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Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-2 - Objective

Current through July 13, 2024
This Chapter contains the minimum standards for the design
				  and construction of small wastewater systems that are defined by
				  W.S.
				  35-11-103(c)(ix). In
				  addition, this Chapter contains the minimum standards for the design and
				  construction of Underground Injection Control (UIC) Class V facilities 5C1-5C3,
				  5C6, 5D1, 5E1, 5E3-5E5 as defined in Chapter 27, Appendices C and D.
The following situations will require the application package
				  to be sealed, signed, and dated by a professional engineer (PE): non-domestic
				  wastewater from commercial and industrial facilities, high strength wastewater,
				  individual permits to construct, or standard soil absorption systems with a
				  soil percolation rate that is either less than 5 minutes per inch (mpi) or more
				  than 60 minutes per inch (mpi).
These standards pertain to permits required pursuant to
				  Chapters 3 and 25, Wyoming Water Quality Rules and Regulations. The
				  installation of all components of a small wastewater system require a permit to
				  construct. Permits to construct are specified throughout this chapter as
				  general permits, described in Chapter 3, Section
				  7; permit by rule, described in Chapter 3,
				  Section 8; or as individual
				  permits to construct, described in Chapter 3, Section
				  6.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-3 - Timing of Compliance with These Regulations

Current through July 13, 2024
Any Chapter 3 permit-to-construct issued for facilities
				  subject to this chapter prior to the effective date of these regulations, and
				  any facility authorized under the Division's "General Permit to Construct,
				  Install, Modify or Operate a Small Wastewater Facility" shall remain covered
				  under those permits. New construction or modification of existing facilities
				  following the effective date of this regulation must obtain authorization under
				  a new permit.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-5 - Design Flows

Current through July 13, 2024
The volume of wastewater shall be determined by one of the
				  following:
(a) Tables 1 and 2 provided
				in this section.
(b) Metered water
				supply data from the facility.
(c)
				Metered water supply data from another facility where similar water demands
				have been demonstrated.
Table 1.
Residential Design Flow Rates
				  per Bedroom (gallons per day, gpd)1
1 bedroom
150
2 bedrooms
280
3 bedrooms
390
4 bedrooms
470
5 bedrooms
550
6 bedrooms
630
1An unfinished basement is considered
				  two (2) additional bedrooms.
2The design flow shall be increased by
				  eighty (80) gpd for each additional bedroom over six (6).
Table 2.
Non-Residential Wastewater
				  Design Flow Rates1
Facility
Unit
Flow (gallons/unit/day)
Airports
person
4
Apartment
bedroom
120
Automobile Service Station
vehicle served
10
Bars
seat
20
Bathhouses and swimming pools
person
10
Campgrounds (w/ toilets only)
person
25
Campgrounds (w/shower facility)
person
45
Church
person
4
Country Club
member
25
Day School, Office Building, Retail Store, Warehouse (no
						  showers)
person
15
Hospital
bed
250
Industrial Building (sanitary waste only)
employee
20
Laundry (self-service)
machine
450
Mobile Home
bedroom
see table 1
Motel, Hotel, Resort
bedroom
140
Recreational Vehicle
each
100
Rest Home, Care Facility, Boarding School
bed
100
Restaurant
meal
10
Restaurant ( kitchen waste only)
meal
6
Theater
seat
3
1Values shown in the above table are
				  the typical flow rates from
Wastewater Engineering Treatment and
				  Reuse
, Metcalf and Eddy, 2003.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-6 - Systems Not Specifically Covered by This Rule

Current through July 13, 2024
This section is provided to encourage new technology and
				  equipment and provide a process for evaluating and permitting designs that
				  deviate from this rule. The proposed construction of facilities and processes
				  not in compliance with this rule may be permitted provided that the facility,
				  when constructed and operated, meets the objective of these rules.
(a) Each application for a permit to
				construct shall include an engineering design report, detailed construction
				plans, and technical specifications for all piping, tanks, and equipment. All
				of the documents shall have a suitable title showing the owner's name and the
				Wyoming registration number, seal, and signature of the engineer.
(b) Each application for a permit to
				construct will be evaluated on a case-by-case basis using the best available
				technology. The application shall include at least one of the following:
(i) Data obtained from a full scale,
				comparable installation that demonstrates the acceptability of the
				design.
(ii) Data obtained from a
				pilot plant operated under the design condition for a sufficient length of time
				to demonstrate the acceptability of the design.
(iii) Data obtained from the theoretical
				evaluation of the design that demonstrates a reasonable probability the
				facility will meet the design objectives.
(iv) An evaluation of the flexibility of
				making corrective changes to the constructed facility in the event it does not
				function as planned.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-7 - Site Suitability

