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§ 152.069 MINIMUM PAVEMENT WIDTHS AND SURFACE TYPES.
   The following requirements are applicable to all subdivisions within the jurisdiction of the Planning and Zoning Commission.
   (A)   Pavement widths for arterial and collector streets will be designated by the City Council. Where required to be provided as part of the subdivision, the subdivider will be responsible for 37 feet. The difference, if any, between the cost of the portion to be provided at the expense of the subdivider including the cost of curb and gutter, if any, and that of the total width designated by the City Council shall be borne by the city, the county or by the state’s Department of Transportation where applicable, unless it is determined by the Council that the greater width will benefit the subdivider in proportion to its cost.
   (B)   Local streets and dead end streets shall have minimum widths of 37 feet. Where curb and gutter is required the total width, back-to-back of curb shall be 37 feet. The pavement of a turning circle at the end of a dead end street shall have a minimum paved outside diameter of 53 feet to back of curb.
   (C)   Alleys shall have minimum paved widths of 16 feet.
   (D)   Alleys, where permitted, will be constructed with a concrete pavement of a minimum thickness of six inches or of asphaltic concrete of a minimum thickness of four inches mat and ten inches base. This requirement may be varied by the Council if, in their opinion, the requirement imposes too severe a restriction when related to the projected use of the alley.
   (E)   The subdivider shall grade all streets from property line to property line prior to installation of water and sewer facilities. Centerline street grades are to be established by the subdivider subject to approval of the City Engineer.
   (F)   The subdivider shall, after grading streets and after sanitary sewer, storm sewer and watermains are in, construct a minimum of six-inch compacted gravel street 37 feet in width. The grading and graveling of the street includes installation of culverts necessary for over the ground drainage until curb and gutter is installed.
   (G)   Streets shall be graded full width and fully constructed with a concrete pavement of a minimum thickness of six inches or of asphaltic concrete of a minimum thickness of four inches mat and ten inches base or of a construction standard and material approved by the City Engineer, in writing. If the classification of the street justifies the construction of a thicker section, the additional cost thereof shall be borne by the city, the county or the state’s Department of Transportation depending upon the agency having jurisdiction.
   (H)   The subdivider shall within one year provide for the construction of curb and gutter within the confines of the platted area; provided, however, the Council may extend this period where unusual drainage problems exist and the drainage cannot be installed prior to or with the curb and gutter construction, as outlined in a subdivision agreement.
   (I)   The subdivider shall within two years provide for the construction of the street surface within the confines of the platted area, provided, however, the Council may extend this period, as outlined in the subdivision agreement.
(Ord. 232, passed 11-1-2000)
§ 152.070 STREET GRADE, CURVES AND SITE DISTANCES.
   The following requirements are applicable to all subdivisions within the city.
   (A)   The grades of any street or alley shall not be less than 0.4%. Where specifically approved by the City Engineer, alleys may be designed with a twenty-five-one-hundredths grade when constructed with concrete pavement.
   (B)   The grades in all streets, arterial highways, collector streets, minor streets and alleys in any subdivision shall not be greater than the maximum grades for each classification as follows:
 
Principal arterial highway
6%
Minor arterial highway
6%
Collector street
6%
Local street
8%
Alley
8%
Pedestrian way
20% (may be increased if steps of an acceptable design are provided)
 
   (C)   All changes in street grade of 1% or more shall be connected by vertical curves. The length of the vertical curve will be determined on the basis of providing stop sign distances for each road classification where design speed for arterial and collector streets is 40 mph and local streets is 25 mph. In no case shall the length required vertical curve be less than 15 times the algebraic difference in rate of grades for arterial and collector streets or one-half of this minimum for all other streets.
   (D)   The radius of curvature on the center line of the street shall not be less than that required to produce stop sign distance as defined in division (C) of this section. In no case, however, shall the radius or curvature for arterial and collector streets be less than 300 feet or for local streets, service drives and alleys be less than 100 feet.
(Ord. 232, passed 11-1-2000)
§ 152.071 INTERSECTIONS.
