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, <br /> 4.3 WORKMANSHIP <br /> ' 4.3.1 General . <br /> ' , The lacation of sprinkla lines shown in the Contract Drawings is meant to be a layout schematic <br /> only. Exact locations of die lines will be determined in the field by the Owner's Representative. <br /> The Contract�shall use extreme caution when working,in the Memorial Garden Area All trees <br /> ' and plantings are very delicate in the Park and shall not be damaged. 'Il�e Contractor shall <br /> pmvide an "as-built" plan of the irrigation system at the c�npletion of the work. <br /> , The layout of the sprinkla lines are meant to work in coardination wi� the site grading and <br /> psthway plans. <br /> ' Pipelines and wire shall be buried at a depth of 12 inches minimum. Installation and working <br /> procedures for ihe sprinklers,valves,and controller shall follow manufacwrers guidelines. <br /> ' The Contractor shall remove valves,quick couplers and valve boxes from the eaisting irrigation <br /> system and cover the holes with topsoil. The valves and quick couplers will be salvaged by the <br /> ' Owner. Installation of the new irrigadon lines may require cutting of the existing urigation <br /> system lines. The new irrigation system will be connected to an existing 4-inch PVC line <br /> installed be others. A 4-inch gate valve shall be installed at this conne�don. <br /> ' The Cona�actor shall allow time after installation of the system for both calibration and <br /> adjustment of the syst�ean and training of parlc personnel in systsm operation and maintenance. <br /> ' 4.3.2 Polvvinvl Chla�ide Pive(PVC7 and Fittinas <br /> ' The installation of all piping shall be conducted in accordance wid�sound construction pracdces, <br /> ASTM D-2321,manufacdms's recommendations,and the requireme,nts of diese Spocifications. <br /> The Contrsctor shall taice adequate precautions to ensure that displaceme�t of Aoating or the pipe <br /> , or the formation of large voids under the buried pipe d�not occur: <br /> � PiP�B � � �8�ed using the vibratory plow method, where p�s�ble, to keep the <br /> , diswrbance to the area to a minimum. Minimum depth of installation for piping will be 12 <br /> inches,a�as required to install swing joints so that there will be positive drainage bacic througfi <br /> ' all joints back to the supply pipe: Concrete thrust blo¢ks will be installed at all locations where <br /> movement of pipe could cause sepazation. <br /> ' Buried pipe shall be uniformly and continuously supported its entire length on 5rm, stable, <br /> matexials suitable fa use with the pipe materiaLs �. All b�kfill maoerials shall be <br /> compacted to a minimiun 90-percent Standard Procwr Density,or as otherwise specified by the <br /> ' Owner or Owne�'s Representative. Large ar excessive numbers of small voids shall not be <br /> perniitted. � <br /> , <br /> ' TS- 3 <br /> � <br />