Current through July 13, 2024
(a) Small
				wastewater systems must be located where the surface drainage is sufficient to
				allow proper operation of the small wastewater system. Avoid depressions and
				bases of slopes and areas in the path of runoff from roofs, patios, driveways,
				or other paved areas unless surface drainage is provided. Small wastewater
				systems shall not be located beneath buildings, parking lots, roadways,
				driveways, irrigated landscaping, or compacted areas.
(b) The site must include area for both the
				proposed soil absorption system and a future replacement soil absorption
				system. Both the proposed and replacement soil absorption systems shall be
				sized to receive one-hundred (100%) percent of the wastewater flow. If a trench
				system is used, the replacement soil absorption system may be located between
				the trenches of the proposed soil absorption system if there is at least nine
				(9) feet of spacing between trench sidewalls.
(c) For standard soil absorption systems,
				effective suitable soil depth shall extend at least four (4) feet below the
				bottom of the soil absorption system to any restrictive layer, fractured rock,
				or highly permeable material.
(d)
				The depth to high groundwater shall be at least four (4) feet below the bottom
				of the absorption surface for all treatment systems except pressure
				distribution. For pressure distribution systems, the depth to high groundwater
				shall be at least three (3) feet below the bottom of the absorption surface if
				the percolation rate of the soil is five (5) minutes per inch or greater (5-60
				mpi).
(e) Slope
(i) Table 3 shows the maximum permissible
				slopes of the site on which an absorption system may be constructed
Table 3. Slope and Percolation Rates for Absorption
				  Systems
Percolation Rate (minutes/inch)
Maximum Slope1
5
25%
6-45
20%
46-60
15%
1 Flatter slopes may be required where
				  the effluent surfaces downslope.
(ii) Serial distribution, with the use of
				drop boxes or approved fittings, is the preferred installation method for
				sloping terrain. The bottom of individual trenches shall be level and the
				trenches shall be constructed to follow the contours of the land.
(iii) The placement of multiple trenches,
				with each subsequent trench down slope of the previous trench shall be avoided
				when the addition of effluent to the soil absorption system trenches may lead
				to either an unstable slope or seepage down slope.
(iv) All absorption surfaces must be located
				at least 15 horizontal feet from the top of any break in slope that exceeds the
				maximum slope allowed.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-8 - Soil Absorption System Sizing

Current through July 13, 2024
(a) The total
				infiltration surface area of a soil absorption system shall be calculated by
				dividing the design flow rates (gpd) from Table 1 or Table 2 by the loading
				rate (gpd/ft2) found in Table 5.
Table 5. Rates of Wastewater Application for Soil
				  Absorption System Areas
Percolation Rate (mpi)
Loading Rate (gpd/ft2)
Percolation Rate (mpi)
Loading Rate (gpd/ft2)
5
0.80
21
0.45
6
0.75
22
0.44
7
0.71
23-24
0.43
8
0.68
25
0.42
9
0.65
26-27
0.41
10
0.62
28-29
0.40
11
0.60
30-31
0.39
12
0.58
32-33
0.38
13
0.56
34-35
0.37
14
0.54
36-37
0.36
15
0.52
38-40
0.35
16
0.50
41-43
0.34
17
0.49
44-46
0.33
18
0.48
47-50
0.32
19
0.47
51-55
0.31
20
0.46
56-60
0.30
(b) The total
				infiltration area shall be defined as follows:
(i) For standard trenches the total
				infiltration area shall be calculated based on the following formula:
A = L(W + 2S)
A
= Total infiltration area
L
= Total length of trench
W
= Bottom width
S
= Sidewall height of 12 inches or
				  less
(A) The sidewall height is the
				depth below the flowline of the pipe to the bottom of the trench.
(B) The maximum credit for sidewall height
				shall not exceed twelve (12) inches even if the actual sidewall height exceeds
				twelve inches.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-9 - Building Sewer Pipes

