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the unsupported span is over six feet (6), in which case the existing pipe shall be supported by <br />concrete piers at no added cost to the OWNER. <br />Vitrified clay, concrete pipe, and/or gravity PVC utilities, approximately at right angles to the <br />ditch, will be removed to firm undisturbed ground on each side of the trench and the removed <br />section replaced with cast iron pipe or pressure-type PVC without additional compensation. <br />Note that for sewer lines crossing potable water mains, rnore restrictive requirements are stated <br />elsewhere herein. <br />Concrete, PVC, cast iron, steel, and clay utilities parallel to and in the edge of the trench, shall be <br />adequately supported without additional compensation. <br />Water and Sewer Utilities in Close Proximity <br />The CONTRACTOR sha11 comply with the following rules which apply to installations of potable <br />water distributian lines and wastewater collecrion lines, wastewater force mains and other <br />conveyances/appurtenances identified as potential sources of contamination. Furthermore, all <br />ratings specified shall be defined by ASTM or AWWA standards unless stated otherwise. <br />When new potable water distribution lines are constructed, they sha11 be installed no closer than <br />nine feet in all directions to wastewater collection facilities. All separation distances shall be <br />measured from the outside surface of each of the respective pieces. <br />Potable water distribution lines and wastewater collection lines or force mains that form parallel <br />utility lines shall be installed in separate trenches. <br />No physical connecrion shall be made between a drinking water supply and a sewer line. Any <br />appurtenance shall be designed and constructed so as to prevent any possibility of sewage entering <br />the drinking water system. <br />Where the nine foot separation distance cannot be achieved, the following criteria shall apply. <br />A. New Waterline Installation - Parallel Lines <br />A.1. Where a new potable waterline parallels an existing, non-pressure or pressure rated <br />wastewater line/force main or lateral and the licensed professional engineer licensed in the <br />State of Texas is able to deternune that the existing wastewater main or lateral is not leaking, <br />the new potable waterline shall be located at least two feet above the existing wastewater <br />main or lateral, measured vertically, and at least four feet away, measured horizontally, from <br />the existing wastewater main or lateral. Every effort shall be exerted not to disturb the <br />bedding and backfill of the existing wastewater line. <br />A.2. Where a new potable waterline parallels an existing pressure rated wastewater main or <br />lateral and it cannot be determined by the licensed professional engineer if the existing line <br />is leaking, the existing wastewater main or lateral sha11 be replaced with at least 150 psi <br />pressure rated pipe. The new potable waterline shall be located at least two feet above the <br />86 <br />