie, King County, Washington. (Ord. 483 § 1.1, 1980).

12.16.050 City council.

“City council” means the regularly constituted council and mayor of the city. (Ord. 483 § 1.2, 1980).

12.16.060 City engineer.

“City engineer” means the engineer appointed by the city council to serve as engineer for the city. The word “engineer” is sometimes used in text as inspector. (Ord. 483 § 1.8, 1980).

12.16.070 City planning commission.

“City planning commission” means the regularly constituted planning commission of the city. (Ord. 483 § 1.4, 1980).

12.16.080 Contractor.

“Contractor” means the individual, firm, partnership, corporation, or combination thereof, proposing to perform, or performing work under contractual agreement with a developer, in the public right-of-way or in areas to be dedicated to public use, such as in a proposed plat. (Ord. 483 § 1.11, 1980).

12.16.090 Developer.

“Developer” means the individual, firm, partnership, corporation, or combination thereof, proposing to perform, performing, or having work performed under contractual agreement in the public right-of-way or in areas to be dedicated to public use, such as in a proposed plat. (Ord. 483 § 1.10, 1980).

12.16.093 Director.

“Director” means the director of parks and public works. (Ord. 1198 § 2, 2017).

12.16.095 Drainage facilities.

“Drainage facilities” means as defined in SMC 15.18.040. (Ord. 1198 § 2, 2017).

12.16.100 Drainage guidelines.

“Drainage guidelines” refers to the surface water design manual adopted in Chapter 15.18 SMC. (Ord. 1198 § 3, 2017; Ord. 483 § 1.20, 1980).

12.16.110 Inspector.

“Inspector” means the person assigned by the city to inspect the various street improvement projects, which person or combination of persons may be a member of the city’s consulting engineering firm, city engineer or the city superintendent, or any other person assigned, acting under the orders of the mayor and city council; their authority being limited to the particular duties to which they are assigned. (Ord. 483 § 1.9, 1980).

12.16.120 King County road standards.

“King County road standards” means the current road standards adopted by King County. (Ord. 483 § 1.5, 1980).

12.16.130 New construction.

“New construction” means the building of a new roadway or structure on new alignment, or the upgrading of an existing roadway or structure by the addition of one or more lane widths. New construction shall include public utilities. (Ord. 483 § 1.16, 1980).

12.16.135 Permeable pavement.

“Permeable pavement” means pervious concrete, porous asphalt, permeable pavers or other forms of pervious or porous paving material intended to allow passage of water through the pavement section. It often includes an aggregate base that provides structural support and acts as a stormwater reservoir. (Ord. 1198 § 2, 2017).

12.16.140 Private property owner.

“Private property owner” means the owner or owners of one or more parcels of land, desiring to perform work or have work performed in the public right-of-way, and shall be considered as a builder as defined in SMC 12.16.020. (Ord. 483 § 1.13, 1980).

12.16.150 Professional engineer.

“Professional engineer” means a professional engineer licensed and registered in the state of Washington. (Ord. 483 § 1.14, 1980).

12.16.160 Public works department.

“Public works department” means the public works department of the city. (Ord. 483 § 1.7, 1980).

12.16.170 Reconstruction.

The following types of projects are classed as “reconstruction,” and these design standards do not apply:

A. Modernization of an existing highway by resurfacing, widening less than a single lane width, adding shoulders or adding turn lanes at intersections. When adding turn lanes, the existing through lanes shall not be narrowed below their existing width.

B. Temporary replacement of a highway facility, which is commenced immediately after the occurrence of a natural disaster or catastrophic failure, to restore the highway for the health, welfare and safety of the public. (Ord. 483 § 1.17, 1980).

12.16.180 Registered land surveyor.

“Registered land surveyor” means a land surveyor licensed and registered as a land surveyor in the state of Washington. (Ord. 483 § 1.15, 1980).

12.16.190 Roadway width.

“Roadway width” means the portion of a highway between curbs or including shoulders, intended for vehicular use. This definition is for use in these design standards only. (Ord. 483 § 1.18, 1980).

12.16.200 Street committee.

“Street committee” means the committee, composed of members of the city council, appointed by the mayor to investigate, study and report to the city council on matters pertaining to streets and related subjects. (Ord. 483 § 1.3, 1980).

12.16.205 Two-track driveways.

“Two-track driveways,” also known as “Hollywood” or “wheel strip” driveways, means a single-lane driveway where the driving surface (i.e., pavement) is separated in the middle by a landscape strip, usually consisting of grass. (Ord. 1198 § 2, 2017).

12.16.210 Walkway.

“Walkway” means a continuous way designated for pedestrians, and separated from the through lanes for motor vehicles by a curb, space or barrier. (Ord. 483 § 1.19, 1980).

Article II. General Provisions

12.16.220 Purpose of design standards.

It is the intent of these design standards to outline the minimum requirements for streets, and related construction, in areas where new development is proposed and for improvements to existing developments. (Ord. 483 § 2, 1980).

12.16.230 Compliance.

It is recognized that deviations from these standards may be necessary on projects which have special or limiting requirements and it is herein emphasized that each project will be considered on an individual basis. The requirements of these design standards do not relieve a developer, contractor, builder, or private property owner from his responsibility to comply with the requirements of other codes, standards or ordinances applicable to the planning and construction of improvements as agreed upon with the city. (Ord. 483 § 2, 1980).

