CHCID REQUIREMENTS FOR
IRRIGATION LINE AND RISER INSTALLATIONS
PER MARICOPA ASSOCIATION of GOVERNMENTS (MAG)
UNIFORM STANDARD SPECIFICATIONS for PUBLIC WORKS
CONSTRUCTION
All new irrigation main lines and new riser installations that are to be installed in the Chandler Heights Citrus Irrigation District shall conform to the MAG Specifications 757.1, 757.2, 757.2.2, 757.2.3 (B), 757.2.4 plus CHCID engineer’s directions and approval. Repair of any and all existing irrigation main lines and risers, shall be performed per CHCID requirements. All material and installation of all private irrigation main lines and risers shall be constructed in accordance with CHCID standard requirements.
1- PRIOR to STARTING any irrigation line construction, the contractor shall attend a coordination meeting with our CHCID engineer and receive a copy of these specifications plus a list of the approved pipe, fittings, valves, valve boxes, covers, and other material to be used for any project.
2-ALL MAIN LINE PIPE shall be a minimum size of 12”, schedule 40 PVC, bell & spigot glued pipe or an approved equal. Solvent cement shall comply with MAG Specifications 757.2.4. All pipe to be used for road crossings and driveways shall be a minimum of 12” C-900 PVC, class 150. All riser saddles shall be 12” X 12” PVC glued and banded using S.S. bands or 12” X 12” X 12” schedule 40 PVC tee fittings. At the end of any and all irrigation main lines, a minimum of a 2” Fresno Series 3000 Air Vent & Vacuum Relief Valve shall be installed. Required thrust blocks must be installed using a minimum concrete strength of 3000 PSI and in compliance with MAG Detail 380. All below ground valves shall be Muller Number 2360 Gate Valves. These valves are available with MJ X MJ connections or MJ X Flange connections. All bolted below ground metal valves and fittings, shall be protected from corrosion by encasement in a polyethylene protective wrapping, referred to hereafter as polywrap, per MAG Specifications 610.5 through and 601.5.3. Valve boxes and covers shall comply with MAG Detail 391-1 B with the word “WATER” molded in cover. Locking type debris caps as manufactured by SW Services, Model # R-457-B, or equal, shall be installed inside each valve box in compliance with the MAG Detail 392 and as directed by the CHCID engineer. Any pipe size smaller than 12” must be evaluated and approved by our CHCID engineer.
3- ALL PRIVATE irrigation system designs and installations must be approved by our CHCID engineer. All connections into any CHCID irrigation main line, shall be made by CHCID qualified field staff only. No contractor, home owner, or developer shall be authorized to tie any line into the CHCID main lines. Once installed, the property owner shall be responsible for the maintenance and repair of their private irrigation system. Should the property owner fail to maintain the subject system, CHCID shall make the necessary repair and add this cost to the owner’s irrigation bill, or invoice the owner direct.
4- SUBMITTALS: The contractor shall submit five copies of each submittal for each item to be used on any project in the CHCID area and receive the engineer’s approval for usage prior to purchase. Any material pre-purchased by contractor prior to CHCID submittal approval, shall be at his own risk and may be rejected by CHCID. Any rejected item shall not be used on any CHCID project. Three copies of each submittal shall be returned to the contractor as accepted or rejected with comments. Submittals shall be reviewed only two times without additional cost to the contractor. The minimum number of risers, on any one individual system, shall not be less than four 6” or one 12” riser. All systems shall be so designed that, when in operation, will support a full head (approximately 1600 GPM) of irrigation water. The irrigation water valves in each riser shall be 6” to 12” Fresno Series 2000 Clover Valves Model 20B. Each of these valves shall be secured inside the PVC riser with the bolted band designed for this purpose, and as approved by CHCID.
5- REPLACEMENT OR REPAIR OF EXISTING IRRIGATION SYSTEMS: The replacement or repair of any existing CHCID irrigation system shall be made with like kind of material or as directed and approved by the CHCID engineer. Should any part of the subject system be a private irrigation system, the owner shall be responsible for the repair or cost to make required repairs. At the owner’s discretion, CHCID may make the necessary repair to the private irrigation system and invoice the owner.
6- All trenches for main lines shall have a minimum depth of five feet and a width in accordance with Table, 601-1 of the MAG Specifications.
7- At no time shall the contractor have more than 1320 feet of open trench per MAG 601-2.10. Trenches in paved roads and main unpaved road areas are to be considered open until all ABC base material for pavement placement has been placed and compacted to 95%. Trenches in any utility easement street, road or alley right of way, outside of paved street areas are to be considered open until the backfill has been properly installed and compacted to 85 to 90% in accordance with MAG Table 601-2.
