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I 1 I I ] J 1 J J .J J J .J ,J J J J J . pipe shall be secured in place with approved backfill material, which shall be thoroughJy compacted around the pipe, as described in Section 302.7. The joint areas shall remain exposed and precautions shall be taken to prevent the soil from entering the joint space, until the joint s~al is effected; All valve stems and hydrant barrels shall be plumb. All openings along the line of watennain shall be securely closed, as directed, and at the suspension of work at any time, suitable stoppers shall be placed to prevent earth or any , substances from entering watennain. If water is present in the trench, the seals shall remain in-place until the trench is pumped completely dry. The watermain ~hall generally be placed with 7 1/2 feet of cover. However, a slightly greater depth lI'..ay be required to clear existing storm and sanitary sewers and sewer services. Accordingly, the pipe will be laid to "the depth "substantially as shown on the plans. Minor adjustments to this may be required in the field, and no unit of measurement or payment shall apply for such variation. I I I I In certain locations where the watermain is in direct conflict with storm or sanitary sewer, the watermain shall be constfQcted under the sewer. Where it is necessary to use vertical bends to avoid sewer mains, no extra compensation will be made for this construction. However, fittings will be a unit of measurement and paYment. Watermains crossing house sewers, storm sewers, or sanitary sewers shall be laid to provide a separation of at least 18 inches between the bottom of the watermain and the top of the sewer. When local conditions prevent a vertical separation as described, the following construction shall be used: 1 (I} Sewers p~ssing over or under watermains shall be constructed of materials equal to watermairi" standards of construction. (2) Watennain passing under sewers shall, in addition, be protected by providing: (a) a vertical separation of at least 18 inches between the bottom of the sewer and the top of the watermain. Where less than 18" of separation occurs, the watermain shall be insulated as described in Section 303.900 of this specification; (b) adequate structural support for the sewers to prevent excessive deflection of joints and settling on and breaking the watermains; (c) that the length of water pipe be centered at the point of crossing so that the join~s will be equidistant and as far as' possible from the sewer. Watermains sh8iI be laid at,least 10 feet horizontally from any sanitary sewer, storm sewer or sewer manhole, whenever possible. When local conditions prevent a horizontal' separation of 10 feet, a watermain may be laid closer to a storm or sanitary sewer provided that: 300-9