Current through July 13, 2024
All building sewers shall be installed in accordance with the
				  2012 International Plumbing Code (IPC). In the absence of a locally approved
				  plumbing code, and in addition to the IPC, the building sewer shall comply with
				  the following:
(a) Suitable building
				sewer pipe materials are polyvinyl chloride (PVC) or
				acrylonitrile-butadiene-styrene (ABS). The septic tank inlet and outlet pipes
				shall be schedule 40 PVC or ABS pipe and shall span the excavations for the
				septic tank and/or dosing chamber. American Society for Testing and Materials
				(ASTM) D-3034 Standard Dimension Ratio (SDR) 35 plastic pipe may be used if the
				void at the tank's side is filled with material that is granular, clean, and
				compacted.
(b) Building sewer pipes
				shall be sized to handle the peak hourly flow from the building and shall not
				be smaller than four (4) inches in diameter. When two different sizes or types
				of sewer pipes are to be connected, a proper type of fitting or conversion
				adapter shall be used.
(c) Sewer
				pipe shall not decrease in size flowing downstream.
(d) Building sewer pipes shall be laid at a
				standard slope of 1/4 inch per foot, and shall not be flatter than 1/8 inch per
				foot.
(e) Cleanouts shall be
				provided between the structure and the tank, at branch connections, every
				change in alignment, and at least every 100 feet in straight runs.
(f) All sewer piping shall be laid on a firm
				bed throughout its entire length. It shall be protected from damage due to
				rocks, hard lumps of soil, debris, and the like.
(g) Special care shall be used to prevent
				lateral movement or deformation during backfill. The backfill material shall be
				compacted to a density at least equivalent to the trench walls. Backfill over
				the pipe shall be of sufficient depth to protect the pipe from expected traffic
				loads and the wastewater from freezing.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-11 - Effluent Distribution Devices

Current through July 13, 2024
Distribution boxes and flow divider tees are suitable for
				  level or nearly level ground and are installed before the soil absorption
				  system with the goal of splitting flows equally between soil absorption system
				  laterals. Drop boxes are suitable for sloping ground and are installed to
				  achieve serial loading.
(a)
				Distribution Boxes
(i) The distribution box
				shall be installed on a level, stable base to prevent tilting or settling, and
				to minimize movement from frost heave.
(ii) Boxes shall be watertight and
				constructed of concrete or other durable material.
(iii) Boxes shall be designed to accommodate
				the inlet pipe and the necessary distribution lines. The inlet piping to the
				distribution box shall be at least one (1) inch above the outlet pipes and all
				pipes shall have a watertight connection to the distribution box.
(iv) The box shall be protected against
				freezing and made accessible for observation and maintenance.
(v) Boxes shall have flow equalizers
				installed on each outflow.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-13 - Pressure Distribution Systems

Current through July 13, 2024
(a) General Design
				Requirements:
(i) The basic elements of a
				pressure distribution system include a dosing tank, filter, and a means to
				deliver specified doses to a small diameter pipe network within a soil
				absorption system. Pressure distribution is required for mound systems or for
				bed systems with a width greater than twenty-five (25) feet.
(ii) Pumps must be sized to match the
				distribution system curve or demand. Pumps shall be designed for sewage pumping
				applications and be accessible from the ground surface.
(iii) The control system for the pump and
				dosing tank shall, at a minimum, consist of a "pump off" switch, a "pump on"
				switch, and a "high liquid alarm".
(A) All
				electrical connections must be made outside of the chamber in either an
				approved weatherproof box or an explosion-proof junction box.
(B) The wiring from the junction box to the
				control box must pass through a sealing fitting to prevent corrosive gases from
				entering the control panel.
(C) All
				wires must be contained in solid conduit from the dosing chamber to the control
				box.
(iv) The pressure
				transport piping between the tank and the soil absorption system shall be
				designed to prevent freezing.
(A) The ends of
				lateral piping shall be constructed with long sweep elbows or an equivalent
				method to bring the end of the pipe to finished grade. The ends of the pipe
				shall be provided with threaded plugs, caps, or other devices to allow for
				access and flushing of the lateral.
(B) All joints in the manifold, lateral
				piping, and fittings shall be solvent-welded using the appropriate joint
				compound for the pipe material. Pressure transport piping may be solvent-welded
				or flexible gasket jointed.
(C)
				Where automatic siphons or other devices are used, they shall be designed to
				empty the dosing tank in less than ten (10) minutes.
(v) The pressure distribution system shall
				have a combination of at least three (3) vertical feet of filter sand and/or
				unsaturated native soil above the high groundwater level. The filter sand shall
				conform to ASTM C-33, with less than 2% passing the #200 sieve.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-14 - Sand Mound Systems

Current through July 13, 2024
The sand mound consists of a sand fill, an aggregate bed and
				  a soil cap.
(a) Selection Criteria:
The high groundwater level, bedrock, or impervious clay layer
				  is less than four (4) feet below the bottom of the soil absorption system
				  excavation.
(b) Site
				Requirements:
(i) A minimum of one (1) foot of
				vertical separation of the native soil is required between the bottom of the
				sand fill and the top of the high groundwater level, any restrictive layer, or
				any highly permeable material.
(ii)
				The percolation rate of the native soil at the interface of the sand fill shall
				be greater than five (5) and less than sixty (60) minutes per inch (5-60 mpi).
				The percolation shall be measured in the top twelve (12) inches of native
				soil.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-15 - Small Wastewater Lagoons

