reglab/statecodes huggingface dataset:
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1012 - What measures must be used to prevent backflow into the irrigation water source?

Current through Register Vol. 24-14, July 15, 2024
Backflow prevention is a requirement on all irrigation
					 systems used for chemigation, except when alternative technology is
					 applied.
(1) Pressurized irrigation
				  system.
(a) At least one irrigation mainline
				  check valve must be correctly installed, properly operated, and adequately
				  maintained to prevent contamination of the water source. The check valve must
				  be located upstream from the injection point. The check valve must be
				  automatic, quick-closing, and capable of forming and maintaining a watertight
				  seal.
(b) An inspection port or a
				  direct access point must be positioned immediately upstream of the check valve
				  to allow visual and manual inspection of the check valve and the low pressure
				  drain. The inspection port or access point must have a minimum diameter of four
				  inches. If a four-inch inspection port or access point is not feasible, an
				  alternative access system must be devised.
(c) An inspection port or access point is not
				  required with an approved backflow prevention assembly.
(d) A vacuum relief valve must be located
				  upstream of the irrigation line check valve, installed at the top of the
				  irrigation pipeline, and adequately sized to prevent backsiphoning. The orifice
				  size must comply with current American Society of Agricultural Engineers (ASAE)
				  standards.
(e) An automatic low
				  pressure drain or similar mechanism must be placed upstream of the irrigation
				  line check valve and at the lowest point in the bottom of the pipeline. The low
				  pressure drain must be of adequate size and properly positioned to intercept
				  and purge leakage away from the water source.
(f) Product-treated water cannot be
				  discharged through a water outtake.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1013 - What alternative methods may be used to prevent backflow into the irrigation water source?

Current through Register Vol. 24-14, July 15, 2024
The application of alternative technology in achieving
					 backflow prevention must be accomplished either by a backflow system or by
					 system design to fulfill the provisions of this chapter. The operator must be
					 able to demonstrate that backflow cannot occur. Alternative technology must
					 provide substantially equal or greater protection than the provisions of this
					 chapter.
(1) System design.
(a) If a system's configuration will provide
				  substantially equal or greater protection due to the physical laws of gravity
				  and water hydraulics, components of a backflow prevention system may be waived
				  by the department.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1014 - What are the prevention requirements for backflow into or seepage from application tanks?

Current through Register Vol. 24-14, July 15, 2024
All irrigation and injection systems used for chemigation
					 must prevent backflow into the application tank. Leakage or siphonage from the
					 application tank through the injection system into the irrigation system must
					 also be prevented.
(1) Injection into
				  a pressurized section of an irrigation system must include:
(a) An automatic, quick-acting injection line
				  check valve must be used to prevent leakage from the application tank into
				  irrigation water and to prevent irrigation water from entering the chemical
				  injection line. The injection line check valve must maintain, at a minimum, 10
				  psi opening (cracking) pressure or adequate opening pressure to prevent gravity
				  flow due to hydraulic head pressure from the application tank. The check valve
				  must be located at the point of product injection into the irrigation water;
				  and
(b) Where siphon action induced
				  by an irrigation system could compromise the cracking (opening) pressure of an
				  injection line check valve, a vacuum relief valve must be installed in the
				  irrigation line downstream of the injection point. The orifice size must comply
				  with current American Society of Agricultural Engineers (ASAE)
				  standards.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1015 - What alternative methods may be used to prevent backflow into or seepage from application tanks?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for backflow prevention must be
					 accomplished by system design to fulfill the provisions of this chapter.
(1) In lieu of a normally closed solenoid
				  with the injection system.
(a) A normally open
				  valve must be located in the chemical injection line between the application
				  tank and a positive displacement injection pump. The normally open valve must
				  be spring-loaded, and must close upon a vacuum and open at atmospheric
				  pressure. It must be elevated at least twelve inches above the maximum fluid
				  level in the application tank and must be the highest point in the injection
				  line.
(b) The mechanism described
				  in (a) of this subsection cannot be used in conjunction with a venturi
				  injection system.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1016 - What are the requirements for metering devices?

