reglab/statecodes huggingface dataset:
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-170 - Processing of plans, specifications and other engineering documents

Current through Register Vol. 40, No. 24, July 15, 2024
All reports, construction drawings, specifications and
						operation and maintenance manuals submitted to the department must be received
						at least 90 days prior to the date upon which action by the department is
						desired. If the plans and specifications are found to be incomplete or
						inadequate for detailed evaluation, the department will notify the party
						submitting the documents of the information necessary for a complete submittal
						within 30 days of receipt of the plans and specifications. If revisions to the
						plans or specifications are necessitated, a letter will be sent to the engineer
						who prepared them within 30 days of receipt outlining the necessary revisions.
						Revised plans or specifications constitute a resubmittal; therefore, additional
						time will be necessary for the review and technical evaluation (9VAC25-790-80 C). The owner may
						request the approval to begin construction prior to this notification in
						accordance with the provisions of this chapter. Preliminary plans and the
						engineer's report should be submitted for review and evaluation prior to the
						preparation of final plans unless the area engineer has agreed to omit this
						step in the evaluation process. One set of the approved plans and
						specifications will be stamped by the area engineer and returned to the
						owner.
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-190 - CTO

Current through Register Vol. 40, No. 24, July 15, 2024
A. Issuance. Upon
					 receipt of the construction completion statement, the director may issue a
					 final CTO. However, the director may delay the granting of the CTO pending
					 inspection, or satisfactory evaluation of effluent test results, to ensure that
					 the work has been satisfactorily completed.
B. Conditional CTO. A conditional CTO may be
					 issued specifying final approval conditions, with specific time periods, for
					 completion of unfinished work, submission of operations and maintenance manual,
					 sludge management plans, or other appropriate items.
The director may issue a conditional CTO to owners of
						sewerage systems or treatment works for which the required information for
						completion of construction has not been received. Such CTOs will contain
						appropriate conditions requiring the completion of any unfinished or incomplete
						work including approval of a closure plan and subsequent submission of the
						statement of completion of construction.
C. Final CTO. Consideration will be given to
					 issuance of an interim CTO to individual unit operations of the treatment
					 process system so as to allow utilization of these unit operations prior to
					 completion of the total project. A final CTO shall be issued upon verification
					 that the requirements of this chapter have been complied with.
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-200 - CTO modifications or revocation actions

Current through Register Vol. 40, No. 24, July 15, 2024
A. Amendment or reissuance. The director may
					 amend or reissue a CTO where there is a change in the manner of the collection,
					 the treatment, or the source of sewage or sewage sludge at the permitted
					 location, or for any other cause incident to the protection of the public
					 health and welfare, provided notice is given to the owner, and, if one is
					 required, a hearing held in accordance with the provisions of the
					 Administrative Process Act.
B.
					 Revocation or suspension. The director may suspend or revoke a CTO in
					 accordance with the Administrative Process Act for the following reasons:
1. Failure to comply with the conditions of
					 the CTO.
2. Violation of Title 62.1
					 of the Code of Virginia or of any of this chapter from which no variance or
					 waiver has been granted.
3. Change
					 in ownership.
4. Abandonment of the
					 sewerage systems or treatment works.
5. Any of the grounds specified in §
					 62.1-44.2 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-220 - Local review for sewerage systems

Current through Register Vol. 40, No. 24, July 15, 2024
In lieu of obtaining a CTC and CTO for each sewage
						collection project, an owner may elect to obtain approval for a master plan and
						subsequent local review for connections to, or extensions of, existing sewerage
						systems. The area engineer will provide technical review support for review of
						such requests. The following procedure for obtaining the approval for local
						review shall be used:
1. Local plans
					 and specifications. The owner shall develop, adopt, and request approval of
					 general local specifications and plan details covering sewage collection design
					 and construction. For local government or owner approvals, the sewerage system
					 owner must provide for preparation and evaluation of design documents either
					 within the appropriate local government agency, or by separate professional
					 entities or firms, and submit a formal description of such arrangements to the
					 area engineer for evaluation and approval by the director.
2. Master plan. The owner shall develop a
					 plan which outlines the following system specific requirements and the owner's
					 method of compliance with such requirements:
a. Design criteria and construction
					 specifications used by the owner,
b. Evidence that personnel with the training
					 and experience necessary to ensure compliance with the program requirements are
					 employed by the owner,
c. Location
					 of interceptors and force mains, with design flows, for each designated service
					 area within the collection systems conveying flow to the treatment works,
					 and
d. A certificate method for
					 certifying that sewerage system projects meet the requirements of these
					 regulations, and that the project is in compliance with the master plan and
					 local standards and specifications approved by the director.
The local owner approval certificate should describe the
						project to be constructed in accordance with bid documents and provide for the
						identification, position and signature of the local official responsible for
						project oversight.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-230 - Compliance with Part II (9VAC25-790-260 et seq.-Operational Regulations) of this chapter

