CITY OF TIFFIN, IOWA

TABLE OF CONTENTS

PART 1 — GENERAL

PART 2 — SIDEWALKS AND TRAILS

PART 3 — DRIVEWAYS

PART 4 — ALLEYS

PART 5 — STREETS

PART 6 — UTILITY WORK AND OTHER CONSTRUCTION WITHIN

PUBLIC RIGHT-OF-WAY

PART 7 — WATER DISTRIBUTION SYSTEM

PART 8 — SANITARY SEWERS

PART 9 — STORM SEWERS AND STORM WATER MANAGEMENT FACILITIES

PART 10 — EROSION CONTROL

PART 11 — (RESERVED) TRAFFIC CONTROL SIGNALS

PART 12 — ROADWAY LIGHTING

PART 13 — FENCING REQUIREMENTS

PART 1 - GENERAL

1.01 ABOUT THESE STANDARDS:

These Design Standards are based on a standard developed by a team of private and public sector engineers for use in the design of most common public improvements, most development activities and utility work within the public right-of-way. The intent of the joint effort was to set a standard of design for the Metropolitan Area that is consistent, effective, efficient and protects public safety. The standards in this document have been modified to meet the needs of the City of Swisher, Iowa.

These standards are updated on a regular basis, so it is important to have the current edition.

1.02 HOW TO USE THESE STANDARDS:

The standards contained in this document are organized into sections covering specific areas of design. It will often be necessary to use a number of sections for the design of a single project. For instance, the design of a street may require the use of standards on streets, sidewalks, storm sewers, traffic control signals and erosion control.

These standards are a guide for design, but not a substitute for good engineering. It is the obligation of the designer to use these standards responsibly and professionally to produce designs conforming with commonly accepted engineering practices and the Code of Professional Conduct. It will at times be desirable and/or necessary to vary from the standards in this document to produce a good product. When the need arises, please refer to the following section on variances.

It should also be noted that while one of the goals of this document was to develop uniform design standards for the metropolitan area, some standards continue to vary from community to community. Be sure to use the standard specifically drafted for the City of Swisher when working in this community.

1.03 VARIANCES:

When it becomes necessary or desirable to vary from the standards presented in this document, a variance may be requested from the City Engineer. Such a request shall be made in writing and will include:

1. The standard to be varied.

2. The proposed variation.

3. Justification for the variance.

A written response will be given within seven business days of the request. A variance determination may be appealed to the City Council.

1.04 AMENDMENTS

Amendments to these standards may be requested by writing the City Engineer with details and justification for an amendment. The City Engineer representing the City will meet periodically to discuss proposed amendments and make recommendations to the City Council.

1.05 WHOM DO I CONTACT?:

There are references made throughout this document to the "City Engineer." This is the engineer employed by the community, public official or engineering consultant retained by the community that functions as the local engineering authority.

Questions regarding these design standards should be directed to:

Michael W. Hart. P.E.

Hart-Frederick Consultants P.C.

902 East 2nd Avenue

Coralville, Iowa 52241

Tel: (319) 351-6709

Fax: (319) 351-7038

PART 2 - SIDEWALKS AND TRAILS

2.01 APPROVALS AND PERMITS:

A. A sidewalk construction permit must be obtained from the City for all sidewalk construction not associated with the construction of a new house or business for which a building permit has been obtained. However, the standards set forth in this document apply to all sidewalk construction.

B A 5-year maintenance bond covering defective materials and workmanship is required for all sidewalk and trail improvements.

2.02 TRAFFIC CONTROL

A. The contractor shall provide barricades to protect pedestrians.

2.03 WIDTH AND LOCATION:

A. Sidewalk width shall be as defined in Table 2.1, except as noted in Section 2.05.

TABLE 2.1

Local

4’

Collector

4’

Arterial

4’ / 8’¹

Commercial

As directed by the City Engineer

Industrial

4’

Major Bridges

4’ / 8’¹

¹A 4’ walk will be generally be required on both sides, however the City Engineer may require a 8’ walk on one side in special circumstances.

B. Sidewalks shall be located 1 foot from the property line, except in areas in which a different offset is required to match existing walks.

C. No sidewalks shall extend to the street perpendicular to the curb except at intersections and designated mid-block crossings. Such existing sidewalks removed for construction or maintenance activities shall not be replaced.

D. Sidewalks are generally required on both sides of all streets.

2.04 CROSS SLOPE:

A. All sidewalks shall slope to the street at a rate of 2%.

B. The street edge of the sidewalk and across the parkway shall slope to the street at a rate of ½ of an inch vertical per horizontal foot.

2.05 MATCHING EXISTING WALKS:

A. The width and location of a new sidewalk shall be varied to match the width and location of existing sidewalks in the area. However, the sidewalk width shall not be less than 4 feet.

B. Sidewalk cross slope may be varied through a gradual transition to match existing adjoining walks. Contact the Engineer if existing adjoining walks vary significantly from existing standards.

2.06 MATERIAL AND THICKNESS:

A. Sidewalks shall be constructed of Portland cement concrete conforming to the Iowa Department of Transportation C-3 mix. Maximum slump shall be 3 inches.

B. Sidewalks 4 to 6 feet wide shall have a minimum thickness of 4 inches. Sidewalks greater than 6 feet wide shall have a minimum thickness of 5 inches with fiber mesh reinforcement or 6 inches of non-reinforced concrete. Sidewalks crossing driveways shall be a minimum of 6 inches thick.

