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3.02 WORKMANSHIP: <br />A. All material shall be installed in accordance with local trade practices and codes and in <br />accordance with approved design shop drawings and the manufacturer's <br />recommendations. <br />3.03 UNDERGROUND STRUCTURE: <br />A. The contractor shall contact the appropriate public utilities for location and marking of <br />those utilities. <br />B. The Owner/General Contractor shall make available to the Irrigation contractor, upon <br />written request, all available information regarding the exact location of existing <br />underground equipment including, but not limited to, owner owned security cables, <br />electrical parking lot and signage wiring, etc. <br />C. Except in the case of mismarked or unmarked buried equipment, the Contractor shall be <br />liable for the damages to and the cost of repairing or replacing any buried conduit, <br />cables or piping encountered during the installation of the work. <br />3.04 EXAMINATION: <br />A. Verify that field conditions are acceptable and are ready for work. <br />B. Verify that required utilities are installed and that adequate water pressure is available <br />and in proper location and ready for use. A minimum static water pressure of 60 psi <br />is required at the water source. <br />C. Beginning of installation means installer accepts existing conditions. <br />3.05 PREPARATION: <br />A. Layout work accurately according to the Drawing. The Drawings, though carefully <br />drawn are generally diagrammatic and head and pipe locations may need moderate <br />adjustment to complement actual field conditions. <br />B. Layout and stake location of all system components. <br />3.06. EXCAVATING AND BACKFILLING: <br />A. Excavation: Contractor shall do all necessary excavation required for the proper installation <br />of his work. Trench to accommodate proposed grade changes and slope to drain when possible. <br />B. Maintain trenches free of debris, material or obstructions that may damage pipe. <br />C. Backfill: Excavated soil may be used to backfill the remainder of the trench. All <br />Backfill material shall be free from rock, large stone or other unsuitable substances. <br />Backfilling of trenches containing plastic piping shall be done when pipe is cool to <br />avoid excessive contraction. All backfill material will be compacted in 6" layers as it is <br />brought up to finish grade as to insure that no settling results. Replace topsoil and <br />compact to consistency and level of adjacent topsoil. <br />3.07 INSTALLATION OF PIPING: <br />A. All shall be installed in accordance with the manufacturer's recommendation. <br />B. Mainline piping shall be installed with a minimum depth of cover of 18". <br />C. Lateral piping shall be installed with a minimum depth of cover of 12". <br />D. Piping shall be securely capped at the end of each day's work to prevent entrance of <br />foreign material. <br />3.08 INSTALLATION OF WIRING: <br />A. Wire shall be installed with main line piping in the same trench, but separate sleeve or conduit. At <br />each valve, or valve box location, sufficient slack of at least 18" shall be provided to facilitate future <br />service. <br />B. There shall be no splices between valve boxes. All wire splices shall be enclosed in valve <br />boxes. Splices shall be made by twisting conductors together with pliers and then securing with <br />proper sized wire nut. Wire nut shall then be inserted into splice tube filled with waterproof <br />