Current through Register Vol. 24-14, July 15, 2024
Metering devices must be capable of being accurately
					 calibrated. Metering devices must control the rate of product injection into
					 irrigation water and discontinue product delivery when the predetermined
					 application quantity has been dispensed. All metering systems must be
					 functionally interlocked with the source irrigation pump or irrigation water
					 distribution system.
(1) Injecting
				  product with a pressurized metering pump.
(a)
				  The metering pump must be of a positive displacement design.
(b) Water-powered injection pumps can only be
				  used when no other power source is available to operate the injection
				  unit.
(c) The metering pump must be
				  interlocked to the irrigation system in the event of an irrigation system
				  malfunction or failure.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1017 - What are alternative methods for metering?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for metering product must
					 fulfill the provisions of this chapter. A person cannot function as a metering
					 device.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-1017, filed 11/9/01, effective
						11/9/01.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1018 - What are the requirements for product injection devices?

Current through Register Vol. 24-14, July 15, 2024
The irrigation water source and application tank must be
					 protected from backflow and from siphonage.
(1) Pressurized injection or injection into a
				  pressurized portion of an irrigation system.
(a) An injection line check valve must be
				  used whenever injection occurs in a pressurized section of an irrigation system
				  or with a pressurized injection system.
(b) The injection line check valve must
				  inject product directly into the irrigation water and must be installed
				  downstream of the irrigation mainline check valve.
(c) The point of injection into an irrigation
				  system cannot be located within ten feet of a wellhead, public waterway,
				  off-farm irrigation supply ditch or conveyance system, or sensitive
				  area.
(d) The injection line check
				  valve mechanism must prevent leakage due to hydraulic head pressure from the
				  application tank and must prevent backflow from the irrigation water source
				  into the supply tank. The injection line check valve must maintain, at a
				  minimum, 10 psi opening (cracking) pressure or adequate opening pressure to
				  prevent gravity flow from the application tank into irrigation water.
(e) In instances where siphoning action
				  induced by an irrigation system could compromise the opening (cracking)
				  pressure of an injection line check valve, a vacuum relief valve must be
				  installed in the irrigation line downstream of the injection point.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1019 - What alternative methods may be used for product injection?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for product injection must
					 fulfill the provisions of this chapter. With a surface supplied water source,
					 the injection point must occur downstream from the point of diversion. With a
					 pressurized water source, the injection point must be located such that product
					 backflow cannot occur.
(1) Injection
				  with barometric loops.
(a) Barometric loops
				  can only be used on systems pumping from a surface water source.
(b) The barometric pipe loop must be located
				  in the water line immediately downstream of the irrigation water
				  pump.
(c) A barometric pipe loop
				  must be designed with sufficient elevation differential to compensate for
				  backflow.
(d) The bottom of the
				  barometric loop apex must be at least thirty inches above the highest
				  water-emitting device or of any portion of the irrigation application
				  system.
(e) The barometric loop
				  must contain a vacuum relief device at the loop apex that allows air into the
				  pipeline immediately upon loss of pressure. The orifice size must comply with
				  current American Society of Agricultural Engineers (ASAE) standards.
(f) The injection point on a barometric loop
				  must be located downstream of and at least thirty inches below the bottom of
				  the barometric pipe loop apex.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1020 - What are the requirements for a system interlock?

