§ 158.02 Amendments To Sudas Design Material

The following amendments, modifications, additions, and deletions to the Statewide Urban Design and Specifications (SUDAS), 2025 Edition Design Manual, are hereby made:

1. Chapter 1: General Provisions.

A. 1A-1 B. Add the following statement at the end of the second paragraph: “The SUDAS Design Manual shall apply to replacement, maintenance, restoration, and rehabilitation, and new construction projects to the fullest extent feasible.”

B. 1A-1 B. Add the following statement: “Jurisdictional Engineer shall also be known as the City Engineer as appointed by the Tiffin City Council.”

C. 1A-1 B. Add the following statement: “The Jurisdiction may assign “City Staff’ to perform some or all of the duties of the inspector.”

D. 1B-1 A. Add the following paragraph: “All gravity mains shall be a minimum of eight inches in diameter. Developers will be responsible for installing pipe sizes up to 15-inches in diameter within or outside of the development. Consideration for reimbursement of the increase in material costs for mains larger than 15-inches, required for the future needs of the City, may be approved by Council Action.”

E. 1B-1 B. Add the following paragraph: “All mains shall be a minimum of eight inches in diameter. Developers will be responsible for installing pipe sizes up to 12-inches in diameter. Consideration for reimbursement of the increase in material costs for mains larger than 12-inches, required for the future needs of the City, may be approved by Council Action.”

F. 1B-1F. “Jurisdictional Permit” permit shall mean Building Permit except as required by the Iowa Department of Transportation.

G. 1B-1H. Replace the last sentence of the first paragraph with the following: Refer to City of Tiffin Ordinance 2012-313 for maintenance responsibilities.

H. 1D-1 A. 3. Add the following paragraph: “Copies of the plans submitted by the Project Engineer to the City for review by the Jurisdictional Engineer shall be full-size (24”x 36”. The minimum full-size sheet dimensions are 22”X34”. Copies of plans for bidding may be scalable half-size (11”X17”).”

I. 1E-1 B. 6. Add the following statement: “The duration of the maintenance bond is three years for all projects involving public improvements.”

J. 1F-1 A. Add the following paragraph: “As-built documentation shall be required in the form of a physical set of paper plans, PDF format, and in AutoCAD DWG format document. Drawings shall include horizontal and vertical locations of sewer services, hydrants, valves, fittings, and water services with ties to the property pins as well as any modifications to the plans made during construction.”

2. Chapter 2 Stormwater.

A. 2C-3 H. 2. Add the following section: “7. Other Jurisdictional Requirements. Castings shall be non-rocking, self-sealing, and meet SUDAS specifications. The words “STORM SEWER” shall be cast into the lid. Chimney seals are not required for storm sewer. Concrete spacers or metal shims shall be the only materials utilized to adjust frame elevations. Grout must be used to bond and seal frames to adjusting spacers. All manholes shall be marked with two metal fence posts to remain in place until landscaping is complete. In developments, the posts shall remain in place until landscaping has been completed by the lot owner.”

B. 2D-1 B. 2. Add the following subparagraphs: “d. Drainage way easements for overland flow shall be sufficient to contain the 100-year flow and as a minimum shall include the bottom width and side slopes of the drainage way and any necessary overbank areas.”

C. 2D-1 D. 4. c. Add the following statement: “Where velocities in a pipe greater than 15 feet per second are calculated, special provisions shall be made to protect against displacement, abrasion, or shock. Special provisions shall also be made for installation of energy dissipation structures downstream of any location with pipe flow velocities greater than 15 feet per second.”

D. 2D-1 D. 7. a. Add the following sub-paragraphs. “1. The maximum slope for storm sewer outlet lines shall be 10 percent.

2. If reinforced concrete pipe is utilized for outlet lines having a slope greater than or equal to eight percent, all joints must be tied together. The flared end section and the last two pipe joints shall be tied together in all instances regardless of pipe slope.”

E. 2D-1 D. 10. Add the following: “10. Permitted Flows:

a. No sanitary sewers, sanitary sewer services, or septic tanks shall be discharged into storm sewers.

b. No flows from commercial car washes shall be discharged into storm sewers.

c. Sump pump discharge of ground and surface water is permitted.

d. Only groundwater is permitted in sump pump discharge tiles less than 12-inches in diameter. No surface water or roof drains from private residences are permitted in these systems. Roof drains from commercial developments are permitted.”