Current through Register Vol. 40, No. 24, July 15, 2024
A. CTOs
					 issued prior to July 1, 2003. CTOs issued by either the board (including joint
					 certificates to operate) or through the local health department, prior to July
					 1, 2003, shall continue in force until reissued or amended in accordance with
					 this chapter.
B. Monitoring. All
					 sewerage systems and treatment works owners shall comply with the Part II
					 operational regulations except as provided in accordance with this chapter. Any
					 owner may request technical assistance from the area engineer as necessary to
					 implement corrective action. The director may require the owner or operator of
					 any sewerage systems or treatment works to:
(i) develop either an operation plan or an
					 operation and maintenance manual for approval by the department and
(ii) install, use, and maintain monitoring
					 equipment for internal process testing of sewage flowing through the treatment
					 works in order to identify and determine the causes of operational problems and
					 to determine the necessary corrective actions to correct such problems. If
					 required, test results shall be recorded, compiled, and reported to the area
					 engineer in a format approved by the department.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part I - Procedural Regulations › Article 2 - Procedures › Section 9VAC25-790-250 - Sewage Collection and Treatment Advisory Committee

Current through Register Vol. 40, No. 24, July 15, 2024
A. The director shall appoint a Sewage
					 Collection and Treatment Regulation Committee consisting of at least eight
					 appointed members and four ex-officio members as specified in this section.
					 Advisory committee membership should be representative of large size and small
					 size communities and their consultants.
B. Organizations. Appointed committee members
					 shall be selected from organizations such as:
a. The Virginia Water Environment Association
					 (VWEA).
b. Virginia Association of
					 Municipal Wastewater Agencies (VAMWA).
c. Virginia Society of Professional
					 Engineers.
d. Sewerage Systems and
					 Treatment Works Owners.
e.
					 Consulting Engineers Council of Virginia.
f. State universities and college faculty.
Consideration shall also be given to appropriate citizens
						who are not members of these organizations and other interested parties and
						groups such as the Citizens Conservation Network.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part II - Operational Regulations › Article 1 - Monitoring › Section 9VAC25-790-260 - Influent and effluent monitoring

Current through Register Vol. 40, No. 24, July 15, 2024
A. Methods. Sampling and testing methods
					 shall conform to permit requirements, or if not specified, to current United
					 States Environmental Protection Agency (EPA) guidelines establishing test
					 procedures for analysis of pollutants or other EPA approved methods.
B. Schedule. The operation and maintenance
					 manual shall contain a specific testing schedule of the minimum tests and their
					 frequencies to be conducted by the facility in accordance with the appropriate
					 certificate and permit issued. If not specifically addressed in the issued
					 certificate and permit, influent and effluent monitoring shall be in accordance
					 with this schedule. Typical tests are listed in
					 9VAC25-790-960.
C. Sampling. The following sampling
					 instructions shall be followed when collecting samples as required to comply
					 with this chapter and standards contained in this chapter.
1. Raw sewage samples are be collected prior
					 to the treatment process unit operations; samples may be collected following
					 the bar screen or comminutor.
2.
					 Final effluent samples are to be taken at a point following all unit operations
					 in the treatment process. An evaluation of chlorine reduction or dechlorination
					 methods will require monitoring of chlorine residual and fecal coliform levels
					 in treated sewage flows following the chlorine contact tank.
3. Chlorine residual, fecal coliform, pH,
					 temperature and DO test samples may consist of grab samples of sewage flow
					 obtained immediately prior to analytical measurements.
4. Compositing of samples shall be in
					 accordance with the treatment works operation and maintenance manual. Composite
					 samples of sewage flows shall consist of grab samples taken at a minimum
					 frequency of one per hour and should be combined in proportion to flow. Greater
					 frequency of grab sampling may be desirable where abnormal variation in waste
					 strength occurs. Automatic flow proportional samplers are considered a valid
					 sampling method.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part II - Operational Regulations › Article 1 - Monitoring › Section 9VAC25-790-270 - Operational testing and control