Current through Register Vol. 24-14, July 15, 2024
A system interlock must automatically shut off the
					 injection system if the irrigation pump stops operating or if variation in
					 water flow adversely affects product injection rate or product distribution
					 uniformity. The operator must be able to demonstrate that backflow cannot
					 occur.
(1) Pressurized injection
				  systems or injection into a pressurized portion of the irrigation system
				  requires either an electrical, hydraulic, or mechanical system interlock
				  device.
(2) When the injection
				  point is at a nonpressurized section of an irrigation water distribution
				  system, an interlock mechanism must discontinue product delivery in the event
				  that water flow is interrupted or sufficiently reduced such that product
				  application is adversely impacted to the target site. Furthermore, treated
				  water cannot enter waters of the state.
(3) With venturi systems.
(a) Booster or auxiliary water pumps must be
				  connected with the system interlock such that when pressure in the mainline
				  changes to the point where product distribution is adversely affected automatic
				  shutoff of product supply will occur.
(b) The supply line must contain either a
				  normally closed solenoid-operated valve connected to the system interlock or a
				  normally closed hydraulically operated valve that opens only when the main
				  water line is adequately pressurized. If a booster or auxiliary pump is used in
				  conjunction with a venturi system, the normally closed solenoid must be
				  electrically interlocked with the source pump for the irrigation
				  system.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1021 - What alternative methods can be used as a system interlock?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used as a system interlock must
					 fulfill the provisions of this chapter.
(1) A person may not serve as a human
				  interlock.
(2) Solenoid and check
				  valve.
(a) The chemical injection line must
				  contain either a normally closed solenoid-operated valve connected to the
				  system interlock or a normally closed hydraulically operated valve that opens
				  only when the main water line is adequately pressurized. A normally closed,
				  solenoid-operated valve must be placed on the intake side of the injection
				  pump, immediately adjacent to the application tank.
(b) The chemical injection line between the
				  application tank and the metering device must contain an automatic,
				  quick-closing check valve to prevent the flow of liquid back toward the
				  application tank. The check valve must be placed immediately adjacent to the
				  venturi chemical inlet.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1022 - What is an appropriate monitoring schedule?

Current through Register Vol. 24-14, July 15, 2024
(1) A chemigation application must be
				  visually inspected by a certified applicator or someone under his or her direct
				  supervision at least once during each four-hour period, unless the pesticide
				  label requires a more frequent interval. Specific applications due to location
				  or product characteristics may require more frequent monitoring.
(2) The certified applicator is considered
				  principally responsible to ensure that the chemigation system functions
				  properly and conforms with the provisions of this chapter.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-1022, filed 11/9/01, effective
						11/9/01.
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 3 - SAFETY REQUIREMENTS FOR CHEMIGATION SYSTEM › Section 16-202-1023 - Public water system cross-connections or connections to a potable water supply intended for human use

Current through Register Vol. 24-14, July 15, 2024
(1) If the irrigation system is
				  cross-connected to a public water system, Washington state department of health
				  (DOH) rules (WAC
				  246-290-490 ) apply to backflow
				  prevention.
(2) Cross-connections
				  of a chemigation system to any potable water system intended for human use must
				  have either a department of health-approved reduced pressure backflow assembly
				  or reduced pressure detector assembly installed for backflow prevention.
				  Otherwise, a physical separation in the form of an air gap may be used to
				  protect the water source.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-1023, filed 11/9/01, effective
						11/9/01.
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 4 - PENALTIES AND PENALTY ASSIGNMENT SCHEDULE FOR CHEMIGATION OPERATION › Section 16-202-1024 - Penalties

Current through Register Vol. 24-14, July 15, 2024
(1) Any person who
				  fails to comply with any provision of this chapter shall be subject to denial,
				  suspension, or revocation of any license, registration, or permit provided for
				  in RCW
				  15.58.260,
				  15.58.335,
				  15.58.345, and
				  RCW
				  17.21.300 and
				  17.21.315 and/or imposition of a
				  civil penalty as provided therein.
(2) The director may bring an action to
				  enjoin the violation or threatened violation of any provision of this chapter
				  or any rule made pursuant to this chapter in a court of competent jurisdiction
				  of the county in which such violation occurs or is about to occur.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-1024, filed 11/9/01, effective
						11/9/01.
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 5 - GENERAL PROVISIONS FOR FERTIGATION OPERATION › Section 16-202-2001 - What is the purpose of this chapter?

