Plan And Specification Review Dispute Resolution

The Department’s plan and specification review dispute resolution policy is set out in PS20-08 at https:// www.deq.idaho.gov. (3-31-22) 403. -- 408. (RESERVED) 409. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: DEMONSTRATION OF TECHNICAL, FINANCIAL, AND MANAGERIAL CAPACITY. No person shall proceed, or cause to proceed, with construction of a new public wastewater system, a new privat e municipal treatment plant, a new wastewater treatment facility, or a new privately owned wastewater pumping statio n until it has been demonstrated to the Department that the wastewater system will have adequate technical, financial , and managerial capacity, as defined in Section 010 of these rules. Demonstration of capacity shall be submitted to th e Department prior to or concurrent with the submittal of plans and specifications, as required in Section 39-118, Idah o Code, and Subsection 400.03 of these rules. The Department shall issue in writing its approval of the new syste m capacity demonstration. (3-31-22) 01. Technical Capacity. In order to meet this requirement, the public wastewater system shall submit documentation to demonstrate the following: (3-31-22) a. The system meets the relevant design, construction, and operating requirements of these rules; (3-31-22) b. A plan is in place to deal with emergencies; (3-31-22) c. A plan exists for replacement or improvement of infrastructure as necessary; and (3-31-22) d. The system has trained personnel with an understanding of the technical and operationa l characteristics of the system. (3-31-22) 02. Financial Capacity. A demonstration of financial capacity must include, but is not limited to, the following information: (3-31-22) a. Documentation that organizational and financial arrangements are adequate to construct and operate the wastewater system in accordance with these rules. This information can be provided by submittin g estimated construction, operation, and maintenance costs, letters of credit, or other access to financial capital throug h public or private sources and, if available, a certified financial statement; (3-31-22) b. Demonstration of revenue sufficiency, that includes, but is not limited to, billing and collectio n procedures; a proposed rate structure which demonstrates the availability of operating funds; revenues for depreciation and reserves; and the ability to accrue a capital replacement fund. A preliminary operating budget shall be provided; and (3-31-22) c. Adequate fiscal controls must be demonstrated. (3-31-22) d. For private municipal wastewater treatment plants, a performance bond, maintenance bond, or cash reserve of one (1) year of operation and maintenance costs is required to ensure continuous and adequate operatio n and maintenance. (3-31-22) 03. Managerial Capacity. In order to demonstrate adequate managerial capacity, the owner or operator of a new wastewater system shall submit at least the following information to the Department: (3-31-22) a. Clear documentation of legal ownership and any plans that may exist for transfer of that ownershi p upon completion of construction or after a period of operation; (3-31-22) b. The name, address, and telephone number of the person who will be accountable for ensuring tha t the wastewater system is in compliance with these rules; (3-31-22) c. The name, address, and telephone number of the responsible charge operator; (3-31-22) d. A description of the manner in which the wastewater system will be managed. Information such as by-laws, restrictive covenants, articles of incorporation, or procedures and policy manuals which describe th e management organizational structure shall be provided; (3-31-22) e. A recommendation of staff qualifications, including training, experience, certification or licensing , and continuing education; (3-31-22) f. An explanation of how the wastewater system will establish and maintain effectiv e communications and relationships between the wastewater system management, its customers, professional service providers, and any applicable regulatory agencies; and (3-31-22) g. Evidence of planning for future growth, equipment repair and maintenance, and long ter m replacement of system components. (3-31-22) 04. Consolidation. In demonstrating new system capacity, the owner of the proposed new system must investigate the feasibility of obtaining wastewater service from an established public wastewater system. If suc h service is available, but the owner elects to proceed with an independent system, the owner must explain why this choice is in the public interest in terms of environmental protection, affordability to wastewater users, and protectio n of public health. (3-31-22) 410. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: FACILITY PLANS. 01. Facility Plans Required. All new municipal wastewater treatment or disposal facilities, and al l existing municipal wastewater treatment or disposal facilities undergoing material modification or expansion, ar e required to have a current facility plan that shall address all applicable issues specifically required in Sections 410 an d 420 through 599 of these rules including, but not limited to, hydraulic capacity, treatment capacity, project financing , and operation and maintenance considerations. The facility plan shall address these issues sufficiently to determin e the effects of the project on the overall wastewater infrastructure. Material modification or expansion that requires a facility plan includes upgraded, or rehabilitated municipal wastewater treatment or disposal facilities and majo r collection, interceptor sewer, pump station projects, and septage transfer station projects. Facility plans must addres s the entire potential service area of the project. A facility plan may be completed for collection systems only. If such a collection system facility plan is prepared, and flows increase in excess of the design capacity of downstrea m collection and treatment facilities, the impact of the flow shall be addressed in the facility plan. (3-31-22) a. Department-reviewed simple wastewater main extension projects. A facility plan is not required i f the Department is provided documentation supporting the ability of the wastewater system to provide service for th e simple wastewater main extension without adding wastewater pumping stations or treatment capacity to the system and without overloading the existing collection system. Documentation may be in the form of: (3-31-22) i. Hydraulic modeling; (3-31-22) ii. Usage data and flow calculations; (3-31-22) iii. Declining balance reports that demonstrate the system has the capacity to supply the service area of the system served by the extension; or (3-31-22) iv. Other documentation acceptable to the Department. (3-31-22) b. QLPE-Reviewed Simple Wastewater Main Extension Projects. A Department-approved facilit y plan is not required to be in place prior to the QLPE approving simple wastewater main extensions pursuant t o Subsection 400.03.b., provided that the system is in compliance with the facility and design standards in the are a served by the extension. If the Department has not approved a facility plan which covers the proposed simpl e wastewater main extension, then the system owner or the QLPE must include with the transmittal lette r documentation supporting the ability of the system owner to provide service for the simple wastewater mai n extension without adding wastewater pumping stations or treatment capacity to the system and without overloadin g the existing collection system. The system owner shall provide this documentation to the QLPE as necessary . Documentation may be in the form of: (3-31-22) i. Hydraulic modeling; (3-31-22) ii. Usage data and flow calculations; (3-31-22) iii. Declining balance reports that demonstrate the system has the capacity to supply the service area of the system served by the extension; or (3-31-22) iv. Other documentation acceptable to the Department. (3-31-22) 02. Submittal to Department. Facility plans shall be submitted to the Department for review an d approval prior to the submission of plans and specifications for a project related to the facility plan. (3-31-22) 03. Engineer’s Seal Required. Facility plans submitted to the Department shall bear the imprint of a n Idaho licensed professional engineer’s