12.16.240 Applicability – Property utilizing public right-of-way.

This chapter shall apply to improvements on property other than new plats, wherein the property utilizes existing or proposed public right-of-way. Improvements shall include new buildings, remodeling, parking lots, etc., requiring construction of streets and utilities deemed necessary by the city. Necessity shall be determined by the function of the improvement, community safety and welfare, and shall include aesthetics. (Ord. 483 § 2, 1980).

12.16.250 Applicability – Remodeled building exterior.

This chapter applies if the building exterior is remodeled on one or more faces. (Ord. 483 § 2, 1980).

12.16.260 Requirements for single-family residences.

Minimum requirements for single-family residential buildings shall be installation and/or replacement of sidewalk. Development of three or more contiguous single-family residential buildings will require street construction (half or full section) complete with required utilities. (Ord. 483 § 2, 1980).

12.16.270 Requirements for commercial and multifamily buildings.

Commercial and multifamily buildings shall construct the necessary streets, sidewalks and utilities, etc., extended beyond the property as deemed necessary by the city. Water mains shall be improved to meet fire flow requirements as established by the fire marshal and the city. (Ord. 483 § 2, 1980).

12.16.280 General procedure for project approval.

A. Preapplication. Persons who wish to record a plat or to construct an improvement utilizing any public right-of-way (existing or future) shall meet with the city engineer to plan and work out the specific requirements of the proposed improvements prior to submitting an application for the improvement or the plat.

B. Improvements within Plats. All applications for improvements utilizing proposed or existing public rights-of-way that are a component of a preliminary short plat or subdivision shall be approved as a component of the respective short plat or subdivision prior to construction of any improvements.

C. Other Improvements. All other improvements utilizing proposed or existing public rights-of-way must be approved by the city engineer.

D. Other Approvals. An applicant will be required to receive the following approvals before a permit for the proposed development project will be granted:

1. Washington State Department of Social and Health Services (DSHS) approval of all projects having to do with public or private water supply systems;

2. Washington State Department of Ecology (DOE) approval of all projects having to do with public or private sewerage disposal systems;

3. Washington State Fisheries Department and Game Department approval of all projects which affect any stream, river or lake in any way whatsoever;

4. Snoqualmie city council approval of final plat map and city engineer approval of all related construction drawings (street, storm, sanitary, water, with details, etc.), subject to posting of performance bond if applicable;

5. Any other approvals that may be necessary depending on the nature and location of the proposed project. (Ord. 769 § 2, 1996; Ord. 483 § 3, 1980).

Article III. New Construction – Minimum Standards for Design of Streets

12.16.290 Structural design.

Design procedures shall conform to accepted engineering practices approved by a registered professional engineer. (Ord. 483 § 4.1(1), 1980).

12.16.300 Vertical clearance.

Vertical clearance above the paved roadway surface shall be a minimum of 16-1/2 feet. Vertical clearance of structures above the walkway surface shall be a minimum of eight feet. (Ord. 483 § 4.1(2), 1980).

12.16.310 Lateral clearance.

The lateral clearance between curb face and the closest part of any fixed object (excluding traffic-control signs and breakaway supports), shall be at least three feet. (Ord. 483 § 4.1(3), 1980).

12.16.320 Bridges.

Bridges shall be designed to the requirements set forth in the latest American Association of State Highway and Transportation Officials (AASHTO), Standard Specifications for Highway Bridges. Bridges shall have a minimum roadway width of 28 feet. Sidewalks shall be in addition. Design live loading for all bridges shall be not less than HS 20-44. (Ord. 483 § 4.1(4), 1980).

12.16.330 Roadway geometrics.

Design(s) shall be based upon accepted engineering practices and current AASHTO standards. (Ord. 483 § 4.1(5), 1980).

12.16.340 Construction specifications.

Current editions of Standard Specifications of the Washington State Department of Transportation (WSDOT), or the American Public Works Association (APWA), shall be used. In addition, the city allows the use of WSDOT’s General Special Provisions (GSPs) for Porous Hot Mix Asphalt (PHMA), Porous Warm Mix Asphalt (PWMA) and Pervious Concrete (PConcrete) developed by the Construction Materials Committee of the American Public Works Association (APWA) Washington. (Ord. 1198 § 4, 2017; Ord. 483 § 4.1(6), 1980).

12.16.350 Traffic-control devices.

All traffic-control devices shall conform to the Manual on Uniform Traffic Control Devices (MUTD), as modified by the Washington State Transportation Commission. (Ord. 483 § 4.1(7), 1980).

12.16.360 Pedestrian facilities.

There shall be a minimum four-foot (clear) surfaced walkway on each side of the street unless topography or other special conditions favor one walkway only, such as heritage trees, significant trees, and drainage facilities; special conditions warranting exceptions require approval by the director. The city will designate the minimum width and locations of walkways. (Ord. 1198 § 5, 2017; Ord. 483 § 4.1(8), 1980).

12.16.370 Bridge railings.

Where an approach rail is required, it will be made continuous with the bridge railing. Railing height for pedestrian-only traffic is three feet six inches, for bicycles only is four feet six inches, for combined is four feet six inches. When concrete barriers are used to separate vehicles from pedestrians and bicycles, the 32-inch concrete barrier shall have a metal rail extension providing a total height of four feet six inches. (Ord. 483 § 4.1(9), 1980).

