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Section 02810 Irrigation 3.12 Sprinkler Heads: All rotor heads shall be installed on swing joints as shown on Drawings. The sprinkler head shall be installed so that the top is in accordance with the manufacturer's recommendations with respect to the finished grade level, and marked with a flag to assist in preventing damage to sprinkler heads. Backfill around swing joints and sprinklers shall be clean sand fill materials, free of large rocks, organics, or other foreign debris (see detail on the plans). 2 All sprinkler heads shall be located a minimum of 8" away from the edge of any bed line, curb, roadway, or sidewalk, and a minimum of 12" away from any building. 3 All bubblers that are shown on the plans shall be installed immediately adjacent to the ball of the tree to be irrigated. If the tree is located on a slope, the bubbler should be located at the tree ball near the high side of the slope. 4 If required, provide additional compactible soils as required to stabilize soil in area of sprinkler heads. 5 The design location of irrigation heads is approximate. The Contractor shall make minor adjustments as necessary to avoid plantings and other obstructions. Layout may be modified, if necessary to obtain coverage, to suit manufacturer's heads, and with the written approval of the Landscape Architect. Do not decrease the number of heads indicated unless otherwise acceptable to the Landscape Architect. 6 The Contractor shall add extension risers to all 12" pop-up pistons so that, while operating, the nozzle is a minimum of 3" above the top of the adjacent plant material. 3.12 Valve Boxes and Markers: All valve boxes or any other miscellaneous marker or access box shall be installed so the top of said structure is at finished grade. Valve boxes shall be installed as noted on the Drawings. All groups of valve boxes shall be installed so that the tops of all boxes are level with each other, and the sides of all boxes are parallel to each other. 3.12 Electric Control Lines: All electric control wire shall be sized as previously stated. It shall be installed in the piping trenches wherever possible and be placed under the PVC piping. Control wires shall be taped together with electrical tape not more than 5" O.C. Wire shall be snaked into the trench as loose as possible and with as much slack as possible to allow for the expansion and contraction of the wire. Provide a 10" expansion coil at 100' intervals along 02810-8 Irrigation State Road 60 and 43rd Avenue