reglab/statecodes huggingface dataset:
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-565 - Source water protection

Current through Register Vol. 40, No. 24, July 15, 2024
A. A
				waterworks owned by a county, city, or town may exercise the authority pursuant
				to §
									15.2-2109
				of the Code of Virginia to protect the waterworks from pollution or
				injury.
B. The owner of a
				waterworks with a drinking water reservoir may establish a buffer around the
				intake to limit such uses as body contact recreation and boats powered by
				engines, pursuant to a plan acceptable to the department.
C. The owner of a waterworks should develop a
				source water protection plan for all the sources and report ongoing or
				completed protection initiatives to the department.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-580 - General requirements for cross-connection control and backflow prevention

Current through Register Vol. 40, No. 24, July 15, 2024
A. Every
				owner shall establish and enforce a cross-connection control program (CCCP) in
				accordance with
				12VAC5-590-360.
				The goal of the CCCP is to prevent the intrusion of contamination into the
				distribution system via cross-connections and backflow. The owner shall
				document the CCCP activities in a cross-connection control plan and submit the
				written document to the department for review and approval.
B. No owner shall install, maintain, or allow
				a service connection to any premises where cross-connections to a waterworks or
				a consumer's water system exist, unless the owner and department ensure the
				cross-connections are adequately safeguarded.
C. No owner shall install, maintain, or allow
				any connection whereby water from an auxiliary water system may enter a
				waterworks or consumer's water system, unless the owner and department approve
				the auxiliary water system, the method of connection, and use of such
				system.
D. The owner, in accordance
				with
				12VAC5-590-510
				C, shall maintain acceptable working pressures in the distribution system to
				reduce the potential for backflow to occur.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-590

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-600 - Cross-connection control program responsibilities

Current through Register Vol. 40, No. 24, July 15, 2024
A. The owner shall establish and implement a
				CCCP consistent with the extent of the distribution system and the consumers
				served by the waterworks. The owner shall review the CCCP and written
				cross-connection control plan not less than every five years and update it as
				necessary to satisfy the requirements of this chapter. The owner shall submit
				updates to the department to obtain approval. The department may review the
				plan upon request. This program shall include at least one designated
				individual assigned by the owner. Requirements for this position shall include
				training and experience in cross-connection control programs.
B. The CCCP shall not be in conflict with the
				USBC and applicable building code regulations, including 13VAC5-63 or
				subsequent regulations promulgated by the Board of Housing and Community
				Development.
C. The CCCP shall
				ensure complete assessments of every consumer's water system and shall
				determine both the degree of hazard and the appropriateness of existing
				safeguards to prevent contamination from cross-connections and
				backflow.
D. The CCCP shall ensure
				testing, maintenance, and repairs of all backflow prevention assemblies,
				backflow elimination methods, and backflow prevention devices required and
				installed pursuant to
				12VAC5-590-610.
E.
									13VAC5-63-530,
				which incorporates the International Property Maintenance Code into the USBC,
				requires testing of RPZ assemblies, double check valve assemblies, double check
				detector backflow assemblies, and pressure vacuum breaker assemblies after
				initial installation, immediately after repairs or relocation, and annually
				thereafter. The CCCP shall establish procedures for completing and monitoring
				operational tests, or other evaluation procedures as appropriate, at least
				annually, and after installation, relocation, or repairs, for testable backflow
				prevention assemblies, devices, and methods that provide containment. The CCCP
				may include a public education program to:
1.
				Prompt consumer self-assessments, increase the awareness of cross-connections,
				and inform the consumer of the public health hazards of backflow.
2. The public education program, if provided
				as part of the CCCP, shall include, at a minimum, the following:
a. Causes of backflow;
b. Hazards and health effects of
				cross-connections and backflow;
c.
				Resources available to identify actual or potential
				cross-connections;
d. Safeguards to
				use to eliminate or control the hazards at the point of use; and
e. Sources for additional
				information.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-610 - Containment of backflow

