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4. Moisture Control <br /> 5. Cold Weather Protection <br /> B. Trenching: Excavate trenches for mechanical installations as follows: <br /> 1. Excavate trenches to the uniform width,sufficiently wide to provide ample working room and a minimum of 6 <br /> to 9 inches clearance on both sides of pipe and equipment. <br /> 2. Excavate trenches to depth indicated or required for piping to establish indicated slope and invert elevations. <br /> Beyond building perimeter,excavate trenches to an elevation below frost line. <br /> 3. Limit the length of open trench to that in which pipe can be installed,tested,and the trench backfilled within <br /> the same day. <br /> 4. Where rock is encountered, carry excavation below required elevation and backfill with a layer of crushed <br /> stone or gravel prior to installation of pipe. Provide a minimum of 6 inches of stone or gravel cushion <br /> between rock bearing surface and pipe. <br /> 5. Excavation trenches for piping and equipment with bottoms of trench to accurate elevations for support of pipe <br /> and equipment on undisturbed soil. <br /> a. For pipes 6 inches or larger in nominal size,shape bottom of trench to fit bottom%<of the circumference. <br /> Fill unevenness with tamped sand backfill. At each pipe joint over-excavate to relieve the bell or pipe <br /> joint of the pipe of loads,and to ensure continuous bearing of the pipe barrel on the bearing surface. <br /> C. Subsidence: Where subsidence occurs at mechanical installation excavations during the period 12 months after <br /> Substantial Completion, remove surface treatment (i.e., pavement, lawn, or other finish), add backfill material, <br /> compact to specified conditions, and replace surface treatment. Restore appearance, quality, and condition or <br /> surface or finish to match adjacent areas. <br /> 3.03 ERECTION OF METAL SUPPORTS AND ANCHORAGE <br /> A. Cut, fit,and place miscellaneous metal fabrications accurately in location,alignment, and elevation to support and <br /> anchor mechanical materials and equipment. <br /> B. Field Welding: Comply with AWS"Structural Welding Code." <br /> 3.04 ERECTION OF WOOD SUPPORTS AND ANCHORAGE <br /> A. Cut,fit,and place wood grounds,nailers,blocking, and anchorage accurately in location,alignment, and elevation <br /> to support and anchor mechanical materials and equipment. <br /> B. Select fastener sizes that will not penetrate members where opposite side will be exposed to view or will receive <br /> finish materials. Make tight connections between members. Install fasteners without splitting wood members. <br /> C. Attach to substrates as required to support applied loads. <br /> D. Wood shall be fire treated and pressure treated to prevent absorption of moisture. <br /> 150504 No.99132-CP2 <br />