F. 2D-1 D. 11. Add the Following: “11. Outlets: All pipe outlets must extend to an existing, established drainage channel. If there are no existing channels within the property being developed, the developer shall convey the stormwater through an underground piping system to the nearest established drainage channel.”

G. 2D-1 D. 12. Add the following: “12. Subsurface Drainage:

a. In predominantly wet areas, area containing hydric soils, and other such areas designated by the City Engineer, a subsurface drainage system shall be provided to receive discharge from sump pumps.

b. A two-inch service connection manufacture specifically for the pipe being used and approved by the City Engineer shall be provided for each lot abutting the subsurface drainage system.

c. The end of all sump pump services shall be marked with a metal post or number four rebar at least 24 - inches in length buried vertically to within one-foot of the finished grade.”

H. 2D-1 D. 13. Add the following “13. Other Jurisdictional Requirements:

a. No Corrugated PVC or HDPE pipe shall be installed within the public right-of-way or with easements shared with other utilities except for subsurface drainage pipes.

b. No corrugated PVC or HDPE pipe shall be used where the pipe crosses easements used by other utilities.

c. Flared end sections are required at all storm sewer outlets and shall include IDOT RF-14 ties and rip-rap or other channel protection as recommended by the City Engineer.”

I. 2G-1 F. 5. Add the following subsection: “5. Other Jurisdictional Requirements: Refer to City of Tiffin Ordinances for specific requirements.

a. Dry Hydrant Installation.

1) All wet-bottom detention facilities shall have an emergency vehicle accessible dry hydrant installed at the direction of the Fire Chief. All dry hydrants installation sites will be approved by the Fire Chief and construction drawings will be approved by the Fire Chief and City Engineer.

2) Figures G-1.02 and 2G-1.03 show typical installation details.”

3. Chapter 3 Sanitary Sewers.

A. 3C-1 C Add the following statement: “Solvent welded connections are not acceptable within the right-of-way or easements.”

B. 3C-1 G. 3. Add the following paragraphs: “Sanitary sewers crossing creeks shall be Class 350 Ductile Iron Pipe encased in reinforced concrete or three-eighths inch steel carrier pipe. Encasement shall be no less than one foot beneath the natural bottom of the creek. Greater depths may be required by the City Engineer. Rip-rap all disturbed creek banks and bottom after construction.”

C. 3C-1 L. 2. Replace paragraph with the following: “Standard Manhole: The minimum size for a manhole is 48 inches in diameter. Eccentric manholes with the manhole opening over the centerline of the pipe or on an offset not to exceed 12 inches are required. All manholes shall have built-in steps.”

D. 3C-1 L. 4. a. 4. Replace paragraph with the following: “4. at intervals not exceeding 400-feet.”

E. 3C-1 L. Add the following as Article 11. “11. Other Jurisdictional Requirements. Castings shall be non-rocking, self-sealing and meet SUDAS specifications. The words “SANITARY SEWER” shall be cast into the lid. Internal I&I barriers are required for sanitary sewer and shall span from the casting to the cone section. Concrete spacers or metal shims shall be the only materials utilized to adjust frame elevations. Grout must be used to bond and seal frames to adjusting spacers. All manholes shall be marked with two metal fence posts to remain in place until landscaping is complete. In developments, the posts shall remain in place until landscaping has been completed by the lot owner.”

