Washington Administrative Code › Title 16 - Agriculture, Department of (See also Titles 24, 60, and 142) › GRAIN AND CHEMICAL › Chapter 16-202 - Application of pesticides and plant nutrients through irrigation systems › Part 1 - GENERAL PROVISIONS FOR CHEMIGATION OPERATION › Section 16-202-1002 - How are specific terms and phrases defined in this chapter?

Current through Register Vol. 24-14, July 15, 2024
Terms as defined in this section are applied throughout
					 this chapter.
(1) "Air gap" means an
				  unobstructed physical separation between the free-flowing discharge end of a
				  water supply and the overflow rim of an open or nonpressurized receiving
				  vessel. The separation must be at least four times the diameter of the supply
				  pipe measured vertically from the overflow rim of the receiving vessel, and in
				  no case be less than 25 mm, or 1-inch.
(2) "Alternative technology" means any device
				  or concept that meets the performance standards contained in this
				  chapter.
(3) "Antipollution safety
				  device" means any equipment or device effectively designed, constructed, and
				  maintained that is used in the event of malfunction or shutdown to prevent
				  backflow of a chemical or treated water into the water supply, or to reduce
				  human exposure or hazard to the environment. Equipment or devices may include,
				  but are not limited to, the irrigation line check valve, vacuum relief valve,
				  low-pressure drain, inspection port, metering device, chemical injection
				  closure device, and system interlock.
(4) "Application depth" means the amount of
				  irrigation water applied to a given unit area during an irrigation set, and is
				  usually expressed in inches or gallons.
(5) "Application season" means the period
				  during which product is injected into an irrigation system for crop protection,
				  plant growth, or soil preparation.
(6) "Application tank" means a product
				  container and appurtenances used for the storage of product that is dedicated
				  for use with and functionally connected to an irrigation system.
(7) "Applicator" means any certified
				  applicator or anyone who is working under the direct supervision of a certified
				  applicator.
(8) "Approved backflow
				  prevention assembly" means a reduced pressure backflow assembly, reduced
				  pressure detector assembly, double check valve detector assembly, or double
				  check valve assembly of a make, model, and size that is approved by the
				  department of health pursuant to WAC
				  246-290-490.
(9) "Approved reduced pressure backflow
				  assembly or reduced pressure detector assembly" means backflow prevention
				  assemblies of make, model, and size approved by the department of health
				  pursuant to WAC
				  246-290-490.
(10) "Aquaculture" means the cultivation of
				  water-based plants or animals.
(11)
				  "Backflow" means the reversal of fluid flow due to backpressure or
				  backsiphonage.
(12) "Backflow
				  prevention device" or "backflow safety device" means antipollution safety
				  devices that prevent the flow of water from the irrigation water distribution
				  system back to the water source or to the product source.
(13) "Barometric loop" or "gooseneck" means a
				  raised section of pipe where the bottom of the loop is at least two feet above
				  the highest water emitting device or any portion of the irrigation application
				  system which has a vacuum relief valve installed on the top of the
				  loop.
(14) "Certified applicator"
				  means any individual who is licensed as a commercial pesticide applicator,
				  commercial pesticide operator, public operator, private-commercial applicator,
				  demonstration and research applicator, or certified private applicator, or any
				  other individual who is certified by the director to use or supervise the use
				  of any pesticide that is classified by the EPA or the director as a pesticide
				  for use in a chemigation application.
(15) "Check valve" means a certified device
				  designed and constructed to provide automatic, quick-acting, and absolute
				  closure that creates and maintains a watertight seal. The device prevents flow
				  in the opposite direction of that desired when operation of the irrigation
				  system or chemical injection unit fails or is shut down.
(16) "Chemical" or "product" means a
				  pesticide or system maintenance compound.
(17) "Chemigation" means the application of
				  any substance or combination of substances intended as a pesticide, plant or
				  crop protectant, or system maintenance compound applied with irrigation
				  water.
(18) "Chemigation operation"
				  means all activities and equipment associated in preparing for, performing, and
				  concluding a chemigation application, which includes, but is not limited to,
				  calibrating, mixing, loading, starting up, operating, monitoring, or shutting
				  down a chemigation system.
(19)
				  "Chemigation system" means the chemical injection system as well as the
				  irrigation water distribution system.
(20) "Commercial fertilizer" means a
				  substance containing one or more recognized plant nutrients and which is used
				  for its plant nutrient content and/or which is designated for use or claimed to
				  have value in promoting plant growth, and shall include limes, gypsum, and
				  manipulated animal and vegetable manures. It shall not include unmanipulated
				  animal and vegetable manures and other products exempted by the department by
				  rule.
