Article X Materials and Methods Construction Required Underground Improvements

Sanitary sewers and sanitary sewer service shall be installed to service all properties being developed within the municipality, including all subdivisions and developments to be annexed to the Village of Dwight after completion, and the expense of such installation and/or extension by any such person, persons, corporations, or others installing or desiring the installation of sanitary sewer extensions shall be at the expense of such person, persons, corporations, or others, and prior to such installation and/or extension, consent shall be obtained from the Village Board and in compliance with the following:

The Village must approve all plans and specifications for any extensions and new developments.

Before any extensions and new developments are installed, the plans and specifications must be reviewed and approved by the State of Illinois Environmental Protection Agency.

(c)

The ownership, right-of-way, and title to new developments and extensions after the installation of such new developments and extensions and after inspection and approval of such new developments and extensions by the Village or its agent, must be conveyed to the Village prior to or contemporaneously with the acceptance of such extensions, subdivision, or other new development. The Village will maintain the mains thereafter.

(d)

No extension or new development will be permitted if, in the opinion of the Village Board, the system does not have the necessary capacity to serve the proposed extension or new development.

Approval for construction.

All sanitary sewer systems shall be constructed in accordance with standards approved by the Environmental Protection Agency of the State of Illinois; and the Village of Dwight, or such other utility corporation, public or private, whose service may be required. All sewer designs, plans, and specifications shall be submitted to the above agencies for approval and filing.

Size and construction details. The size of the sewer to be built shall be determined by the Village Board, but in no case shall it be less than eight inches in diameter. All extensions to the public sewer shall be made with Vitrified Clay Pipe conforming to ASTM C-700 Extra Strength with ASTM C-425 joints with solvent or mechanical seal type joints or Polyvinyl Chloride (PVC) Pipe ASTM D3034, Type PSM with standard dimension ratio of 35 with solvent welded joints ASTM D2855 or flexible elastomeric seals ASTM D3212. Manholes shall be constructed at each change in direction (horizontal and/or vertical) and not more than 400 feet apart on straight sewers. Construction methods shall be in accordance with the "Standard Specifications for Water and Sewer Main Construction in Illinois" (latest edition) adopted by the Village Board and on file in the office of the superintendent. All construction shall be subject to the inspection of the superintendent or other designated representatives. All PVC pipe shall be bedded in a six-inch thick approved granular base and PVC pipe shall be backfilled with approved compacted granular material to a point eight inches above the top of the pipe. Building service shall be provided for all lots and shall be extended from the main to the street property line.

(3)

The building sewer shall be constructed of one of the following:

Cast Iron Soil Pipe ASTM A74 with rubber or neoprene joints Vitrified Clay Pipe ASTM C-700 with C-425 flexible gasket joints Polyvinyl Chloride (PVC) Pipe ASTM D3034, Type PSM with standard dimension ratio of 35 with solvent welded joints ASTM D2855 or flexible elastomeric seal ASTM D3212.

§ 250-10.02 Stormwater drainage system required.

If more than one type of sewer pipe is used, it shall be connected by tight and waterproof adapters especially designed for such joining and approved by the superintendent. All joints shall be water tight.

(c)

Size and slope of the building sewer shall be subject to the approval of the superintendent but, in no event, shall the diameter be less than six inches and slope less than 1/8 inch per foot.

(4)

Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such building drain shall be lifted by a means which is approved and discharged to the building sewer.

(5)

All excavations required for the installation of the building sewer shall be open trench work unless otherwise approved by the superintendent. All construction shall be in accordance with the Standard Specifications for Water and Sewer Main Construction in Illinois, except that no backfill shall be placed until the work has been inspected. All excavations for building sewer installation shall be adequately guarded with barricades and lights so as to protect the public from hazard. Streets, sidewalks, parkways, and other public property disturbed in the course of the work shall be restored in the manner satisfactory to the superintendent. PVC pipe shall be laid on a six-inch bed of approved granular material and shall be backfilled to a point eight inches above the top with approved granular material.