Current through Register Vol. 40, No. 24, July 15, 2024
A.
					 Methods. Sampling and testing methods shall conform to the issued certificate
					 and permit requirements. In addition, current United States Environmental
					 Protection Agency (EPA) guidelines and test procedures for analysis of
					 pollutants may be used, as well as other EPA recommended methods.
B. Schedule. The operation and maintenance
					 manual shall contain a specific schedule of the minimum tests and their
					 frequency to be conducted by the treatment works and sampling instructions.
					 Tests and sampling shall be in accordance with the requirements established by
					 the instructions contained in the treatment works' operation and maintenance
					 manual. Typical tests and sampling instructions are contained in this
					 chapter.
C. Information. If
					 necessary, additional operational control information may be requested on an
					 individual treatment works basis by the department to evaluate performance
					 reliability.
D. Records.
1. The owner shall maintain records on the
					 treatment works operation, maintenance and laboratory testing. The records
					 shall be available for review by department and area engineer during
					 inspections at reasonable times. Any records of monitoring activities and
					 results shall include at least the following for all samples:
a. The date, place, and time of sampling or
					 measurements.
b. Individual that
					 performed the sampling or measurements.
c. The dates analyses were
					 performed.
d. Individual that
					 performed analysis.
e. The
					 analytical techniques or methods used.
f. The results of such analyses.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part II - Operational Regulations › Article 1 - Monitoring › Section 9VAC25-790-280 - Land based monitoring system

Current through Register Vol. 40, No. 24, July 15, 2024
A. Land application of effluent. The
					 Operation and Maintenance Manual shall contain a schedule of required minimum
					 tests and their frequency to be conducted for the land treatment system and
					 shall also contain instructions for recording and reporting. Monitoring,
					 reporting, and recording for land treatment systems shall be in accordance with
					 the treatment works' Operation and Maintenance Manual. Information concerning
					 monitoring, recording and reporting for land application of effluent are
					 contained in this chapter.
B.
					 Sewage sludge and residual solids management. Either the Operation and
					 Maintenance Manual or the sludge management plan shall contain a list of
					 required minimum tests to be conducted for the sewage sludge and residual
					 solids management system and shall also contain instructions for recording and
					 reporting. Monitoring, reporting, and recording requirements for sewage sludge
					 and residual solids management shall be in accordance with the sludge
					 management plan or operation plan in accordance with this chapter and the
					 Biosolids Use Regulations (12VAC5-585). Suggested monitoring, reporting, and
					 recording for sewage sludge and residual solids management are described in
					 this chapter. The record keeping and reporting requirements for sewage sludge
					 and residual solids management contained in the treatment works Operation and
					 Maintenance Manual or sludge management plan shall apply to all application
					 sites, regardless of size or frequency of application. However, the
					 requirements relative to monitoring, reporting, and recording of site specific
					 soils and the monitoring, reporting, and recording of ground water and surface
					 water are not applicable for any site that meets criteria established in the
					 Biosolids Use Regulations (12VAC5-585) for a monitoring waiver.
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part II - Operational Regulations › Article 2 - Operation and Maintenance Manuals › Section 9VAC25-790-290 - Manuals