Current through July 13, 2024
(a) Selection
				Criteria:
(i) Lagoons shall only be
				considered in areas of Wyoming where the annual evaporation exceeds the annual
				precipitation during the active use of the lagoon.
(ii) Lagoons shall only be allowed when the
				percolation rate exceeds sixty (60) minutes per inch and the soil extends
				vertically down at least two (2) feet from the bottom of the lagoon to the
				seasonal high groundwater table or bedrock formations.
(iii) A lagoon shall not be constructed
				within the 100 year floodplain.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-16 - Privies or Outhouses

Current through July 13, 2024
Privies or outhouses that meet the requirements of this
				  section are permitted by rule. A permit by rule requires the owner to submit
				  the information contained in paragraph (g) of this section to the Wyoming
				  Department of Environmental Quality, Water Quality Division prior to
				  constructing or installing the facility. By submission of the required
				  information, the owner acknowledges and certifies they will comply with the
				  requirements contained in this section.
Pre-fabricated privies or outhouses shall be sealed,
				  water-tight vaults and shall meet the following conditions:
(a) The horizontal setback distance
				  requirements for sealed privies or outhouses shall comply with Section
				  7(g) for septic
				  tanks.
(b) The depth to seasonally
				  high groundwater from the bottom of a water tight vault shall be sufficient to
				  prevent floatation of the empty vault.
(c) The vault must have sufficient capacity
				  for the dwelling served, and must have at least 27 cubic feet or 200 gallons of
				  capacity.
(d) Privies or outhouses
				  must be insect tight; must have a self-closing door; the privy or outhouse seat
				  must include a cover; and all exterior openings, including vent openings, shall
				  be screened.
(e) Privies or
				  outhouses must be adequately vented.
(f) Privies or outhouses shall not be
				  constructed within the 100 year floodplain.
(g) Owner's name, address, phone number,
				  legal description of privy or outhouse (address, latitude/longitude, or
				  ¼¼ section), and the date construction or installation will
				  begin.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-17 - Greywater Systems

Current through July 13, 2024
Greywater systems that meet the requirements of this section
				  are permitted by rule. A permit by rule requires the owner to submit the
				  information contained in paragraph (e) of this section to the Wyoming
				  Department of Environmental Quality, Water Quality Division prior to
				  constructing, modifying, or installing the system. By submission of the
				  required information, the owner acknowledges and certifies they will comply
				  with the requirements contained in this section.
(a) Greywater Operation and Requirements
(i) Restrictions
(A) Greywater shall not leave the property on
				which it is generated. Ponding or runoff is prohibited.
(B) Greywater systems shall not be installed
				in a delineated floodplain.
(C) The
				volume of greywater shall not exceed an average of 2000 gallons per
				day.
(D) Greywater shall not come
				in direct contact with or adversely impact surface or groundwater.
(E) Food crops for direct human consumption
				should not be harvested for 30 days after application of greywater.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS › Section 25-18 - Operation and Maintenance

Current through July 13, 2024
(a) For any system
				that disposes of wastewater through land application or subsurface filtration,
				the owner shall not add any chemical or biochemical additive to the system that
				would adversely affect the quality of the groundwater as stated in the WDEQ
				Water Quality Rules & Regulations, Chapter 8.
(b) Septic tanks shall be pumped as needed to
				prevent solids carryover into the soil absorption system.
(c) Holding tanks and sealed vaults shall be
				pumped prior to reaching their maximum capacity.
(d) Any service provider that pumps septic
				tanks, holding tanks, or sealed vaults, shall dispose of the wastewater
				contents at a permitted wastewater treatment facility or in a manner approved
				by the Division or delegated authority.
(e) Damaged fittings and broken, crushed or
				plugged piping associated with any small wastewater system shall be replaced in
				a timely manner.
(f) Composting or
				non-discharging toilets, where permitted, shall have their waste disposed of at
				a permitted wastewater treatment facility or landfill, or in a manner approved
				by the Division or delegated authority.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-1 - General Information

