(A) General. Wherever pipelines designated to carry potable water supplies cross or are laid less than ten feet horizontally from existing or proposed drains or sewer lines, or cross house service sewers, storm drains, or sanitary sewers, special precautions shall be taken as follows.
(B) Parallel water mains and sewers.
(1) Should conditions prevail which prevent a lateral separation of ten feet, the pipeline may be laid closer than ten feet to a storm or sanitary sewer, provided the water main is laid in a separate trench and at such an elevation that the bottom of the water main is at least 18 inches of clear separation above the crown of the sewer.
(2) If it is impossible to obtain a horizontal separation of at least ten feet, and a vertical separation of at least 18 inches as stipulated above, the sewer shall be constructed or reconstructed of mechanical or slip-on joint ductile iron pipe, of PVC pipe equivalent to water main standards of construction, or of concrete pressure pipes specified herein, and be pressure tested to assure water tightness.
(C) Water main crossing sewers.
(1) Whenever the water main crosses over house sewers, storm drains or sanitary sewers, the water main shall be laid at such an elevation that the bottom of the water main is at least 18 inches above the top of the drain or sewer. This minimum vertical separation shall be maintained for that portion of the water main located within ten feet to be measured from the centerline of the drain or sewer normal to the water main centerline.
(2) Under conditions that the minimum vertical separation set forth in division (C)(1) above cannot be maintained or it is necessary for the water main to pass under a sewer or drain, the water main shall be protected as specified on Standard Drawings No. 21, 22, 23, and 24 of the State Standard Specifications for Water and Sewer Main Construction.
(3) Where a water main must cross under a sewer or drain, in addition to the above, a vertical separation of 18 inches between the sewer and water main shall be maintained. The sewer shall be supported to prevent its settling as directed by the Village Engineer or Superintendent of Public Works.
(D) Polyethylene encasement. Where, in the opinion of the Village Engineer the conditions warrant, a study shall be made at the expense of the owner to determine if polyethylene encasement of the ductile iron water main is advisable. The encasement shall meet the requirements of ANSI A21.5 and AWWA C104 standards.
(Ord. 07-57, passed 12-17-2007)