reglab/statecodes huggingface dataset:
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.510 - FACILITY AND DESIGN STANDARDS: SITING AND CONSTRUCTION OF WELLS

Current through August 31, 2023
Written approval by the Department is required before water
				from any new or reconstructed well may be served to the public. Any supplier of
				water for a public water system served by one (1) or more wells shall ensure
				that the following requirements are met: (3-24-22)
01.
Site Approval
. Prior to
			 drilling, the site of a public water system well must be approved in writing by
			 the Department. The Department shall require the supplier of water to submit a
			 well site evaluation report that takes into account the proposed size, depth,
			 and location of the well. The evaluation may include, but is not limited to the
			 following types of information: (3-24-22)
a.
			 An evaluation of the quality of anticipated ground water. (3-24-22)
b. Identification of the known aquifers and
			 the extent of each aquifer, based on the stratigraphy, sedimentation, and
			 geologic structure beneath the proposed well site. (3-24-22)
c. An estimate of hydrologic and geologic
			 properties of each aquifer and confining layers. (3-24-22)
d. Prediction of the sources of water to be
			 extracted by the well and the drawdown of existing wells, springs, and surface
			 water bodies that may be caused by pumping the proposed well. This prediction
			 may be based on analytical or numerical models as determined by the Idaho
			 Department of Water Resources permitting process. (3-24-22)
e. Demonstration of the extent of the capture
			 zone of the well, based on the well's design discharge and on aquifer geology,
			 using estimates of hydraulic conductivity and storativity. (3-24-22)
f. Description of potential sources of
			 contamination within five hundred (500) feet of the well site.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.511 - FACILITY AND DESIGN STANDARDS: WELL PUMPS, DISCHARGE PIPING, AND APPURTENANCES

Current through August 31, 2023
01.
Sample
			 Tap Required
. A sample tap suitable for collecting bacteriological
			 samples shall be provided on the discharge piping from every well at a point
			 where pressure is maintained but prior to any treatment. This sample tap shall
			 be of the smooth-nosed type without interior or exterior threads, shall not be
			 of the mixing or petcock type, and shall not have a screen, aerator, or other
			 such appurtenance. The sample tap for collecting bacteriological samples may be
			 used for other sampling purposes. In addition, threaded hose bib taps may also
			 be used for collecting samples, other than bacteriological samples, if equipped
			 with an appropriate backflow prevention device as may be necessary to protect
			 the public water system from contamination. (3-24-22)
02.
Discharge Piping
. The
			 discharge line shall be equipped with the necessary valves and appurtenances to
			 allow a well to be pumped to waste at the design capacity of the well via an
			 approved air gap through an approved non-corrodible screen at a location prior
			 to the first service connection, and shall meet the following requirements:
			 (3-24-22)
a. Be designed to minimize friction
			 loss. (3-24-22)
b. Have control
			 valves and appurtenances located above the pump house floor when an
			 above-ground discharge is provided. (3-24-22)
c. Be protected against contamination.
			 (3-24-22)
d. Vertical turbine pumps
			 shall be equipped with an air release-vacuum relief valve, or equivalent,
			 located upstream from the check valve, with exhaust/relief piping terminating
			 in a down-turned position at least eighteen (18) inches above the floor and
			 covered with a twenty-four (24) mesh corrosion resistant screen.
			 (3-24-22)
e. Have all exposed
			 piping, valves and appurtenances protected against physical damage and
			 freezing. (3-24-22)
f. Be properly
			 anchored to prevent movement, and protected against surge or water hammer.
			 (3-24-22)
g. The pump to waste
			 discharge piping shall be valved to ensure that other system components that
			 could be negatively affected by the quality of the discharged water are not
			 pressurized by the water that is being pumped to waste. (3-24-22)
h. Where two (2) or more wells are connected
			 to a common well house, the discharge piping shall be designed to ensure that
			 each well can be pumped to waste independently without affecting the ability of
			 the other well or wells to pressurize the system. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.512 - FACILITY AND DESIGN STANDARDS: WELL LOT

