8 CCR 1206-4 Part 6 - Equipment, Standards and Installation

6.1. Any irrigation distribution system through which chemigation is performed, except open discharge systems, shall be equipped with the mechanical devices specified below. The equipment shall be permanently installed in accordance with the manufacturer's specifications and at the location specified therein.

6.2. Irrigation pipe check valve

6.2.1. The irrigation pipeline check valve shall be located in the pipeline between the irrigation pump and the point of chemical injection into the irrigation pipeline. Its purpose is to prevent reverse flow, which is a mixture of water and chemical draining or siphoning back into the irrigation water source.

6.2.2. Irrigation systems which, as of July 1, 1989, were equipped with a properly located irrigation pipeline check valve shall be considered in compliance with these Rules if the valve provides a seal against reverse flow.

6.3. Vacuum relief valve

6.3.1. The vacuum relief valve shall be located on the pipeline between the irrigation pump and the irrigation pipeline check valve. Its purpose is to prevent creation of a vacuum in the pipeline and possible reverse flow into the water source when the pump stops.

6.3.2. The vacuum relief valve shall be sized in accordance with the manufacturer's specifications.

6.3.3. If the vacuum relief valve connection will also serve as the inspection port, the permit holder will ensure removal of the valve at the time of inspection. The inspection port shall be located on the pipeline between the irrigation pump and the irrigation pipeline check valve. The inspection port shall be situated in such a manner that the inlet to the low pressure drain can be observed. A minimum four-inch or larger diameter port is required. If a chemigation system has a vacuum relief valve of a minimum two inch diameter, which was in place as of the effective date of these Rules, and the irrigator will ensure its removal at the time of each inspection, such valve may be used as the inspection port.

6.4. Drain

6.4.1. An automatic low-pressure drain shall be located so as to drain any water-chemical mixture which may enter the pipeline between the irrigation pump and the irrigation pipeline check valves by reverse flow when the pump stops. When the pipeline water flow stops, the drain valve shall automatically open. A tube, pipe or other conduit shall be used to discharge the solution at least twenty feet downslope from the irrigation water source or otherwise prevent it from collecting on the ground surface around the well casing.

6.4.2. The drain valve shall be constructed of corrosion resistant material or otherwise coated or protected to prevent corrosion.

6.4.3. The drain shall have an orifice of at least three-quarter inch diameter.

6.5. Chemical injection line check valve

6.5.1. The chemical injection line check valve shall be located at the point of chemical injection into the irrigation pipeline. Its purpose is to prevent flow of water from the irrigation system into the chemical supply tank and to prevent gravity flow from the chemical supply tank into the irrigation pipeline. The valve shall be constructed of chemically resistant materials. The valve shall be designed to prevent water in the irrigation pipeline under operating pressure from entering the chemical injection line.

6.6. Pumps

6.6.1. The irrigation pumping plant and the chemical injection pump shall be interlocked so that if the pumping plant stops, the injection pump will also stop. Its purpose is to prevent pumping chemicals into the irrigation pipeline after the irrigation pump stops.

6.7. Replacement equipment shall meet specified requirements and in the case of irrigation pipeline check valves, shall meet the following minimum requirements:

6.7.1. The valve body and all components shall be constructed of corrosion resistant materials or otherwise coated or protected to prevent corrosion;

6.7.2. The valve shall contain a sealing mechanism designed to close prior to or at the moment water ceases to flow in the downstream direction. This mechanism shall be either diaphragm-actuated by hydraulic line pressure, spring loaded or weight loaded to provide a watertight seal against reverse flow;

6.7.3. All moving components of the valve shall be designed to prevent binding, distortion or misalignment during water flow; and

6.7.4. The valve shall be designed to allow repair and maintenance, including removal from the pipeline if required to perform such work.

6.8. The equipment required in these Rules and regulations shall be maintained in working condition. When required, the equipment shall be repaired to its originally designed condition.

Notes

8 CCR 1206-4 Part 6

41 CR 23, December 10, 2018, effective 12/30/2018