Current through July 13, 2024
This part contains minimum standards for design and
				  construction and for the abandonment of wells covered by this part. The
				  applicant or permittee shall provide for design and construction to protect
				  Groundwaters of the State in accordance with the water quality standards
				  contained in Chapter 8, Water Quality Rules and Regulations.
All American Society for Testing of Materials (ASTM),
				  American Water Works Association (AWWA) and American Petroleum Institute (API)
				  specifications listed are intended to mean the latest revision.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-2 - Definitions Specific to Chapter6

Current through July 13, 2024
(a) "Abandoned
				well" means a well regulated under this part for which use has been
				discontinued for more than one year and the owner does not desire to maintain
				this well for future use; or its use has been permanently discontinued or is in
				such a state of disrepair that it cannot be used for its intended
				purpose.
(b) "Annular space" means
				the space between the well casing and the wall of the drilled hole or between
				two well casings.
(c) "Artificial
				recharge well" means well constructed to introduce water into the ground as a
				means of replenishing groundwater basins.
(d) "Commercial, municipal and industrial
				waste well" means well constructed to dispose of unusable waste or contaminated
				water resulting from a commercial activity, municipal collection, storage or
				treatment facility or an industrial activity.
(e) "Conductor casing" means a tubular
				retaining structure installed in the upper portion of a well between the wall
				of the drilled hole and the inner well casing.
(f) "Confining formation" means an
				impermeable bed or a bed of distinctly lower permeability than the adjacent
				material in which groundwater may be moving.
(g) "Destroyed well" means a well that has
				been properly filled so that it cannot produce water nor act as a vertical
				conduit for the movement of groundwater.
(h) "Geothermal well" means a well
				constructed to extract or return water to the ground after it has been used for
				heating or cooling purposes.
(i)
				"Key seating" means a stuck drill pipe or casing caused by an abrupt change in
				direction or dogleg in the drilled hole.
(j) "Miscellaneous discharge well" means a
				well constructed for a special process discharge of limited time and
				scope.
(k) "Observation and monitor
				well" means a well constructed for the purpose of observing or monitoring
				groundwater conditions.
(l)
				"Production casing" means a tubular retaining structure installed in the upper
				portion of a well between the wall of the drilled hole and the inner well
				casing.
(m) "Sounding tube" means
				the access to the well casing that allows the water level in the well to be
				periodically determined. All sounding tubes should have a screw cap.
(n) "Special process discharge well" means a
				well constructed for the use of a subsurface discharge for recovering a product
				or fluid at the surface. Special process discharges are defined in detail in
				Chapter 9, Wyoming Water Quality Rules and Regulations.
(o) "Test well" means a well constructed for
				obtaining information needed to design a well prior to its construction. Test
				wells are cased and could be converted to observation or monitoring
				wells.
(p) "Watertight" means
				impermeable to water except when under such pressure that structural
				discontinuity is produced.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-3 - Application

Current through July 13, 2024
These standards shall apply to the types of wells listed
				  below. Before a change of use for an existing well can occur, construction
				  standards contained in this part shall be met for the new use.
(a) Well type list requiring permits under
				Water Quality Rules and Regulations.
(i)
				Commercial, municipal and industrial waste wells.
(ii) Special process discharge
				wells.
(iii) Artificial recharge
				and miscellaneous discharge wells.
(iv) Geothermal wells.
(v) Observation and monitoring
				wells.
(vi) Test wells.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-4 - Well Construction Not Specifically Covered By This Part; Deviations

Current through July 13, 2024
(a) The
				Administrator may grant a deviation from the standards provided the applicant
				or permittee can supply documentation of reliability, mechanical integrity,
				design and construction to protect Groundwaters of the State in accordance with
				the water quality standards contained in Chapter 8, Wyoming Water Quality Rules
				and Regulations. Such documentation shall include:
(i) Theoretical technology; or
(ii) Full scale operation at another site
				with similar conditions; or
(iii) A
				pilot project of scope and length to justify a deviation.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-5 - Well Location/Siting

Current through July 13, 2024
(a) The top of the
				casing shall terminate above grade or above any known conditions of flooding
				from runoff or standing water. The area around the well shall slope away from
				the well. Surface drainage shall be directed away from the well.
(b) Where a well is to be near a building,
				the well shall be located at a distance from the building to provide access for
				repairs, maintenance, etc.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-6 - Sealing the Annular Space

