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6. <br />All casing pipe installations where the diameter is <br />greater than 4:8 inches will require a preconstruction <br />conference at the project site. <br />7. <br />PreacnatriOction arrangements will be made with the <br />offUd, -Chief Engineer at least one week prior to <br />construction. A Railway inspector must be present <br />during the entire construction of the casing pipe. - <br />The- inspector will 'have complete authority <br />hority 6ver the <br />project on the Railway's right of way. <br />8. <br />All costs to provide inspection will be borne by the <br />lessee. <br />D. Tunnel liner eaquitement s are as follows: <br />I <br />All, appli; I Mble. preceding sections will govern tunnel <br />liner usage proposals_ <br />2. <br />Tunnel linerVlaitok will be 12 Pi, galvanized, and all <br />bolts and nuts will be galvanized. <br />3. <br />Live load will be based on X-80.Railway Loading using <br />ga pliicabtld formulae and computations performed by a <br />g stered. <br />e� professionalengineer. The computation <br />results Will accompany the plans for review by' the <br />dffice; of the Chief Engineer. <br />4. <br />Gtout holes will be provided at 10 foot intervals along <br />the roof and Sides.. <br />5. <br />The tunnel liner Jacking shield will protect 180 degrees <br />of the upper section and material removed to allow' for <br />minimum ,4444i 1';:I- Slope witha minimum 2.0 feet of <br />undisturbed soil supporting the overburden. <br />6. <br />The tunnel line installation will progress with <br />sufficient manpower and supervision f ir around the <br />' <br />clock conattuon until - <br />cti the liner it completed. <br />E. Carrier PiPOline: specifications are as tollowSm. <br />.1. <br />Reinforced Conprets pipe <br />a. Materials: Modified boll and spigot or tongue <br />and gtoove in accordance with current ASTM <br />Specification C76 Class. V for Rativiy' <br />strength . Pip* or current specificiation for <br />Pre4tiessed concrete <br />