12.16.380 Ramps for the handicapped.

Ramps shall be included in all construction. See RCW 35.68.075 “Curb Ramps for Physically Handicapped Required,” as amended by Ch. 137, “Sidewalk Ramps,” Washington Laws, 1977 First Extraordinary Session. (Ord. 483 § 4.1(10), 1980).

Article IV. New Construction – General Guidelines

12.16.390 Lateral clearance.

A. Location of utility poles near the edge of the right-of-way should be considered.

B. Breakaway designs for traffic-control devices and lighting should not be used where the falling object could create a hazard to pedestrian traffic.

C. Where edge of right-of-way locations are not feasible for utilities, it is desirable that all trees, utility supports, etc., be placed a uniform distance from the curb. Clearance to trees should account for estimated trunk diameter at maturity. (Ord. 483 § 4.2(1), 1980).

12.16.400 Utility location.

Except as noted under SMC 12.16.390, where applicable, local standards for utility locations such as the Snoqualmie Ridge Phase 2 Standards govern in lieu of the location requirements of this chapter. (Ord. 1198 § 6, 2017; Ord. 483 § 4.2(2), 1980).

12.16.410 Railroad grade crossings.

Flashing-light signals which indicate the approach or presence of trains should be installed at those railroad-highway grade crossings where studies by qualified engineers indicate the need of warning beyond that provided by signs and markings. (Ord. 483 § 4.2(3), 1980).

12.16.420 Storm drainage.

Storm drainage shall be managed in accordance with the requirements in Chapter 15.18 SMC. (Ord. 1198 § 7, 2017; Ord. 483 § 4.2(4), 1980).

12.16.430 Off-street Parking.

If existing conditions do not allow the construction of a street to the minimum width, consideration should be given to removing the parking lanes and constructing strategically located parking lots. (Ord. 483 § 4.2(5), 1980).

12.16.440 Safety features.

A. Guardrail installation should be considered to protect vehicle occupants where roadside obstacles cannot be removed or designed to yield upon impact.

B. Supports for traffic-control devices and lighting, including mast arm or span wires, should be designed to yield or break away under impact unless the breakaway design will endanger pedestrian or vehicular traffic.

C. Guardrails or other design features which protect people from out-of-control vehicles at locations such as playgrounds, schoolyards, and commercial areas should be considered.

D. Bridge rail designs which minimize the severity of impact and retain or redirect the encroaching vehicle should be considered. (Ord. 483 § 4.2(6), 1980).

Article V. New Construction – Design Details for City Streets

12.16.450 Neighborhood collector streets.

Design details for new neighborhood collector streets shall be as follows:

A. Function. To collect and distribute traffic from higher-type arterial streets to access streets, or directly to traffic destinations; to serve neighborhood traffic generators such as one store or small group of stores, elementary schools, churches, clubhouses, small hospitals or clinics, small apartment areas, etc.;

B. Planning Features. Should function as an arterial street only within one neighborhood, and should serve traffic only with an origin or destination within that neighborhood;

C. Access Conditions. Intersections at grade with direct access to adjacent property permitted;

D. Traffic Features. Traffic-control measures as warranted, but not to encourage traffic with trips through the neighborhood. Parking restricted as necessary.

Average Daily Traffic: 500 to 5,000

Horizontal Curvature:
	Maximum Degrees	Minimum Radius in feet
Flat terrain	8.0	715
Rolling terrain	14	410
Mountainous terrain (Superelevation required)	21	275

Maximum Grades:

Flat terrain: 7%

Rolling terrain: 10%

Mountainous terrain: 12%

These grades may be exceeded for short distances when approved by council.

Minimum 2-Lane Pavement Width: 24 ft.

Number of lanes (minimum): Two with parking

Minimum Roadway Width:
With curbs:	No parking (Not recommended)	28 ft.
	Parking one side	32 ft.
	Parking both sides (Min. for bus route)	40 ft.

New Bridges:
Roadway width (Min.)	Not less than approach roadway width
Design load (AASHTO)	HS 20-44
Vertical clearance (Min.)	16.5 ft.

Right-of-Way Width (Min.): 60 ft.

(Ord. 483 § 4.3(A), 1980).

12.16.460 Access streets.

Design details for new access streets shall be as follows:

A. Function. To provide access to adjacent property;

B. Planning Features. Should be designed and located to prevent continuous or unobstructed flow of traffic through a neighborhood;

C. Access Conditions. Intersections at grade with direct access to adjacent property;

D. Traffic Features. Traffic-control measures as warranted to provide adequate sight distance and safety.

Average Daily Traffic: Variable; usually less than 600:

Horizontal Curvature
	Maximum Degrees	Minimum Radius in feet
Flat terrain	14	410
Rolling terrain	28.5	200
Mountainous terrain (Superelevation required)	50	115

Maximum Grades:

Flat terrain: 8%

Rolling terrain: 12%

Mountainous terrain: 15%

These grades may be exceeded for short distances when approved by council.

Minimum 2-Lane Pavement Width: Varies from 22 ft. to 20 ft.

Minimum Roadway Width:
With curbs:	No parking	26 ft.
	Parking one side	30 ft.
	Parking both sides	36 ft.
	(40 ft. for bus route)

New Bridges:
Roadway width (Min.)	Greater than or equal to the approach roadway but not less than 28 ft.
Design load (AASHTO)	HS 20-44
Vertical clearance (Min.)	16.5 ft.