Current through August 31, 2023
A well lot shall be provided for wells constructed after
				November 1, 1977. The well lot shall be owned in fee simple by the supplier of
				water or controlled by lease or easement with a term of not less than the
				useful life of the well and be large enough to provide a minimum distance of
				fifty (50) feet between the well and the nearest property line.
				(3-24-22)
01.
Use of Chemicals
			 on the Well Lot
. No pesticides, herbicides, or fertilizers shall be
			 applied to a well lot without prior approval from the Department.
			 (3-24-22)
02.
Storage of
			 Hazardous Materials on the Well Lot
. No pesticides, herbicides,
			 fertilizers, portable containers of petroleum products, or other materials
			 known to be toxic or hazardous shall be stored on a well lot, except that:
			 (3-24-22)
a. An internal combustion engine to
			 drive either a generator for emergency standby power or a pump to provide fire
			 flows, and an associated fuel tank, may be placed on the well lot.
			 (3-24-22)
b. A propane or natural
			 gas powered generator is preferable to reduce risk of fuel spillage.
			 (3-24-22)
c. If a diesel or
			 gasoline-fueled engine is used, the fuel tank and connecting piping must be
			 approved by the Underwriter's Laboratory, Inc., double-walled, meet the
			 requirements of the local fire jurisdiction, and include both spill prevention
			 and overfill protection features. The tank must be above ground and may be
			 contained within the structural base of the generator unit. A licensed water
			 system operator shall be present during filling of the tank following a period
			 of usage, or during periodic extraction and replacement of outdated fuel.
			 (3-24-22)
d. Should the internal
			 combustion engine be located within the pump house, the floor of the pump house
			 shall be constructed so as to contain all petroleum drips and spills so that
			 they will not be able to reach the floor drain(s). Engine exhaust shall be
			 directly discharged outside the pump house. (3-24-22)
e. A spill containment structure shall
			 surround all fuel tanks and be sized to contain at least one hundred ten
			 percent (110%) of the fuel tank volume. The Department may require additional
			 containment capacity in settings where accumulation of snow, ice, or rain water
			 could be expected to diminish the usable capacity of the structure.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.513 - FACILITY AND DESIGN STANDARDS: NUMBER OF GROUND WATER SOURCES REQUIRED - EXISTING SYSTEMS

Current through August 31, 2023
Existing community water systems served by ground water and
				intending to serve more than twenty-five (25) connections or equivalent
				dwelling units are subject to the following requirements for the number of
				ground water sources required. (3-24-22)
01.
Existing System with All Sources
			 Constructed Prior to July 1, 1985
. A community water system served by
			 ground water and with all existing sources constructed prior to July 1, 1985
			 will be required to comply with Subsection
			 501.17 upon substantially
			 modifying the system after July 2002. (3-24-22)
02.
Existing System with Any Sources
			 Constructed After July 1, 1985
. A community water system served by
			 ground water with any sources constructed after July 1, 1985 is required to
			 comply with Subsection
			 501.17 when a modification is
			 made to the system which increases the population served or number of service
			 connections, increases the length of transmission and distribution water mains,
			 or increases the peak or average water demand. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.514 - FACILITY AND DESIGN STANDARDS: SPRING SOURCES

Current through August 31, 2023
Written approval by the Department is required before water
				from any new or reconstructed spring source may be served to the public. For
				new spring sources, the Department shall require a site evaluation report
				containing applicable required information listed in Subsection
				510.01. This information
				includes, but is not limited to, the following: an evaluation of the potability
				and quality of anticipated spring water; an estimate of hydrologic and geologic
				properties of the aquifer; and a description of potential sources of
				contamination within five hundred (500) feet of the spring. Any supplier of
				water for a public water system served by one (1) or more springs shall ensure
				that the following requirements are met: (3-24-22)
01.
Protection of the Spring
.
			 Springs shall be housed in a permanent structure and protected from
			 contamination including the entry of surface water, animals, and dust.
			 (3-24-22)
02.
Spring Box or
			 Combined Spring Box/Finished Water Storage Design
. To facilitate
			 efficient design and review of spring box or combined spring box/finished water
			 storage designs, these site-specific designs should be coordinated in advance
			 with the Department. Specific issues to be addressed are: (3-24-22)
a. The inlet shall be screened as determined
			 by the Department and located above the floor of the collection chamber.
			 (3-24-22)
b. Unless otherwise
			 approved by the Department based on documentation provided by the design
			 engineer, the spring box or combined spring box/finished water storage tank
			 shall meet the applicable design requirements of Section
			 544 - Facility and Design
			 Standards: General Design of Finished Water Storage.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.515 - FACILITY AND DESIGN STANDARDS: SURFACE SOURCES AND GROUND WATER SOURCES UNDER THE DIRECT INFLUENCE OF SURFACE WATER

Current through August 31, 2023
Written approval by the Department is required before water
				from any new surface source or ground water source that is under the direct
				influence of surface water may be served to the public. Infiltration collection
				lines or galleries are considered ground water under the direct influence of
				surface water unless demonstrated otherwise. Infiltration galleries that are
				not directly influenced by surface water shall meet the requirements of Section
				514. The area around infiltration
				lines shall be under the control of the water purveyor for a distance
				acceptable to the Department. (3-24-22)
01.
Intake Structures
. Design of
			 intake structures shall provide for: (3-24-22)
a. Withdrawal of water from more than one (1)
			 level if quality varies with depth. (3-24-22)
b. Separate facilities for release of less
			 desirable water held in storage. (3-24-22)
c. Where frazil ice may be a problem, holding
			 the velocity of flow into the intake structure to a minimum, generally not to
			 exceed point five (0.5) feet per second. Frazil ice is made up of randomly
			 distributed ice crystals that are formed in flowing water that has cooled below
			 thirty-two (32) degrees Fahrenheit and is prevented from forming into ice
			 sheets by the movement of the water. (3-24-22)
d. Inspection manholes every one thousand
			 (1000) feet for pipe sizes large enough to permit visual inspection.
			 (3-24-22)
e. Cleaning the intake
			 line as needed. (3-24-22)
f.
			 Adequate protection against rupture by dragging anchors, ice, or other hazards.
			 (3-24-22)
g. Ports located above
			 the bottom of the stream, lake or impoundment, but at sufficient depth to be
			 kept submerged at low water levels. (3-24-22)
h. Where shore wells are not provided, a
			 diversion device capable of keeping large quantities of fish or debris from
			 entering an intake structure. (3-24-22)
i. If necessary, provisions shall be made in
			 the intake structure to control the influx of nuisance aquatic organisms.
			 Specific control methods must be approved by the reviewing authority.
			 (3-24-22)
j. When buried surface
			 water collectors are used, sufficient intake opening area must be provided to
			 minimize inlet headloss. Particular attention shall be given to the selection
			 of backfill material in relation to the collector pipe slot size and gradation
			 of the native material over the collector system. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.518 - FACILITY AND DESIGN STANDARDS: ADDITIONAL DESIGN CRITERIA FOR SURFACE WATER TREATMENT