Current through Register Vol. 40, No. 24, July 15, 2024
A. The
				owner shall ensure installation of backflow prevention assemblies or backflow
				elimination methods (i) at the service connection or (ii) downstream of the
				service connection but before any unprotected takeoffs.
B. Where the consumer's water system is not
				intricate or complex and where actual or potential cross-connection hazards can
				be eliminated or controlled, instead of containment, the owner may allow
				consumers to use point-of-use isolation protection by application of
				appropriate backflow prevention assemblies, backflow prevention devices, or
				backflow elimination methods complying with the USBC.
C. A backflow prevention assembly or backflow
				elimination method shall be installed where the following conditions exist:
1. A substance is handled in such a manner as
				to create an actual or potential hazard to a waterworks (this shall include
				premises having sources or systems containing process fluids or waters
				originating from a waterworks which are no longer under the control of the
				owner);
2. There exists internal
				cross-connections that, in the judgment of the owner or the department, may not
				be easily correctable or have intricate or complex plumbing arrangements that
				make it impracticable to determine whether or not cross-connections
				exist;
3. There are security
				requirements or other prohibitions or restrictions that prevent the assessment
				of all potential cross-connections that may impair the quality of the water
				delivered;
4. There is a repeated
				history of cross-connections being established or reestablished;
5. There are fire protection systems, lawn
				sprinkler systems, or irrigation systems;
6. The owner or department can show that a
				potential cross-connection hazard exists.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-620

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-630 - Backflow prevention assemblies, devices, and backflow elimination methods for containment

Current through Register Vol. 40, No. 24, July 15, 2024
A. Any
				backflow prevention assembly or backflow elimination method or backflow
				prevention device shall be of the approved type and shall comply with the USBC.
B. General safeguards
1. The backflow prevention assembly or
				backflow elimination method or backflow elimination device used shall depend on
				the degree of hazard that exists or may exist. The safeguard shall ensure
				maintenance of the distribution system water quality and its
				usefulness.
2. The degree of
				hazard, either high or low, is based on (i) the nature of the contaminant; (ii)
				the potential of the health hazard; (iii) the potential method of backflow
				(either by backpressure or by backsiphonage); and (iv) the potential effect on
				waterworks structures, equipment, and appurtenances used in the storage,
				collection, purification, treatment, and distribution of potable water. Table
				630.1 shall be used as a guide to determine the degree of hazard for any
				situation.
Table 630.1
Determination of Degree of Hazard
Cross-connections that meet or may meet the following
							 conditions shall be rated at the corresponding degree of hazard.
High Hazard
Low Hazard
The contaminant would be toxic, poisonous, noxious,
							 unhealthy, or of unknown quality.
The contaminant would only degrade the quality of the
							 water aesthetically or impair the usefulness of the water.
A health hazard would exist.
A health hazard would not exist.
The contaminant would disrupt the service of piped
							 water for human consumption.
The contaminant would not disrupt service of piped
							 water for human consumption.
Backflow would be by either backpressure or
							 backsiphonage.
Backflow would occur by backsiphonage.
Examples: lawn irrigation systems, fire sprinkler
							 systems with chemical additives or antifreeze, sewage, used water, nonpotable
							 water, auxiliary water systems, and mixtures of water and other liquids, gases,
							 or other chemicals.
Examples: food residuals, coffee machines,
							 non-carbonated beverage dispensers, and residential fire sprinkler systems
							 constructed of materials designed for potable water flow.
3.
				The USBC and the manufacturer's specifications shall be used to determine the
				appropriateness of the backflow prevention assembly or backflow prevention
				device application for containment.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-640 - General design considerations

