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installations , etc . , damaged or cut as a result of the excavations to <br /> their original conditions . <br /> 2 . Trenches shall be made wide enough to allow a minimum of 2 <br /> inches between parallel pipe lines . The minimum vertical clearance <br /> between lines crossing at angles greater than 45 degrees is 1 inch . <br /> Trenches for pipe lines shall be made of sufficient depth to provide <br /> the minimum cover from finish grade as follows : <br /> a ) 16 in . minimum cover over main lines . <br /> b ) 16 in . minimum cover over control wires . <br /> c ) 12 in . minimum cover over lateral lines to heads . <br /> 3 . Where possible , install pipe adjacent to curbs or paving to minimize <br /> interference with plants and their roots . Coordinate with landscape <br /> installer regarding proposed plant material locations . <br /> 4 . Keep trenches free of obstruction and debris that could tend to <br /> damage pipe and control wires . Remove excess soil from the site <br /> and leave grade as it was prior to sprinkler system installation . <br /> Piping shall be routed around shrubs , trees and other permanent <br /> obstacles . <br /> B . PIPELINE ASSEMBLY <br /> 1 . Install plastic pipe as recommended by the manufacturer and <br /> provide for expansion and contraction . Cut plastic pipe square . <br /> Remove burrs at cut ends prior to installation so that a smooth <br /> unobstructed flow will be obtained . <br /> 2 . Install remote control valves at locations no closer than 12 inches to <br /> walk edges , buildings and walls . Plastic pipe and fittings shall be <br /> solvent welded using solvents and methods as recommended by <br /> manufacturer of the pipe , except where screwed connections are <br /> required . Pipe and fittings shall be thoroughly cleaned of dirt , dust <br /> and moisture before applying solvent with a nonsynthetic bristle <br /> brush . Care should be taken not to use an excess amount of <br /> solvent , thereby causing a burr or obstruction to form on the inside <br /> of the pipe . Allow the joints to set at least 24 hours before applying <br /> pressure on PVC pipe . Do not use PVC cement which has begun to <br /> gel . Do not attempt to make pipe connections during inclement <br /> weather conditions . <br /> C . SPRINKLER HEADS : Large gear-driven rotary type shall be installed so <br /> that the top is slightly above finish grade . If finish grade has not been <br /> established , set the top four inches above grade and lower when finish <br /> grade has been achieved . Sprinklers on risers shall be set at elevations <br /> so that there is no interruption of the stream from the sprinkler nozzle <br /> caused by plant material during the first growing season ( 1 year from date <br /> of installation ) . Heads along curbs and walks shall be set flush to within <br /> 1 /8 inch and two to four inches away from curb or walk . Adjust heads <br /> having an adjustment stem , for the proper radius and throw for the area <br /> involved . <br /> FAEngineering\Special Projects\Enclave Subdivision\Contract Documents\Contract Documents\The Enclave.doc\00205 - Landjscape & Irrigation <br /> Specifications for Contract2.doc <br />