Current through July 13, 2024
The annular space shall be sealed to protect it against
				  contamination or pollution by entrance of surface and/or shallow subsurface
				  waters. Annular seals shall be installed to provide protection for the casing
				  against corrosion, to ensure structural integrity of the casing, and to
				  stabilize the upper formation.
(a)
				Minimum depths of seal below ground surface for various uses of wells will be:
Type Well
Minimum Depth of Seal
Commercial, municipal and industrial waste
30 feet
Special process discharge
30 feet
Artificial recharge and miscellaneous discharge
30 feet
Geothermal wells
30 feet
Observation and monitoring
20 feet
Test wells
30 feet
(b)
				Sealing conditions. Following are requirements to be observed in sealing the
				annular space.
(i) Wells situated in
				unconsolidated, caving material shall have an oversized hole, at least four
				inches greater in diameter than the production casing, drilled. A conductor
				casing shall be installed. The space between the conductor casing and the
				production casing shall be filled with sealing material. The conductor casing
				may be withdrawn as the sealing material is placed.
(ii) Wells situated in unconsolidated
				material stratified with significant clay layers shall have an oversized hole
				of at least four inches greater in diameter than the production casing drilled,
				with the annular space filled with sealing material. If a clay formation is
				encountered within five (5) feet of the bottom of the seal, the seal should be
				extended five (5) feet into the clay formation.
(iii) Wells situated in soft consolidated
				formations shall have an oversized hole of at least four inches greater in
				diameter than the production casing. The annular space between the production
				casing and the drilled hole shall be filled with sealing material.
(iv) Wells situated in "hard" consolidated
				formations (crystalline or metamorphic rock) shall have an oversized hole
				drilled with the annular space filled with sealing material.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-7 - Surface Construction Features

Current through July 13, 2024
(a) Openings.
				Openings into the top of the well that are designed to provide access to the
				well, (e.g.), for measuring, chlorinating, adding gravel, etc., shall be
				protected against entrance of surface waters or foreign matter by installation
				of water tight caps or plugs. Access openings designed to permit the entrance
				or egress of air or gas shall terminate above the ground and above known flood
				levels and shall be protected against the entrance of foreign materials by
				installation of down turned and screened "U" bends. All other openings (holes,
				crevices, cracks, etc.) shall be sealed.
A sounding tube, tap hole with plug, or similar access for
				  the introduction of water level measuring devices may be affixed to the casing
				  of the well as long as the proper seal is maintained. Access ports for water
				  level or pressure measuring devices are required by the State Engineer on all
				  wells greater than four inches diameter.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-8 - Casing

Current through July 13, 2024
(a) The casing
				shall provide structural stability to prevent casing collapse during
				installation as well as drill hole wall integrity when installed, be of
				required size to convey liquid at a specified injection/recovery rate and
				pressure, and be of required size to allow for sampling.
(i) Steel casing shall meet the following
				conditions:
(A) Standard and line pipe. This
				material shall meet one of the following specifications:
(I) API Std. 5L, "Specifications for Line
				Pipe."
(II) API Std. 5LX,
				"Specifications for High-Test Line Pipe."
(III) ASTM A53 "Standard Specification for
				Pipe Steel, Black and Hot Dipped, Zinc Coated Welded and Seamless."
(IV) ASTM A120 "Standard Specifications for
				Pipe, Steel, Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless,
				for Ordinary Uses."
(V) ASTM A134
				"Standards Specifications for Electric-Fusion (arc) - Welded Steel Plate Pipe
				(Sizes 16 inches and over)."
(VI)
				ASTM A135 "Standard Specifications for Electric -Resistance - Welded Steel
				Pipe."
(VII) ASTM A139 "Standard
				Specification for Electric-Fusion (arc) - Welded Steel Pipe (Sizes 4 inches and
				over)."
(VIII) ASTM A211 "Standard
				Specifications for Spiral - Welded Steel or Iron Pipe."
(IX) AWWA C200 "AWWA Standard for Steel Water
				Pipe 6 inches and Larger."
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-9 - Sealing/Cementing Off Strata

Current through July 13, 2024
Where a well penetrates more than one aquifer or water
				  bearing strata, every aquifer and/or strata shall be sealed off to prevent
				  migration of water from one aquifer or strata to another.
(a) Strata shall be sealed off by placing
				impervious material opposite the strata and opposite the confining
				formation(s). The seal shall extend above and below the strata no less than ten
				(10) feet. The sealing material shall fill the annular space in the interval to
				be sealed, and the surrounding void spaces that might absorb the sealing
				material. The sealing material shall be placed from the bottom to the top of
				the interval to be sealed.
(b)
				Commercial, municipal and industrial waste and artificial recharge wells shall
				be sealed/ cemented in order that all aquifers are isolated over the entire
				length of casing(s) and shall be surrounded by a minimum of two (2) inches of
				sealant. The sealant/cement plug used to isolate the aquifer(s) shall extend
				fifty (50) feet above and below the interface between confining layer and the
				aquifer(s).
(c) Sealing material
				shall consist of neat cement, cement grout, or bentonite clay as per Section
				6(c).
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-10 - Well Construction, Completion, Development and Evaluation