Current through Register Vol. 40, No. 24, July 15, 2024
A. Waterworks shall conform to the Public
				Water Supply Law, Article 2 of Chapter 6 of Title 32.1 of the Code of Virginia.
				Community waterworks shall be designed to provide for the estimated water
				demand for 10 to 30 years hence under predicted growth conditions. All
				waterworks shall be designed so that they can readily be increased in capacity
				except where circumstances preclude the probability of expansion. Expansion by
				modular steps should be considered.
B. Waterworks design shall be based on sound
				engineering practice substantiated in the engineer's design and approved by the
				department. Historical data or typical usage figures of waterworks with similar
				service area characteristics and appropriate peaking factors shall be used to
				support the design. USBC and design standards may be referenced for
				noncommunity waterworks, as appropriate.
1.
				Community waterworks shall be designed to meet or exceed the estimated maximum
				daily water demand of the service area at the design year. The design shall
				account for diurnal demand patterns and special demands placed on the
				waterworks such as firefighting, industrial use, and wholesale
				customers.
2. Noncommunity
				waterworks shall be designed to meet or exceed the peak hour demand of the
				proposed services. Either pump capacity or storage capacity or both may be
				utilized to meet the peak hour demand.
3. Effective storage.
a. Community waterworks shall provide
				sufficient finished water effective storage to enable the waterworks to meet
				the estimated maximum daily water demand at the design year. Compliance with
				this requirement is normally determined by the use of a hydraulic model. In the
				absence of a hydraulic model, effective storage shall be a minimum of one-half
				of estimated maximum daily water demand of the waterworks at the design
				year.
b. There is no minimum
				finished water effective storage requirement for noncommunity
				waterworks.
c. Effective storage of
				atmospheric storage tanks shall be the volume available to store finished water
				in atmospheric reservoirs or tanks, measured as the difference between the
				overflow elevation, or the normal maximum operating level, and the minimum
				storage elevation. For atmospheric tanks that use a portion of their volume to
				generate distribution system pressure, the minimum storage elevation is that
				elevation of water in the tank that can provide a minimum pressure of 20 psig
				throughout that tank's service area under distribution system-wide maximum
				daily water demand.
d. Effective
				storage of pressure storage tanks shall be one-third of the nominal pressure
				vessel storage capacity.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-650

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-660 - Site location

Current through Register Vol. 40, No. 24, July 15, 2024
A. Wells
				and water treatment plants shall be located above the projected 100-year flood
				elevation. A lower elevation may be considered if it can be adequately shown
				that the wells or treatment plants can be protected from flooding. Site grading
				and adequate drainage shall be provided. Springs subject to flooding shall not
				be approved. See
				12VAC5-590-840
				E for additional well location requirements.
B. The waterworks pumping and treatment
				facilities shall be readily accessible in all seasons. Access roads shall be
				provided.
C. Functional aspects of
				the site shall be considered in design, including the convenience of
				transportation facilities to the site and the availability of electric power
				from more than one source.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-670 - Site size

Current through Register Vol. 40, No. 24, July 15, 2024
A. The area
				reserved around a well or spring site shall conform to
				12VAC5-590-840
				D and
				12VAC5-590-840
				E.
B. The treatment plant site
				shall be of ample size to accommodate expansion, and ample space shall be
				provided at the treatment site for adequate handling of treatment plant
				residuals.
C. The disposal of water
				treatment plant residuals shall conform to the State Water Control Law, Chapter
				3.1 of Title 62.1 of the Code of Virginia.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-680 - Treatment process selection and BAT

Current through Register Vol. 40, No. 24, July 15, 2024
A. The following shall be considered when
				selecting treatment processes:
(i) the
				quality and variability of the source water and
(ii) possible future changes in the quality
				and quantity of the source water.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-690

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-700 - Metering total water production

Current through Register Vol. 40, No. 24, July 15, 2024
A. The design of all community waterworks
				shall provide metering of total water production.
B. The design of all NTNCs that provide
				treatment or have a design capacity of greater than 300,000 gallons per month
				shall provide metering of total water production.
C. The design of all TNCs that provide
				treatment or have a design capacity of greater than 300,000 gallons per month
				shall provide metering of total water production.
D. If the waterworks treatment process
				results in a waste flow, including filter backwash, ion exchange regenerate, or
				residual solids, then the design shall provide metering of total source water
				withdrawn and finished water produced.
E. Metering of total water production at
				waterworks that do not meet the conditions found in subsections A through D of
				this section should be provided.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-710

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-720 - Building design and construction