Current through Register Vol. 40, No. 24, July 15, 2024
A. General. The
					 general purpose of the manual is to present both technical guidance and
					 regulatory requirements to facilitate operation and maintenance of the sewerage
					 systems and treatment works for both normal conditions and generally
					 anticipated adverse conditions. The manual should be designed as a reference
					 document, being as brief as possible while presenting the information in a
					 readily accessible manner. The manual shall be tailored to the size and type of
					 system being employed. The manual shall be directed toward the operating staff
					 required for the facility as listed in Table 1. The manual shall be updated as
					 necessary and be made available to the operating staff.
B. Contents. The manual shall contain the
					 elements included in
					 9VAC25-790-260 B;
					 9VAC25-790-270 B;
					 9VAC25-790-280 B; subsection A of
					 this section; and
					 9VAC25-790-300 B, C and D. In
					 addition, the manual should contain, for information and guidance purposes,
					 additional schedules that supplement these required schedules to assist
					 operations by defining desired levels of staffing, testing, etc. Suggested
					 contents are contained in
					 9VAC25-790-950 and
					 9VAC25-790-960.
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-310 - Design factors

Current through Register Vol. 40, No. 24, July 15, 2024
A. Sewage
					 collection systems shall be designed and constructed to achieve total
					 containment of the predicted sewage flows contributed from the established
					 service area and population. New combined sewers receiving direct storm water
					 drainage shall not be approved. Interceptor sewers for existing combined sewers
					 shall be designed and constructed to prevent the discharge of inadequately
					 treated wastes. Overflows from intercepting sewers shall be managed in
					 accordance with the issued certificate or permit.
B. Basis. In general, sewer systems should be
					 designed for the estimated ultimate tributary population with an upper limit
					 consisting of the 50-year population growth projection, except when considering
					 parts of the systems that can be readily increased in capacity. Consideration
					 shall be given to land use plans and to other planning documents and to the
					 maximum anticipated capacity of institutions, industrial parks, apartment
					 developments, etc.
C. Factors. In
					 determining the required capacities of sanitary sewers, the following factors
					 shall be considered:
a. Maximum hourly sewage
					 flow.
b. Additional maximum sewage
					 or wastewater flows from industrial sources.
c. Ground water infiltration.
d. Topography of area.
e. Location of sewage treatment
					 works.
f. Depth of
					 excavation.
g. Pumping
					 requirements.
h. Occupancy
					 rates.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-320 - Design details

Current through Register Vol. 40, No. 24, July 15, 2024
A. Sizing. For
					 the purpose of this chapter the gravity sewer design details as described
					 herein represent the best available standards of practice. Hydraulic
					 computations and other design data should clearly establish the capacity of
					 proposed sewers that do not conform to the minimum standards included in this
					 section.
1. Sewer size shall not be less than
					 eight inches in diameter, except under the following conditions:
a. Laterals serving six connections or fewer
					 on cul de sacs or as sidewalk collector lines may be six inches in
					 diameter.
b. Sewer lines carrying
					 settled sewage, such as septic tank effluent, may be as small as 1-1/2 inches
					 in diameter.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-330 - Construction details

Current through Register Vol. 40, No. 24, July 15, 2024
A. Pipe joints.
					 The method of joining pipe and the material used shall be included in the
					 design specifications in accordance with ASTM or other nationally recognized
					 standards and the joint material and joint testing shall conform to the
					 appropriate standards and specifications.
1.
					 Sewer joints shall be designed to prevent infiltration and to prevent the
					 entrance of roots.
2. When clay
					 sewer pipe is used, the joints shall be compression joints, made in conformance
					 with the appropriate ASTM specification.
3. When concrete pipe is used, single rubber
					 ring gasket joints shall conform to the appropriate ASTM
					 specification.
4. When asbestos
					 cement pipe, truss pipe, or ductile iron pipe is used, joints using couplings
					 and gaskets shall be made in conformance with the requirements of the
					 appropriate ASTM specification.
5.
					 Joints for plastic material pipe may be of compression gaskets, chemical welded
					 sleeves, or chemical fusion joints per manufacturers' recommendations.
Heat fusion joints may be used for high density
						polyethylene pipe.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-340 - Vacuum sewage system