Current through August 31, 2023
Performance criteria for surface water treatment facilities are
				specified in National Primary Drinking Water Regulations, as set forth in
				Sections 300,
				301, and
				310 of these rules. Surface water
				treatment systems must comply with applicable general design requirements in
				Section 503. In
				addition, the following design requirements apply specifically to surface water
				treatment facilities: (3-24-22)
01.
Engineering Design Requirements
. The system shall ensure that
			 filtration and disinfection facilities for surface water or ground water
			 directly influenced by surface water sources are designed, constructed and
			 operated in accordance with all applicable engineering practices designated by
			 the Department. The design of the water treatment plant must consider the worst
			 raw water quality conditions that are likely to occur during the life of the
			 facility. (3-24-22)
02.
Removal of Pathogens
. Filtration facilities (excluding
			 disinfection) shall be designed, constructed and operated to achieve at least
			 two (2) log removal of Giardia lamblia cysts, two (2) log removal of
			 Cryptosporidium oocysts, and one (1) log removal of viruses, except as allowed
			 under Subsection 518.09.b. (3-24-22)
03.
Disinfection
. Disinfection
			 facilities shall be designed, constructed and operated so as to achieve at
			 least point five zero (0.50) log inactivation of Giardia lamblia cysts; and
			 (3-24-22)
a. Two (2) log inactivation of
			 viruses if using conventional and slow sand filtration technology; or
			 (3-24-22)
b. Three (3) log
			 inactivation of viruses if using direct and diatomaceous earth filtration
			 technology; or (3-24-22)
c. Four
			 (4) log inactivation of viruses if using alternate filtration technology.
			 (3-24-22)
d. Four (4) log
			 inactivation of viruses if filtration treatment is not used.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.519 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT; DESIGN STANDARDS FOR MICROSCREENING

Current through August 31, 2023
A microscreen may be used to reduce nuisance organisms and
				organic loadings. It shall not be used in place of filtration or coagulation in
				the preparation of water for filtration. (3-24-22)
01.
Design Considerations
. The
			 following shall be taken into account during design: (3-24-22)
a. The nature of the suspended matter to be
			 removed. (3-24-22)
b. The
			 corrosiveness of the water. (3-24-22)
c. The effect of chlorination, when required
			 as pre-treatment. (3-24-22)
d. The
			 duplication of units for continuous operation during equipment maintenance.
			 (3-24-22)
e. Automated backflushing
			 operation when used in conjunction with microfiltration treatment.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.520 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT: CLARIFICATION PROCESSES

Current through August 31, 2023
Treatment facilities designed to include clarification for
				processing surface water shall meet the following requirements:
				(3-24-22)
01.
Two Units
			 Required
. A minimum of two (2) units for redundancy shall be provided
			 for flocculation and sedimentation such that plant design capacity can be
			 maintained with any component out of service for maintenance or repairs.
			 (3-24-22)
02.
Parallel or
			 Serial Operation
. The units shall be capable of being operated either in
			 series or parallel where softening is performed. (3-24-22)
03.
Independent Units
. The units
			 shall be constructed in such a way that each can be taken out of service
			 without disrupting operation, and with drains or pumps sized to allow
			 dewatering in a reasonable period of time. (3-24-22)
04.
Manual Start-Up
. The units
			 shall be started manually following shutdown. (3-24-22)
05.
Pre-Treatment
. Waters
			 exhibiting high turbidity may require pretreatment, usually sedimentation with
			 or without the addition of coagulation chemicals. When presedimentation is
			 provided, the following requirements must be met: (3-24-22)
a. Incoming water shall be dispersed across
			 the full width of the line of travel as quickly as possible. Short circuiting
			 must be prevented. (3-24-22)
b.
			 Provisions for bypassing pre-sedimentation basins shall be included.
			 (3-24-22)
c. The need for redundant
			 pretreatment components shall be evaluated according to the type and necessity
			 of the pretreatment. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.521 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT: FILTRATION USING RAPID RATE GRAVITY FILTERS