Current through Register Vol. 40, No. 24, July 15, 2024
A. In accordance with the USBC, Chapter 6
				(§ 36.97 et seq.) of Title 36 of the Code of Virginia, and the Statewide
				Fire Prevention Code (§ 27.94 et seq.) of Title 27 of the Code of
				Virginia, all waterworks building design and construction shall include
				necessary features that will assure a functional and safe environment,
				including adequate ventilation, lighting, heating, drainage, dehumidification,
				and accessibility to equipment for operation and maintenance.
B. Consistent with subdivision A of this
				section, the waterworks building design and layout shall incorporate safety
				provisions to protect waterworks operators and other personnel, in accordance
				with Article 1 (§
									40.1-22
				) of Chapter 3 of Title 40.1 of the Code of Virginia. These provisions must
				comply with federal occupational safety and health standards and regulations
				promulgated under
				29
				USC §
										651 et seq. and shall include
				separation of incompatible chemicals, confined space entry, handrails and
				guards, ladders, lighting, warning signs, smoke detectors, chlorine leak
				detectors, protective equipment, safety showers, eye washes, and fire
				extinguishers.
C. Positive
				identification of the contents of a piping system shall be by lettered legend
				giving the name of the contents. Arrows shall be used to indicate the direction
				of flow. Legends shall be applied close to valves, adjacent to changes in
				direction and branches, where pipes pass through walls and floors, and at
				frequent intervals on straight pipe runs. The lettering shall be of such color,
				size, and location so as to be clearly visible and readable.
D. Common division walls between basins or
				conduits containing nonpotable water and potable water are prohibited. Vertical
				double division walls, where separated sufficiently to permit ready access for
				inspection, are permissible where the division walls are monolithic in
				construction and are properly keyed into their footings or are cast
				monolithically with their footings.
E. Shop space and storage facilities shall be
				provided.
F. Wherever pipes pass
				through walls of concrete structures, extra wall castings to facilitate
				expansion and future uses shall be provided.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-725 - Automated monitoring and control systems

Current through Register Vol. 40, No. 24, July 15, 2024
The design of computers, including supervisory control and
				  data acquisition (SCADA) systems if used to monitor and control water treatment
				  and distribution system facilities, shall meet the following general
				  requirements:
1. Data security.
a. Automated systems used to display and
				record data or control functions that are connected to the internet shall be
				secure.
b. Backup power supply
				shall be provided to allow orderly shutdown of the computer system and prevent
				corruption of data. The protection shall also power associated communications
				equipment.
c. Adequate hardware
				shall be in place to allow a high degree of SCADA and computer system
				reliability and data security.
d.
				Adequate hardware and associated facilities shall be provided for data
				archiving.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-730 - Alternate power sources

Current through Register Vol. 40, No. 24, July 15, 2024
A. An
				emergency management plan for extended power outages shall be developed for
				each community waterworks as specified in
				12VAC5-590-505.
B. Alternative power sources at all
				waterworks shall be considered in the design to maintain a minimum level of
				service during an electrical power outage.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-740

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-750

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-760 - Laboratory facilities

Current through Register Vol. 40, No. 24, July 15, 2024
A. The
				design of laboratory facilities shall be compatible with the equipment
				provided, the water supply, and the design and complexity of the water
				treatment.
B. The design of
				community waterworks and NTNCs shall provide for adequate floor and bench
				space, adequate ventilation, adequate light, adequate separation of
				incompatible activities, adequate environmental controls, and auxiliary
				facilities sufficient to carry out reliable testing.
C.. Certified analytical laboratory
				facilities analyzing drinking water shall comply with 1VAC30-41.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-770 - Sampling and monitoring equipment

Current through Register Vol. 40, No. 24, July 15, 2024
A. Sample taps shall be provided so that
				water samples can be obtained from each source water and each entry point to
				the distribution system. At waterworks providing treatment, sample taps shall
				be provided at the entrance and exit of each unit treatment process and at the
				entry point to the distribution system.
1.
				For surface water treatment plants, a master control sink shall monitor source
				water, chemically treated water, settled water, combined filter water, and at
				the entry point to the distribution system.
2. All sample taps shall discharge in the
				downward direction and be provided with a suitable air gap to prevent
				cross-connection.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-780