Right-of-Way Width (Min.): 60 ft.

(Ord. 483 § 4.3(B), 1980).

Article VI. Drainage

12.16.470 Drainage plan.

Drainage facilities on city roads shall conform to the surface water design manual adopted in Chapter 15.18 SMC. Requirements for drainage plan submittals are also included in the surface water design manual adopted in Chapter 15.18 SMC. (Ord. 1198 § 8, 2017; Ord. 483 § 5.1, 1980).

12.16.480 Storm drains in curb and gutter section.

A. Storm drainage shall be provided for curb street section whenever the length of surface drainage exceeds 300 feet on road grade extending either direction from the crest or sag of vertical curves.

B. Storm drain pipe other than pipe connecting inlets to the main storm drain shall be a minimum 12-inch diameter and of specified rubber-gasketed corrugated metal or rubber-gasketed concrete pipe. Runoff shall be computed and, if the flow requires it, larger pipe shall be used.

C. Storm drain pipe connecting inlets to the main storm drain by structure, i.e., catch basin or manhole, shall be minimum eight-inch diameter rubber-gasketed corrugated metal or rubber-gasketed concrete pipe, with a maximum length of 55 feet.

D. Connections of storm drain pipe leading from an inlet location may be made into a main storm drain without structure, subject to case-by-case approval by the engineer and subject to the following requirements:

1. The inletting structure shall be a catch basin and not a simple inlet lacking a catch or drop section.

2. Inlet-connection and main storm drain pipes shall be of same material and type, either rubber-gasketed corrugated metal or rubber-gasketed concrete pipe.

3. Length of the inlet connection shall not exceed 55 feet.

4. Standard shop-fabricated tees, wyes, and saddles shall be used, except that connections with concrete pipe may be field-tapped.

E. Zinc-coated (galvanized) corrugated iron or steel pipe shall be coated with protective Treatment 1 in accordance with Section 9‑05.4(3) of the State Standard Specifications.

F. Subject to approval by the engineer, other pipe materials and methods, such as but not limited to plastic or cast-in-place concrete pipe, may be used; provided, that conditions make it feasible, recognized specifications are available to control quality, and acceptable user experience with the product is shown.

G. The rubber gasket requirement above may be waived by the engineer if it can be shown that joint leakage will not be an adverse factor.

H. Storm drain gradients shall be such as to assure minimum flow velocity of three feet per second when flowing full.

I. Closed (underground) drain lines shall not be located with the centerline closer than five feet to any property line separating adjacent lots or tracts. A drainage easement shall be located entirely within a single lot or tract, except where linear extent of the drain line may involve additional properties. (Ord. 1198 § 8, 2017; Ord. 483 § 5.2, 1980).

12.16.490 Catch basins, manholes and inlets.

A. Maximum space on surface drainage courses between inlets or catch basins shall be 200 feet on road grades up to one and one-half percent. When the road grade is one and one-half percent to three percent, maximum spacing shall be 300 feet; when the grade is three percent or greater, maximum spacing shall be 400 feet.

B. Maximum spacing on main storm drains between access structures, whether catch basins or manholes, shall be 600 feet.

C. Curb inlets without drop section or catch may be used provided they are connected to a main storm drain by catch basin.

D. Adequate measures shall be taken to limit surface drainage from yards and roof drains so as to prevent water damage or nuisance within the right-of-way. Such measures may include but are not limited to the following:

1. Three-inch pipe laid subsurface from yard inlet to nearest catch basin or curb inlet;

2. Three-inch pipe laid from yard inlet under sidewalk and out through curb face. This method is not permissible when curb is on high side of superelevation or in any situation in which street drainage cannot be confined to gutter receiving yard runoff;

3. Eight-inch pipe stubbed from catch basin or curb inlet structure to back of sidewalk and plugged, to provide future connection to one or more yard drains. (Ord. 1198 § 8, 2017; Ord. 483 § 5.3, 1980).

12.16.500 Runoff control policies.

Repealed by Ord. 1198. (Ord. 483 § 5.4, 1980).

12.16.510 Runoff diversion.

Repealed by Ord. 1198. (Ord. 483 § 5.4(A), 1980).

12.16.520 Peak discharge control.

Repealed by Ord. 1198. (Ord. 483 § 5.4(B), 1980).

12.16.530 Oil separation devices.

Repealed by Ord. 1198. (Ord. 483 § 5.4(C), 1980).

12.16.540 Erosion and siltation control.

Repealed by Ord. 1198. (Ord. 483 § 5.4(D), 1980).

Article VII. Utilities

12.16.550 Street right-of-way primarily for traffic.

Utilities to be located within the street right-of-way shall be constructed in compliance with these standards. In their use of the right-of-way, utilities shall be given consideration after the traffic-carrying requirements of the roadway which are, namely, to provide safe, efficient and convenient passage for motor vehicles, pedestrians, and other traffic. Aesthetics shall be a consideration. As a matter of policy, undergrounding of electric utilities will be required unless waived by the planning commission and council. (Ord. 483 § 6.1, 1980).