Current through August 31, 2023
01.
Pretreatment
. The use of rapid rate gravity filters shall require
			 pretreatment in the form of coagulation, flocculation, and sedimentation.
			 (3-24-22)
02.
Rate of
			 Filtration
. The filter rate must be proposed and justified by the design
			 engineer to the satisfaction of the Department prior to the preparation of
			 final plans and specifications. (3-24-22)
03.
Number of Units
. A minimum
			 of two (2) units for redundancy shall be provided for filtration such that
			 plant design capacity can be maintained with any component out of service for
			 maintenance or repairs. Where declining rate filtration is provided, the
			 variable aspect of filtration rates, and the number of filters must be
			 considered when determining the design capacity for the filters.
			 (3-24-22)
04.
Structure and
			 Hydraulics
. The filter structure shall be designed to provide for:
			 (3-24-22)
a. Vertical walls within the filter.
			 There shall be no protrusion of the filter walls into the filter media.
			 (3-24-22)
b. Cover by
			 superstructure with sufficient headroom to permit normal inspection and
			 operation. (3-24-22)
c. Minimum
			 depth of filter box of eight and one-half (8.5) feet. (3-24-22)
d. Minimum water depth over the surface of
			 the filter media of three (3) feet. (3-24-22)
e. Trapped effluent to prevent backflow of
			 air to the bottom of the filters. (3-24-22)
f. Prevention of floor drainage to the filter
			 with a minimum four (4) inch curb around the filters. (3-24-22)
g. Prevention of flooding by providing
			 overflow. (3-24-22)
h. Maximum
			 velocity of treated water entering the filters of two (2) feet per second.
			 (3-24-22)
i. Cleanouts and straight
			 alignment for influent pipes or conduits where solids loading is heavy, or
			 following lime-soda softening. (3-24-22)
j. Washwater drain capacity to carry maximum
			 flow. (3-24-22)
k. Walkways around
			 filters to be not less than twenty-four (24) inches wide and equipped with
			 safety handrails or walls. (3-24-22)
l. Construction so as to prevent cross
			 connections and common walls between potable water and non-potable fluids.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.522 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT: FILTRATION USING DIATOMACEOUS EARTH

Current through August 31, 2023
The use of these filters may be considered for application to
				surface waters with low turbidity and low bacterial contamination, and may be
				used for iron removal for ground waters providing the removal is effective and
				the water is of satisfactory sanitary quality before treatment.
				(3-24-22)
01.
Conditions of
			 Use
. Diatomaceous earth filters are expressly excluded from
			 consideration for the following conditions: (3-24-22)
a. Bacteria removal; (3-24-22)
b. Color removal; (3-24-22)
c. Turbidity removal where either the gross
			 quantity of turbidity is high or the turbidity exhibits poor filterability
			 characteristics; or (3-24-22)
d.
			 Filtration of waters with high algae counts. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.524 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT: DIRECT FILTRATION

Current through August 31, 2023
Direct filtration, as used herein, refers to the filtration of
				a surface water following chemical coagulation and possibly flocculation but
				without prior settling. The nature of the treatment process will depend upon
				the raw water quality. A full scale direct filtration plant shall not be
				constructed without prior pilot studies which are acceptable to the reviewing
				authority. In-plant demonstration studies are required where conventional
				treatment plants are converted to direct filtration. Where direct filtration is
				proposed, an engineering report shall be submitted prior to conducting pilot
				plant or in-plant demonstration studies. See Subsection
				501.19 for general information
				on conducting pilot studies. (3-24-22)
01.
Filtration Requirements
.
			 (3-24-22)
a. Filters shall be rapid rate
			 gravity filters with dual or mixed media. The final filter design shall be
			 based on the pilot plant or in-plant demonstration studies, and all portions of
			 Section 518 apply.
			 Pressure filters or single media sand filters shall not be used.
			 (3-24-22)
b. A continuous recording
			 turbidimeter shall be installed on each filter effluent line and on the
			 composite filter effluent line. (3-24-22)
c. Additional continuous monitoring equipment
			 such as particle counting or streaming current metering to assist in control of
			 coagulant dose may be required by the reviewing authority.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.529 - FACILITY AND DESIGN STANDARDS: DISINFECTION OF DRINKING WATER, ULTRAVIOLET LIGHT