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-790 - Process water

Current through Register Vol. 40, No. 24, July 15, 2024
Process water shall be taken from the finished water. An
				  approved backflow prevention assembly or device shall be installed on the
				  process water supply pipe before connection to the treatment process or
				  equipment.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-800

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-810 - Components, materials, and products

Current through Register Vol. 40, No. 24, July 15, 2024
All components, materials, and products that will be in
				  contact with source water, partially treated water, finished water, or water
				  treatment chemicals shall comply with NSF/ANSI/CAN Standard 61-2020.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-820 - New source water selection and sampling

Current through Register Vol. 40, No. 24, July 15, 2024
A. Preference shall be given to the best
				available sources of supply that present minimal risks of contamination from
				point and nonpoint pollution sources that contain a minimum of impurities that
				may be hazardous to health and that give the greatest potential of ensuring a
				sufficient quantity of potable water.
B. In all cases, sources shall be selected
				and maintained on a basis that will assure that the water is continuously
				amenable to available treatment processes. In selecting the source of water to
				be developed, the owner shall prove to the satisfaction of the department that
				the water to be delivered to the consumers will comply with
				12VAC5-590-340.
C. All water samples for bacteriological,
				chemical, physical, and radiological analyses shall be submitted to the DCLS or
				to a testing laboratory certified by the DCLS. Analytical methods shall be in
				accordance with
				12VAC5-590-440.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-840 - Groundwater sources

Current through Register Vol. 40, No. 24, July 15, 2024
A. A groundwater
				source includes all water obtained from drilled wells and springs. Wells and
				springs shall be protected from contamination during construction. All wells
				intended to serve a waterworks shall be constructed by a certified water well
				system provider. All wells shall be constructed in a manner to protect
				groundwater resources by preventing contaminated water or water having
				undesirable physical, chemical, or radiological characteristics from entering
				aquifers.
B. All wells located
				within the Eastern Virginia or the Eastern Shore Groundwater Management Areas
				shall be constructed in a manner to protect groundwater resources by preventing
				blending or cross contamination of the aquifers.
1. Wells shall not be constructed with
				screens in multiple aquifers.
2.
				Geophysical logging and formation sampling shall be required for all wells
				during construction, in addition to submitting a Uniform Water Well Completion
				Report, Form GW-2.
3. Observation
				and production wells shall be constructed with gravel packs and grout in a
				manner that prevents movement between aquifers. Gravel pack shall be terminated
				close to the top of the well screens and shall not extend above the top of the
				screened aquifer. The remainder of the annular space shall be filled with grout
				material.
4. Pump intake setting
				shall be documented and the pump intake shall not be set below the top of a
				confined aquifer or the bottom of an unconfined aquifer that supplies water to
				the well.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-850 - Appropriate treatment

Current through Register Vol. 40, No. 24, July 15, 2024
A. The
				design of water treatment facilities shall depend upon the evaluation of the
				nature and quality of the particular source water to be treated and the
				required quality of the finished water. Treatment process selection shall
				follow the requirements of
				12VAC5-590-680.
B. The design of water treatment facilities
				shall address safety considerations as required in
				12VAC5-590-560.
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-860 - Chemical application

Current through Register Vol. 40, No. 24, July 15, 2024
A. Plans
				and specifications shall be submitted for evaluation and approval, as required
				in Part I (12VAC5-590-200
				through
				12VAC5-590-220
				), and shall include:
1. Descriptions of feed
				equipment, including maximum and minimum feed ranges;
2. Location of feeders, piping layout, and
				points of application;
3. Chemical
				storage and handling facilities;
4.
				Specifications for chemicals to be used;
5. Operating and control features;
				and
6. Descriptions of testing
				equipment and procedures.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-865 - Conventional filtration treatment