Current through July 13, 2024
(a) Developing,
				redeveloping, or conditioning a well shall be done by methods that will not
				cause damage to the well or cause adverse subsurface conditions that may
				destroy barriers to the vertical movement of water between aquifers.
(b) The well opening shall be closed with a
				cover to prevent the introduction of undesirable material into the well and to
				ensure public safety whenever the well is not in use or when maintenance is
				being performed on the well.
(c)
				During well development, every well shall be tested for plumbness and alignment
				in accordance with AWWA or API approved standards, (i.e., deviation checks).
				The plumbing and alignment tests shall be documented to ensure problems such as
				key seating, or fatigue failures will not occur.
(d) All injection/recharge wells used for
				discharge of commercial, municipal or industrial wastes shall inject fluid
				through a tubing with a packer set immediately above the injection zone or
				tubing with an approval fluid seal as an alternative.
(e) At a minimum, all commercial, municipal
				and industrial waste, special process discharge, artificial recharge and
				miscellaneous discharge wells deviation checks and cement bond logs shall be
				conducted and documented. The Water Quality Division should be contacted prior
				to well construction or operation to determine the need for additional logs and
				tests.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 26 - WELL CONSTRUCTION STANDARDS › Section 26-11 - Plugging and Abandonment

Current through July 13, 2024
(a) All wells that
				are no longer useful (including test wells) must be plugged in order to ensure
				that groundwater supply is protected and preserved for further use and to
				eliminate the potential physical hazard. A well is considered "abandoned" when
				it has not been used for a period of one year, unless the owner demonstrates
				their intention to use the well again by properly maintaining the well in such
				a way that:
(i) The well has no defects that
				will allow the impairment of quality of water in the well or in the water
				bearing formations penetrated.
(ii)
				The well is covered and the cover is watertight.
(iii) The well is marked so that it can be
				clearly seen.
(iv) The area
				surrounding the well is kept clear of brush or debris.
Observation or test wells used in the investigation or
				  management of usable sources of groundwater by state agencies or by engineering
				  or research organizations are not considered "abandoned" so long as they are
				  maintained for this purpose. These wells shall be covered with an appropriate
				  cap, and labeled for their particular use.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 27 - UNDERGROUND INJECTION CONTROL PROGRAM CLASS I AND V WELLS › Section 27-1 - Authority

Current through July 13, 2024
These regulations are promulgated pursuant to
				  W.S.
				  35-11-101 through 1413, specifically 302, and
				  no person shall cause, threaten or allow violations of any provision contained
				  herein. These regulations fulfill Wyoming state obligations under Section 1422
				  of the Federal Safe Drinking Water Act and Federal Underground Injection
				  Control regulations found in 40 CFR 124 and 40 CFR 144-148 (both as of December
				  7, 1999).
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 27 - UNDERGROUND INJECTION CONTROL PROGRAM CLASS I AND V WELLS › Section 27-2 - Definitions

Current through July 13, 2024
The following definitions supplement those definitions
				  contained in Section
										35-11-103
				  of the Wyoming Environmental Quality Act.
(a) "Aquifer" means a zone, stratum or group
				of strata that can store and transmit water in sufficient quantities for a
				specific use.
(b) "Area of review"
				means the area for which information and analyses shall be submitted as part of
				an underground injection control permit application, and reviewed for issuance
				of a permit. The area of review must include all portions of an aquifer which
				will be affected in a measurable way within ten (10) years of the granting of a
				permit, assuming that the permit is complied with.
(c) "Background" means the constituents or
				parameters and the concentrations or measurements which describe water quality
				and water quality variability prior to the subsurface discharge.
(d) "Bore/casing annulus" means the space
				between the well bore and the well casing.
(e) "Casing/tubing annulus" means the space
				between the well casing and the tubing.
(f) "Cementing" means to seal the annular
				space around the outside of a casing string using a specially formulated
				Portland cement mixture or other hydraulic cement mixture to hold the casing in
				place and prevent any movement of fluid in this annular space. Cementing also
				includes operations to seal the well at the time of abandonment.
(g) "Cesspool" means a drywell that receives
				solely untreated domestic sewage, and which sometimes has an open bottom and/or
				perforated sides.
(h) "Class I
				well" means a well used to inject hazardous or non-hazardous industrial,
				commercial or municipal waste beneath the lowermost formation containing,
				within one- quarter (1/4) mile of the well bore, an underground source of
				drinking water.
(i) "Class II well"
				means a well regulated by the Wyoming Oil and Gas Conservation Commission,
				other than a Class II commercial disposal well, which injects fluids:
(i) Which are brought to the surface in
				connection with natural gas storage operations, or conventional oil or natural
				gas production. Non-hazardous gas plant wastes may be disposed of in a class II
				well pending Environmental Protection Agency co-approval.
(ii) For enhanced recovery of oil or natural
				gas.
(iii) For storage of
				hydrocarbons which are liquid at standard temperature and pressure.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 27 - UNDERGROUND INJECTION CONTROL PROGRAM CLASS I AND V WELLS › Section 27-3 - Applicability