F. 3C-1 M. 2. Add the following as the second sentence and Table 3C-1.04. All sanitary sewers services shall be in accordance with Table 3C-1.04. Table 3C - 1.04 Sewer Service Connections Number of Connections Type Service Requirements and Size of Service Pipe Existing service connection Single-family 1 - 4 inches of correct size or closest pipe Duplex or zero-lot Existing service connection 1 - 6 inches or 2 - 4 inches line of correct size Townhouse or 1 - 6 inches service for each Existing correct size or multiple side-by-side 2 units or 1 - 4 inches closest service connection of apartments service per unit** pipe Multi-story 1 - 6 inches service (max 6 All units must be plumbed for apartments max six units) or 1 - 4 inches service correct size or closest pipe units for each 2 units**

Table 3C - 1.04 Sewer Service Connections Number of Connections Type Service Requirements and Size of Service Pipe Existing service connection 1 - 8 inches service (max 12 Multi-story of correct size or closest pipe. units) or 1 - 6 inches service apartments seven May require larger private per 6 units or 1 - 4 inches units or more service line built to City service per 2 units** standards All units must be plumbed. Commercial or Requires City Engineer May require larger private mixed-use approval** must be sized per service line built to City development IDNR regulations standards ** Alternate service configurations with design calculations may be submitted to the City Engineer for approval.

G. 3C-1 M. 2. Add the following to the end of the second paragraph: “Internal drops for service connections may be permitted on manhole deeper than 12-feet upon approval of the City Engineer. Internal drops shall be construction SDR 23.5 PVC with stainless steel bands and fasteners spaced at a maximum of 4-feet. A minimum of two attachment point is required.”

H. 3C-1 M. Add the following as articles 6, 7, and 8. “6. Sanitary service stubs will be extended from the main to the right-of-way line or outer sewer utility easement line, whichever is further.

7. No two sanitary services shall be constructed in the same trench. Service connections shall be separated by a minimum of 6-feet.

8. The end of all sanitary service stubs shall be marked with a metal post, number four rebar at least 24-inches in length buried vertically within one-foot of the finished grade, or a painted four-inch by four-inch wood post.”

I. 3C-1 N. Add the following as Article 3: “3. Lift Stations It is the City’s intention and preference to have all extensions or additions to the sanitary sewer collection system be gravity sewer systems. If gravity sewer is not feasible, lift stations shall be designed to have regional service areas, telemetric alarm systems, provisions for the connection of standby power and auxiliary pumping.”

Table 3D - 1.01 Thickness Pipe Typical Pipe Size Standard Class Stiffness Joints application Material Range (min.) (min.) 4 inches Sanitary ASTM D Bell and PVC and 6 SDR 23.5 153 psi service 3034 Spigot inches 4 inches Sanitary ASTM D Bell and PVC and 6 SDR 26 115 psi service 3034 Spigot inches

4. Chapter 4 Watermains.

A. 4B-1 D. 2. a. Add the following statement: “The minimum size for service stubs is one-inch in diameter.”

B. 4B-1 D. 2. Add the following definitions: “d. Private Service Pipe: A water pipe installed, owned, operated, and maintained by the private consumer as further defined by current City Ordinances. Service pipes are often one-inch diameter for residential and may be two-inches to six-inches in diameter for commercial or eight-inches to 12-inches in diameter for larger industrial applications.

e. Private Fire Hydrant: A fire hydrant which is located on privately owned property, or on streets not dedicated to public use unless the watermain is within a public easement. Private fire hydrants must be served by a minimum of a six-inch diameter pipe. A private fire hydrant is the responsibility of the property owner and is to be for fire protection only. Where it is the owner intention that these hydrants be used by the City Fire Department, these hydrants shall conform to the City’s Design Standards. The City has the right to utilize the hydrants for flushing purposes.”

C. 4C-1 B. 4. Add the following sentence: “Watermains shall be constructed such that no services shall be extended beneath the paving of the circular turn-around of a cul-de-sac.”

D. 4C-1 D.1. Change the second sentence to read “300-feet” for both distances.

E. 4C-1 E. 3. B. Change the first sentence to read “300-feet” for both distances.

F. 4C-1 E. 4. Add the following paragraph: “A fire hydrant shall be required at the end of all dead-end lines. The locations of the fire hydrant may be modified at the request of the Jurisdictional Engineer or Fire Department.”