Current through Register Vol. 40, No. 24, July 15, 2024
A. Conventional filtration treatment is
				generally used for surface water sources. It is defined as a series of four
				processes: coagulation, flocculation, sedimentation, and filtration. The
				specific design parameters shall consider the water supply characteristics and
				variability in quality due to seasonal and climatic events.
B. Conventional filtration treatment plants
				shall provide staged, multiple treatment process units to allow individual
				units to be taken out of service without disrupting operation.
C. The department may require
				presedimentation of waters containing high turbidity or organics (as measured
				by TOC).
1. Presedimentation basins utilizing
				a coagulant feed shall have hoppered bottoms or shall be provided with
				continuous sludge removal equipment. The minimum hydraulic detention time shall
				be three hours. The department may require greater detention times depending on
				the source water quality and the level of pretreatment required.
2. Presedimentation basins without coagulant
				feed shall provide a minimum hydraulic detention time of 24 hours. The design
				shall address future needs for solids removal and handling.
3. Incoming water shall be dispersed across
				the full width of the line of travel as quickly as possible. Short circuiting
				shall be minimized. The department may require baffling on large
				basins.
4. Provisions for bypassing
				presedimentation basins shall be provided.
5. Surface runoff shall be prevented from
				entering presedimentation basins or reservoirs.
6. Dikes shall be structurally sound and
				protected against wind action and erosion.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-870

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-871 - Coagulation and flocculation

Current through Register Vol. 40, No. 24, July 15, 2024
A.
				Rapid mixing is the rapid dispersion of chemicals throughout the water to be
				treated, usually by violent agitation, to promote coagulation.
1. Rapid mix basins or inline static mixers
				shall be provided.
2. Basins shall
				be equipped with mechanical mixing devices. Other arrangements, such as
				baffling, may be acceptable under special conditions and only when approved by
				the department. Where mechanical mixing devices are utilized, duplicate units
				or spare mixing equipment shall be provided.
3. Rapid mix basins with mechanical mixers
				should be based upon the mean temporal velocity gradient "G" (expressed as
				units of seconds-1). The owner's engineer shall
				submit the basis for the selected velocity gradient considering the chemicals
				to be added and water temperature. Typical values for G and T are:
TABLE 871.1
Rapid Mix Basin GT Values
T (seconds)
G (seconds-1)
20
1,000
30
900
40
700
60
600
a. The point of
				application of the coagulant shall be at the point of maximum mixing
				intensity;
b. The physical
				configuration of the mixing basin shall be designed to eliminate vortexing;
				and
c. Mechanical mixers should be
				designed to allow speed variation with a highest speed of at least three times
				the lowest speed.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-872 - Sedimentation

Current through Register Vol. 40, No. 24, July 15, 2024
A. The water
				treatment plant capacity, source water quality, and filtration process used
				shall be considered in determining the number and design of sedimentation
				basins.
B. The minimum settling
				time shall be four hours for water treatment plants employing rapid rate
				gravity filters, and a minimum of three hours for water treatment plants using
				high rate gravity filters. Reduced settling times may be approved by the
				department where effective settling is demonstrated. Effective settling time
				shall be calculated using the volume of the basins from the stilling wall to
				the submerged effluent orifice or weir, including the volume under launders or
				finger weirs.
C. Inlets shall be
				designed to distribute the water equally and at uniform velocities. Open ports,
				submerged ports, stilling walls, and similar entrance arrangements are
				required. Port velocities should be in the range of 0.5 to 1.5 ft/sec. Where
				stilling walls are not provided, a baffle shall be constructed across the basin
				close to the inlet and shall project several feet below the water surface to
				dissipate inlet velocities and provide uniform flows across the
				basin.
D. Outlet weirs or submerged
				orifices shall be designed to maintain settling velocities in the basin and
				minimize short circuiting. Outlet weirs and submerged orifices shall be
				designed as follows:
1. The rate of flow over
				the outlet weir shall not exceed 20,000 gpd/ft of the outlet launder.
2. Submerged orifices shall not be located
				lower than three feet below the normal water surface.
3. The entrance velocity through the
				submerged orifices shall not exceed 0.5 ft/sec.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-873 - Solids contact treatment units