   The following requirements are applicable to all subdivisions within the city.
   (A)   At a street intersection, the street curb intersection shall be rounded by a radius of at least 15 feet.
   (B)   Where, in the opinion of the Engineer, the center line profiles of streets presented as part of the preliminary plat do not clearly indicate that adequate intersection design will be accomplished, the Planning and Zoning Commission may request an intersection detail at a scale not to exceed one inch equals 20 feet, which detail will clearly represent the construction details for the intersection.
   (C)   Intersections shall be designed so as to avoid abrupt changes in longitudinal or transverse slope.
(Ord. 232, passed 11-1-2000)
§ 152.072 LOTS.
   The following requirements are applicable to all subdivisions within the city.
   (A)   The size, shape and orientation of lots shall be appropriate for the location of the proposed subdivision and for the type of development contemplated. Lot dimensions shall conform to the requirements of the Zoning Code.
   (B)   Excessive depth in relation to widths shall be avoided. A proportion of not more than three to one normally shall be considered appropriate.
   (C)   Every lot shall abut on a street. Lots for residential purposes shall meet the size requirements of the Zoning Code, and also the requirements relative to building setback and side yard requirements.
   (D)   Residential lots fronting on arterial and collector streets should have extra depths to permit deep setbacks for the buildings.
   (E)   Double frontage lots and reversed frontage lots shall not be platted except as herein before permitted under § 152.067.
   (F)   Side lot lines shall be approximately at right angles to the right-of-way line of the street on which the lot fronts.
   (G)   Narrow, triangular lots, unusual shapes, and lots not permitting at least a 26-foot width house with side yards and driveway, rear yards and front yards are prohibited. No plat will be accepted that contains lots undesirable for building, property subject to recurrent flooding, property at grades greater than 8% or other factors that may cause the properties to be marginal in building operations and cause the property to be returned for property taxes.
(Ord. 232, passed 11-1-2000)
§ 152.073 UTILITIES AND DRAINAGE.
   The following requirements are applicable to all subdivisions within the city.
   (A)   Water lines. Where an approved public water supply is within reasonable access to the subdivision as determined by the number of lots, distance from and capacity of existing mains, water lines shall be placed within the right-of-way of each street. Water lines shall have a minimum diameter of six inches. Fire hydrants shall be installed at intervals of not less than 400 feet. The minimum size water main shall be six inches in diameter and all water mains shall be looped so that water is available from two directions to any point. Water mains, fire hydrants, gate valves and appurtenances shall be installed in accordance with acceptable engineering practice. Each lot shall be provided with a connection to the watermain. In general, in new residential areas, water main services with a shutoff shall be installed to appropriate public recreational areas with the water main construction.
   (B)   Sanitary sewers. Sanitary sewers shall be constructed in accordance with a connection to a sanitary sewer. The city may accept an area for platting where the service cannot be provided when the lots are of sufficient size and soil is suitable for private systems in accordance with city and state Health Department recommendations. No private disposal systems shall be interconnected or run to a common private or public drain. The minimum size public sanitary sewer shall be eight inches in diameter. In general in new residential areas sanitary sewer services shall be installed to appropriate public recreational areas with the sewer construction. Sewage lift stations will be constructed if necessary to serve an area, provided a lift station will be constructed on an assessment basis. The lift station cost beyond the area immediately assessable will be held for future assessment to the future area to be served.
   (C)   Storm drainage. All necessary facilities including underground pipe, manholes, inlets, catch basins and other appurtenances necessary to provide adequate drainage for the property or to maintain any natural drainage course shall be the responsibility of the developer. Open drainage ditches will not be allowed unless specifically directed by the City Engineer. Platting of property is prohibited unless it is possible to drain the property by gravity drainage to the natural drainage course for the area. At a minimum no property plat will be accepted unless street grades are at least five feet above lake elevation so as to drain into the streets. The meeting of this requirement does not obligate the Council to accept the plat if there are substantial obstructions to the drainage of the property contained therein and the Council may require that the subdivider install pumping facilities for storm drainage prior to plat acceptance if the facilities are necessary. Storm drainage and retention ponds shall be required and designed in accordance with state statutes.