8- Prior to excavation, contractor shall call for blue-stake. After all existing underground utilities have been identified, and with CHCID’s approval, the contractor may proceed with his work and shall be responsible and liable for the cost to repair any damages to, or interruption of service, caused by his construction.
9- Pipe bedding material shall be a minimum depth of 6” and consist of clean granular material such as, sand, pea-gravel or native soil, free of broken concrete, broken asphalt pavement, wood, or other deleterious material, as approved by the CHCID engineer. The pipe zone material shall be of like kind as bedding and shall extend to 12” above the top of the pipe.
10-Trench widths shall conform to the MAG Specifications Table 601-1. All trench excavation shall comply with OSHA requirements and MAG Specifications 601.2.9. Backfill material shall be of approved material and shall be placed and compacted to 85% to 90% in 8” lifts from the pipe zone material to finished grade for unpaved areas, and to 95% to finished sub-grade for paved areas. Compaction of backfill material shall comply with MAG Specifications Table 601.2. All new irrigation main line trenches beyond 20’ from the last riser, shall be backfilled and compacted to 18” below the surface, then a continuous metallic locator tape shall be placed in the middle of the trench. Backfill and compaction shall continue from this point until trench backfill and compaction is completed
11- For all new work, the contractor shall employ and pay for the services of an Arizona State Approved Testing Lab for the purpose of testing the density of compaction of all backfill material. Compaction tests shall be performed every 100 feet of trench or as directed by the CHCID engineer and at each 2 foot lift in accordance with paragraphs 5 and 8. CHCID shall be notified when these tests are to be performed and may request to be present to witness these tests. Copies of all compaction test results shall be given or sent to CHCID. CHCID shall, if not present for any test, be notified immediately should any compaction test fail. The CHCID engineer may direct the contractor to excavate material from the failed area, down to a level that a satisfactory compaction test may be accomplished. Then fill material shall be placed and compacted in 8” lifts until a satisfactory compaction test is accomplished. For replacement of, or repair of any existing CHCID main line or riser, the contractor shall follow the directions of the CHCID engineer.
12- All installations of all underground irrigation lines shall be inspected and approved by CHCID prior to placing pipe zone and backfill material. Incompleted irrigation lines shall be plugged or capped at the end of each work shift to prevent rodents or foreign material from entering pipe lines. During construction, all pipe and fittings shall be kept clean and clear of any damage. No pipe shall be installed that shows any signs of UV or other damage.
13-Newly installed irrigation water mains shall be flushed and pressure tested in compliance with the CHCID engineer’s directions.
Primary Flushing of Irrigation Lines: New and repaired irrigation lines12” and smaller, shall be flushed for a minimum period of fifteen minutes. This shall be accomplished in the presence of a CHCID inspector, with all connections and saddles left exposed.
Pressure Testing of Main Irrigation Lines and Laterals: All new and repaired irrigation mains and laterals shall be tested to 50 feet of head or 22 PSI for two hours with all risers and clover valves installed. The minimum pressure drop during this test shall not exceed 2 PSI. CHCID shall witness all pressure tests.
14- All CHCID costs required to upgrade or improve any existing CHCID system, to facilitate service to the new irrigation system, shall be paid to CHCID by the owner prior to beginning construction.
15- During construction of any new irrigation mains or irrigation laterals, owner or contractor shall keep CHCID informed of the project progress, and request for inspections shall be made at least 24 hours prior to desired inspection time and date.
16- In the event any work associated with the installation of new irrigation mains or irrigation laterals is found NOT to be in compliance with CHCID requirements, CHCID may issue a “Stop Work Order” requiring all work to be stopped until the Noncompliant Work has been corrected to the satisfaction of CHCID.
17-Upon substantial completion (system operational) of work, a walk-through with the CHCID engineer shall be required, and any items found to need correcting, “Punch List Items” shall be corrected. Once all listed items have been corrected, a final walk-through inspection shall be made. Should there be no further infractions or non-compliance items found, CHCID shall issue a “Letter of Final Completion” to the owner or developer.
18- At the same time, the owner shall issue to CHCID, a one year unconditional warranty covering all of his new work, or a 90 day warranty for repair work, a letter or “Certificate of Ownership” of the newly constructed irrigation lines and easements, required for the operation and maintenance of the irrigation lines.
19- Should the owner or contractor need any additional information during construction, we encourage you to contact CHCID prior to proceeding with the work.