Current through Register Vol. 40, No. 24, July 15, 2024
A. Solids contact units shall be acceptable
				for combined flocculation and clarification where source water characteristics
				are not variable and flow rates are uniform. When approved, these units shall
				be designed for the maximum uniform rate and shall be adjustable to changes in
				flow that are less than the design rate and for changes in water
				characteristics.
B. A minimum of
				two units shall be provided.
C. A
				rapid mix device designed in accordance with 12VAC5-590-871 A shall be
				provided. Mixing devices shall be constructed to:
1. Provide good mixing of the source water
				with previously formed sludge particles; and
2. Prevent deposition of solids in the mixing
				zone.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-874 - Gravity filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A. At least
				two gravity filter units shall be provided in conventional filtration treatment
				plants and direct filtration treatment plants.
B. Filter loading rates shall not exceed 2.0
				gpm/ft2 of filter area for rapid rate filters and
				shall not exceed 4.0 gpm/ft2 for high rate filters,
				during normal operation. Alternative loading rates may be approved by the
				department when effective filtration is demonstrated.
C. The filter structure shall be so designed
				as to comply with the following:
1. The walls
				within the filter shall be vertical;
2. The filter walls shall not protrude into
				the filter media;
3. There shall be
				no common wall between filtered or finished water and any lesser quality
				water;
4. The filter shall be
				covered by a superstructure if determined necessary under local climatic
				conditions;
5. There shall be head
				room to allow normal inspection and operation;
6. A curb at least four inches high shall
				surround each filter to prevent floor drainage into the filter;
7. The maximum velocity gradient of treated
				water in pipes and conduits to the filters shall not exceed that used in
				flocculation. Where velocity gradient is not used as a design parameter, the
				linear velocity in pipes and conduits from settling basins to filters shall not
				exceed 1.0 ft/sec;
8. Influent
				pipes or conduits, where solids loading is heavy, shall be straight and
				equipped with cleanouts;
9.
				Backwash water drain capacity shall be sufficient to carry the maximum
				flow;
10. Access in the form of
				walkways not less than 24 inches in width shall be provided to each filter;
				and
11. The normal operating water
				surface on a filter shall be at the same hydraulic grade level as the
				sedimentation basin, if no intermediate treatment process is
				provided.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-875 - Direct filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A. Direct
				filtration is defined as a series of treatment processes, including coagulation
				and filtration but excluding sedimentation. Direct filtration shall be
				considered only for treatment of high quality and seasonally consistent surface
				water sources or GUDI sources.
B.
				An in-plant demonstration study or pilot study shall be required to demonstrate
				acceptable performance of direct filtration. The study shall be conducted over
				a sufficient time to treat all expected source water conditions throughout the
				year. The pilot plant filter shall be of a similar type and operated in the
				same manner as proposed for full-scale operation.
C. The department may require
				presedimentation meeting the requirements of 12VAC5-590-865 C to be provided
				(in the treatment sequence) to direct filtration treatment plants.
D. Rapid mix coagulation and flocculation
				shall be provided, meeting the requirements of 12VAC5-590-871.
E. Filters shall be dual media or multimedia
				gravity filters. Design of filtration units shall meet requirements for rapid
				rate or high rate gravity filters in 12VAC5-590-874, including filter
				structure, filter media, support gravel, backwash provisions, rate-of-flow
				control, surface wash, or air scour. Alternative designs may be considered by
				the department.
F. Turbidity
				monitoring.
1. Indicating and recording
				turbidimeters meeting the requirements of
				12VAC5-590-770 B
				shall be provided for:
a. The source
				water;
b. The filter effluent from
				each filter; and
c. The
				CFE.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-880 - Diatomaceous earth filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A.
				Diatomaceous earth filtration shall be limited to treatment of a surface water
				source, a GUDI source, or both with low turbidity and low bacterial
				contamination, and may be used for iron removal from groundwater.
B. Pilot plant study. Installation of a
				diatomaceous earth filtration system shall be preceded by a pilot plant study
				on the water to be treated.
C.
				Types of filters. Pressure or vacuum diatomaceous earth filtration units will
				be considered for approval.
D.
				Treated water storage. Treated water storage capacity in excess of normal
				requirements shall be provided to:
1. Allow
				operation of the filters at a uniform rate during all conditions of system
				demand at or below the approved filtration rate, and
2. Guarantee continuity of service during
				adverse source water conditions without bypassing the system.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-881 - Slow sand filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A. Slow
				sand filters shall be approved only after a pilot study demonstrates that the
				water supply contains sufficient nutrients for use of this treatment
				technology.
B. At least two filters
				shall be provided. In all cases, the filters shall be capable of meeting the
				design maximum daily water demand with one filter out of service.
C. Sand shall be clean silica sand that meets
				the following criteria:
1. The effective size
				shall be between 0.15 mm and 0.35 mm;
2. The uniformity coefficient shall not
				exceed 2.5; and
3. The sand depth
				shall not exceed 55 inches. A minimum depth of 30 inches is required for normal
				operation.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-882 - Membrane filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A.
				Applicability. This section pertains to the use of membrane filtration as
				follows:
1. For pathogen and turbidity log
				removal credits in accordance with Table 500.1 in
				12VAC5-590-500,
				the use of MF and UF are allowed.
2. For softening, total dissolved solids
				(TDS) removal, organics removal, and other treatment purposes, reverse osmosis
				(RO) and nanofiltration (NF) are allowed in accordance with
				12VAC5-590-680
				G.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-883 - Bag and cartridge filtration