12.16.560 Standard utility locations.

Utilities within the right-of-way on new roads or in roadways where existing topography, utilities, or storm drains are not in conflict, shall be located as shown in typical sections, and as indicated in this section. Where existing utilities or storm drains are in place, new utilities shall conform to these standards as nearly as practical and yet be compatible with the existing installations. Exceptions may be approved when necessary to meet the special requirements of overhead utilities where right-of-way space is limited, planned unit developments, short subdivisions, mobile home parks, multifamily developments and commercial developments.

A. Gas and Water Lines.

1. Shoulder and Ditch Section.

If practical: Outside of ditch line.

Otherwise: In shoulder three feet from edge of travel lane.

2. Curb and Gutter Section.

Preferable: Near gutter of curb or at distance which will clear root masses of street trees if these are present or planned for.

Otherwise: 10 feet from centerline. Mains and service connections to all lots should be completed prior to placing of surface materials.

3. Designated side of centerline to generally conform with King County. GAS: south and west; WATER: north and east.

4. Depth of Cover.

a. Water at three and a half feet minimum cover from finished grade.

b. Gas at three feet minimum cover from finished grade.

B. Sanitary Sewers. Mains located five feet south and west of centerline, side sewer cover five feet minimum from finished grade at property line, terminated inside lot.

C. Sanitary and water lines shall be separated in accordance with good engineering practice by being spaced at least 10 feet apart, horizontally.

D. Gravity systems, whether sanitary or storm drainage, shall have precedence over other systems in planning and installation.

E. Electric utilities, power, telephone, cable TV. Required: underground, either side of road, at plan location and depth compatible with other utilities and storm drains. Each utility is to file with the city its construction standards and current revisions.

F. Notwithstanding other provisions, underground systems shall be located at least five feet away from the road centerline and where they will not otherwise disturb existing survey monumentation. (Ord. 483 § 6.2, 1980).

12.16.570 Underground pipe materials and installation.

Water mains and sanitary sewer pipe installed in the public right-of-way shall conform to the provisions of Division III and Division IV of the Washington Chapter APWA Standard Specifications, current edition, except as otherwise provided in this chapter. (Ord. 483 § 6.3, 1980).

12.16.580 Scheduling of utilities installation and relocation.

A. Pole utilities and underground utilities, including service crossings, shall be installed or relocated prior to the start of road construction if planned road cuts and fills are minimal and location of road elements can be clearly indicated in advance. Otherwise such utilities, with connections, shall be installed or relocated after the subgrade has been completed but before surfacing has been placed.

B. As a matter of policy, utility trenching or transverse cuts in streets will be discouraged. They will not be permitted unless it can be shown that alternatives such as boring or jacking or relocating outside the paved area are infeasible, or unless the utility can be installed just prior to reconstruction or overlay of the road. In instances where trenching or cutting is permitted, backfilling shall be done in accordance with Section 7-04.3(3) of the State Standard Specifications and the road surface shall be restored at least equal to the existing pavement. If a firm and presentable surface even with the existing pavement is not achieved, the engineer may require remedial action such as redoing of the restoration or overlaying the backfilled trench and adjacent areas of the roadway. (Ord. 483 § 6.4, 1980).

12.16.590 General requirements.

A. It is the desire of the city to provide water and sanitary sewer service to all areas within the city limits, and in some cases beyond. If the proposed development is in reasonable proximity to existing sanitary sewers or water mains, and the existing facilities can be made adequate to handle the increased load anticipated from the new development, the developer will be required to connect to the existing facilities, and contribute to the capital improvement costs involved to make such facilities adequate.

B. All sanitary sewers shall be designed in accordance with the Washington State Department of Ecology’s “Criteria for Sewage Works Design” (Orange Book 2008), including all amendments thereto, and Chapter 5 of the Snoqualmie Ridge II Development Standards. The design and construction of sewage pump stations shall meet the following criteria; provided, the city engineer may approve deviations from these criteria when an equivalent result can be attained by alternative designs, without endangering the public health or the safety of city utility workers:

1. All sewage pump stations shall be equipped with a minimum of two submersible pumps in a wet well.

2. Each pump discharge line shall be equipped with a check valve and an isolation, full port plug valve. The check and isolation valves shall be in a separate valve vault. Check valves shall be repairable in place and readily removable. In large lift stations (1,000,000 gallons per day and larger), check valves shall be above ground in a control building.

3. The wet well shall be sized to match the sewage flow demands and pump characteristics of that pump station.

4. All metals within or upon the wet well, including guide rods and guide cables, shall be stainless steel. Ductile/cast iron or aluminum may be used for some parts (pump housings, etc.) if approved by the city engineer. Hatches shall be aluminum, odor tight and at least three feet above the base flood elevation.

5. The wet well shall be equipped with an appropriately sized vent attached to the control building and terminating a minimum of one foot above the ridge of the roof.

6. Odor control equipment shall be required in large lift stations located within 200 feet of residential, institutional, or commercial land uses.

7. A magnetic flow meter shall be installed on the discharge line of large lift stations.

8. A building shall be provided for electrical controls, telemetry and auxiliary power. It shall be large enough to provide adequate space for operation and maintenance of the equipment. In large lift stations, the building shall also enclose the wet well valves, check valves, diesel tank and odor control equipment.

9. The building walls shall be eight-inch split face, reinforced CMU (concrete masonry units), khaki or natural color. Vacant cells shall be filled with perlite or vermiculite insulation. Other durable, low maintenance material may be used only as approved by the city engineer.