(6)

The connection of the building sewer into the public sewer shall be made at the "Y" or "T" branch, if such branch is available at a suitable location. If no properly located "Y" or "T" branch is available, the owner shall at his expense install a "Y" or "T" branch in the public sewer at the location specified by the superintendent. Special fittings may be used for the connection only when approved by the superintendent. The applicant for the building sewer permit shall notify the superintendent when the building sewer is ready for inspection and connection to the public sewer. The connection shall be made under the supervision of the superintendent or his representative.

(7)

During the time of excavation and as long as an excavated area remains open so as to act as a catch basin, any sewer tile or drainage outlet designed to service the excavated area shall at all times be either capped or furnished with a sufficient standpipe so as to eliminate the possibility of any rain or surface water collecting or draining into the excavated area and hence into the outlets and accordingly into the sewer system of the Village.

(8)

No person(s) shall make connection of roof downspouts, exterior foundation drains, areaway drains, or other sources of surface runoff or groundwater to a building sewer or building drain which, in turn, is connected directly or indirectly to a public sanitary sewer.

(9)

Foundation drains. Where foundation drains are installed to serve a building, they discharge to a sump which is equipped with a sump pump of proper size and capacity. The sump pump discharge shall terminate on the ground surface a minimum distance of 10 feet from the property line. The sump pump may be discharged to a road ditch, storm sewer, or field tile, if one is available to the property, in a manner approved by the superintendent.

Larger capacity sometimes required. Where sanitary sewer mains of larger capacity than necessary are required, as directed by the Board of Trustees to serve the subdivision as delineated in the preliminary plan, the subdivider shall be required to pay for the proportionate benefit of the installation to his subdivision, as established by the Board of Trustees.

Payment for inspection and consultation by Village consulting engineers. Whenever an inspection and/or consultation is made by the Village Consulting Engineers of plans, improvements, and/or construction for or within a subdivision prior to acceptance by the Village of Dwight of such subdivision and/or such improvements within such subdivision, and whether such inspections and/or consultations are made pursuant to a request by the subdivider, the Village of Dwight, and/or whether such inspection and/or consultation is required by an Ordinance of the Village of Dwight, and/or the Village Board of Trustees, the fees charged by the Village Consulting Engineers for any such inspection and/or consultation shall be paid by the subdivider, and such payment shall be made directly to the Village of Dwight, and shall be paid in full by the subdivider prior to acceptance of such subdivision and/or improvements therein. Fees charged by the Village Consulting Engineers shall include, but not be limited to, charges for office review of subdivision plans, field inspections, correspondence, travel time, out of pocket expenses, and all such similar charges with regard to any such subdivision.

An adequate system of stormwater drainage shall be constructed and installed, consisting of natural watercourses, storm sewers, drain tile, and other necessary facilities which will drain the subdivision, protect roadway pavements, and prevent storm/ground water discharge into the sanitary sewer system.

Storm drainage computations.

Storm sewers shall be constructed throughout the entire area contemplated for development. Such storm sewer shall be connected to adequate outfall. Intercepting stormwater structure shall be provided at intervals approximately 700 feet as measured along the center line or as determined by the kind of character and runoff as approved by the Village Engineer.

Storm sewer and sanitary sewer shall be separate and independent systems.

(3)

Storm sewer shall generally be constructed of concrete pipe with sufficient strength to develop the structural requirements necessary for the type of storm sewer to be constructed.

(4)

Storm sewer capacity shall be determined by the use of the rational formula, unless the use of another formula is approved or requested by the Village Engineer. The intensity (i) factor used shall be a return frequency of not less than 10 years, for calculating post develop runoff, and not more than one year for calculating pre develop runoff. The runoff coefficient (C) factor shall be determined by the character of the land to be drained. Stormwater detention shall be required for the calculated difference in the pre-developed and post-developed runoff volume. At the discretion of the Village, the subdivider may contribute funds equivalent to the value of the constructed detention area for the Village's use in constructing future consolidated detention areas.