seal that is both signed and dated by the engineer. (3-31-22) 04. Facility Plan Contents. The facility plan shall assemble basic information, present criteria an d assumptions, and examine alternative solutions with preliminary layouts and cost estimates. The facility plan i s intended to address system wide growth, to identify system deficiencies, and to lay out a plan for system upgrade s and expansion. The minimum requirements for a facility plan are located in Subsections 410.04.a. through 410.04.c . If specific items are not applicable to a particular facility plan, then the engineer shall state this in the facility plan an d state the reason why it is not applicable. (3-31-22) a. New Wastewater System Facility Plan. The facility plan for a new wastewater system must includ e sufficient detail to support the requirements of Sections 410 through 520 and address the items listed in Subsection s 410.04.a.i. through 410.04.a.vii. of this rule. (3-31-22) i. Location. Provide a general description and location of the system including service boundaries. (3-31-22) ii. Population. Provide the estimated design population of the system. (3-31-22) iii. Wastewater flows. Provide design data for domestic, commercial, and industrial wastewate r generation, including average day, maximum day, maximum month, or peak hour flows. (3-31-22) iv. Collection. Identify and describe any anticipated or proposed wastewater collection systems . Include specific detail on any anticipated or proposed wastewater pumping stations and on any anticipated o r proposed wastewater interceptor or trunk lines. (3-31-22) v. Treatment. Identify and describe any anticipated or proposed treatment works. Provide specifi c detail on the type and level of treatment and the required capacity of the treatment system. (3-31-22) vi. Disposal. Identify and describe any anticipated or proposed wastewater disposal system(s). Includ e specific information on the location and method of disposal and information on any existing disposal permits o r estimated timelines to obtain anticipated required permits. (3-31-22) vii. Drinking water. Describe the drinking water distribution system with reference to the relationship to existing or proposed wastewater structures which may affect the operation and location of the wastewater system. (3-31-22) b. Existing Wastewater System Facility Plan. The facility plan for an existing wastewater system mus t include sufficient detail to support the requirements of Sections 410 through 520, address all items in Subsection s 410.04.a.i. through 410.04.a.vii., and address all items in Subsections 410.04.b.i. through 410.04.b.viii. (3-31-22) i. Provide a hydraulic analysis of the collection system if requested by the Department. Any analysi s of an existing collection system shall be properly calibrated. The type and sophistication of the analysis shall b e dependent on the type of the system. (3-31-22) ii. Identify and evaluate problems or deficiencies related to the wastewater system. (3-31-22) iii. Identify the design capacity of existing facilities and the current operating flows. (3-31-22) iv. Describe financing options for projects identified in the facility plan. (3-31-22) v. Set forth anticipated charges for users. (3-31-22) vi. Review organizational and staffing requirements. (3-31-22) vii. Offer a project(s) recommendation for client consideration. (3-31-22) viii. Outline official actions and procedures to implement the project. (3-31-22) c. Wastewater System Facility Plan Funded by the State Revolving Fund. If the project is funded b y the state revolving fund or a state grant, the facility plan must meet the requirements of Subsections 410.04.a. an d 410.04.b., and other requirements that may also apply. See IDAPA 58.01.12 “Rules for Administration of Wate r Pollution Control Loans,” and IDAPA 58.01.04, “Rules for Administration of Wastewater Treatment Facilit y Grants.” (3-31-22) d. Facility Plan Guidance. A checklist which can be used for guidance can be found on the DE Q website at http://www.deq.idaho.gov. This checklist is for Department grant and loan projects, but may be used in part or in whole as a guide to assist in the development of any facility plan. (3-31-22) 411. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: PRELIMINARY ENGINEERING REPORTS. 01. Preliminary Engineering Reports Required. Preliminary engineering reports are required fo r municipal wastewater treatment or disposal facility projects that require plan and specification review and approva l pursuant to Subsection 400.03 and shall address all applicable issues specifically required in Sections 411 throug h 599 of these rules including, but not limited to, purpose, scope, hydraulic capacity, treatment capacity, and operatio n and maintenance considerations sufficiently to determine the effects of the project on the overall wastewate r infrastructure. Preliminary engineering reports must be completed for major wastewater collection system projects , all pump station projects, all treatment plant designs and upgrades, and all septage transfer stations. Preliminar y engineering reports are not required for simple wastewater main extensions that are approved in accordance with Subsections 410.01.a. or 410.01.b. (3-31-22) 02. Submittal to Reviewing Authority. Preliminary engineering reports shall be submitted to th e Department for review and must be approved by the Department prior to the submission of plans and specifications. (3-31-22) 03. Preliminary Engineering Report Contents. The preliminary engineering report must includ e sufficient detail to demonstrate that the proposed project meets applicable criteria. The preliminary engineering repor t generally addresses project specific issues rather than the overall system-wide plan. The preliminary engineerin g report shall identify and evaluate wastewater related problems; assemble basic information; present criteria an d assumptions; examine alternative solutions with preliminary layouts and cost estimates; offer a conclusion with a proposed project; and outline official actions and procedures to implement the project. The items included i n Subsections 411.03.a. through 411.03.c., and other items specifically called for in Sections 426 through 599, shall b e addressed in detail in the preliminary engineering report. If specific items are not applicable to a particular design , then the designer shall state this in the preliminary engineering report and state the reason why it is not applicable . Items adequately addressed in the facility plan under which the project is being designed, may be addressed b y reference for purposes of the preliminary engineering report. (3-31-22) a. Major Wastewater Collection System Projects. Items applicable to preliminary engineering report s for major wastewater collection system projects are listed in Subsections 411.03.a.i. through 411.03.a.vi. (3-31-22) i. Coordination with Facility Plan. The preliminary engineering report shall discuss or reference items provided in the Department-approved facility plan. These items include, but are not limited to: (3-31-22) (1) Location of project; (3-31-22) (2) Population served by project; (3-31-22) (3) Existing and proposed wastewater flows; (3-31-22) (4) Existing and proposed collection system; (3-31-22) (5) Existing and proposed treatment works; (3-31-22) (6) Existing and proposed disposal methods; (3-31-22) (7) Drinking water system impacts; (3-31-22) (8) Hydraulic analysis; and (3-31-22) (9) Financing methods. (3-31-22) ii. Design criteria. The preliminary engineering report shall discuss and present the design criteri a applicable to the proposed project. The design criteria includes, but is not limited to: (3-31-22) (1) Wastewater flow rates including peak hour flows; (3-31-22) (2) Current project fifty (50) year design and build-out conditions; (3-31-22) (3) Piping size, material, and installation methods; (3-31-22) (4) Depth of bury and slope; (3-31-22) (5) Soil and ground water conditions; (3-31-22) (6) Corrosion protection; and (3-31-22) (7) Odor control. (3-31-22) iii. Code provisions. The preliminary engineering report shall include a summary of applicable code s and standards that apply to the proposed project. (3-31-22) iv. Cost estimate. The preliminary engineering report shall provide as applicable estimate d construction costs for public