G. 4C-1 F. Add the following paragraphs and Table 4C-1.02:

“No water consumer shall construct water service pipes across lots or buildings to adjoining premises, but all service pipes shall be laid within streets, alleys, or public ground to the premises to be served and enter at the front or rear of the building nearest the main. Such service pipe shall be laid in a straight line at right angles to the watermain within two lines extended from the sides of the building to be served, or not more than three feet outside of these lines. Service pipe must be either seamless annealed copper, Type K conforming to ASTM B-88, or Polyethylene 3408 as defined in current ASTM D 2239 and AWWA C-901, Polyethylene 200 psi rated pipe. Service shut-off (curbstop) shall be located in or within one foot of the public right-of-way whenever possible. Curb tops shall not be within street, sidewalk, or driveway pavement whenever possible. Curbstops located outside of the right-of-way shall be located in an easement with ingress or egress rights for operation and maintenance of the service shut-off. Multiple stop boxes shall be permanently marked to identify the correct individual metered service.”

Table 4C - 1.02 Water Service Connections(1) Number of Connections Number of Meters and Type and Size of Service Pipe Billing Requirements 1 meter - 1 curbstop Single-family 1 - 1 inch individual billing 1 meter for each unit, 2 Duplex or zero-lot line 2 - 1 inch curbstops individual billing All units must be plumbed Townhouse or multiple 1 - 1 for each unit for individual meters and side-by-side apartments curbstops All units must be plumbed Multi-story apartments 1 -1 inch for each unit for individual meters and max 6 units curbstops Requires City Engineer All units must be plumbed approval. Must be sized for individual meters. for available main Apartments or Multi-story apartments 7 pressures and line condominiums with units or more** distances. May require specific by-laws may have larger private service built single meter and billing to City standards. Requires City Engineer All units must be plumbed approval. Must be sized for individual meter. for available main Commercial and Commercial or mixed-use pressures and line residential users must have development distances. May requires separate meters and larger private service built billing. to City standards. All services shall be designed to accommodate available pressures in existing water main, distances from the main to the user, and the City’s fire protection requirements. ** Apartment or condominiums with three habitable stories or any other structure with nine or more dwelling units is required to provide a fire protection sprinkler system. This system must be designed in accordance with the City’s Building Code requirements, and be approved by the City Engineer.

H. 4C-1 N. Add the following section: “N. Location of Easements

1. All watermains shall be located within the public right-of-way. In rare exceptions, dedicated easements may be used for location of watermain outside of the right-of-way.

2. The minimum easement width is 10-feet.”

5. Chapter 5 Roadway Design.

A. 5A-1 C. Add the following subsection: “C. Permits. State and federal permits may be required, depending on the circumstances. It shall be the responsibility of the Project

Engineer to acquire all applicable permits. A copy of the permits shall be provided to the City prior to construction.”

B. 5B-1 F. Add the following section: “F. Industrial Streets Industrial streets are intended to carry industrial traffic and service as a means of access to abutting industrial property.”

C. 5B-1 G. Add the following section: “G. Cul-de-sacs. Cul-de-sacs are placed at the end of dead-end streets to provide turn-around capabilities.”

D. 5B-1. H. Add the following paragraphs a 5B-H: 5B-1.H Alleys. “(1). Approvals and Permits.

A. Plans and specifications for public alley improvements must be reviewed and approved by the City Engineer prior to construction. B Local, State and federal permits may be required, depending on the circumstances. It shall be the responsibility of the Project Engineer to acquire all applicable permits. A copy of all permits shall be provided to the City prior to construction. (2). 2. Alley Classification.

A. A Residential Alley is a route located between local streets used primarily for access to the rear of residential property.

B. A Commercial Alley is a route located in commercial areas used primarily for access to the rear of commercial property. (3). 3. Right-Of-Way Width. The right-of-way width shall be 20 feet for all alleys. (4). 4. Pavement Width.

A. Residential alleys shall have a minimum pavement width of 16 feet.

B. Commercial alleys shall have a minimum pavement width of 20 feet. (5). 5. Alley Grades. The maximum grade for alleys shall be eight percent for residential and five percent for commercial alleys. The minimum grade shall be five tenths of a percent for all types of alleys. (6). 6. Alley Pavement Cross Section.

The pavement shall have a two percent to four percent inverted crown cross-section, or as approved by the City Engineer. (7). 7. Pavement Material and Thickness

A. The pavement slab may be constructed of the following materials:

1. Non-reinforced or reinforced Portland cement concrete conforming to the IDOT specifications C-3 mix or M-3 mix as applicable.