Current through Register Vol. 40, No. 24, July 15, 2024
A.
					 Features. Vacuum sewer systems consisting of small diameter pipes that collect
					 sewage delivered through multiple service connection values and deliver that
					 flow under negative pressure to one or more receiving stations will be
					 considered on a case-by-case basis. The design shall include, but not be
					 limited to, the following criteria:
1. Minimum
					 pipe diameter shall be three inches for nonsettled sewage and 1-1/2 inches for
					 settled sewage.
2. Shut-off valves
					 shall be provided at branch connections with lines exceeding 300 feet and at
					 intervals no greater than 2000 feet on main vacuum lines. Valves shall not
					 obstruct the flow path when fully opened for operation. Gate valves and
					 butterfly valves may not be acceptable if the flow path is obstructed during
					 system operation.
3. Access points
					 equal to the vacuum line diameter shall be provided at the end of main and
					 branch lines and at intervals or locations suitable for operation and
					 maintenance of the system. Access or inspection points shall be provided so
					 that a suitable means for shut off of lines can be readily inserted.
4. Provisions for vacuum testing the piping
					 system shall be described and made available to the department.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-350 - Manholes

Current through Register Vol. 40, No. 24, July 15, 2024
A. Location.
					 Manholes shall be installed at the end of each line of eight-inch diameter or
					 greater; at all changes in grade, size, or alignment; at all intersections; and
					 at distances not greater than 400 feet for sewers 15 inches or less in diameter
					 and 500 feet for sewers 18 inches to 30 inches in diameter, except that
					 distances up to 600 feet may be adequate in cases where adequate modern
					 cleaning equipment for such spacing is provided.
1. Slightly greater spacing may be utilized
					 in larger sewers.
2. Terminal
					 cleanouts may be acceptable in place of manholes, on lines eight inches in
					 diameter or less, on a case-by-case basis. Cleanouts may be used in lieu of
					 manholes for collection of settled sewage. Manholes are required where four or
					 more sewers intersect, or where two or more sewers intersect at depths greater
					 than eight feet. Cleanouts shall be installed at distances not greater than 400
					 feet for settled sewage systems.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-360 - Water quality and public health and welfare protection

Current through Register Vol. 40, No. 24, July 15, 2024
A. Design
					 integrity. The tops of all sewers entering or crossing streams shall be at a
					 sufficient depth below the natural bottom of the streambed to protect the sewer
					 line. In general, one foot of suitable cover shall be provided where the stream
					 is located in rock and three feet of suitable cover in other material. Less
					 cover will be considered if the proposed sewer crossing is encased in concrete
					 and will not interfere with future improvements to the stream channel. Reasons
					 for requesting less cover shall be given in the application. Below paved
					 channels, the crown of the sewer lines should be placed under the channel
					 pavement. Sewers shall remain fully operational during the 25-year flood/wave
					 action. Sewers and their appurtenances located along streams shall be protected
					 against the normal range of high and low water conditions, including the
					 100-year flood/wave action. Sewers located along streams shall be located
					 outside of the streambed wherever possible and should be sufficiently removed
					 therefrom to provide for future possible channel widening. Reasons for
					 requesting sewer lines to be located within streambeds shall be given in the
					 application.
1. Sewers entering or crossing
					 streams shall be constructed of watertight pipe. The pipe and joints shall be
					 tested in place and shall exhibit zero infiltration. Sewers laid on piers
					 across ravines or streams shall be allowed only when it can be demonstrated
					 that no other practical alternative exists. Such sewers on piers shall be
					 constructed in accordance with the requirements for sewers entering or crossing
					 under streams. Construction methods and materials of construction shall be such
					 that sewers will remain watertight and free from change in alignment or grade
					 due to anticipated hydraulic and physical loads, erosion, and impact.
2. Depressed sewers or siphons shall have not
					 less than two barrels, with a minimum pipe size of six inches and shall be
					 provided with necessary appurtenances for convenient flushing and maintenance;
					 the inlet and outlet chambers shall be designed to facilitate cleaning; and, in
					 general, sufficient head shall be provided and pipe sizes selected to secure
					 velocities of at least three feet per second for average flows. The inlet and
					 outlet details shall be arranged so that normal flow is diverted to one barrel
					 and so that either barrel may be removed for service or cleaning.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 1 - Collection and Conveyance Sewers › Section 9VAC25-790-370 - System access