works projects or projects funded by public monies. (3-31-22) v. Construction schedule. The preliminary engineering report shall include the proposed construction schedule. (3-31-22) vi. Environmental review. The preliminary engineering report shall include an environmental review. See the definition for environmental review in Section 010 for additional information. (3-31-22) b. Wastewater Pump Station Projects. Items applicable to preliminary engineering reports fo r wastewater pump station projects include all items listed in Subsection 411.03.a. and items listed in Subsection s 411.03.b.i. through 411.03.b.iv. (3-31-22) i. Design criteria. The preliminary engineering report shall discuss and present the design criteri a applicable to the proposed project. The design criteria includes, but is not limited to: (3-31-22) (1) Wastewater flow rates including average day, maximum day, and peak hour flows; (3-31-22) (2) Influent wastewater characteristics, including characteristics during periods of wet weather flows; (3-31-22) (3) Size and configuration; and (3-31-22) (4) Redundancy provisions. (3-31-22) ii. Site evaluation and layout. The preliminary engineering report shall describe the proposed site an d layout of the wastewater pumping station. This information includes, but is not limited to: (3-31-22) (1) Currently proposed facilities; (3-31-22) (2) Geotechnical investigation and provisions including buoyancy calculations if required; (3-31-22) (3) Flood control provisions; (3-31-22) (4) Security; (3-31-22) (5) Operations and maintenance assessments; and (3-31-22) (6) Odor management plans. (3-31-22) iii. Instrumentation and control system. The preliminary engineering report shall discus s instrumentation and control that will be provided. This information includes, but is not limited to: (3-31-22) (1) System configuration; (3-31-22) (2) Operator interface; (3-31-22) (3) Process and instrumentation diagrams; and (3-31-22) (4) Alarm systems. (3-31-22) iv. Emergency operation. The preliminary engineering report shall describe how the system will be operated during power outages, equipment failures, or other unforeseen system failures. (3-31-22) c. Wastewater Treatment Plants. Items applicable to preliminary engineering reports for wastewate r treatment plant designs and upgrades include all items listed in Subsection 411.03.a., Subsection 411.03.b., and Subsections 411.03.c.i. through 411.03.c.iv. (3-31-22) i. Design criteria. The preliminary engineering report shall discuss and present the design criteri a applicable to the proposed project. The design criteria includes, but is not limited to: (3-31-22) (1) Wastewater flow rates including average day, maximum day, maximum month, and peak hou r flows; (3-31-22) (2) Effluent requirements; (3-31-22) (3) Solids production, disposal, or recycling requirements; (3-31-22) (4) Process units design criteria, process selection, and support data; (3-31-22) (5) Mass balance calculations for process units including, but not limited to, flow and solids; and (3-31-22) (6) Monitoring and reporting requirements. (3-31-22) ii. Site evaluation and layout. The preliminary engineering report shall describe the proposed site an d layout of the wastewater system. This information includes, but is not limited to: (3-31-22) (1) Currently proposed facilities; (3-31-22) (2) Facilities for twenty (20) year design conditions; (3-31-22) (3) Facilities for build-out conditions; (3-31-22) (4) Space for facilities potentially necessary to meet higher levels of treatment; (3-31-22) (5) Liquid process facilities and conveyance; (3-31-22) (6) Solids process facilities and conveyance; (3-31-22) (7) Plant access and on-site roads and walkways; (3-31-22) (8) Process piping and utilities; (3-31-22) (9) Buffer zones; (3-31-22) (10) Landscaping; (3-31-22) (11) Administration and operations buildings; (3-31-22) (12) Onsite laboratory facilities; and (3-31-22) (13) Treatment during construction. (3-31-22) iii. Hydraulic profile. The preliminary engineering report shall provide a hydraulic profile for th e proposed system. This information includes, but is not limited to: (3-31-22) (1) Twenty (20) year design facilities; (3-31-22) (2) Provision for higher levels of treatment; (3-31-22) (3) Receiving stream one hundred (100) year surface water elevation; and (3-31-22) (4) Hydraulics and pipe sizing for build-out conditions. (3-31-22) iv. Process units. The preliminary engineering report shall describe in detail the proposed process unit s and discuss how the proposed units will interface with any existing process units. This information includes, but i s not limited to: (3-31-22) (1) Current project and twenty (20) year design and build-out conditions; (3-31-22) (2) Size and number of units and loading rates; (3-31-22) (3) Redundancy provisions; (3-31-22) (4) Equipment type, size, performance criteria, and power requirements; (3-31-22) (5) Structure, equipment, and piping layout; (3-31-22) (6) Special code requirements; (3-31-22) (7) Cold temperature operation; and (3-31-22) (8) Procedures required for initial start-up of process unit(s), including procedures required fo r handling initial system flows that are less than minimum flow requirements for the process unit(s). (3-31-22) 04. Engineer’s Seal Required. Preliminary engineering reports submitted to the Department shall bea r the imprint of an Idaho licensed professional engineer’s seal that is both signed and dated by the engineer. (3-31-22) 412. -- 419. (RESERVED) 420. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: SUBMISSION OF PLANS AND SUPPORT DOCUMENTS. Submissions to the reviewing authority for construction of municipal wastewater treatment or disposal facilities shal l include sealed plans and specifications, design criteria, the appropriate construction permit applications, revie w forms, and permit fee if required. The plans and specifications shall contain sufficient detail to allow for th e contracting and construction of the wastewater systems. (3-31-22) 421. -- 424. (RESERVED) 425. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: OPERATION AND MAINTENANCE MANUALS. 01. Manual Contents. An operation and maintenance manual or manuals shall be provided for al l wastewater systems. The manual shall include, but is not limited to, the following contents: daily operatin g instructions, operator safety procedures, location of valves and other key system features, a parts list and parts order form(s), and information for contacting the responsible charge operators. An operational trouble-shooting sectio n shall be supplied to the wastewater works as part of any proprietary unit installed in system facilities. (3-31-22) 02. Approval Required. Final operation and maintenance manuals for construction of wastewate r systems that include lift stations or treatment works must be submitted to the Department for review and approva l prior to start-up of the proposed system unless the system components are already covered in an existing manual. (3-31-22) 426. -- 429. (RESERVED) 430. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES -- DESIGN AND CONSTRUCTION OF WASTEWATER PIPELINES. 