Current through Register Vol. 40, No. 24, July 15, 2024
A. Bag or cartridge filtration shall be
				limited to treating a surface water source, a GUDI source, or both with low
				turbidity.
B. A pilot plant study
				shall be conducted on the water to be treated before the installation of a bag
				or cartridge filter system.
C. Bag
				and cartridge filtration systems shall be granted removal credit for Giardia
				lamblia and Cryptosporidium in accordance with 12VAC5-590-401 E 6 a, provided
				that they meet the requirements of this section.
D. General design requirements.
1. All system components such as housing,
				bags, cartridges, gaskets, O-rings, and other components in contact with water
				shall be in accordance with
				12VAC5-590-810.
				All cartridge filter housing shall be certified by the ASME certification
				program, or equivalent, for pressure vessels and stamped with the appropriate
				certification mark.
2. Indicating
				and recording turbidimeters meeting requirements of
				12VAC5-590-770 B
				shall be provided for the source water and the CFE. The department may require
				indicating and recording effluent turbidimeters for each filter unit.
3. The maximum flux rate across the final
				filter shall not exceed 0.2 gpm/ft2.
4. Maximum differential pressure across the
				cartridge filter shall not exceed 20 psi.
5. Pressure gauges and sampling taps shall be
				provided before and after each bag or cartridge filter.
6. Provisions to accomplish filter-to-waste
				shall be provided.
7. Automatic
				start-up of bag or cartridge filters is prohibited.
8. An alarm system shall be provided that
				will report alarm conditions and shut down the treatment plant and entry point
				flow.
a. All alarms shall be reported to a
				location manned 24 hours per day or to a person on call and shall report alarm
				conditions audio-visually at the water treatment plant.
b. The following shall be monitored by the
				alarm system:
(1) Source water
				turbidity;
(2) Feed water
				flow;
(3) If applicable, filtrate
				turbidity from each unit exceeding operational control criteria;
(4) Combined filter effluent turbidity
				exceeding operational control criteria;
(5) Differential pressure at each unit;
				and
(6) Entry point disinfectant
				residual.
9. At
				least two filtering units shall be provided at plants having a rated capacity
				of greater than 100 gpm.
Virginia Administrative Code › Title 12 - HEALTH › Agency 5 - DEPARTMENT OF HEALTH › Chapter 590 - WATERWORKS REGULATIONS › Section 12VAC5-590-890

Current through Register Vol. 40, No. 24, July 15, 2024
Statutory Authority: §§
											32.1-12
					 and
					 32.1-170 of the Code
					 of Virginia.