Current through Register Vol. 40, No. 24, July 15, 2024
Sewer location should be within streets, alleys, and
						utility rights-of-way. Approvals shall be obtained from the appropriate
						jurisdictions for placement of sewers within these boundaries.
Where it is impossible to avoid placing sewers (and
						manholes/cleanouts) on private property, the owner shall have recorded
						easements or have filed certificates of condemnation from all parties
						possessing or having legal interest in an adequate right-of-way necessary for
						proper installation, maintenance, operation, and removal of sewerage
						facilities. These easements shall include provisions for controlling the
						location of fences, buildings, or other structures within the easement and
						shall be shown on the plans.
Statutory Authority
§ 62.1-44.19 of the Code of Virginia.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-390 - Reliability

Current through Register Vol. 40, No. 24, July 15, 2024
A. Purpose.
					 Reliability provisions are based on a measurement of the ability of a component
					 or system to perform its designated function without failure or interruption of
					 service. Overflow criteria, such as a period of discharge, are utilized solely
					 for the establishment of reliability classification for design purposes and are
					 not to be construed as authorization for, or defense of, an unpermitted
					 discharge to state waters.
1. The objective
					 of achieving reliability protection is to prevent the discharge of raw or
					 partially treated sewage to any waters and to protect public health and welfare
					 by preventing backup of sewage and subsequent discharge to basements, streets
					 and other public and private property. Provisions for continuous operability of
					 pumping stations shall be evaluated in accordance with the appropriate
					 reliability classification.
2. For
					 Class I Reliability, alternate motive force sufficient to operate the station
					 at peak flow rates being received shall be operating the station prior to the
					 expiration of an allowable time period. The maximum allowable period will be
					 the time transpiring between the high liquid level alarm and the occurrence of
					 an overflow, or backup and subsequent discharge, at flow rates being received
					 (except when an emergency holding basin is provided to satisfy the requirement
					 for continuous operability). The transpired time to be considered allowable may
					 be the critical (shortest) transpired time (peak flow rates) or a spectrum of
					 transpired times keyed to the 24 individual hours of the day. Certain
					 Reliability Class I pump stations, for which it is feasible to shut down or
					 discontinue operation during periods of power failure without bypassing or
					 overflowing, may be exempted from the continuous operability requirement. Pump
					 stations which may qualify for the exemption can be broadly categorized as
					 those which serve facilities or institutions which would be closed during
					 periods of power failure, such as certain industrial plants, schools and
					 recreational and park areas.
3. For
					 Class II Reliability, alternate motive force sufficient to operate the station
					 at peak flow rates being received shall be operating the station prior to the
					 expiration of a 24-hour period commencing at the time an overflow or discharge
					 subsequent to a backup begins.
4.
					 Reliability Class III pump stations are not limited to a specific period of
					 overflow or discharge, and will be considered on a case-by-case
					 basis.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-400 - Pumping equipment

Current through Register Vol. 40, No. 24, July 15, 2024
A. Proper
					 location. Where practicable, the electric switchgear and motor control centers
					 should be housed above grade and in a separate area from the dry well. All
					 motors and control enclosures shall be adequately protected from moisture from
					 the weather and water under pressure. In cases where equipment may be damaged
					 by flooding from natural events, in such a manner as to cause excessive delays
					 in restoring the pump station to design operating levels, the means of
					 protecting or removing such equipment prior to flooding should be described in
					 the Operation and Maintenance Manual. Motors located indoors and near liquid
					 handling piping or equipment shall be, at least, of-splash-resistant design.
					 Means for heating motors located outdoors or in areas where condensation may
					 occur should be provided. On-site emergency power generation equipment shall be
					 located above grade and be adequately ventilated. Fuel shall be stored in safe
					 locations and in containers specifically designed for fuel storage.
B. Electrical protection. All electrical
					 equipment design (motors, controls, switches, conduit systems, etc.) located in
					 raw sewage wet wells or in totally or partially enclosed spaces where hazardous
					 concentrations of flammable liquids, gases, vapors, or dusts may be present
					 will be evaluated in accordance with the appropriate requirements of the
					 National Electrical Code (e.g., Class I, Group D, Division I for ignitable
					 gases or vapors, etc.) and VOSH requirements.
1. Three-phase motors and their starters
					 shall be protected from electric overload and short circuits on all three
					 phases.
2. All motors shall have a
					 low voltage protection device which, on the reduction or failure of voltage,
					 will cause and maintain the interruption of power to that motor. The low
					 voltage protection device should protect each phase of 3-phase
					 motors.
3. Consideration should be
					 given to the installation of temperature detectors in the stator and bearings
					 of larger motors in order to give an indication of overheating
					 problems.
4. Wires in underground
					 conduits or in conduits that may be flooded shall have moisture resistant
					 insulation as identified in the National Electrical Code.
5. Concrete, metals, control and operating
					 equipment, and safety devices shall, insofar as practical, be designed to
					 protect against corrosion.
6.
					 Electrical power devices or equipment used to convert single phase power to
					 three phase power shall be dedicated to a single specific motor.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-410 - Portable equipment and diversions