2. Full depth asphaltic concrete hot mix conforming to the IDOT specifications for Type “B” base and Type “A” surface course.

B. Minimum alley pavement thickness: Type Residential Commercial Portland cement 6 inches 7 inches concrete Full Depth 7 inches. 8 inches Asphalt (8). Subgrade Requirements. The subgrade shall have the same requirement as local streets. (9). Subbase Requirements. The subbase shall have the same requirement as local streets.

E. 5C-1 E. Add the following section. “E. Other Jurisdictional Requirements.

1. Minimum Criteria. In general, roadway elements shall conform to SUDAS Design Standards, however, Table 5C-1.06, Minimum Criteria for Roadway Elements, shall apply.

2. Signage. Developers shall pay the City the costs of, or install at their own cost, all initial street and traffic signal or signage for all new developments. The costs shall be determined on a unit cost per sign or signal basis for the type and number of signs or signals required as determined by the City Engineer and approved by Council action.

Table 5C - 1.06 Minimum Criteria for Roadway Elements Cul-De-Sacs

Industrial Collector Arterial

Industrial Local

Local Design Standards Design Standards

Minimum right-of-way 100 ft. 80 ft. 66 ft. 66 ft. width(3) Minimum right-of-way Minimum lane width 12 ft. 12 ft. 12 ft. 12 ft. 67.5 ft. 75.0 ft. radius Auxiliary lane 12 ft. 12 ft. n/a n/a Minimum pavement Minimum bulb paving 36 ft. 36 ft. 31 ft. 34 ft. 50 ft. 59 ft. width(1)(4) radius Maximum grade 8% 10% 10% 8% Maximum grade 8% 8% Minimum grade 0.5% 0.5% 0.5% 0.5% Minimum grade 0.70% 0.70% Minimum pavement 1,000 150 Minimum stem to bulb 350 ft. 150 ft. 50 ft. 75 ft. curve radius(5) ft. ft. transition radius

4 ft. 4ft. paved paved Median width(7) 16 ft. 9 ft. 9 ft. grassed grassed Minimum pavement Minimum pavement 9 in. 8 in. 7 in. 8 in. 7 in. 8 in. thickness (P.C.C.)(2)(6) thickness (P.C.C.)(2) Minimum pavement Minimum pavement (2)(6) 10 in. 9 in. 8 in. 9 in. 8 in. 9 in. thickness (A.C.C.) thickness (A.C.C.)(2) Including curb and gutter May have additional granular subgrade requirements depending on existing soils and anticipated traffic conditions Additional width is required for medians or boulevards if they are planned within the right-of-way. This additional right-of-way shall be dedicated to the City by the Developer. A larger pavement width may be specified for roadways defined as Prescribed Roadways in the City Access Regulation Ordinance. Under no circumstances will variances be granted for radii less than 75 feet. Pavement thickness and subgrade requirements are intended as a guide. Street projects shall be designed on the basis of soil conditions and the projected traffic loadings. Medians or boulevards which are included as a part of local or collector streets shall have a minimum width of four feet if paved of nine feet if grassed. Paved medians on local and collector streets are discouraged, unless desired by the City at intersections. Raised medians are not allowed.

F. 5C-2 K. Add the following paragraph: “Variances to clear zone requirements will be considered for overhead electric facilities where compliance will significantly impact existing trees. In no case will a clear zone of less than 18-inches be allowed. A clear zone variance must be approved by the City

Engineer. Every effort shall be made to eliminate sight obstructions within the right of way.”

G. 5C-2 M. Add the following as the third sentence in the first paragraph: “A slope of one quarter inch per foot or two percent is preferable within the City of Tiffin especially near intersections to better manage ADA compliance.”

H. 5C-2 M. Add the following paragraphs: “1. In residential areas, the parkway shall be grassed except in such areas that the parkway is so narrow that grass does not grow well. In these narrow areas, the alternate materials described in Paragraph 2 may be used upon approval of the City Engineer. In commercial areas, alternate materials shall be used in the parkway upon approval of the City Engineer. These materials include exposed aggregate, concrete, asphalt, and bricks, or concrete pavers on an asphalt or concrete base.”