Current through Register Vol. 24-14, July 15, 2024
The purpose of this chapter is to establish performance
					 standards for fertigation that are protective of existing and future uses of
					 surface water and groundwater quality.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2001, filed 6/18/01, effective
						11/9/01.
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 6 - GENERAL REQUIREMENTS FOR FERTIGATION OPERATION › Section 16-202-2003 - What are the general requirements in performing a fertigation operation?

Current through Register Vol. 24-14, July 15, 2024
The applicator and fertigation system must comply with the
					 following performance requirements to protect human health, source water, and
					 the environment. The fertigation operator is responsible for safe application
					 and for the proper operation of the fertigation equipment.
(1) A fertigation system must be designed,
				  constructed, installed, operated, and maintained in accordance with the
				  provisions of this chapter.
(2)
				  Substituted alternative technology not otherwise identified in this chapter
				  must be evaluated by the department to determine if the provisions of this
				  chapter have been fulfilled.
(3)
				  All commercial fertilizers used for fertigation must meet Washington state
				  fertilizer standards. This does not prohibit fertigation systems from being
				  used to apply other products such as reclaimed water, animal effluent, or
				  similar substances provided that the appropriate antipollution devices are
				  present and the provisions of this law are met.
(4) During a fertigation application, an
				  irrigation system and injection system are considered one unit, and the
				  applicator is responsible for their proper operation.
(5) All applicable fertilizer laws, in
				  addition to those contained in this chapter, pertain to fertigation.
(6) A fertigation system cannot draw water
				  from any water supply unless that supply is protected from contamination. The
				  fertigation operator must verify that backflow cannot occur.
(7) The application must be continuously
				  monitored whenever sensitive areas are at risk of being exposed to drift,
				  runoff, or overspray.
(8) All
				  fertigation systems and system components must allow for adequate visual,
				  physical, and manual inspection.
(9) A fertigation system must be flushed out
				  and rinsed off after an application.
(10) All components must be chemically
				  compatible with injected materials, water containing injected materials, and
				  system pressure.
(11) Equipment
				  must be calibrated and maintained in a manner to prevent misapplication or
				  offsite application of any product.
(12) Safety devices and injection equipment
				  must be installed, operated, and maintained in accordance with the
				  manufacturer's specifications, established industry standards, and department
				  rule.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-2003, filed 11/9/01, effective
						11/9/01.
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 6 - GENERAL REQUIREMENTS FOR FERTIGATION OPERATION › Section 16-202-2004 - What are the identification requirements for application tanks?

Current through Register Vol. 24-14, July 15, 2024
The purpose of identification requirements is to minimize
					 the potential for human exposure and to facilitate remediation in the event of
					 component malfunction or a contamination event.
(1) An application tank must:
(a) List tank contents, using the
				  industry-accepted identifier for the principal product(s);
(b) Display its maximum net
				  capacity;
(c) Display a contact
				  name and telephone number; and
(d)
				  Display an owner-derived numeric or alphanumeric tank identifier.
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 6 - GENERAL REQUIREMENTS FOR FERTIGATION OPERATION › Section 16-202-2005 - What are the placement requirements for application tanks?