Current through August 31, 2023
01.
General
. (3-24-22)
a. Ultraviolet
			 (UV) light technology is a primary disinfectant typically used for
			 Cryptosporidium, Giardia lamblia, and virus inactivation of both surface water
			 and ground water supplies. Reactor performance in terms of inactivation of any
			 particular organism is a function of the delivered dose which is determined by
			 validation testing. (3-24-22)
b. UV
			 disinfection credit will be awarded for filtered systems and unfiltered systems
			 if the system meets the requirements for unfiltered systems in
			 40 CFR
			 141.71. Systems will receive Cryptosporidium,
			 Giardia lamblia, and virus treatment credits by achieving the corresponding UV
			 dose values for the appropriate target pathogen and log reduction shown in
			 Subsection 529.03, calculated to take into
			 account the validation factor and reduction equivalent dose. The target
			 pathogen and the target log inactivation shall be used to identify the
			 corresponding required UV dose. (3-24-22)
c. For water systems using UV light to meet
			 microbial treatment requirements, at least ninety-five percent (95%) of the
			 water delivered to the public every month must be treated by UV reactors
			 operating within validated conditions for the required UV dose.
			 (3-24-22)
d. When reviewing
			 proposed UV disinfection projects, the Department will use the USEPA UV
			 Disinfection Guidance Manual for the Final Long Term 2 Enhanced Surface Water
			 Treatment Rule referenced in Subsection
			 002.02 (UV Disinfection Guidance
			 Manual) for guidance. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.530 - FACILITY AND DESIGN STANDARDS: DISINFECTION OF DRINKING WATER, DISINFECTING AGENTS

Current through August 31, 2023
Disinfection may be accomplished with gas and liquid chlorine,
				calcium or sodium hypochlorites, chlorine dioxide, ozone, or ultraviolet light.
				Other disinfecting agents will be considered, providing reliable application
				equipment is available and testing procedures for a residual are recognized in
				"Standard Methods for the Examination of Water and Wastewater," referenced in
				Subsection 002.02, or an equivalent means
				of measuring effectiveness exists. The required amount of primary disinfection
				needed shall be specified by the Department. Consideration must be given to the
				formation of disinfection by-products (DBP) when selecting the disinfectant.
				See Section 531, Facility Design Standards -
				Design Standards for Chemical Application. For public water systems using only
				ground water and that voluntarily chlorinate, see Subsection
				552.04. (3-24-22)
01.
Chlorination
. (3-24-22)
a. In addition to the requirements of Section
			 531, chlorination equipment shall
			 meet the following requirements: (3-24-22)
i.
			 Solution-feed gas chlorinators or hypochlorite feeders of the positive
			 displacement type must be provided. (3-24-22)
ii. Standby or backup equipment of sufficient
			 capacity shall be available to replace the largest unit. Spare parts shall be
			 on hand to replace parts subject to wear and breakage. (3-24-22)
iii. Automatic proportioning chlorinators are
			 required where the rate of flow or chlorine demand is not reasonably constant.
			 (3-24-22)
iv. Each eductor
			 (submerged jet pump) must be selected for the point of application with
			 particular attention given to the quantity of chlorine to be added, the maximum
			 injector waterflow, the total discharge back pressure, the injector operating
			 pressure, and the size of the chlorine solution line. (3-24-22)
v. The chlorine solution injector/diffuser
			 must be compatible with the point of application to provide a rapid and
			 thorough mix with all the water being treated. (3-24-22)
vi. Automatic switch-over of chlorination
			 treatment units shall be provided, where necessary, to assure continuous
			 disinfection. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.531 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR CHEMICAL APPLICATION

Current through August 31, 2023
01.
General Equipment Design
.
			 General equipment design shall be such that: (3-24-22)
a. Feeders will be able to supply, at all
			 times, the necessary amounts of chemicals at an accurate rate, throughout the
			 range of feed. (3-24-22)
b.
			 Chemical-contact materials and surfaces are resistant to the aggressiveness of
			 the chemical solution. (3-24-22)
c.
			 Corrosive chemicals are introduced in such a manner as to minimize potential
			 for corrosion. (3-24-22)
d.
			 Chemicals that are incompatible are not stored or handled together. At
			 facilities where more than one (1) chemical is stored or handled, tanks and
			 pipelines shall be clearly labeled to identify the chemical they contain.
			 (3-24-22)
e. All chemicals are
			 conducted from the feeder to the point of application in separate conduits.
			 (3-24-22)
f. Chemical feeders are
			 as near as practical to the feed point. (3-24-22)
g. Chemical feeders and pumps shall operate
			 at no lower than twenty percent (20%) of the feed range unless two fully
			 independent adjustment mechanisms such as pump pulse rate and stroke length are
			 fitted when the pump shall operate at no lower than ten percent (10%) of the
			 rated maximum. (3-24-22)
h. Spare
			 parts shall be on hand for parts of feeders that are subject to frequent wear
			 and damage. (3-24-22)
i. Redundant
			 chemical feeders with automatic switchover shall be provided when necessary to
			 ensure adequate treatment. If the water treatment system includes at least two
			 (2) process trains of equipment so that the plant design capacity can be
			 maintained with any component out of service, redundant chemical feeders are
			 not required on each process train. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.532 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR SOFTENING