Current through Register Vol. 40, No. 24, July 15, 2024
A. Needs. Portable equipment (pumps or
					 generator sets) shall be acceptable to satisfy the continuous operability
					 requirements where, under critical conditions imposed by rush hour traffic,
					 multiple pumping station failures, etc., the portable equipment transportation,
					 connection and starting can be accomplished within allowable time periods.
1. Portable pumping equipment shall have the
					 following provisions:
a. Pumping units shall
					 have capability to operate between the wet well and the discharge side of the
					 station.
b. Each station served by
					 portable pumping equipment shall facilitate rapid and easy connection of
					 lines.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-420 - Alarm systems

Current through Register Vol. 40, No. 24, July 15, 2024
A. The alarm
					 system provided to monitor pump station operation shall meet the appropriate
					 reliability requirements.
B. Class
					 I. For Class I reliability, the alarm system shall monitor the power supplies
					 to the station, auxiliary power source, failure of pumps to discharge liquid,
					 and high liquid levels in the wet well and in the dry well, and shall include a
					 test function. An on-site audio-visual alarm system shall be provided such that
					 each announced alarm condition is uniquely identified. In addition, provisions
					 shall be made for transmitting a single audible alarm signal to a central
					 location where personnel competent to receive the alarm and initiate corrective
					 action are either:
(i) available 24 hours per
					 day, or
(ii) available during the
					 periods that flow is received at the pump station. A sign indicating
					 notification procedures (responsible persons, telephone numbers, etc.) to be
					 followed in case of alarm actuation shall be displayed conspicuously.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-430 - Alternatives

Current through Register Vol. 40, No. 24, July 15, 2024
A. General. Wet
					 well-dry well pump stations shall meet the applicable requirements for both
					 types of systems. Both wet and dry wells shall be separated to prevent leakage
					 of gas into the dry well. A separate sump pump or suitable means shall be
					 provided in the dry well to remove leakage or drainage, with the discharge
					 above the high water level of the wet well. Vacuum ejectors connected to a
					 potable water supply will not be approved. All floor and walkway surfaces shall
					 have an adequate slope to a point of drainage. Drainage shall be unobstructed
					 by conduit, piping, etc., installed on the dry well floor.
B. Suction lift. Suction lift pump
					 installations shall be designed to meet the applicable requirements of this
					 chapter.
1. The capacity of suction lift pump
					 stations shall be limited by the net positive suction head and specific speed
					 requirements as stated on the manufacturer's pump curve under the most severe
					 operating conditions.
2. All
					 suction lift pumps shall be provided with an air relief line on the pump
					 discharge piping. This line shall be located at the maximum elevation between
					 the pump discharge flange and the discharge check valve to ensure the maximum
					 bleed-off of entrapped air. Air relief piping shall have a minimum diameter
					 adequate to purge air during priming. The use of 90° elbows in air relief
					 piping should be avoided. A separate air relief line shall be provided for each
					 pump discharge. The air relief line shall terminate in the wet well or suitable
					 sump and open to the atmosphere.
3.
					 Valving to prevent recycle of flow to the wet well should be provided on all
					 relief lines. The air relief valves shall be located as close as practical to
					 the discharge side of the pump. Automatic operating air relief valves may be
					 used if the design of the particular valve is such that the valve will fail in
					 the open position under varying head conditions. Unvalved air relief piping may
					 lead to air entrainment in the sewage and will materially affect pump
					 efficiency and capacity. Air entrainment shall be considered accordingly by the
					 design consultant.
4. All pumps,
					 connections, shut-off valves, and check valves shall be located in a separate
					 vault either above or outside of the wet well, allowing accessibility to both
					 the wet well and pump/valve vault for inspection, maintenance, etc.
5. Access to the wet well shall not be
					 through a sealed vault. The dry well shall have a gas-tight seal when mounted
					 directly above the wet well.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 2 - Sewage Pump Stations › Section 9VAC25-790-440 - Force mains

