(A) Utility and street improvements shall be provided in each new subdivision in accordance with the standards and requirements schedule described hereinafter.
(B) The standards and specifications for each general type of utility shall be as follows.
(1) Sanitary sewers shall be constructed in accordance with the applicable portions of the Standard Specifications for Water and Sewer Main Construction in Illinois and the applicable portions of the Standard Specifications for Road and Bridge Construction.
(2) Sanitary sewers and sanitary sewer services shall be installed to serve all properties in the subdivision. The collector sanitary sewers shall have a minimum internal diameter of eight inches. Sanitary sewer services shall have a minimum internal diameter of four inches in residential subdivisions and six inches in commercial/industrial subdivisions.
(3) Manholes for sanitary sewer shall have a maximum spacing of 300 feet and shall be constructed at all locations of alignment changes or at all sewer intersection points. Irons and lids for manholes shall be of a heavy-weight casting.
(4) All sanitary sewer trenches constructed within the street area shall be backfilled with fine aggregate (sand) and consolidated to 95% of the standard proctor density at optimum moisture. Sanitary sewer services constructed outside of the street area and within the street right-of-way shall be backfilled with approved backfill material and shall be consolidated to 95% of the standard proctor density.
(5) Storm sewers shall be constructed throughout the entire subdivision to carry off surface water from all inlets and catch basins and shall be connected to an adequate outfall sewer system. Intercepting storm sewer water structures shall be provided at points specified by the village. The stormwater drainage system shall be separate and independent of the sanitary sewer system. Storm sewers shall be constructed of reinforced concrete pipe or PVC pipe materials conforming to IDOT standard specifications. Other materials for storm sewer construction may be used in special cases upon approval of the Village Board. All existing storm drain tiles shall be connected to storm sewers or shall be restored to operating conditions.
(6) Storm sewer capacity shall be determined with the use of the rational formula. The intensity (I Factor) used shall be a rainfall frequency of not less than ten years. The runoff coefficient (C Factor) shall be determined by the character of the land to be drained and shall conform to accepted standard engineering practices. Street grades and lot and block drainage shall be established so as to assure positive drainage, as approved by the developer’s engineer.
(7) Manholes for storm sewers shall have a maximum spacing of 300 feet and shall be constructed at all locations of alignment changes or at all sewer intersection points.
(8) Frames and grates for manholes, catch basins, and inlets and valve vaults shall be of a heavy weight casting.
(C) Water mains shall be of a minimum of six-inch internal diameter and shall meet the AWWA specifications for the water main materials and mechanical joint fittings.
(1) The minimum depth of water main from the top of the pipe material to the finished grade shall be five feet. Hydrants shall be furnished with two, two-and-one-half-inch hose nozzle connections, and one, six-inch steamer nozzle connections. Threads on the nozzles, caps, and operating nuts shall be standard with the existing village hydrants. Hydrants shall have a six-inch pipe connection, a five-inch valve opening, and shall be equipped with auxiliary valves.
(2) Hydrant style and manufacturer shall be approved by the Village Water Department. Hydrants shall be installed at locations providing a maximum spacing of 300 feet.
(D) All water services shall be constructed of the Type K copper pipe, having a minimum internal diameter of three-quarters of an inch. Such services shall be equipped with an approved corporation cock, curb stops, and other necessary fittings in accordance with current village standards.
(E) All trenches caused by the construction of sewers, water mains, water service pipes, and in excavations around catch basins, manholes, inlets, and other appurtenances which occur within the limits of the existing proposed pavements, sidewalks, and curbs and gutters, shall be backfilled with trench backfill.
(1) Trench backfill shall consist of sand, pit-run gravel or crushed stone and shall be compacted in place to 95% of maximum density at optimum moisture as determined by the standard proctor test.
(2) Trench backfill may be compacted and consolidated by one, or a combination of, the following methods.
(a) Method 1. The material shall be deposited in uniform layers not exceeding twelve inches thick (loose measure), and each layer shall be compacted by ramming or tamping with tools, either by hand or mechanical.
(b) Method 2. The material shall be deposited in uniform layers not exceeding 12 inches thick (loose material), and each layer shall be either inundated or deposited in water.
(c) Method 3. The trench shall be backfilled with loose material, and settlement secured by introducing water through holes jetted into the backfill to a point approximately two feet above the top of the pipe. The holes shall be spaced no farther than six feet apart.
(3) The water shall be injected at a pressure just sufficient to sink the holes at a moderate rate of speed. The pressure shall be such that the water will not cut cavities in the backfill material nor overflow the surface. If water does overflow the surface, it shall be drained into the jetted holes by means of shallow trenches. Water shall be injected as long as it will be absorbed by the backfill material and until samples taken from test holes in the trench show satisfactory moisture content.
(F) (1) The lighting plans shall be a part of the construction plans and shall be indicated on the development plans.
(2) All work must meet the approval of the village. The village may designate larger lamps, higher poles, ornamental poles and fixtures, or vary the spacing as deemed necessary to meet any special conditions of the subdivision. Installation shall be made in conformance with the local codes, the National Electric Code, and in good and workmanlike manner.
(G) (1) All work must meet the approval of the village and be certified as being properly constructed.
(2) The developer is required to ensure compliance with all ordinances, laws, statutes, and codes applicable to the construction of utility items.
(3) It shall be the developer’s responsibility to obtain and pay for all required applications and permits for the installation of utilities.
(H) All plans and specifications for utility and street improvements shall be prepared by and certified by a state registered professional engineer.
(Ord. 889, passed 8-4-2005)