01. Design Capacity and Design Flow. In general, sewer capacities shall be designed for the estimate d ultimate tributary population, except in considering parts of the systems that can be readily increased in capacity. (3-31-22) 02. Details of Design and Construction. (3-31-22) a. Minimum Pipe Size. Minimum pipe size for gravity sewer mains shall be eight (8) inches i n diameter. Minimum pipe size for gravity sewer services shall be four (4) inches in diameter. Pipe diameters larger than these minimums shall be based on cleaning capability and hydraulic capacity, and shall conform with th e required planning documents. (3-31-22) b. Depth. Wastewater pipelines shall be installed sufficiently deep or specifically designed to preven t freezing and to protect the facilities from surface loading. (3-31-22) c. Buoyancy. Buoyancy of wastewater pipelines shall be considered and flotation of the pipe shall b e prevented with appropriate construction where high groundwater conditions are anticipated. (3-31-22) d. Slope. Gravity wastewater pipelines shall be designed to have sufficient slope and velocity to “sel f clean” or transport constituent solids to the treatment facility. Justification for these slopes shall be included in th e preliminary engineering report and shall be based on widely used guidance documents or published frictio n coefficients and Manning’s formula. (3-31-22) i. If the current or future ownership of the system is by a city, county, quasi-municipal corporation or regulated public utility and the velocities are less than self cleaning, the owner shall, as a condition of th e Department’s approval of plans and specifications, provide justification for the lower velocities and commit to, at a minimum, annually service wastewater pipelines to flush, transport, or remove solids from wastewater pipelines. Thi s would include the use of cutting tools for roots, vactor trucks, and any other method required to keep the pipeline s clean, intact and flowing. That commitment shall be in the form of a letter from both the owner and the future owne r entity stating said commitment, and shall include a discussion of the current and future owners’ capacity to do sai d flushing. (3-31-22) ii. If the current or future ownership of the system is by a developer that is passing the operation an d maintenance on to a homeowner’s association or other similar entity, then the design shall not allow for velocities tha t are less than self cleaning. (3-31-22) e. Materials. (3-31-22) i. Any generally accepted material for wastewater pipelines will be given consideration. The materia l selected should be adapted to local conditions, such as: character of industrial wastes, possibility of septicity, soi l characteristics, exceptionally heavy external loadings, abrasion, corrosion, and similar problems. (3-31-22) ii. Couplings complying with applicable standard specifications shall be used for joining dissimila r materials. (3-31-22) iii. For new pipe materials for which standards have not been established, the design engineer shal l provide complete pipe specifications and installation specifications developed on the basis of criteria adequatel y documented and certified in writing by the pipe manufacturer to be satisfactory for the specific application.(3-31-22) f. Installation. Installation specifications shall contain appropriate requirements based on the criteria , standards, and requirements established by industry in its technical publications. Reference current edition of th e Idaho Standards for Public Works Construction for assistance in designing such specifications. (3-31-22) g. Joints and Infiltration. (3-31-22) i. The installation of joints and the materials used shall be included in the specifications. Wastewate r pipeline joints shall be designed to minimize infiltration and to prevent the entrance of roots throughout the life of th e system. Reference current edition of the Idaho Standards for Public Works Construction for assistance in designin g such specifications. (3-31-22) ii. Service connections to the wastewater pipeline main shall be water tight and not protrude into th e wastewater pipelines. If a saddle type connection is used, it shall be a device designed to join with the types of pip e which are to be connected. All materials used to make service connections shall be compatible with each other an d with the pipe materials to be joined and shall be corrosion proof. (3-31-22) h. Manholes. Manholes shall be installed at the end of each line; at all changes in grade, size, o r alignment; at all intersections. Cleanouts may be used only for special conditions and shall not be substituted fo r manholes nor installed at the end of laterals greater than one hundred fifty (150) feet in length. (3-31-22) i. Testing. Testing shall conform with Section 501.3.4 of the “Idaho Standards for Public Work s Construction,” incorporated by reference into these rules at Section 004. (3-31-22) j. Inverted Siphons. Inverted siphons shall have not less than two (2) barrels or pipes. They shall b e provided with necessary appurtenances for maintenance, convenient flushing, and cleaning equipment. Design shal l provide sufficient head and appropriate pipe sizes to secure sufficient velocities for design average flows. (3-31-22) k. Wastewater Pipelines in Relation to Surface Water Bodies. The top of all wastewater pipeline s entering or crossing surface water bodies shall be at a sufficient depth below the natural bottom of the bed o r otherwise designed to protect the wastewater pipeline. (3-31-22) i. Wastewater pipelines located adjacent to surface water bodies shall be located outside of the bed and sufficiently removed therefrom to provide for future possible stream widening and to prevent pollution b y siltation during construction. (3-31-22) ii. Structures. Wastewater pipeline outfalls, headwalls, manholes, gate boxes, or other structures shal l be designed to address anticipated flood flows of the surface water bodies. (3-31-22) iii. Alignment. Wastewater pipelines crossing surface water bodies should be designed to cross the surface water body as nearly perpendicular to the surface water body flow as possible and shall be free from chang e in grade. (3-31-22) iv. Materials. Wastewater pipelines entering or crossing surface water bodies shall be constructed o f water transmission pressure rated pipe with restrained joints conforming to Section 401.2.9 of the “Idaho Standard s for Public Works Construction,” incorporated by reference into these rules at Section 004, or other suitable pipe wit h restrained joints capable of being installed to remain watertight and free from changes in alignment or grade. Materia l used to back-fill the trench shall be concrete slurry, stone, coarse aggregate, washed gravel, or other materials whic h will not readily erode, cause siltation, damage pipe during placement, or corrode the pipe. (3-31-22) v. Siltation and Erosion. Construction methods that will minimize siltation and erosion shall be employed. (3-31-22) l. Aerial Crossings. Support shall be provided for all joints in pipes utilized for aerial crossings . Restrained joints or structural casings are required. (3-31-22) m. Cross Connections Prohibited. There shall be no physical connections between a public or privat e potable water supply system and a wastewater pipeline, or appurtenance thereto, which would permit the passage o f any wastewater or polluted water into the potable supply. No water pipe shall pass through or come into contact wit h any part of a wastewater pipeline manhole. (3-31-22) n. Protection of Water Sources, Supplies. When wastewater pipelines are proposed in the vicinity o f any drinking water sources or supplies or other drinking water facilities, requirements of IDAPA 58.01.08, “Idah o Rules for Public Drinking Water Systems,” shall be used to confirm acceptable isolation distances. (3-31-22) o. Non-Potable Pipelines in Relation to Potable Water Pipelines. The Department will use th e Memorandum of Understanding with the Plumbing Bureau as guidance in determining the relative responsibilities fo r reviewing service lines. The conditions of Subsections 430.02.o.i. and 430.02.o.ii. shall apply to all potable service s constructed or reconstructed after April 15, 2007 and where the Department or the QLPE is the reviewing authority. (3-31-22) i. Parallel installation requirements. (3-31-22) (1) Non-potable mains in relation to potable mains: (3-31-22) (a) Greater than ten (10) feet separation: no additional requirements based on separation distance. (3-31-22) (b) Ten (10) feet to six (6) feet separation: separate trenches, with potable main above non-potabl e main, and non-potable main constructed with potable-water class pipe. (3-31-22) (c) Less than six (6) feet separation: design engineer to submit data to the Department for review an d approval that this installation will protect public health and environment and non-potable main constructed wit h potable-water class pipe. (3-31-22) (d) Non-potable mains are prohibited from being located in the same trench as potable mains. (3-31-22) (e) Pressure sewage mains shall be no closer horizontally than ten (10) feet from potable mains. (3-31-22) (2) New non-potable services in relation to potable services, new non-potable services in relation t o potable mains, and new potable services in relation to non-potable mains. (3-31-22) (a) Greater than six (6) feet separation: no additional requirements based on separation distances. (3-31-22) (b) Less than six (6) feet separation: design engineer to submit