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Section 02810 Irrigation 3 Verify that field conditions are acceptable and are ready to receive work. Verify that utilities are available, in proper location and ready for use. Verify all existing utilities. Commencement of work means the installer accepts existing conditions. 3.02 Sleeve Installation: All PVC piping and all control lines that cross roadways or pavement more than 5' in width, shall be sleeved. All sleeves shall be schedule 40 PVC. 3.03 Excavation: The Contractor shall perform all excavation necessary to install the system indicated on Drawings, with any modifications made on site by Landscape Architect to avoid existing vegetation or accommodate transplanted material. This shall include all necessary clearing as approved by the Landscape Architect and grubbing of any foreign substance encountered in trench area. Extreme care shall be taken around existing vegetation or vegetation that has been recently transplanted. Excavation material suitable for backfill shall be piled at a sufficient distance from trench to avoid overloading, slides, and/or cave-ins. All organic or unsuitable foreign materials removed during excavation shall be disposed of off the site. Provide and install additional suitable fill materials required for back filling of excavated areas. .2 Trench bottoms shall be smooth, clean, and free of all stones, stumps and rock. If such materials are encountered in trenching, the trench shall be excavated 6 inches deeper than ordinarily required and a 6" layer of sand shall be spread to provide a firm bedding for the pipe. .3 The minimum depth of cover over main lines shall be 24". The minimum depth of cover over laterals shall be 12". .4 It is the responsibility of the Contractor to determine exact location of existing underground utilities and to avoid damage to such during construction. In event of damage to existing utilities, the Contractor shall restore same to their original condition. .5 Trenches should be excavated to a sufficient width to allow a minimum of 4" between parallel pipe lines. 3.04 Installation of Pipe and Equipment: PVC pipe shall be protected from direct sunlight while in storage. Pipe shall be kept clean and checked for presence of organic or foreign material prior to installation. Each pipe shall be laid in accordance with lines shown on the Drawings, and the pipe manufacturer's instructions. .2 Prior to backfill, PVC pipe in trench shall be protected from direct sunlight by covering with a layer of clean sandy material. Pipe shall also be covered 02810-6 Irrigation State Road 60 and 43rd Avenue