Specifications include, but are not limited to: A. Trenching And Backfilling: 1. Pulling of pipe is not permitted for mainline. Pipe pulling for laterals shall be bid as a deductive bid alternate #1including the use of saddles for all irrigation heads. 2. Excavate trenches to specified depth. Remove rocks larger than 1-1/2 inch in any direction from bottom of trench. Separate out rocks larger than 1-1/2 inch in any direction uncovered in trenching operation from excavated material and remove from areas to receive landscaping and then remove from site at no additional cost to the Owner. All extra excavated material from irrigation installation shall be hauled off-site at no additional cost to the Owner. 3. Cover main line and lateral line pipe with rock free soil. The top 4 inches of backfill in lawn areas and top 12 inches of backfill in planter areas shall be sandy loam topsoil. 4. Do not cover pressure main, irrigation pipe, or fittings until Landscape Architect has inspected and approved system. 5. Hand trenching is required for all areas within the dripline of any tree. Do not cut any root 1-1/2” or greater. B. Sleeving: 1. Sleeve water lines and control wires under walks and paving. Extend sleeves 18 inches minimum beyond walk or pavement edge. Cover sleeve ends until pipes and wires are installed to keep sleeve clean and free of dirt and debris. 2. Position sleeves with respect to buildings and other obstructions so pipe can be easily removed. 3. Patch and repair asphalt and concrete damaged during sleeving installation and saw cutting (as noted on the plans) including excavation, backfill, compaction, road base or gravel, concrete, asphalt, cutting and/or boring, etc. Boring under concrete will be required in some areas and is acceptable to cutting out and replacing concrete. These costs shall be part of the base bid. C. Grades And Draining: 1. Winterization is required for this project. The irrigation system has been designed to be blown out with an air compressor through quick couplers); however, manual drains shall be installed at isolation/gate valve locations and other areas as directed by the Owner. Perform the following: a. Slope pipe to drain to isolation valve locations. b. At these locations install manual drain per detail and the following: 1) 1” brass ball valve (Ford Curb Stop) for manual drain. Do not use automatic drain valves. 2) Install 2 inch Class 200 PVC pipe over top of drain and cut at finish grade. 3) Provide rubber valve cap marker. 4) Provide two cubic foot pea gravel sump at outlet of each drain. c. Slope pipes under parking areas or driveways to drain outside these areas. d. Provide and install quick-coupling valves per plan for easy blowout of entire system.