data that this installation will protec t public health and the environment and non-potable service constructed with potable water class pipe. (3-31-22) (c) New potable services are prohibited from being located in the same trench as non-potable mains o r non-potable services. (3-31-22) ii. Requirements for potable water mains or services crossing non-potable mains or services. For th e purposes of Subsection 430.02.o.ii., the term “pipeline” applies to both mains and services. (3-31-22) (1) Eighteen (18) inches or more vertical separation with potable pipeline above non-potable pipeline : non-potable pipeline joint to be as far as possible from the potable water pipeline. (3-31-22) (2) Eighteen (18) inches or more vertical separation with potable water pipeline below non-potabl e pipeline: Non-potable pipeline joint to be as far as possible from the potable water pipeline, and non-potable pipelin e must be supported through the crossing to prevent settling. (3-31-22) (3) Less than eighteen (18) inches vertical separation: (3-31-22) (a) Non-potable pipeline joint to be as far as possible from the potable water pipeline; and either (3-31-22) (b) Non-potable pipeline constructed with potable water class pipe for a minimum of ten (10) fee t either side of potable pipeline with a single twenty (20) foot section of potable water class pipe centered on th e crossing; or (3-31-22) (c) Sleeve non-potable or potable pipeline with potable water class pipe for ten (10) feet either side o f crossing. Use of hydraulic cementitious materials such as concrete, controlled density fill, and concrete slurr y encasement is not allowed as a substitute for sleeving. (3-31-22) (d) If the potable pipeline is below non-potable pipeline, the non-potable pipeline must also b e supported through the crossing to prevent settling. (3-31-22) (4) Pressure sewage mains shall be no closer vertically than eighteen (18) inches from potable mains. (3-31-22) iii. Existing potable services in relation to new non-potable mains, existing non-potable services i n relation to new potable mains, and existing potable services in relation to new non-potable services shall meet th e requirements of Subsection 430.02.o.ii., where practical, based on cost, construction factors, and public healt h significance. If the Department determines that there are significant health concerns with these services, such a s where a large existing service serves an apartment building or a shopping center, then the design shall conform wit h Subsection 430.02.o.ii. (3-31-22) 431. -- 439. (RESERVED) 440. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: WASTEWATER PUMPING STATIONS. 01. General. Section 440 regulates both public and private municipal wastewater collection pum p stations and does not regulate individual residence pump stations, individual residence grinder pump stations, o r individual residence septic tank effluent pump stations. See Section 441 for regulation of those types of pum p stations. (3-31-22) a. Flooding. Wastewater pumping station structures and electrical and mechanical equipment shall b e protected from physical damage by the one hundred (100) year flood. Wastewater pumping stations shall remain full y operational and accessible during the twenty-five (25) year flood. Regulations of state and federal agencies regarding flood plain obstructions shall be considered. (3-31-22) b. Accessibility and Security. The pumping station shall be accessible by maintenance vehicles durin g all weather conditions. (3-31-22) c. Grit. The wet well and pump station piping shall be designed to avoid operational problems fro m the accumulation of grit. (3-31-22) d. Safety. Provisions shall be made to consider the protection of maintenance personnel and visitor s from typical and foreseeable hazards in accordance with the engineering standards of care. See also Subsectio n 450.07. (3-31-22) 02. Design. Design of wastewater pumping stations shall meet the applicable requirements o f Subsections 440.02.a. through 440.02.i. (3-31-22) a. Type. Wastewater pumping stations in general use fall into four types: wet well/dry well, submersible, suction lift, and screw pump. (3-31-22) b. Structures. (3-31-22) i. Separation. Dry wells shall be completely separated from the wet well. Common walls must be ga s tight. (3-31-22) ii. Equipment Removal. Provision shall be made to facilitate removing pumps, motors, and othe r mechanical and electrical equipment. Individual pump and motor removal must not interfere with the continue d operation of remaining pumps. (3-31-22) iii. Access and Safety Landings. (3-31-22) (1) Access. Suitable means of access for maintenance personnel wearing self-contained breathin g apparatus shall be provided to dry wells and to wet wells. See also Subsection 450.07. (3-31-22) (2) Safety Landings. Section 009 provides a reference to requirements of the Occupational Safety an d Health Administration (OSHA), compliance with which may be required by other law. (3-31-22) iv. Buoyancy. Where high groundwater conditions are anticipated, buoyancy of the wastewate r pumping station structures shall be considered and, if necessary, adequate provisions shall be made for protection. (3-31-22) v. Construction Materials. Materials shall be selected that are appropriate under conditions o f exposure to hydrogen sulfide and other corrosive gases, greases, oils, and other constituents frequently present i n wastewater. This is particularly important in the selection of metals and paints. (3-31-22) c. Pumps. (3-31-22) i. Multiple Units. Multiple pumps shall be provided. Units shall have capacity such that, with an y unit out of service, the remaining units will have capacity to handle the design peak hourly flow. (3-31-22) ii. Protection Against Clogging. Pumps (except screw pumps) handling separate sanitary wastewate r from thirty (30) inch or larger diameter sewers shall be protected by bar racks. Appropriate protection from clogging shall also be considered for small pumping stations. (3-31-22) iii. Pump Openings. Pumps handling unscreened raw wastewater shall be capable of passing spheres of at least three (3) inches in diameter or be a grinder pump. (3-31-22) iv. Priming. The pump shall be placed so that, under normal operating conditions, it will operate unde r a positive suction head, except as specified in Subsection 440.03. (3-31-22) v. Electrical Equipment. Section 009 provides a reference to the requirements of the Nationa l Electrical Code, compliance with which may be required by other law. (3-31-22) vi. Intake. Section 008 provides a reference to the American National Standard Institute/Hydrauli c Institute ANSI/HI 9.8, American National Standard for Centrifugal and Vertical Pump Intake Design. (3-31-22) vii. Dry Well Dewatering. Dry wells shall be equipped with a positive means for dewatering.(3-31-22) viii. Pumping Rates. The pumps and controls of main pumping stations shall be selected to operate wit h varying rates. The pump control system design shall take into account, and minimize as needed, downstream impact of pump discharge hydraulic surges. The station design capacity shall be based on peak hourly flow as determined i n accordance with Section 411 and shall be adequate to maintain a velocity in the force main sufficient to avoid solid s deposition. See Subsection 440.09. (3-31-22) d. Controls. Water level control sensing devices shall be designed to allow for automatic control o f pumps. (3-31-22) e. Valves. (3-31-22) i. Suction Line. Suitable shutoff valves shall be placed on the suction lines of dry pit pumps. (3-31-22) ii. Discharge Line. Suitable shutoff and check valves shall be placed on the discharge line of eac h pump (except on screw pumps). The check valve shall be located between the shutoff valve and the pump. Chec k valves shall be suitable for the material being handled and shall be placed on the horizontal portion of the discharg e piping except for ball checks, which may be placed in the vertical run. Valves shall be capable of withstanding norma l pressure and water hammer. All shutoff and check valves shall be operable from the floor level and accessible fo r maintenance. Outside levers are recommended on swing check valves. (3-31-22) f. Wet Wells. (3-31-22) i. Section 008 provides a reference to the American National Standard Institute/Hydraulic Institut e ANSI/HI 9.8, American