Current through August 31, 2023
The softening process selected must be based upon the mineral
				qualities of the raw water and the desired finished water quality, in
				conjunction with requirements for disposal of sludge or brine waste (see
				Section 540), cost of
				plant, cost of chemicals, and plant location. Applicability of the process
				chosen shall be demonstrated. (3-24-22)
01.
Lime or Lime-Soda Process
.
			 Rapid mix, flocculation, and sedimentation processes shall meet the
			 requirements of Section
			 520. In addition the following
			 requirements must be met: (3-24-22)
a. When
			 split treatment is used, an accurate means of measuring and splitting the flow
			 must be provided. (3-24-22)
b.
			 Rapid mix basins must provide not more than thirty (30) seconds detention time
			 with adequate velocity gradients to keep the lime particles dispersed.
			 (3-24-22)
c. Equipment for
			 stabilization of water softened by the lime or lime-soda process is required,
			 see Section 537. (3-24-22)
d. Mechanical sludge removal equipment shall
			 be provided in the sedimentation basin. (3-24-22)
e. Provisions must be included for proper
			 disposal of softening sludges; see Section
			 540. (3-24-22)
f. The plant processes must be manually
			 started following shut-down. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.533 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR TASTE AND ODOR CONTROL

Current through August 31, 2023
Provision shall be made for the control of taste and odor.
				Chemicals shall be added sufficiently ahead of other treatment processes to
				assure adequate contact time for an effective and economical use of the
				chemicals. Where severe taste and odor problems are encountered, in-plant
				studies, pilot plant studies, or both in-plant and pilot plant studies may be
				required. See Subsection
				501.19 for general information
				on conducting pilot studies. (3-24-22)
01.
Chlorination
. When using
			 chlorination as a method of taste and odor control adequate contact time must
			 be provided to complete the chemical reactions involved. (3-24-22)
02.
Chlorine Dioxide
. Provisions
			 shall be made for proper storing and handling of the sodium chlorite, so as to
			 eliminate any danger of explosion. (3-24-22)
03.
Powdered Activated Carbon
.
			 (3-24-22)
a. The carbon can be added as a
			 pre-mixed slurry or by means of a dry-feed machine as long as the carbon is
			 properly wetted. (3-24-22)
b.
			 Continuous agitation or resuspension equipment is necessary to keep the carbon
			 from depositing in the slurry storage tank. (3-24-22)
c. Provision shall be made for adequate dust
			 control. (3-24-22)
d. Powdered
			 activated carbon shall be handled as a potentially combustible material.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.534 - FACILITY AND DESIGN STANDARDS: AERATION PROCESSES

Current through August 31, 2023
Public water systems that install aeration treatment are
				subject to the Rules of the Department of Environmental Quality, IDAPA
				58.01.01, "Rules for the Control of Air Pollution in Idaho." The system owner
				or the design engineer shall contact one of the Department's regional offices
				for information on obtaining a permit or an exemption for the emissions
				resulting from the aeration process. General information may be found on the
				DEQ website
http://www.deq.idaho.gov
.
				(3-24-22)
01.
Natural Draft
			 Aeration
. Design shall provide: (3-24-22)
a. Perforations in the distribution pan three
			 sixteenths to one-half (3/16 - ½) inches in diameter, spaced one to
			 three (1-3) inches on centers to maintain a six (6) inch water depth.
			 (3-24-22)
b. For distribution of
			 water uniformly over the top tray. (3-24-22)
c. Discharge through a series of three (3) or
			 more trays with separation of trays not less than twelve (12) inches.
			 (3-24-22)
d. Loading at a rate of
			 one to five (1-5) gallons per minute for each square foot of total tray area.
			 (3-24-22)
e. Trays with slotted,
			 heavy wire (1/2 inch openings) mesh or perforated bottoms. (3-24-22)
f. Construction of durable material resistant
			 to aggressiveness of the water and dissolved gases. (3-24-22)
g. Protection from insects by twenty-four
			 (24) mesh or similar non-corrodible screen. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.536 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR FLUORIDATION

Current through August 31, 2023
01.
Chemical Feed Equipment and
			 Methods
. In addition to the requirements in Section
			 531, fluoride feed equipment shall
			 meet the following requirements: (3-24-22)
a.
			 Scales, loss-of-weight recorders or liquid level indicators, as appropriate,
			 accurate to within five (5) percent of the average daily change in reading
			 shall be provided for chemical feeds. (3-24-22)
b. The accuracy of chemical feeders used for
			 fluoridation shall be plus or minus five (5) percent of the intended dose.
			 (3-24-22)
c. Unsealed storage units
			 for fluorosilicic acid shall be vented to the atmosphere at a point outside any
			 building. (3-24-22)
d. Fluoride
			 compound shall not be added before lime-soda softening or ion exchange
			 softening. (3-24-22)
e. The point
			 of application of fluorosilicic acid, if into a horizontal pipe, shall be in
			 the lower half of the pipe. (3-24-22)
f. A fluoride solution shall be applied by a
			 positive displacement pump having a stroke rate not less than twenty (20)
			 strokes per minute, and at a feed rate not less than twenty (20) percent of the
			 rated capacity of the feed pump. (3-24-22)
g. A spring opposed diaphragm type
			 anti-siphon device shall be provided for all fluoride feed lines and dilution
			 water lines. (3-24-22)
h. Except
			 for constant flow systems, a device to measure the flow of water to be treated
			 is required. (3-24-22)
i. The
			 dilution water pipe shall terminate at least two (2) pipe diameters above the
			 solution tank. (3-24-22)
j. Water
			 used for sodium fluoride dissolution shall be softened if hardness exceeds
			 seventy-five (75) mg/l as calcium carbonate. (3-24-22)
k. Fluoride solutions shall be injected at a
			 point of continuous positive pressure or a suitable air gap provided.
			 (3-24-22)
l. The electrical outlet
			 used for the fluoride feed pump shall be interconnected with the well or
			 service pump. (3-24-22)
m.
			 Consideration shall be given to providing a separate room for fluorosilicic
			 acid storage and feed. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.537 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR STABILIZATION