10. The building roof shall be standing seam steel with a 25-year warranty, hemlock green, and with R-19 insulation in the ceiling.

11. Auxiliary power shall be supplied by an appropriately sized resident generator set powered by a natural gas engine. In large lift stations or where natural gas is unavailable, the generator set shall be powered by diesel engine.

12. Auxiliary power shall be controlled by an automatic switch for power failure, a timer for automated exercising, telemetry and local hand.

13. The building shall be equipped with powered cross-ventilation that operates during generator operation. Louvers shall open upon power failure.

14. The pump control panel shall have:

a. A front panel mounted “start, stop, auto” switch for each pump and a switch to manually select the lead and lag pumps;

b. The ability to accept lead/lag selection as a discrete signal from the telemetry panel;

c. A dry contract output for use by the telemetry system to indicate each pump that has been called to run; and

d. A phase failure relay to shut down pumps and dry contact status output to the telemetry panel.

15. A telemetry panel shall be designed, provided and installed to monitor input and output signals as required by the city engineer.

16. Field sensors shall be provided and connected to the telemetry panel as directed by the city engineer as follows:

a. Limit switches shall be connected to each check valve;

b. An “operator in trouble” button with dry contacts shall be located in the house;

c. A motion detecting intrusion switch with dry contacts shall be located in the house;

d. A smoke detector shall be located in the house.

17. The headquarters SCADA software shall be modified to include all signals provided by the RTU and pump control panel required above.

18. Software shall include database development, screens, reporting, integration with maintenance and alarm software now or hereafter used by the city.

C. All water mains shall be designed in accordance with the State of Washington Department of Social and Health Services, Division of Health. Water mains shall be flushed, disinfected and flushed again. Water samples shall be taken and analyzed in accordance with the requirements of the State Division of Health prior to the connection of any service lines.

D. All proposed utilities, together with construction details, shall be submitted on plan and profile paper to the city engineer for approval, and shall be stamped by a professional engineer, licensed to practice in the state of Washington.

E. All drainage easements, utility easements, and slope easements required inside and outside the platted area shall be submitted with final plans for approval. (Ord. 1198 § 10, 2017; Ord. 812 § 1, 1998; Ord. 483 § 6.5, 1980).

Article VIII. Roadside Features

12.16.600 Driveways.

A. Permissible dimensions, slope and detail shall be as indicated on drawings and as further specified in the following subsections.

B. Conditions of Approval of New Driveways.

1. Driveways directly giving access onto arterials may be denied if alternate access is available.

2. All abandoned driveway areas on any street shall be removed and the curbing and sidewalk, or shoulders and ditch section shall be properly restored.

3. Maintenance of driveway approaches and all sidewalks shall be the responsibility of the owner whose property they serve.

4. For a commercial establishment on a shoulder and ditch type road, where development of adjoining lands and highway traffic assume rural characteristics as determined by the engineer, the following rule shall apply: The entire frontage area shall be graded and paved to the property line with asphalt, Portland cement concrete, or permeable pavement. Surface drainage shall be intercepted and carried in a closed system. Access control to the property by means of a six-inch curbing will be required.

C. Location of New Driveways.

1. A residential driveway is one that normally services one parcel. A driveway serving more than one parcel shall be classed as a commercial driveway or a private street.

2. On frontage 75 feet or less, no more than one driveway shall be constructed. On frontages over 75 feet, two or more driveways may be permitted, subject to approval by the engineer.

3. No portion of driveway width shall be allowed within five feet of extensions of property lines in residential areas or nine feet in commercial areas except that driveways may utilize full width of narrow access right-of-way to property if this provides the only access to the lot being served.

4. The maximum change in driveway grade shall be:

On crest vertical curves: eight percent per 10 feet;

On sag vertical curves: 12 inches per 10 feet.

D. Existing driveways may be reconstructed as they exist provided such reconstruction is compatible with the reconstructed road.

E. Notwithstanding any other provisions, driveways shall not be allowed where they are determined by the engineer to create a hazard or impede the operation of traffic on the roadway.

F. Two-track driveways are allowed in residential settings. (Ord. 1198 § 11, 2017; Ord. 483 § 7.1, 1980).

12.16.610 Rock retaining walls.

A. Rock retaining walls may be used for the containment of cut or fill embankments up to a maximum height of eight feet in stable soil conditions which will result in no significant foundation settlement or outward thrust upon the walls. For heights over eight feet or when soil is unstable, a structural wall of acceptable design shall be used.

B. Materials.

1. Size categories shall include:

Two-man rocks (300 to 600 pounds), 13 feet in least dimension;

Three-man rocks (800 to 1,200 pounds), 16 feet in least dimension; and

Four-man rocks shall be used for bottom course rock in all rock retaining walls over six feet in height.

2. The rock material shall be as nearly rectangular as possible. No stone shall be used which does not extend through the wall. The rock material shall be hard, sound, durable and free from weathered portions, seams, cracks and other defects. The rock density shall be a minimum of 160 pounds per cubic foot.

C. The retaining wall shall be started by excavating a trench, not less than six inches or more than one foot in depth below subgrade in excavation sections or below the existing ground level in embankment sections.