2.07 JOINTS AND FINISH:

A. Sidewalks shall have a uniform texture with a broom finish.

B. Tooled joints are permissible on sidewalks less than 6 feet in width. Framing is permissible on sidewalks with tooled joints and should match existing adjoining sidewalk. The maximum depth of framing shall be 1/16 inch. The joint depth shall be ¼ the sidewalk thickness. The joint width shall be minimized.

C. Sawed joints are permissible for all widths of sidewalks. The joint depth shall be ¼ the sidewalk thickness.

D. Sidewalk joints shall be delineated through driveways.

E. Sidewalk joints shall be spaced to form square panels.

F. Preformed expansion joints, ½ inch in width, shall be installed at approximately 100 foot intervals or at property lines in new residential or commercial construction. Preformed expansion joints, ½ inch in width, shall be installed adjacent to all curb ramps. See Figure 2.1.

G. Stamped imprints indicating the contractor and date of construction are permissible. The size of the imprint shall be limited to less than 4"x6" and the depth to less than ¼".

H. Apply curing compound immediately following finishing operations or cure with moist burlap for not less than 24 hours.

2.08 CURB RAMPS:

A. Sidewalks shall provide a curb ramp for accommodation of the handicapped at all intersections and designated crossings.

B. Curb ramps shall be located in line with the public sidewalk as shown in Figure 2.1; or unless preapproved by the City.

C. Curb ramps shall be at least 48 inches wide between the curbs and should be sloped at not greater than one inch of rise per twelve inches linear distance (8%). A slope no greater than one inch of rise per eight inches linear distance (12.5%) may be used where necessary. The cross slope of curb ramps shall not exceed 2%.

D. The current standards of the Americans with Disabilities Act (ADA) will govern in all cases.

2.09 TRAILS:

A. In general, trails shall be designed to the same standard as sidewalks.

B. Trails designed for public use shall be a minimum of eight feet wide, or as designated by the Engineer.

C. To the extent practicable, trails shall comply with the provisions of the Americans with Disabilities Act (ADA).

D. The trail surface shall be of one of the designs shown in Figure 2.2. Surfaces other than P.C.C. will require approval of the City Engineer. Where water is expected to overtop the trail, only non-erodible surfaces shall be used.

E. Trails designed for the use of bicycles shall be designed to the standards of the American Association of State Highway and Transportation Officials' "Guide for the Development of Bicycle Facilities."

PART 3 - DRIVEWAYS

3.01 APPROVALS AND PERMITS:

A. An access permit must be obtained before driveway construction or reconstruction work is done within the street right-of-way not associated with the construction of a new house or business for which a building permit has been obtained. However, the standards set forth in this document apply to all driveway construction. A sketch with dimensions shall be submitted showing the driveway in relation to intersections, side lot lines and other driveways.

B. A permit must be obtained from the Iowa Department of Transportation before placing a driveway within any state highway right-of-way.

C. Contractor must provide a Certificate of Insurance identifying the City as an "Additional Insured" party for the duration of the construction activity.

3.02 TRAFFIC CONTROL:

A. The contractor doing the work is responsible for all traffic control and work site safety. If construction activities extend onto the street, traffic control shall meet the standards for Work Zone Traffic Control defined in the current edition of the "Manual on Uniform Traffic Control Devices." Traffic control plans may be required.

B. The contractor shall provide adequate barricades and/or fencing to protect pedestrians continuously from the start of construction to the completion of work.

3.03 DRIVEWAY MATERIAL, THICKNESS AND FINISH:

A. The driveway slab extending from the street to private property shall be constructed of Portland cement concrete conforming to the specifications of the Iowa Department of Transportation C-3 or M-3 mixes. Maximum slump shall be 3 inches. The concrete driveway slab shall be a minimum of 6 inches thick.

B. Driveways shall have ½-inch preformed expansion joint material at the front and back of sidewalk. Driveways across from "T" intersections shall have one-inch pre-formed expansion joint material at the front and back of the sidewalk.

C. The finish shall be a broom finish or astroturf drag.

D. Apply curing compound immediately following finishing operations or cure with moist burlap for not less than 24 hours.

E. All proposed driveways must be hard surfaced from the street to the property line. Other driveway surfaces (ACC, seal coat, or special materials) may be approved, upon application to the City Engineer, contingent upon satisfactory compliance of all other requirements of this section, and any other conditions required by the City.

3.04 NEW AND REPLACEMENT CULVERTS:

A. New driveways constructed on streets without curb and gutter shall have culverts as approved by the City. Replacement of existing culverts must be approved by the City.

B. A written request for installation of a new or replacement culvert must be submitted to the City, and must be accompanied by a drawing that shows:

1. culvert dimensions, length, diameter, and culvert material

2. culvert location in relationship to property lines, street centerline and utilities

C. All culvert installation shall be reviewed and approved by the City Engineer.

D. All culverts must have a minimum diameter of 12 inches. All culverts must be constructed of either 2000D strength reinforced concrete pipe (RCP) or 10 gauge corrugated metal pipe (CMP).

E. Culverts are the responsibility of the property owner. The City accepts no responsibility for maintenance, repair, replacement, or procurement of contractors. Failure to install culvert in accordance with City requirements will result in removal and replacement at property owner's expense.

3.05 CURB REMOVAL AND JOINT AT PAVEMENT:

A. Curb drops shall be constructed as detailed in Figure 3.1.

3.06 GENERAL CONDITIONS FOR ALL CLASSIFICATIONS OF DRIVEWAYS:

A. There shall be a minimum of twenty (20) feet between the end of the radius of a street intersection and the beginning of a driveway curb cut as measured at the curb line in all instances. Additional distance between the radius of a street intersection and the beginning of a driveway curb cut may be required by the City Engineer where deemed necessary because of high traffic volumes or other safety concerns.