I. 5L-3 C. 3. Add the following paragraphs: “Access spacing shall be regulated by the City of Tiffin in the following manner.

A. Minor Arterial Roadways. The minimum distance between the centerlines of roadway access points shall be 300-feet. Driveways to individual lots abutting arterial roadways are prohibited unless the driveway provides access to or from a commercial or multi-family residential area with 18 or more dwelling units. A driveway access to these areas must be warranted by a traffic study and have concurrence by the Jurisdictional Engineer.

B. Collector Roadway. The minimum distance between centerlines of roadway access points shall be 125-feet. A single driveway access will be allowed for each lot abutting a collector roadway. In the case of a corner lot, the driveway access must be to or from the street with the lower classification. One additional driveway access may be permitted if all of the following criteria are met.

1. The frontage length is greater than 150-feet.

2. The additional driveway is warranted by a traffic study.

3. Concurrence by the Jurisdictional Engineer. Driveway access points should be coordinated to minimize turning conflicts.”

J. 5L-4 A Add the following paragraphs to 5L-4 A: “All entrances in urban settings should be paved to prevent aggregate from washing onto the pavement, curb, and gutters. If the existing drive is not paved, pave the first 10 feet from the back of curb or to the edge of the existing sidewalk.

All entrances should be constructed so as not to impair drainage within the highway right-of-way nor alter the stability of the highway subgrade and at the same time not impair or materially alter drainage of the adjacent areas. All culverts, catch basins, drainage channels, and other drainage structures required under driveways as the result of property being developed should be installed in accordance with current standards and specifications.”

K. 5L-4.H. Add the following paragraphs as 5L-4.H: “5L-4.H. Other Jurisdictional Requirements.

1. 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 or modifying 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.

2. 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 right-of-way, 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 or fencing to protect pedestrians continuously from the start of construction to the completion of work.

3. Driveway Material, Thickness and Finish.

A. In Residential Zoning 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. The concrete driveway slab shall be a minimum of 6-inches thick.

B. All proposed Commercial or Industrial 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.

4. 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.

3. All culvert installations shall be reviewed and approved by the City Engineer.

4. 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).

5. Down-stream conditions of the proposed culvert.

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

5. Curb Removal and Joint at Pavement. Curb drops shall be constructed as detailed in Figure 7030.102 of SUDAS Standard Specifications.

6. General Conditions for All Classifications of Driveways. The maximum driveway widths are listed in Table 5L-4.07. On lots with multiple frontages the major driveway shall be on the lower classified street. Some subdivisions may prohibit access onto the higher classification street. Check the subdivider’s agreement and the City of Tiffin Access Regulation Ordinance in each case. The following minimum driveway separations will also apply.

A. There shall be a minimum of 20 feet between the end of a 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.

B. A six foot minimum distance between curb cuts of adjacent entrances at the curb line will be required.

C. The curb return shall not be constructed closer than three feet to the side property line extended.”

Table 5L - 4.07 Maximum Driveway Widths(6) Zoning Number Frontage Driveway Width Lanes and Medians District Allowed At At Out Out Median Type In (2) Sidewalk Curb Left Right Single-Single 24 ft. 30 ft. 1 family Single 12 ft. 18 ft. 2 max Shared 30 ft. 36 ft. 1 Double(1) 24 ft. 30 ft. 1 And 12 ft. 18 ft. 1 Two-Separate 24 ft. 30 ft. 1/unit family Common 30 ft. 36 ft. 1 All other Single 34 ft. 42 ft. 1/lot residential 2/lot Single 24 ft. 32 ft. max >150 ft. 34 ft. 42 ft. 2/lot double 34 ft. 42 ft. 3 max Non-Driveway residential And Type(4) industrial (Shared (3) 16 “A” 45 ft. 1 12 ft 12 ft. 4 ft. driveway) ft. (Shared (3) 16 “B” 41 ft. 1 12 ft. 12 ft. driveway) ft. Single (3) 1 - 14 ft. lane “C” 28 ft. 1 14 driveway out

State (5) highway For corner lot, major driveway is required to be on the lower classified roadway. Median may be painted or raised with curb. Special design, radius returns may be required. Driveway type generally follows IDOT Iowa Primary Highway Access Management Policy. Entrance design governed by IDOT Iowa Primary Highway Access Management Policy. Distances may be varied by the City Engineer in certain instances in the existing developed areas of the City, as necessary.