Current through August 31, 2023
Water that is unstable due either to natural causes or to
				subsequent treatment shall be stabilized. The expected treated water quality
				shall be evaluated to determine what, if any, treatment is necessary.
				(3-24-22)
01.
Carbon Dioxide
			 Addition
. (3-24-22)
a. Recarbonation
			 basin design shall provide the following: (3-24-22)
i. A total detention time of twenty (20)
			 minutes. (3-24-22)
ii. A mixing
			 compartment having a detention time of at least three (3) minutes.
			 (3-24-22)
iii. A reaction
			 compartment. (3-24-22)
iv. The
			 mixing and reaction compartments shall have a depth sufficient to provide a
			 diffuser submergence of not less than seven and one-half (7.5) feet and no
			 greater than the manufacturer's recommendation. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.540 - FACILITY AND DESIGN STANDARDS: DESIGN STANDARDS FOR TREATMENT AND DISPOSAL OF TREATMENT PLANT WASTE RESIDUALS

Current through August 31, 2023
Provisions must be made for proper disposal of water treatment
				plant waste such as sanitary, laboratory, clarification sludge, softening
				sludge, iron sludge, filter backwash water, and liquid concentrates. In
				locating waste disposal facilities, due consideration shall be given to
				preventing potential contamination of the water supply. (3-24-22)
01.
Sanitary Waste
. The sanitary
			 waste from water treatment plants, pumping stations, and other waterworks
			 installations must receive treatment. Waste from these facilities shall be
			 discharged directly to a sanitary sewer system, when available and feasible, or
			 to an adequate on-site waste treatment facility approved under the provisions
			 of IDAPA 58.01.03, "Individual/Subsurface Sewage Disposal Rules."
			 (3-24-22)
02.
Liquid
			 Concentrates
. (3-24-22)
a. Waste from
			 ion exchange plants, demineralization plants, reverse osmosis, on-site chlorine
			 generators, or other plants which produce liquid concentrates may be disposed
			 of by the following methods: (3-24-22)
i.
			 Liquid concentrates that contain radionuclides must be further treated to
			 remove the radioactive constituents as sludge. See Subsection
			 540.03.e. for disposal
			 requirements for sludge that contains radionuclides. The residual liquids from
			 which radionuclides have been removed may be disposed of in accordance with
			 Subsections 540.02.a.ii. through
			 540.02.a.iv. (3-24-22)
ii.
			 Controlled discharge to a stream or other receiving water body if adequate
			 dilution is available. Such discharge will require a National Pollution
			 Elimination System Permit from the U.S. Environmental Protection Agency, Region
			 10, 1200 Sixth Avenue, Seattle, WA 98101, Telephone (206) 553-1200.
			 (3-24-22)
iii. Liquid concentrates
			 may be discharged to a sanitary sewer, if available and feasible. Acceptance of
			 such waste must be approved by the sewer authority. (3-24-22)
iv. Subsurface disposal or land application
			 of liquid concentrates may be permitted, but only if such discharge meets the
			 requirements of IDAPA 58.01.03, "Individual/Subsurface Sewage Disposal Rules"
			 for subsurface disposal or the requirements of IDAPA 58.01.17, "Recycled Water
			 Rules" for land application. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.542 - FACILITY AND DESIGN STANDARDS - DISTRIBUTION SYSTEM