(21) "Contact name" means a
				  person or company responsible for placement and operation of an application
				  tank.
(22) "Decommissioned" means
				  rendering an application tank unusable for product containment.
(23) "Deep percolation" means the movement of
				  water downward through the soil profile below a plant's effective rooting
				  zone.
(24) "Department" means the
				  Washington state department of agriculture.
(25) "End gun" means an intermittent, high
				  volume water-emitting device located at or near the end of an irrigation
				  application system.
(26)
				  "Environment" means any plant, animal, natural resource, surface water
				  (including underlying sediments), groundwater, drinking water supply, land
				  surface or subsurface strata, or ambient air within the state of Washington or
				  under the jurisdiction of the state of Washington.
(27) "Homemade" means devices not otherwise
				  commercially available for sale or not manufactured for the purpose of
				  commercial sale.
(28) "Hydroponic"
				  means the practice of growing plants in an aqueous solution, moist inert
				  material, or otherwise in the absence of a mineral-based medium.
(29) "Imminent danger" means a threat to
				  human health or the environment that is likely to happen during the current
				  application.
(30) "Injection
				  system" means all components used to supply, deliver, meter, and inject a
				  substance into an irrigation system. This includes devices and components
				  located between and inclusive of the application tank and the point of product
				  discharge into the irrigation water, including components of the system
				  interlock.
(31) "Inspection port"
				  means an orifice or other viewing device from which the low pressure drain and
				  irrigation line check valve may be assessed for proper operation.
(32) "Irrigation application system" means
				  the physical components of an irrigation system that begins at the first water
				  emitting device and ends with the last water emitting or purging
				  device.
(33) "Irrigation season"
				  means that period of time during which supplemental water is applied to aid in
				  plant development, soil conditioning, temperature modification, or other such
				  purposes.
(34) "Irrigation system"
				  means all components used in diverting, supplying, distributing, and applying
				  irrigation water.
(35) "Irrigation
				  water distribution system" means all components inclusive of the irrigation
				  water supply system and the irrigation application system.
(36) "Irrigation water supply system" means
				  the water conveyance system, which begins at the point of diversion from the
				  irrigation water source and ends with the first water emitting
				  device.
(37) "Metering device"
				  means a positive displacement injection pump, venturi device, or gravity feed
				  device capable of being calibrated and used to gauge chemical placement into
				  the irrigation water distribution system.
(38) "Nonpressurized water delivery system"
				  means a method of irrigation in which water is distributed over the soil
				  surface by gravity flow, such as rill, border, gated pipe, or spigotted
				  pipe.
(39) "Offsite application"
				  means the application or movement of product from the target site.
(40) "Operator" means the individual who is
				  performing a chemigation operation and who may or may not be the certified
				  applicator.
(41) "Outtake" means an
				  opening that provides a source of untreated water.
(42) "Rinsate" means the liquid produced from
				  the rinsing of any equipment or container that has come in direct contact with
				  any pesticide or system maintenance compound.
(43) "Runoff" means surface water leaving the
				  target site.
(44) "Sensitive
				  area(s)" mean schools, parks, dwellings, occupied buildings or structures,
				  public roadways, waters of the state, or other areas in which off-target
				  movement may endanger humans, animals, crops, or the environment.
(45) "Source water" or "water source" means
				  an aquifer or surface water body, including a stream, stream system, lake,
				  reservoir, or off-farm irrigation water ditch or conveyance system, and any
				  spring water or underground water that is part of or tributary to the surface
				  water body or aquifer.
(46) "System
				  interlock" means the arrangement or interconnection of the irrigation pump or a
				  pressure or flow sensing device with the chemical injection unit or other pumps
				  in such a manner that shutdown of the chemigation injection system will occur
				  in the event of any component malfunction or failure that substantially impacts
				  the application rate.
(47) "Vacuum
				  relief valve" means a device that automatically relieves or breaks a vacuum,
				  thereby preventing backsiphoning.
(48) "Washwater" means the liquid produced
				  from the rinsing of the exterior of any equipment or containers that have or
				  may have come in direct contact with any pesticide or system maintenance
				  compound.
(49) "Waters of the
				  state" means, but is not limited to, lakes, rivers, ponds, streams, inland
				  waters, underground waters, salt waters, irrigation canals and
				  reservoirs.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-1002, filed 11/9/01, effective
						11/9/01.