   (D)   Extensions not in platted area. In some cases, the proposed area to be platted will not be served at its borders by water mains or sanitary sewer. The Council may require a petition for the creation of an assessment district to extend the facilities to the platted area; or may require the subdivider to pay the cost of the extension; or may accept the plat with a separate water or sewer system; or may pay the cost thereof and hold the amount for future assessment; or may refuse acceptance of the plat.
   (E)   Building permit. No building permit shall be issued in the platted area until sewer and water mains are designed, approved and the contract for installation awarded with a satisfactory completion date. No building shall be occupied in the platted area until provided with sanitary sewer and water service and until the street is graveled and the graveling accepted as adequate by the City Engineer to serve the building. The occupancy of a building in violation of this division shall not relieve the subdivider of any responsibility for street improvement. The transfer of property in the plat from the original subdivider to other parties shall not relieve the subdivider of his or her responsibility for initial street work as defined herein.
   (F)   Design of improvements. The City Engineer will design only the improvements to be installed by the city. A subdivider desiring to contract and install their own improvements shall have plans and specifications prepared by a state-registered engineer, which have been approved by the City Engineer and state agencies before constructing begins. All street, sanitary sewer, storm sewer and watermain improvements installed by the subdivider shall be inspected by the City Engineer and the Engineer shall furnish a written statement to the subdivider of city acceptance of the utility improvements or street as part of the city system. Any corrections to the improvements found necessary by the City Engineer shall be done by and at the expense of the subdivider before the acceptance is made.
(Ord. 232, passed 11-1-2000)
§ 152.074 OTHER REQUIREMENTS.
   The following requirements are applicable to all subdivisions within the jurisdiction of the city.
   (A)   Sidewalks. Sidewalks at least five feet wide, constructed of concrete pavement with a minimum thickness of four inches shall be constructed on both sides of every street where the average width of lots is less than 60 feet. Sidewalks shall be constructed on one or both sides of collector and arterial streets irrespective of the width of lots where, in the opinion of the Planning and Zoning Commission, these are necessary to protect the safety of pedestrians.
   (B)   Driveways. The subdivider shall install driveways, driveway approaches and curb returns for each connection to the street.
   (C)   Screen planting. The installation of trees and shrubs to form a tight screen effective at all times shall be required along the rear line of any lot in the subdivision which backs onto an arterial or collector street.
   (D)   Street names. All streets are to be named. A proposed street which is in alignment with and which joins an existing and named street shall be given the name of the existing street. The name of a proposed street shall not duplicate the name of an existing street to which it does not connect or with which it is not in alignment.
   (E)   Street name signs. Reflectorized street name signs shall be provided at all street intersections or where a change of direction of a street requires a change of street name. The signs shall be of the size and type approved for use by the city. Normally, one sign will be required at each residential intersection; however, more may be required dependent upon the character and/or width of the streets.
   (F)   Tree removal and conservation of vegetation.
      (1)   Existing and healthy trees and native vegetation shall be preserved to the maximum extent feasible and shall be protected by adequate means during construction.
      (2)   Unless already on site, at least one suitable tree shall be planted in the front yard setback on every lot. The type or species of trees planted shall be approved by the city.
      (3)   Consistent with approved grading plans; existing trees shall be preserved within any right-of-way when they are suitably located and in good health.
      (4)   No dead trees or uprooted stumps shall remain after development.
      (5)   All disturbed areas shall be seeded or sodded to prevent erosion.
      (6)   Detailed landscaping requirements shall be set forth in a development contract.
(Ord. 232, passed 11-1-2000)
§ 152.075 SUBDIVISION AGREEMENTS.
   An agreement shall be executed by the subdivider and the city before any plat is executed by the city. The agreement shall be recorded by the subdivider in the office of the County Recorder within 30 days of final approval.
(Ord. 232, passed 11-1-2000)
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