6. Chapter 6 Geotechnic.

A. 6E-1 G. Add the following subsection: “J. Other Jurisdictional Requirements. All roadways, streets, alleys shall be designed with engineered subgrade. As a minimum, the top six inches of the subgrade shall be scarified and re-compacted to 95 percent standard proctor density. Additional compaction may be required based on soil conditions and expected traffic volumes. Soil amendment or below grade core out may also be required.”

B. 6F-1 J. Add the following subsection: “J. Other Jurisdictional Requirements. All paved roadways, streets, alleys and driveways shall be designed with either Granular Subbase (IDOT Gradations 12) or Modified Subbase (IDOT Gradation 14) with a minimum thickness of six-inches. Additional thickness may be required based on soil conditions and expected traffic volumes.”

C. 6G-1 H. Add the following subsection: “H. Other Jurisdictional Requirements. All roadways, streets, and alleys shall be designed with subsurface drainage systems.”

7. Chapter 7 Erosion and Sediment Control . No amendments.

8. Chapter 8 Parking Lots.

A. 8B-1 E. Add the following sentence to the last paragraph: “All new parking lot construction shall be designed such that all storm water flows are directed away from adjacent building foundations.”

B. 8C-1 G. Add the following subsection: “G. Other Jurisdictional Requirements. The installation of all parking shall comply with the standards described herein as well as the requirements of the Zoning Ordinance. All required parking shall be provided on private property. On-street parking may not be counted for meeting the parking requirements listed in the Zoning Ordinance. These standards are intended to serve as a supplement to the regulations located in the City of Tiffin Zoning Ordinance. The Zoning Ordinance regulations include, but are not limited to, provisions for: the required number of parking spaces for a particular use, the parking of recreational vehicles, and the use of off-street parking. The City of Tiffin Zoning Ordinance should be consulted in conjunction with these Design Standards.

1. Required Landscaping for Off-Street Parking. All off-street parking areas for multiple-unit residential and commercial projects shall receive landscaping, both around their perimeter and within the interior of the parking lot, according to the following standards.”

2. Landscaping Requirements. “All required front setback areas shall be landscaped except for driveways. All parking spaces and back-up areas, except for driveway parking for single-family dwellings, shall be located behind the required front yard setback. All parking areas shall provide a minimum five-foot landscape planting area around the perimeter of the parking, except for driveway access. Landscape planting areas shall be widened to accommodate vehicle overhand, resulting in eight feet zero inches width adjacent to standard spaces. Only low level shrubs and groundcover shall be used in vehicle overhang areas. Perimeter landscaping shall be used to screen the parking lot from the public view by the use of shrubs or decorative mounding to an effective height of three and one-half feet and shall utilize street trees at the ratio of 1 tree per 40 feet of street frontage. All interior landscaping planting areas shall provide trees selected to provide shade canopies with a minimum diameter of ten feet at maturity. The amount of required interior parking lot landscaping may be reduced by the Planning and Zoning Commission when the following findings are made:

a. It effectively mitigates the visual impact of a broad expanse of pavement through careful placement of trees and other vertical elements such as vines and landscaped banks.

b. It helps promote safe traffic circulation.

c. It is provided in an area large enough to ensure its survival. All landscaping (perimeter and interior) shall be separated from the parking pavement by a continuous six-inch Portland cement concrete curb.”

3. Security Lighting. “Lighting shall be provided in all parking areas to provide an adequate level of security. All lighting shall be screened so that it does not illuminate adjacent properties. In general, light bulbs should not be directly visible from any adjoining residential property.”

9. Chapter 9 Utilities.

A. 9D-1 C. Add the following as paragraph 7. “7. The easement area adjacent to the right-of-way shall be graded uniformly and have a cross slope be between plus five percent and minus five percent.”

B. 9D-1 E. Add the following subsection E: “E. Other Jurisdictional Requirements.

1. Work Around Trees.

a. Use care to prevent work within the drip line of trees.

b. When work falls within the drip line of trees, contact the City Hall.