D. Rock selection and placement shall be such that there will be minimum voids and, in the exposed face of the wall, no open voids over six inches across in any direction. The final course shall have continuous appearance and be placed to minimize erosion of the backfill material. The larger rocks shall be placed at the base of the rockery so that the wall will be stable and have a stable appearance. The rocks shall be placed in a manner such that the longitudinal axis of the rock shall be at right angles or perpendicular to the rockery face. The rocks shall have all inclining faces sloping to the back of the rockery. Each course of rocks shall be seated as tightly and evenly as possible on the course beneath. After setting each course of rock, all voids between the rocks shall be chinked on the back with quarry rock to eliminate any void sufficient to pass a two-inch square probe.

E. The wall backfill shall consist of quarry spalls with a maximum size of four inches and a minimum size of two inches. This material shall be placed to an eight-inch minimum thickness between the entire wall and the cut or fill material. The backfill material shall be placed in lifts to an elevation approximately six inches below the top of each course of rocks as they are placed, until the uppermost course is placed. Any backfill material on the bearing surface of one rock course shall be removed before setting the next course.

F. When a sidewalk is to be built over a rock retaining wall, the top of the wall shall be sealed and leveled with a cap constructed of cement concrete, Class C, in accordance with the applicable provisions of Section 6-02 of the State Standard Specifications, but with reduced water content resulting in slump of not over two inches. (Ord. 483 § 7.2, 1980).

12.16.620 Side slopes.

A. Side slopes shall be constructed no steeper than 1-1/2:1 on fill slopes and 1:1 on cut slopes. Flatter slopes are preferred and may be required by the engineer if there are indications that the earth is unstable and subject to sliding or sloughing.

B. Slide slopes shall be stabilized by grass sod or seeding, or by other planting or surfacing materials acceptable to the engineer.

C. Furnish city easements for side slopes in the form prescribed by the city. (Ord. 483 § 7.3, 1980).

12.16.630 Street trees and landscaping.

Repealed by Ord. 1052. (Ord. 483 § 7.4, 1980).

12.16.640 Survey monuments.

A. Monuments shall be placed at all street intersections including intersections with cul-de-sacs, and at all points of curvature and points of tangency. All monuments shall be set in concrete and be provided with cast-iron frames and covers.

B. All existing survey control monuments which are disturbed, lost, or destroyed during surveying or building shall be replaced by the responsible surveyor or builder at the developer’s expense.

C. Survey control monuments shall be placed or replaced in accordance with recognized good practice in land surveying. (Ord. 483 § 7.5, 1980).

Article IX. Inspection

12.16.650 Approval of plans prior to commencement of work.

Work performed in the construction or improvement of city streets, whether by or for a private developer, by city forces, or by city contractor, shall be done to the satisfaction of the engineer and in accordance with approved plans. It is emphasized that no work may be started until such plans are approved. Any revision to such plans shall be approved by the engineer and inspectors before being implemented. (Ord. 483 § 8.1(A), 1980).

12.16.660 Engineer – Authority.

The engineer or other designated city personnel shall have authority to enforce the standards as well as other referenced or pertinent specifications. He will appoint assistants, and inspectors as necessary to inspect the work and they will exercise such authority as the engineer may delegate. (See definition of “inspector.”) (Ord. 483 § 8.1(B), 1980).

12.16.670 State standards to apply.

Provisions of Section 1-05 of the State Standard Specifications shall apply. (Ord. 483 § 8.1(C), 1980).

12.16.680 Street inspections.

On all street construction, inspections will be done by the engineer and/or his designated inspectors. Unless otherwise instructed by the city engineer, inspections will be made as follows:

A. Inspection No. 1. Prior to clearing and construction, if site has a high potential for sediment transport;

B. Inspection No. 2. During construction to verify proper installation and maintenance of required erosion and sediment controls in accordance with the surface water design manual adopted in Chapter 15.18 SMC;

C. Inspection No 3. All underground storm drains, sanitary sewers and water mains at stage that trenching and placing of pipe is in progress up to completion, but prior to cover. Inspection shall include checking for proper grade, alignment, bedding condition, testing of pipelines, connections to existing facilities, and to include proper backfill and compaction;

D. Inspection No. 4. General roadway, at different construction stages of drainage system, underground utilities, and roadway grading until suitable subgrade is complete, including gravel ballast if required;

E. Inspection No. 5. General roadway, at state that crushed gravel surfacing or base course has been placed, as well as curbing and sidewalk;

F. Inspection No. 6. General roadway, while paving is in progress;

G. Inspection No. 7. Final air testing of sewer installation in plats after all other utilities have been installed and plat improvements are complete;

H. Inspection No. 8. Overall roadway, final, after paving, and all necessary cleanup;

I. Inspection No. 9. Permanent drainage facilities, upon completion of construction and prior to final approval to ensure proper installation of permanent drainage facilities;

J. Structural Inspections. At critical stages of foundation, placement and assembly of components, and final completion and test, as directed by the engineer. (Ord. 1198 § 12, 2017; Ord. 483 § 8.2, 1980).

12.16.690 Developers required to notify.

The developer shall notify the city engineer in advance of each required inspection. Failure to comply will necessitate additional and appropriate testing and certification by a commercial materials laboratory. Costs of such testing and certification shall be borne by the developer. At the time that such action is directed by the engineer, no further work will be permitted on the development until all tests have been completed and all corrections have been made, to the satisfaction of the engineer. (Ord. 483 § 8.3, 1980).