Current through Register Vol. 40, No. 24, July 15, 2024
A. Capacity. The
					 minimum size of force mains shall be four inches in diameter, except for
					 grinder pumps and septic tank effluent (settled sewage) pumping systems, which
					 shall be provided with a minimum diameter of one inch.
1. At pumping capacity, a minimum
					 self-scouring velocity of two feet per second shall be maintained unless
					 provisions for flushing are made. A velocity of eight feet per second should
					 not be exceeded unless suitable construction methods are specified.
2. Air relief valves shall be placed at the
					 high points in the force main to relieve air locking and shall be periodically
					 exercised and maintained.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 3 - Sewage Treatment Works › Section 9VAC25-790-480 - Treatment works outfalls

Current through Register Vol. 40, No. 24, July 15, 2024
A. The
					 effluent discharge line or outfall shall be designed with sufficient capacity
					 to transmit the maximum expected flow in a manner so as to prevent flooding of
					 the treatment process while providing optimum dispersion of the treated
					 effluent into the receiving waters.
B. Velocity. The velocity in the outfall at
					 design average flow shall be a minimum of 1-1/2 feet per second to avoid any
					 settling of solids. Velocities should not exceed the recommendations of the
					 pipe manufacturer with respect to maximum velocities to avoid pipe erosion or
					 scour and should be less than eight feet per second to avoid excessive head
					 loss or disruption of the receiving water channel.
C. Structures. The outlet structure should be
					 submerged during design low flow conditions in the receiving water channel,
					 unless adequate dispersion can be achieved without such submergence. The outlet
					 structure should be designed to provide effective dispersion of effluent into
					 the receiving body of water as established by the certificate or permit issued.
					 Additional provisions for dispersion of effluent may be required, based on
					 public health and welfare protection and water quality considerations in
					 accordance with downstream uses.
1. The
					 outfall, where practicable, shall be of gravity sewer design and extend beyond
					 the design low water level of the receiving body of water and account for
					 coastal erosion if necessary. The effluent discharge shall remain submerged if
					 required to maintain water quality standards or protect public health and
					 welfare.
2. Headwalls may be used
					 where adequate dispersion will be obtained without requiring that the outfall
					 be submerged. The design shall include measures to prevent erosion and foaming
					 problems as a result of the discharge.
3. When a diffuser mechanism is provided, the
					 design shall take into account the range of current velocities and directions
					 in the vicinity of the diffuser.
Diffuser ports shall be spaced and located so as to avoid
						interference between adjacent jet plumes and sized so as to minimize head loss
						and maximize initial dispersion of the effluent into the receiving
						water.
Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 25 - STATE WATER CONTROL BOARD › Chapter 790 - VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM (VPDES) PERMIT REGULATION › Part III - Manual of Practice for Sewerage Systems and Treatment Works › Article 3 - Sewage Treatment Works › Section 9VAC25-790-490 - Reliability protection

Current through Register Vol. 40, No. 24, July 15, 2024
A.
					 Reliability is a measurement of the ability of a component or system to perform
					 its designated function without failure or interruption of service. Overflow
					 criteria, such as a period of discharge, are utilized solely for the
					 establishment of reliability classification for design purposes and are not to
					 be construed as authorization for or defense of an unpermitted discharge to
					 state waters. The treatment works design shall provide for satisfactory
					 operation during power failures, flooding, peak loads, equipment failure, and
					 maintenance shut-down (in accordance with the requirements of the appropriate
					 reliability class). Such design features include:
(i) additional electrical power sources;
(ii) additional flow storage
					 capacity; and
(iii) additional
					 treatment unit operations, that provide for alternate operation in accordance
					 with the issued certificate permit requirements.