Current through July 13, 2024
These regulations shall apply to all Class I, Class IV, Class
				  V, commercial oil field waste disposal wells and those gas plant waste wells
				  not regulated by the Wyoming Oil and Gas Conservation Commission. In addition,
				  these regulations shall apply to any discharge to the subsurface, including the
				  vadose zone, for all of the types of discharges listed in Appendix C of this
				  chapter.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 27 - UNDERGROUND INJECTION CONTROL PROGRAM CLASS I AND V WELLS › Section 27-4 - Timing of Compliance with These Regulations for Class V Wells

Current through July 13, 2024
Any Class V permit issued under Chapters 9 or 16, Water
				  Quality Rules and Regulations, prior to the effective date of these regulations
				  shall remain in effect until replaced by an individual permit, a general permit
				  or permit by rule pursuant to this chapter. Existing individual permits issued
				  under Chapters 9 or 16 will be reviewed on a five (5) year basis pursuant to
				  Section 6(c)
				  of this chapter. Any individual permit issued pursuant to Chapters 9 or 16
				  prior to the effective date of these regulations fulfills all of the
				  requirements to obtain a permit under this chapter.
(a) All operators of existing systems which
				are required to obtain an individual permit under these regulations shall
				obtain a permit by April 14, 2000.
(b) General permits
(i) Within two (2) years of the effective
				date of the general permit, all operators of existing facilities which require
				coverage shall:
(A) Apply for coverage under
				the general permit.
(B) Apply for
				an individual permit for the facility.
(C) Retain an existing permit issued under
				Chapter 9.
(D) Cease discharging
				fluids to the subsurface.
Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 27 - UNDERGROUND INJECTION CONTROL PROGRAM CLASS I AND V WELLS › Section 27-5 - Control of Class I well subsurface discharges; permit required; aquifer exemptions

Current through July 13, 2024
(a) Class I wells
				shall be allowed only pursuant to the Wyoming Environmental Quality Act,
				Chapter 8, Wyoming Water Quality Rules and Regulations, and this
				chapter.
(b) Discharges into or
				construction of Class I wells are prohibited unless a permit has been obtained
				from the Department of Environmental Quality through the Water Quality
				Division.
(c) Injections from Class
				I wells shall be restricted to those receivers defined as Class VI groundwaters
				by the department pursuant to Chapter 8, Quality Standards for Wyoming
				Groundwaters, Water Quality Rules and Regulations and receivers which have
				obtained an aquifer exemption pursuant to this section.
(d) Permits may be issued for individual
				wells or on an area basis except Class I hazardous waste wells, which shall
				have individual permits.
(e) The
				procedure for obtaining an aquifer exemption from the U.S. Environmental
				Protection Agency shall be as follows:
(i)
				Water Quality Division shall submit one complete copy of the application, the
				Draft Permit, and the public notice to the U.S. Environmental Protection
				Agency, Region 8. This submission shall be made so that EPA receives the
				complete application at least twenty (20) days prior to the scheduled start of
				the public comment period.
(ii)
				When the aquifer exemption request is for an aquifer containing 3,000 mg/L or
				more of total dissolved solids, the following procedure shall be used: Within
				forty five (45) days of EPA receipt of a complete aquifer exemption request,
				EPA shall provide the department a written interim determination of intention
				to issue or deny the aquifer exemption pending receipt and review of the
				results of the public participation process conducted by the department. The
				interim response will become final if there are no comments relating to the
				aquifer exemption request during the comment or hearing process. If comments
				are received during the public comment or hearing process, the interim response
				will become final if not modified by EPA in writing within thirty (30) days of
				receipt of all comments.
(iii) An
				aquifer exemption request for an aquifer containing less than 3,000 mg/L of
				total dissolved solids requires the aquifer exemption request to be processed
				as a program revision pursuant to
				40 CFR
				145.32.