National Standard for Centrifugal and Vertical Pump Intake Design as a guidance document. (3-31-22) ii. Air Displacement. Covered wet wells shall have provisions for air displacement to the atmosphere, such as an inverted “j” tube or other means. (3-31-22) g. Safety Ventilation. Adequate ventilation shall be provided for all pump stations unless access i s provided using confined space entry procedures. Where the dry well is below the ground surface, mechanical ventilation is required. If screens or mechanical equipment requiring maintenance or inspection are located in the we t well, permanently installed ventilation is required. There shall be no interconnection between the wet well and dr y well ventilation systems. Section 008 provides a reference to guidance documents; see Subsection 008.11. (3-31-22) h. Flow Measurement. Suitable methods for measuring wastewater flow shall be addressed at al l pumping stations. (3-31-22) i. Water Supply. There shall be no physical connection between any potable water supply and a wastewater pumping station which, under any conditions, might cause contamination of the potable water supply. If a potable water supply connection is made to the station, the connection shall comply with IDAPA 58.01.08, “Idah o Rules for Public Drinking Water Systems.” (3-31-22) 03. Suction Lift Pump Stations - Special Considerations. Suction lift pumps shall meet the applicable requirements of Subsection 440.02. (3-31-22) a. Pump Priming and Lift Requirements. Suction lift pumps shall be of the self-priming or vacuum- priming type. Suction lift pump stations using dynamic suction lifts exceeding the limits outlined in Subsection s 440.03.b. through 440.03.d. may be approved upon submission of factory certification of pump performance an d detailed calculations indicating satisfactory performance under the proposed operating conditions. (3-31-22) b. Self-Priming Pumps. Self-priming pumps shall be capable of rapid priming and re-priming at th e “lead pump on” elevation. Such self-priming and re-priming shall be accomplished automatically under desig n operating conditions. (3-31-22) c. Vacuum-Priming Pumps. Vacuum-priming pump stations shall be equipped with dual vacuu m pumps capable of automatically and completely removing air from the suction lift pump. The vacuum pumps shall b e adequately protected from damage due to wastewater. The combined total of dynamic suction lift at the “pump off ’ elevation and required net positive suction head at design operating conditions shall not exceed twenty-two (22) feet. (3-31-22) d. Equipment, Wet Well Access, and Valving Location. The pump equipment compartment shall b e above grade or offset and shall be effectively isolated from the wet well to prevent a hazardous and corrosive sewe r atmosphere from entering the equipment compartment. Wet well access shall not be through the equipment compartment and shall be at least twenty-four (24) inches in diameter. Gasketed replacement plates shall be provide d to cover the opening to the wet well for pump units removed for servicing. Valving shall not be located in the we t well. (3-31-22) 04. Submersible Pump Stations - Special Considerations. Submersible pump stations shall meet th e applicable requirements of Subsection 440.02, except as modified in Subsection 440.04. (3-31-22) a. Construction. Submersible pumps and motors shall be designed specifically for raw wastewater use, including totally submerged operation during a portion of each pumping cycle. An effective method to detec t shaft seal failure or potential seal failure shall be provided. (3-31-22) b. Pump Removal. Submersible pumps shall be readily removable and replaceable without personne l entering or dewatering the wet well, or disconnecting any piping in the wet well. (3-31-22) c. Electrical Equipment. Section 009 provides a reference to the requirements of the Nationa l Electrical Code, compliance with which may be required by other law. (3-31-22) i. Power Supply and Control Circuitry. Electrical supply, control, and alarm circuits shall be designe d to provide strain relief and to allow disconnection from outside the wet well. Terminals and connectors shall b e protected from corrosion by location outside the wet well or through use of watertight seals. (3-31-22) ii. Controls. The motor control center shall be located outside the wet well, be readily accessible, and be protected by a conduit seal or other appropriate measures to prevent the atmosphere of the wet well from gaining access to the control center. The seal shall be located so that the motor may be removed and electrically disconnecte d without disturbing the seal. When such equipment is exposed to weather, it is recommended that it meet th e requirements of weatherproof equipment NEMA 3R or 4. (3-31-22) iii. Power Cord. Pump motor power cords shall be designed for flexibility and serviceability unde r conditions of extra hard usage. Ground fault interruption protection shall be used to de-energize the circuit in th e event of any failure in the electrical integrity of the cable. Power cord terminal fittings shall be corrosion-resistant an d constructed in a manner to prevent the entry of moisture into the cable, shall be provided with strain relie f appurtenances, and shall be designed to facilitate field connecting. (3-31-22) d. Valves. Valves required under Subsection 440.02 shall be located in a separate valve chamber. Provisions shall be made to remove or drain accumulated water from the valve chamber. The valve chamber may b e dewatered to the wet well through a drain line with a gas and water tight valve. Check valves that are integral to th e pump need not be located in a separate valve chamber provided that the valve can be removed from the wet well in accordance with Subsection 440.04. Access shall be provided in accordance with Subsection 440.02. (3-31-22) 05. Screw Pump Stations - Special Considerations. Screw pump stations shall meet the applicabl e requirements of Subsection 440.02. (3-31-22) a. Covers. Covers or other means of excluding direct sunlight shall be provided as necessary t o eliminate adverse effects from temperature changes. (3-31-22) b. Pump Wells. A positive means of isolating individual screw pump wells shall be provided. (3-31-22) c. Bearings. Submerged bearings shall be lubricated by an automated system without pump wel l dewatering. (3-31-22) 06. Alarm Systems. Alarm systems with a backup power source shall be provided for pumpin g stations. The alarm shall be activated in cases of power failure, dry well sump and wet well high water levels, pum p failure, unauthorized entry, or other cause of pump station malfunction. Pumping station alarms, includin g identification of the alarm condition, shall be transmitted to a twenty-four (24) hour response center. Audio-visual alarm systems may be acceptable in some cases in lieu of a transmitting system depending upon location, statio n holding capacity, and inspection frequency. (3-31-22) 07. Emergency Operation. (3-31-22) a. Objective. The objective of emergency operation is to prevent the unintended discharge of raw o r partially treated wastewater to any waters or land surface and to protect public health by preventing back up o f wastewater and subsequent discharge to basements, streets, and other public and private property. (3-31-22) b. Emergency Pumping Capability. Emergency pumping capability is required for all new lift station s constructed after April 15, 2007. Emergency pumping capability is required for all existing lift stations that undergo a material modification or expansion unless overall system reliability can be proven adequate to the Department a s shown in Subsections 440.07.b.i. and 440.07.b.ii. or overflow prevention is provided by adequate emergency storag e capacity as defined in these rules. If required, emergency pumping capability shall be accomplished by connection o f the station to at least two (2) independent utility substations as determined by and stated in a letter from th e appropriate power provider, by provision of portable or in-place internal combustion engine equipment which wil l generate electrical or mechanical energy, or by the provision of portable pumping equipment. Such emergency standby systems shall have sufficient capacity to start up and maintain the total rated running capacity of the station . Regardless of the type of emergency standby system provided, a portable pump connection to the force main wit h rapid connection capabilities and appropriate valving shall be provided outside the dry well and wet well. (3-31-22) i. System reliability is considered adequate if power grid outages average three (3) or less per yea r based on data for the three (3) previous years with no more than six (6) outages in a single year. (3-31-22) ii. Outage duration averages less than four (4) hours based on data for the three (3) previous years , with not more than one (1) outage during the three (3) previous year period exceeding eight (8) hours. Power loss for at least thirty (30) minutes qualifies as an outage. (3-31-22) c. Equipment Requirements. (3-31-22) i. General. The following general requirements shall apply to all internal combustion engines used t o drive auxiliary pumps, service pumps through special drives, or electrical generating equipment: (3-31-22) (1) Engine Protection. The engine must be protected from operating conditions that would result i n damage to equipment. Unless continuous manual supervision is planned, protective equipment shall be capable of shutting down the engine and activating an alarm on site and as provided in Subsection 440.06. Protective equipmen t shall monitor for conditions of low oil pressure and overheating, except that oil pressure monitoring will not b e required for engines with splash lubrication. (3-31-22) (2) Size. The engine shall have adequate rated power to start and continuously operate under al l connected loads. (3-31-22) (3) Fuel Type. Reliability and ease of starting, especially during cold weather conditions, shall b e addressed in the selection of the type of fuel. (3-31-22) (4) Fuel Storage. Fuel storage and piping facilities if provided shall be constructed in accordance wit h applicable state and federal regulations. (3-31-22) (5) Engine Ventilation. The engine shall have adequate ventilation of fuel vapors and exhaust gases. (3-31-22) (6) Routine Start-up. All emergency equipment shall be provided with instructions indicating the nee d for regular starting and running of such units at full loads. (3-31-22) (7) Protection of Equipment. Emergency equipment shall be protected from damage at the restoratio n of regular electrical power. (3-31-22) ii. Engine-Driven Pumping Equipment. Where permanently-installed or portable engine-drive n pumps are used, the following requirements in addition to general requirements shall apply. (3-31-22) (1) Pumping Capacity. Engine-driven pumps shall meet the design pumping requirements unles s storage capacity is available for flows in excess of pump capacity. Pumps shall be designed for anticipated operatin g conditions, including suction lift if applicable. (3-31-22) (2) Operation. The engine and pump shall be equipped to provide automatic start-up and operation o f pumping equipment unless manual start-up and operation is justified. Provisions shall also be made for manual start- up. Where manual start-up and operation is justified, storage capacity and alarm system must meet the requirement s of Subsection 440.07.c.ii(3). (3-31-22) (3) Portable Pumping Equipment. Where part or all of the engine-driven pumping equipment i s portable, adequate emergency storage capacity with alarm system shall be provided to allow time for detection o f pump station failure and transportation and hookup of the portable equipment. (3-31-22) iii. Engine-Driven Generating Equipment. Where permanently-installed or portable engine-drive n generating equipment is used, the following requirements shall apply in addition to the general requirements o f Subsection 440.07. (3-31-22) (1) Generating Capacity. (3-31-22) (a) Generating unit size shall be adequate to provide power for pump motor starting current and fo r lighting, ventilation, and other auxiliary equipment necessary for safety and proper operation of the lift station. (3-31-22) (b) The operation of only one pump during periods of auxiliary power supply must be justified. Suc h justification may be made on the basis of the design peak hourly flows relative to single-pump capacity, anticipate d length of power outage, and storage capacity. (3-31-22) (c) Manual or special sequencing controls shall be provided to start pump motors unless the generatin g equipment has capacity to start all pumps simultaneously with auxiliary equipment operating. (3-31-22) (2) Operation. Provisions shall be made for automatic and manual startup and load transfer unless onl y manual start-up and operation is justified. Automatic transfer switches shall be UL listed and meet NEC requirements. The generator must be protected from operating conditions that would result in damage to equipment . Provisions shall be made to allow the engine to start and stabilize at operating speed before assuming the load. Wher e manual start-up and transfer is justified, storage capacity and alarm system must meet the requirements of Subsectio n 440.07.c.iii.(3). (3-31-22) (3) Portable Generating Equipment. Where portable generating equipment and manual transfer is provided, adequate emergency storage capacity with alarm system shall be provided to allow time for detection o f pump station failure and transportation and connection of generating equipment. Special electrical connections an d double throw switches shall be provided for connecting portable generating equipment. Manual transfer switche s shall be UL listed and meet NEC requirements. (3-31-22) iv. Independent Utility Substations. Where independent substations are used for emergency power , each separate substation and its associated transmission lines shall be capable of starting and operating the pum p station at its rated capacity. (3-31-22) 08. Instructions and Equipment. Wastewater pumping stations and portable equipment shall b e supplied with a complete set of operational instructions, including emergency procedures, maintenance schedules , tools, and such spare parts as may be necessary. (3-31-22) 09. Operation and Maintenance. (3-31-22) a. An operation and maintenance manual shall be submitted to and approved by the Department a s required by Section 425. Adherence to the terms of this approved manual shall be required. The owner shall b e responsible for maintaining the wastewater facility in a manner that assures its designed operation. (3-31-22) b. For private municipal wastewater collection pump stations, documents that detail the technical , managerial, and financial capabilities of the private entity to properly operate and maintain said pump station for th e long term shall be submitted to the Department for approval prior to operation. (3-31-22) 10. Force Mains. (3-31-22) a. Velocity and Diameter. At design pumping rates, a cleansing velocity of at least two (2) feet pe r second shall be maintained. (3-31-22) b. Air and Vacuum Relief Valve. An air relief valve shall be placed at high points in the force main to prevent air locking. The force main configuration and head conditions shall be evaluated as to the need for and placement of vacuum relief valves. (3-31-22) c. Termination. The force mains from other than individual grinder pump stations shall enter a receiving manhole. Corrosion protection for the receiving manhole shall be provided. Control of odors at suc h discharge points shall be evaluated. (3-31-22) d. Pipe and Design Pressure. Pipe and joints shall be equal to water main strength materials suitable for design conditions. The force main, reaction blocking, thrust restraint, and station piping shall be designed t o withstand water hammer pressures and associated cyclic reversal of stresses that are expected with the cycling o f wastewater lift stations. The use of surge valves, surge tanks, or other suitable means to protect the force main agains t severe pressure changes shall be evaluated. (3-31-22) e. Special Construction. Force main construction near streams or water works structures and at wate r main crossings shall meet applicable provisions of Section 430. (3-31-22) f. Design Friction Losses. (3-31-22) i. Friction Coefficient. Friction losses through force mains shall be based on the Hazen and William s formula or other acceptable methods. When the Hazen and Williams formula is used, the friction losses for varyin g values of “C” shall be evaluated for different types and