Current through Register Vol. 24-14, July 15, 2024
Application tanks cannot be located in an area or placed in
					 such a manner to contaminate water or to endanger human health, sensitive
					 areas, or the environment.
(1)
				  Application tanks should be positioned downgradient from wellheads, public
				  waterways, off-farm irrigation supply ditches or conveyance systems, or
				  sensitive areas.
(a) If downgradient
				  placement is not feasible, earthen berms or other structures of sufficient
				  design must be constructed to divert spillage, leakage, or surface flow away
				  from such areas.
(b) An application
				  tank cannot be placed closer than twenty feet from wellheads, public waterways,
				  off-farm irrigation supply ditches or conveyance systems, or sensitive
				  areas.
(c) Mixing or loading
				  activities cannot occur within twenty feet of a sensitive area, wellhead,
				  public waterway, off-farm irrigation supply ditch or conveyance system, and
				  irrigation water source.
(d)
				  Alternative technology that provides substantially equal protection such as a
				  secondary containment facility that complies with the structural design
				  requirements in the secondary and operational area containment rules (chapter
				  16-201 WAC) will fulfill the requirements in paragraphs (a), (b), and (c) of
				  this subsection.
(e) Overflow from
				  an irrigation pond contaminated with product cannot enter a public waterway,
				  off-farm irrigation supply ditch or conveyance system, or sensitive
				  area.
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 6 - GENERAL REQUIREMENTS FOR FERTIGATION OPERATION › Section 16-202-2006 - Under what conditions is an application tank exempt from the secondary and operational area containment rules?

Current through Register Vol. 24-14, July 15, 2024
Application tanks functionally connected to and dedicated
					 solely for use with a fertigation operation may be exempt from the secondary
					 and operational area containment rules (chapter 16-201 WAC). The following
					 conditions determine whether a tank that is a component of a fertigation system
					 is subject to the secondary and operational area containment rules.
(1) Time-in-place.
(a) Product can remain in an application tank
				  for a period not to exceed nine consecutive months during an irrigation or
				  application season. If the nine-month period is exceeded, the tank is deemed a
				  storage facility and is therefore subject to the secondary and operational area
				  containment rules.
(b) An
				  application tank containing product during the nonapplication or nonirrigation
				  season is subject to the secondary and operational area containment rules
				  regardless of tank size.
(c) The
				  application tank must be removed at the end of the irrigation or application
				  season, whichever is shorter, but not to exceed nine months. At the end of this
				  period, the application tank must be emptied, cleaned, visually inspected for
				  integrity, and serviced. The tank must be removed from the site, or the tank
				  must be decommissioned and clearly tagged with the words "out-of-service," or
				  the tank must be managed as a permanent storage facility (chapter 16-201
				  WAC).
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 6 - GENERAL REQUIREMENTS FOR FERTIGATION OPERATION › Section 16-202-2007 - How should rinsate from equipment or backflush water from a filtration device be handled?

Current through Register Vol. 24-14, July 15, 2024
(1) Water used
				  to rinse, flush, or clean equipment or containers is considered rinsate. It
				  must be applied onto a target site or disposed of properly.
(2) Contaminated backflush water from a
				  filtration device cannot contaminate groundwater or surface water, or adversely
				  impact sensitive areas.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2007, filed 6/18/01, effective
						11/9/01.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2008 - What are the general antipollution safety device requirements for a fertigation system?

Current through Register Vol. 24-14, July 15, 2024
All systems must have antipollution safety devices that
					 include a backflow prevention system, a metering device, injection device, and
					 system interlock to prevent backflow into the irrigation water source or
					 chemical supply system.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2008, filed 6/18/01, effective
						11/9/01.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2009 - What measures must be used to prevent backflow into the irrigation water source?

Current through Register Vol. 24-14, July 15, 2024
Backflow prevention is a requirement on all irrigation
					 systems used for fertigation except when alternative technology is
					 applied.
(1) Pressurized irrigation
				  system.
(a) At least one irrigation mainline
				  check valve must be correctly installed, properly operated, and adequately
				  maintained to prevent contamination of the water source. The check valve must
				  be located upstream from the injection point. The check valve must be
				  automatic, quick-closing, and capable of forming and maintaining a watertight
				  seal.
(b) An inspection port or a
				  direct access point must be positioned immediately upstream of the check valve
				  to allow visual and manual inspection of the check valve and the low pressure
				  drain. The inspection port or access point must have a minimum diameter of four
				  inches. If a four-inch inspection port or access point is not feasible, an
				  alternative system must be devised.
(c) An inspection port or access point is not
				  required with an approved backflow prevention assembly.
(d) A vacuum relief valve must be located
				  upstream of the irrigation line check valve, installed at the top of the
				  irrigation pipeline and adequately sized to prevent backsiphoning. The orifice
				  size must comply with current American Society of Agricultural Engineers (ASAE)
				  standards.
(e) An automatic low
				  pressure drain or similar mechanism must be placed upstream of the irrigation
				  line check valve and at the lowest point in the bottom of the pipeline. The low
				  pressure drain must be of adequate size and properly positioned to intercept
				  and purge leakage away from the water source.
(f) Product-treated water cannot be
				  discharged through a water outtake.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2010 - What alternative methods may be used to prevent backflow into the irrigation water source?