12.16.700 Revisions to inspection sequence.

If the developer believes that the inspection sequence indicated in SMC 12.16.690 does not fit the requirements of his project, he should make his request to the engineer in sufficient time to permit revision of the inspection schedule. (Ord. 483 § 8.4, 1980).

Article X. Deposits, Fees and Obligations to the City

12.16.710 Cash deposits.

A cash deposit shall be placed with the city as a guarantee fund to assure completion of all obligations in respect to fees charged for conferences, plan checks, field inspection, transfer of ownership, and all other functions performed in processing such improvements from concept to acceptance by the city. The cash deposit shall be retained (if not otherwise utilized), by the city up to the date of acceptance of the improvements by the city. This deposit may be used by the city to satisfy any outstanding obligations as to city expenses incurred (particularly including the city’s consulting engineer and other professional advisors), which obligations are not paid within 30 days of invoiced date of consultant or professional advisor, or which obligations are outstanding at time of city accepting the improvement. Furthermore, the city reserves the right to suspend any further work on the improvements should the developer fail to make timely payments of all invoices billed, and/or upon failure to reimburse the funds withdrawn from the deposit. The developer will be reimbursed all deposit money remaining after all obligations are satisfied at time of acceptance of improvement. No reimbursement will be made for incomplete improvements and the city reserves the right, after one year of inactivity by developer, to dispense such funds as it desires to any related city fund, or expense. The amount of cash deposit for each development shall be $1,000 or more established from time to time by council action. The deposit is intended to assure monthly payments of city expenses as described above and does not indicate in any manner the total fees for the project, which fees usually vary indirectly with the developer’s ability to execute the performance of his total project. (Ord. 483 § 9.1, 1980).

12.16.720 Checking fees.

A checking fee will be assessed for checking plat maps. A checking fee will be assessed for checking preliminary plans and later the detailed construction drawings (plan-profiles, etc.) covering all utilities and proposed street improvements. Fees will vary for each development and the city will bill the developer for the work performed by the city engineer and city inspector and any other city staff members utilized in checking the plans for conformance with the city standards. Billing will be based on an hourly charge in accordance with the time spent by each advisor in checking the project. (Ord. 483 § 9.2, 1980).

12.16.730 Inspection fees.

Inspection fees will be assessed by the engineer through the city for time spent in inspecting the construction of utilities, street improvements and the testing associated therewith. Work will also include assistance in transferring ownership of utilities from the developer to the city. Total fees for the inspection phase and transfer of ownership will vary for each development. The city will bill the developer for the work performed and will bill on an hourly basis in accordance with the time required for these items of inspection to complete the project. (Ord. 483 § 9.3, 1980).

12.16.740 Developer agreement.

A developer agreement shall be entered into between the city and the person or firm desiring to extend, revise or replace water and/or sewer utilities where allowed by city ordinances, or to construct, reconstruct streets, etc., within the city limits. The agreement particularly applies to development of plats, but is also applicable to those improvements required for certain remodeling of buildings and new construction of buildings within the city limits. The developer agreement includes the required cash deposits, fees and other obligations to the city as indicated within this article to perform the work in compliance with these standards. (Ord. 483 § 9.4, 1980).

12.16.750 Performance bond.

For work performed in public rights-of-way the developer shall post a performance bond. Within the plat or development, no performance bond will be required unless the plat is to be recorded with the county and/or property is to be sold prior to completion of all the work. The amount of the bond shall in all instances be resolved on an individual basis, and shall be for the “fair cost amount” as set by the city. In lieu of this bond requirement, the developer may deposit the cash equivalent in a savings account as an assignment of funds in lieu of the bond requirement. (Ord. 483 § 9.5, 1980).

12.16.760 Guarantee bond.

A one-year guarantee bond or its equivalent in cash shall be posted in the manner and style prescribed by the city prior to the plat being recorded with the county and/or prior to the property being sold. Service connections cannot be made until this requirement is fulfilled. Unless stated otherwise, the one-year guarantee on utilities is a guarantee on all workmanship and materials of the utility for a period of one year from the date of acceptance of the plat and its improvements, not one year from completion of installation of improvements. Prior to acceptance of the one-year guarantee, the developer shall maintain and operate all utilities. In a similar manner, all streets shall be guaranteed for two years from the date of acceptance of the plat and its improvements and drainage facilities shall have a two-year performance bond per SMC 15.18.100. (Ord. 1198 § 13, 2017; Ord. 483 § 9.6, 1980).

12.16.770 Standard forms.

Standard forms, when applicable, for the developer agreement, performance bond and guarantee bond, etc., shall be furnished by the city. (Ord. 483 § 10, 1980).

12.16.780 Design standard detail and drawings.

The city engineer shall prepare, update and maintain standard design detail and drawings supplementing and illustrating the design standards as referred to in this chapter. Drawings shall be modified, added to, or deleted, all as determined by the city engineer, in accordance with good engineering practice. (Ord. 812 § 2, 1998; Ord. 483 § 11, 1980).

Article XI. Violations

12.16.790 Misdemeanor – Penalty.

Any violations of this chapter shall be a misdemeanor and shall be punishable by a fine not to exceed $500.00 or imprisonment in the city jail not to exceed six months, or by both fine and imprisonment. (Ord. 483 § 12, 1980).

Chapter 12.16STREET DESIGN STANDARDS

12.16.010 Generally.