2. Restoration of Pavement Surface. Follow SUDAS Section 7040.

3. Other Surfaces. All areas outside the pavement which are disturbed shall be restored to their original condition. When approved by the governing authority, unimproved streets (rock or rock and oil, seal coated streets) may be repaired or restored with bituminous seal coat consisting of one or more applications of binder bitumen with one or more successive applications of cover aggregate. materials, equipment and construction methods shall be in general conformity with Section 2307 of the current Iowa Department of Transportation Standard Specifications for Highway and Bridge Construction.”

10. Chapter 10 Street Tree Criteria. No amendments.

11. Chapter 11 Street Lighting.

A. 11C-1 D. Add the following subsection D: “D. Other Jurisdictional Requirements.

1. Light Fixture Spacing. At a minimum, light fixtures shall be placed at intersection and at mid-block. Additional fixtures are required at intervals that allow for continuous lighting along the sidewalks of the block.” Contact City Hall for a list of approved lighting fixtures.”

12. Chapter 12 Sidewalks and Bicycle Facilities.

A. 12A-1 E. Add the following subsection F: “F. Other Jurisdictional Requirements.”

1. Width and Location.

a. Sidewalk and trail widths shall be a function of Street Classification (see Section 5 for definitions of road designations), expected use, and zoning.

b. Sidewalks in the public right-of-way shall be located one-foot from the property line, except in areas in which a different offset is required to match existing walks or where topographical constraints exist.

c. Sidewalks that extend to the street perpendicular to the curb shall only be located at intersections, cluster mailbox locations, and designated mid-block crossings. Such perpendicular sidewalks in other locations removed for construction or maintenance activities shall not be replaced.

d. Sidewalks are required on both sides of all streets, except in Industrial Zoning.”

2. Matching Existing Walks. “a. The width and location of a new sidewalk shall match the width and location of existing sidewalks in the area. However, the sidewalk width shall not be less than five feet (no tapers allowed).

b. Sidewalk cross slopes may be varied through a gradual transition to match existing adjoining walks. Accessible sidewalk design is still required, Contact City Hall if existing adjoining walks vary significantly from existing standards.”

13. Chapter 13 Traffic Signals. No amendments.

14. Chapter 14 Trenchless Construction. No amendments.

15. Chapter 15 Fencing. Add the following as Chapter 15 Fencing:

A. “15A-1 A. Fencing Requirements

1. At the time of approval of the final plat, the Subdivider of any subdivision which has a boundary abutting land used for agricultural purposes shall agree to be responsible for the construction and maintenance of all fences between the subdivision and all land used for agricultural purposes. A required fence shall consist of either:

a. Not less than 26 inches of substantial woven wire on the bottom with three strands of barbed wire with not less than 36 barbs of at least two points to the rod on top; the top wire to be not less than 48 inches, nor more than 54 inches high; or

b. Good substantial woven wire of not less than 48 inches nor more than 54 inches high, with one barbed wire of not less than 36 barbs of two points to the rod, nor more than four inches above said woven wire. These fence construction standards shall be considered the minimum standard to be required by agreements pursuant to this article.

2. The Subdivider shall satisfy the following conditions regarding fences:

a. At the time of submittal of the final plat, the subdivider shall submit a Subdivider’s Agreement with the City that sets forth provisions for fence agreements with the owners of property adjoining the land included in the final plat. The fence agreement will specify the responsible party of fence construction and maintenance.

b. Required fence agreements shall at a minimum, contain the following: (1). A statement that the agreement shall be binding on both parties, their heirs, and assigns. (2). A statement that the agreement shall run with the land. (3). A termination clause effective upon the subdivision of the adjoining property for non-agricultural purposes.

3. Prior to approval of the final plat, the subdivider shall submit copies of the recorded fence agreements with the owners of property adjoining the final plat. Where the owner of property adjoining the plat shall fail to enter into said fence agreement the City of Tiffin may nevertheless approve the final plat after the following condition has been satisfied:

a. The Subdivider’s Agreement with the City states that the Subdivider is the sole responsible party for fence construction and maintenance for all fences abutting land used for agricultural purposes.”