Current through Register Vol. 24-14, July 15, 2024
The application of alternative technology in achieving
					 backflow prevention must be accomplished either by a backflow system or by
					 system design to fulfill the provisions of this chapter. The operator must be
					 able to demonstrate that backflow cannot occur. Alternative technology must
					 provide substantially equal or greater protection than the provisions of this
					 chapter.
(1) System design. If a
				  system's configuration will provide substantially equal or greater protection
				  due to the physical laws of gravity and water hydraulics, components of a
				  backflow prevention system may be waived by the department.
(2) Barometric pipe loop.
(a) Barometric loops can only be used on
				  systems pumping from a surface water source.
(b) The barometric pipe loop must be located
				  in the main water line immediately downstream of the irrigation water
				  pump.
(c) A barometric pipe loop
				  must be designed with sufficient elevation differential to compensate for
				  backflow.
(d) The bottom of the
				  barometric loop apex must be at least thirty inches above the highest
				  water-emitting device or of any portion of the irrigation application
				  system.
(e) The barometric loop
				  must contain a vacuum relief device at the loop apex that allows air into the
				  pipeline immediately upon loss of pressure. The orifice size must comply with
				  current American Society of Agricultural Engineers (ASAE) standards.
(f) The chemical injection port must be
				  located downstream of and at least thirty inches below the bottom of the pipe
				  loop apex.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2011 - What are the prevention requirements for backflow into or seepage from application tanks?

Current through Register Vol. 24-14, July 15, 2024
All irrigation and injection systems used for fertigation
					 must prevent backflow into the application tank. Leakage or siphonage from the
					 application tank through the injection system into the irrigation system must
					 also be prevented.
(1) Injection into
				  a pressurized section of an irrigation system must include:
(a) An automatic, quick-acting injection line
				  check valve must be used to prevent leakage from the application tank into
				  irrigation water and to prevent irrigation water from entering the chemical
				  injection line. The injection line check valve must maintain, at a minimum, 10
				  psi opening (cracking) pressure or adequate opening pressure to prevent gravity
				  flow due to hydraulic head pressure from the application tank. The check valve
				  must be located at the point of product injection into the irrigation water;
				  and
(b) Where siphon action induced
				  by an irrigation system could compromise the cracking (opening) pressure of an
				  injection line check valve, a vacuum relief valve must be installed in the
				  irrigation line downstream of the injection point. The orifice size must comply
				  with current American Society of Agricultural Engineers (ASAE)
				  standards.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2012 - What alternative methods may be used to prevent backflow into or seepage from application tanks?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for backflow prevention must be
					 accomplished by system design to fulfill the provisions of this chapter.
(1) In lieu of a normally closed solenoid
				  with the injection system.
(a) A normally open
				  valve must be located in the chemical injection line between the application
				  tank and a positive displacement injection pump. The normally open valve must
				  be spring-loaded, and must close upon a vacuum and open at atmospheric
				  pressure. It must be elevated at least twelve inches above the maximum fluid
				  level in the application tank and must be the highest point in the injection
				  line.
(b) The mechanism described
				  in (a) of this subsection cannot be used in conjunction with a venturi
				  injection system.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2013 - What are the requirements for metering devices?