Current through August 31, 2023
01.
Protection from
			 Contamination
. The distribution system shall be protected from
			 contamination and be designed to prevent contamination by steam condensate or
			 cooling water from engine jackets or other heat exchange devices.
			 (3-24-22)
02.
Installation of
			 Water Mains
. Division 400 of "Idaho Standards for Public Works
			 Construction," referenced in Subsection
			 002.02, may be used as guidance
			 for installation of water mains. In addition, the following provisions shall
			 apply: (3-24-22)
a. Installed pipe shall be
			 pressure tested and leakage tested in accordance with the applicable AWWA
			 Standards, incorporated by reference into these rules at Subsection
			 002.01. (3-24-22)
b. New, cleaned, and repaired water mains
			 shall be disinfected in accordance with AWWA Standard C651, incorporated by
			 reference into these rules at Subsection
			 002.01. The specifications shall
			 include detailed procedures for the adequate flushing, disinfection, and
			 microbiological testing of all water mains. (3-24-22)
c. In areas where aggressive soil conditions
			 are suspected or known to exist, analyses shall be performed to determine the
			 actual aggressiveness of the soil. If soils are found to be aggressive, action
			 shall be taken to protect metallic joint restraints and the water main, such as
			 encasement in polyethylene, provision of cathodic protection, or use of
			 corrosion resistant materials. (3-24-22)
d. The Department must approve any
			 interconnection between potable water supplies, taking into account differences
			 in water quality between the two systems. (3-24-22)
e. A continuous and uniform bedding shall be
			 provided in the trench for all buried pipe. Backfill material shall be tamped
			 in layers around the pipe and to a sufficient height above the pipe to
			 adequately support and protect the pipe. Stones found in the trench shall be
			 removed for a depth of at least six (6) inches below the bottom of the pipe.
			 (3-24-22)
f. Water mains shall be
			 covered with sufficient earth or other insulation to prevent freezing.
			 (3-24-22)
g. All tees, bends, plugs
			 and hydrants shall be provided with reaction blocking, tie rods or joints
			 designed to prevent movement. (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.543 - FACILITY AND DESIGN STANDARDS: CROSS CONNECTION CONTROL

Current through August 31, 2023
There shall be no connection between the distribution system
				and any pipes, pumps, hydrants, water loading stations, or tanks whereby unsafe
				water or other contaminating materials may be discharged or drawn into a public
				water system. The water purveyor is responsible through its cross connection
				control program to take reasonable and prudent measures to protect the water
				system against contamination and pollution from cross connections through
				premises isolation or containment, internal or in-plant isolation, fixture
				protection, or some combination of premises isolation, internal isolation, and
				fixture protection. (3-24-22)
01.
Testable Assemblies
. All double check valve backflow prevention
			 assemblies, reduced pressure principle backflow prevention assemblies, spill
			 resistant vacuum breakers, and pressure vacuum breakers used must pass a
			 performance test conducted by the University of Southern California Foundation
			 for Cross-Connection Control and Hydraulic Research (USC Foundation) and be
			 included on the USC Foundation "List of Approved Assemblies."
			 (3-24-22)
02.
Atmospheric
			 Vacuum Breakers
. All atmospheric vacuum breakers used shall be marked
			 approved either by the International Association of Plumbing and Mechanical
			 Officials (IAPMO) or by the American Society of Sanitation Engineers (ASSE).
			 (3-24-22)
03.
Replacement
			 Parts and Components
. All replacement parts and components, including
			 resilient seated shutoff valves, shall meet original manufacturer's
			 specifications or otherwise be approved by the USC Foundation as replacement
			 parts or components for use on double check valve backflow prevention
			 assemblies, reduced pressure principle backflow prevention assemblies, pressure
			 vacuum breakers, and spill resistant pressure vacuum breakers. The design,
			 material, or operational characteristics of any assembly must not be altered
			 during maintenance or repair. (3-24-22)
04.
Assembly Selection
.
			 Appropriate and adequate backflow prevention assembly types for various
			 facilities, fixtures, equipment, and uses of water should be selected from the
			 AWWA Pacific Northwest Section Cross Connection Control Manual, the Uniform
			 Plumbing Code, the AWWA Recommended Practice for Backflow Prevention and Cross
			 Connection Control (M14), the USC Foundation Manual of Cross Connection
			 Control, or other sources deemed acceptable by the Department. The selected
			 assembly manufacturer model number must be included on the USC Foundation "List
			 of Approved Assemblies" and must comply with local ordinances.
			 (3-24-22)
Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.544 - FACILITY AND DESIGN STANDARDS: GENERAL DESIGN OF FINISHED WATER STORAGE

Current through August 31, 2023
The materials and designs used for finished water storage
				structures shall provide stability and durability as well as protect the
				quality of the stored water. Finished water storage structures shall be
				designed to maintain water circulation and prevent water stagnation. Steel
				structures and facilities such as steel tanks, standpipes, reservoirs, and
				elevated tanks shall be designed and constructed in accordance with applicable
				AWWA Standards, incorporated by reference into these rules at Subsection
				002.01. Other materials of
				construction are acceptable when properly designed to meet the requirements of
				Section 544.
				(3-24-22)
01.
Sizing and
			 Isolation Requirements
. (3-24-22)
a.
			 Storage facilities shall have sufficient capacity, as determined from
			 engineering studies that consider peak flows, fire flow capacity, and analysis
			 of the need for various components of finished storage as defined under the
			 term "Components of Finished Water Storage" in Section
			 003. The requirement for storage
			 may be reduced when the source and treatment facilities have sufficient
			 capacity with standby power to supply peak demands of the system.
			 (3-24-22)
b. All storage structures
			 which provide pressure directly to the distribution system, such as elevated
			 storage structures or ground level storage structures with associated pumping
			 systems, shall be designed so they can be isolated and drained for cleaning or
			 maintenance without causing a loss of pressure in the distribution system.
			 (3-24-22)