(5)

All street grades, lot and block drainage shall be established so as to permit positive drainage.

(6)

Preventions of flooding. In areas where runoff from storms of greater intensity than those which the storm sewers are designed for will cause flooding of adjacent property, one of the following alternate procedures shall be instituted to preclude the possibility of flooding:

Design storm sewers to provide runoff capacity for maximum storm of record.

Change contours of land by grading to assure positive drainage.

(7)

Construction of detention ponds.

Construction of detention ponds shall be in accordance with the Village Engineer and the Village of Dwight requirements (§ 250-11.13).

A dry flow drainage shall be provided in detention areas.

(c)

Detention areas only must be capable of total drainage in not over 72 hours.

(d)

Total area of parks with detention ponds shall be not less than three acres.

(8)

Drain tiles.

Drain tile shall be constructed throughout the entire area contemplated for development. Such drain tile shall be connected to the storm sewer system or adequate stormwater outfall. The drain tile layout plan shall provide access to drain tile from all proposed lots. In general, drain tile shall be located along all rear lot lines. The drain tile shall be type N-12 non-perforated, double wall, smooth wall interior, corrugated wall exterior high-density polyethylene pipe with compatible fittings and gaskets, as manufactured by Advanced Drainage Systems, or approved equal, with a minimum nominal diameter of eight inches. All sump pumps, footing tiles, and other sources of groundwater or stormwater shall be connected to the drain tile. The drain tile system shall be designed to drain via gravity - lift stations will not be allowed.

§ 250-10.03 Manholes and drainage appurtenances.

The design standards are hereby amended by adding thereto the "standard details" as Exhibit A.

Manholes and drainage appurtenances as outlined below shall be constructed in accordance with the requirements of the Village of Dwight.

Manholes. Manholes shall be constructed of the type, style and size as set forth within the ordinances and standards of the Village.

Catch basins and inlets. Catch basins, inlets and other drainage structures shall be constructed of the type, style and size as set forth within standards of the Village.

Frames and grates. Frames, grates and covers shall be constructed of the type, style and size set forth within the ordinances and standards of the Village.

§ 250-10.04 Water supply and distribution system.

Water, supply and distribution system required. Water distribution facilities, including piping, fittings, hydrants, valves, valve basins, water services, and all other needful appurtenances adequate for fire and domestic needs, shall be installed to serve all properties within the subdivision.

Approval for construction. All water distribution systems constructed to or within a subdivision shall be constructed in accordance with standards approved by the State of Illinois Environmental Protection Agency, and the Village of Dwight water and sewer department. All distribution system plans and specifications shall be submitted to the above agencies for approval and file.

Larger capacity sometimes required. Where water mains of larger capacity are required, as directed by the Board of Trustees to serve the future growth in the vicinity of the subdivision, the subdivider shall be required to pay for the proportionate benefit of the installation to his subdivision, as established by the Board of Trustees.

Water mains.

A minimum of six inches in interior diameter or larger as the development needs dictate.

Main shall be ductile iron pipe Class 150, with a minimum depth of cover of 5 1/2 feet.

Valves and vaults. Valves shall be Mueller No. A-2370-20 Resilient Seal (or approved equal) non-rising stem valves with operating nut, designed to take full pressure on either face, manufactured in compliance with ANSI/AWWA C500 Standards. All valves shall open by turning to the left. Valves shall operate at a working pressure of 150 psi and a test pressure of 300 psi. All valves shall be installed complete with a valve box and mechanically restrained joints of a type approved by the Village's Department of Public Works. Installation of valves shall be placed outside of paved surfaces. Valves shall be located a maximum of 500 feet apart, in all zoning districts, and a maximum of 800 feet in residential districts. Valve vault, sidewall and base construction shall conform to that required for catch basins.

Hydrants.

Hydrants shall be of the comparison or gate type conforming to AWWA C502 and shall be of a make that has been adopted by the Village as standard. Hydrants shall be designed for a 300 pound test pressure and a 150 pound working pressure.