Current through Register Vol. 24-14, July 15, 2024
Metering devices must be capable of being accurately
					 calibrated. Metering devices must control the rate of product injection into
					 irrigation water and discontinue product delivery when the predetermined
					 application quantity has been dispensed. All metering systems must be
					 functionally interlocked with the source irrigation pump or irrigation water
					 distribution system.
(1) Injecting
				  product with a pressurized metering pump.
(a)
				  The metering pump must be of a positive displacement design.
(b) Water-powered injection pumps can only be
				  used when no other power source is available to operate the injection
				  unit.
(c) The metering pump must be
				  interlocked to the irrigation system in the event of an irrigation system
				  malfunction or failure.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2014 - What are alternative methods for metering?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for metering product must
					 fulfill the provisions of this chapter.
A person may function as a metering device with a
					 nonpressurized irrigation delivery system. However, the individual must remain
					 on-site to continuously monitor the application and be immediately available to
					 terminate the application in the event of equipment malfunction. The person
					 must be knowledgeable about the operation of the irrigation and injection
					 systems.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2014, filed 6/18/01, effective
						11/9/01.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2015 - What are the requirements for product injection devices?

Current through Register Vol. 24-14, July 15, 2024
The irrigation water source and application tank must be
					 protected from backflow and from siphonage.
(1) Pressurized injection or injection into
				  pressurized irrigation system.
(a) An
				  injection line check valve must be used whenever injection occurs in a
				  pressurized section of an irrigation system or with a pressurized injection
				  system.
(b) The injection line
				  check valve must inject product directly into the irrigation water and must be
				  installed downstream of the irrigation mainline check valve.
(c) The point of injection into an irrigation
				  system cannot be located within ten feet of a wellhead, public waterway,
				  off-farm irrigation supply ditch or conveyance system, or sensitive
				  area.
(d) The injection line check
				  valve mechanism must prevent leakage due to hydraulic head pressure from the
				  application tank and must prevent backflow from the irrigation water source
				  into the supply tank. The injection line check valve must maintain, at a
				  minimum, 10 psi opening (cracking) pressure or adequate opening pressure to
				  prevent gravity flow from the application tank.
(e) In instances where siphoning action
				  induced by an irrigation system could compromise the opening (cracking)
				  pressure of a injection line check valve, a vacuum relief valve must be
				  installed in the irrigation line downstream of the injection point.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2016 - What alternative methods may be used for product injection?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used for product injection must
					 fulfill the provisions of this chapter. With a surface supplied water source,
					 the injection point must occur downstream from the point of diversion. With a
					 pressurized water source, the injection point must be located such that product
					 backflow cannot occur.
(1) Injection
				  with barometric loops.
(a) Barometric loops
				  can only be used on systems pumping from a surface water source.
(b) The barometric loop must be located in
				  the water line immediately downstream of the irrigation water pump.
(c) A barometric pipe loop must be designed
				  with sufficient elevation differential to compensate for backflow.
(d) The bottom of the barometric loop apex
				  must be at least thirty inches above the highest water-emitting device or of
				  any portion of the irrigation application system.
(e) The barometric loop must contain a vacuum
				  relief device at the loop apex that allows air into the pipeline immediately
				  upon loss of pressure. The orifice size must comply with current American
				  Society of Agricultural Engineers (ASAE) standards.
(f) The injection point on a barometric loop
				  must be located downstream of and at least thirty inches below the bottom of
				  the barometric pipe loop apex.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2017 - What are the requirements for a system interlock?

Current through Register Vol. 24-14, July 15, 2024
A system interlock must automatically shut off the
					 injection system if the irrigation pump stops operating or if variation in
					 water flow adversely affects product injection rate or product distribution
					 uniformity. The operator must be able to demonstrate that backflow cannot
					 occur.
(1) Pressurized injection
				  systems or injection into a pressurized portion of the irrigation system
				  requires either an electrical, hydraulic, or mechanical system interlock
				  device.
(2) When the injection
				  point is at a nonpressurized section of an irrigation water distribution
				  system, a slide metering scale or batch tank may function as the system
				  interlock.
(3) With venturi
				  systems.
(a) Booster or auxiliary water pumps
				  must be connected with the system interlock such that when pressure in the
				  mainline changes to the point where product distribution is adversely affected
				  automatic shutoff of product supply will occur.
(b) The supply line must contain either a
				  normally closed solenoid-operated valve connected to the system interlock or a
				  normally closed hydraulically operated valve that opens only when the main
				  water line is adequately pressurized. If a booster or auxiliary pump is used in
				  conjunction with a venturi system, the normally closed solenoid must be
				  electrically interlocked with the source pump for the irrigation
				  system.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2018 - What alternative methods can be used as a system interlock?

Current through Register Vol. 24-14, July 15, 2024
Alternative technology used as a system interlock must
					 fulfill the provisions of this chapter.
(1) Human interlock. In lieu of an automatic
				  interlock, a person may serve as a system interlock. The individual must
				  continuously monitor the application, be alert throughout the application
				  process, be immediately available to terminate the application in the event of
				  equipment malfunction, and be knowledgeable about the operation of the
				  irrigation and injection systems.
(2) Solenoid and check valve.
(a) The chemical injection line must contain
				  either a normally closed solenoid-operated valve connected to the system
				  interlock or a normally closed hydraulically operated valve that opens only
				  when the main water line is adequately pressurized. A normally closed,
				  solenoid-operated valve must be placed on the intake side of the injection
				  pump, immediately adjacent to the application tank.
(b) The chemical injection line between the
				  application tank and the metering device must contain an automatic,
				  quick-closing check valve to prevent the flow of liquid back toward the
				  application tank. The check valve must be placed immediately adjacent to the
				  venturi chemical inlet.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2019 - What is an appropriate monitoring schedule?

Current through Register Vol. 24-14, July 15, 2024
A fertigation application must be visually inspected at
					 least daily to ensure that system components are functioning properly. Specific
					 applications due to location or product characteristics may require more
					 frequent monitoring.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2019, filed 6/18/01, effective
						11/9/01.
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 7 - SAFETY REQUIREMENTS FOR FERTIGATION SYSTEM › Section 16-202-2020 - Public water system cross-connections or connection to a potable water supply intended for human use

Current through Register Vol. 24-14, July 15, 2024
(1) If
				  the irrigation system is cross-connected to a public water system, Washington
				  state department of health (DOH) rules (WAC
				  246-290-490 ) apply to backflow
				  prevention.
(2) Cross-connections
				  of a fertigation system to any potable water system intended for human use must
				  have either a department of health-approved reduced pressure backflow assembly
				  or reduced pressure detector assembly installed for backflow prevention.
				  Otherwise, a physical separation in the form of an air gap may be used to
				  protect the water source.
Statutory Authority:
						Chapters
						15.54, 15.58, 17.21, and
						34.05 RCW. 01-23-018, §
						16-202-2020, filed 11/9/01, effective 11/9/01. Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2020, filed 6/18/01, effective
						11/9/01.
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 8 - PENALTIES AND PENALTY ASSIGNMENT SCHEDULE FOR FERTIGATION OPERATION › Section 16-202-2021 - Penalties

Current through Register Vol. 24-14, July 15, 2024
(1) Any person who
				  fails to comply with any provision of this chapter shall be subject to
				  imposition of a civil penalty as provided in
				  RCW
				  15.54.474.
(2) The director may bring an action to
				  enjoin the violation or threatened violation of any provision of this chapter
				  or any rule made pursuant to this chapter in a court of competent jurisdiction
				  of the county in which such violation occurs or is about to occur.
Statutory Authority:
						Chapters
						15.54, 15.58, and 17.21
						RCW. 01-13-063, § 16-202-2021, filed 6/18/01, effective
						11/9/01.