ages of pipe. (3-31-22) ii. Maximum Power Requirements. When initially installed, force mains will have a significantl y higher “C” factor. The effect of the higher “C” factor shall be considered in calculating maximum power requirements and duty cycle time to prevent damage to the motor. The effects of higher discharge rates on selected pumps and downstream facilities shall also be considered. (3-31-22) g. Identification. Where force mains are constructed of material which might cause the force main t o be confused with potable water mains, the force main shall be appropriately identified using trench tape saying “ra w sewage,” “biohazard,” or other appropriate wording. (3-31-22) h. Leakage Testing. Leakage tests shall be specified including testing methods and leakage limits . Testing shall conform with Sections 401.3.6 and 505.3.3 of the “Idaho Standards for Public Works Construction, ” incorporated by reference into these rules at Section 004. (3-31-22) i. Thrust Blocking or Restraint. Thrust blocking or restraint shall conform with Sections 401.3.4 o f the “Idaho Standards for Public Works Construction,” incorporated by reference into these rules at Section 004, o r specific calculations reviewed and approved by the Department. (3-31-22) j. Maintenance Considerations. Isolation valves shall be used if force mains connect into a commo n force main. (3-31-22) k. Cover. Force mains shall be covered with sufficient earth or other insulation to prevent freezing o r other physical damage. (3-31-22) 441. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: INDIVIDUAL RESIDENCE WASTEWATER PUMPING STATIONS. 01. General. Section 441 regulates individual residence pump stations, individual residence grinde r pump stations, and individual residence septic tank effluent pump stations. However, this rule does not regulat e grinder pumps or their vaults that are inside of individual residences or other structures. Certain individual residenc e wastewater pumping stations may be under the jurisdiction of the Idaho Division of Building Safety, Plumbin g Bureau. For further defining and delineating of the Plumbing Bureau’s and the Department’s statutory and regulator y duties and responsibilities with respect to individual residence wastewater pumping stations, see the Memorandum of Understanding referred to in Section 008. (3-31-22) a. Flooding. Wastewater pumping station structures and electrical and mechanical equipment shall b e protected from physical damage by the one hundred (100) year flood. Wastewater pumping stations shall remain full y operational and accessible during the twenty-five (25) year flood. Local, state and federal flood plain regulations shal l be considered. (3-31-22) b. Accessibility and Security. The pumping station shall be accessible by maintenance vehicles durin g all weather conditions. (3-31-22) 02. Design. Design of wastewater pumping stations shall meet the applicable requirements o f Subsections 441.02.a. through 441.02.c. (3-31-22) a. Pumps. (3-31-22) i. Multiple Units. Duplex pumps for individual residence wastewater pump stations are not required . However, for developments having five (5) or more similar facilities, one (1) working spare pump for each size shal l be provided and be readily available at all times. (3-31-22) ii. Pump Openings. Pumps handling raw wastewater shall be capable of passing spheres of at leas t three (3) inches in diameter or be a grinder pump. (3-31-22) iii. Priming. The pump shall be placed so that, under normal operating conditions, it will operate unde r a positive suction head. (3-31-22) b. Controls. Water level control sensing devices shall be designed to allow for automatic control o f pumps. (3-31-22) c. Valves. Suitable means to facilitate pump removal and to prevent backflow shall be provided. Al l shutoff and check valves shall be accessible for maintenance. (3-31-22) 03. Submersible Pump Stations - Special Considerations. (3-31-22) a. Construction. Submersible pumps and motors shall be designed specifically for raw wastewater use, including totally submerged operation during a portion of each pumping cycle. An effective method to detec t shaft seal failure or potential seal failure shall be provided. (3-31-22) b. Pump Removal. Submersible pumps shall be readily removable and replaceable without personne l entering or dewatering the wet well, or disconnecting any piping in the wet well. (3-31-22) c. Electrical Equipment. Section 009 provides a reference to the requirements of the Nationa l Electrical Code, compliance with which may be required by other law. (3-31-22) i. Power Supply and Control Circuitry. Electrical supply, control, and alarm circuits shall be designe d to provide strain relief and to allow disconnection from outside the wet well. Terminals and connectors shall b e protected from corrosion by location outside the wet well or through use of watertight seals. (3-31-22) ii. Controls. The motor control center shall be located outside the wet well, be readily accessible, and be protected by a conduit seal or other appropriate measures to prevent the atmosphere of the wet well from gaining access to the control center. The seal shall be located so that the motor may be removed and electrically disconnecte d without disturbing the seal. When such equipment is exposed to weather, it is recommended that it meet th e requirements of weatherproof equipment NEMA 3R or 4. (3-31-22) iii. Power Cord. Pump motor power cords shall be designed for flexibility and serviceability unde r conditions of extra hard usage. Ground fault interruption protection shall be used to de-energize the circuit in th e event of any failure in the electrical integrity of the cable. Power cord terminal fittings shall be corrosion-resistant an d constructed in a manner to prevent the entry of moisture into the cable, shall be provided with strain relie f appurtenances, and shall be designed to facilitate field connecting. (3-31-22) 04. Alarm Systems. Audio-visual alarm systems with a backup power source shall be provided fo r pumping stations. The alarm shall be activated in cases of wet well high water levels and shall be visible from th e outside of the structure. (3-31-22) 05. Emergency Operation. The pumping station must be sized to allow for one (1) day’s flow betwee n the high water alarm and the building service invert or the pressure discharge pipe, whichever is closer to the high water alarm. (3-31-22) 06. Instructions and Equipment. Wastewater pumping stations shall be supplied with a complete se t of operational instructions, including emergency procedures, maintenance schedules, tools, and such spare parts a s may be necessary. (3-31-22) 07. Operation and Maintenance. An operation and maintenance manual shall be submitted to an d approved by the Department as required by Section 425. Adherence to the terms of this approved manual shall be required. The owner shall be responsible for maintaining the wastewater facility in a manner that assures its designe d operation. (3-31-22) 08. Force Mains. (3-31-22) a. Velocity and Diameter. At design pumping rates, a cleansing velocity of at least two (2) feet pe r second shall be maintained. (3-31-22) b. Special Construction. Force main construction near streams or water works structures and at wate r main crossings shall meet applicable provisions of Section 430. (3-31-22) c. Design Friction Losses. (3-31-22) i. Friction Coefficient. Friction losses through force mains shall be based on the Hazen and William s formula or other acceptable methods. When the Hazen and Williams formula is used, the friction losses for varyin g values of “C” shall be evaluated for different types and ages of pipe. (3-31-22) ii. Maximum Power Requirements. When initially installed, force mains will have a significantl y higher “C” factor. The effect of the higher “C” factor shall be considered in calculating maximum power requirements and duty cycle time to prevent damage to the motor. The effects of higher discharge rates on selected pumps and downstream facilities shall also be considered. (3-31-22) d. Identification. Where force mains are constructed of material which might cause the force main t o be confused with potable water mains, the force main shall be appropriately identified using trench tape saying “ra w sewage,” “biohazard,” or other appropriate wording. (3-31-22) e. Leakage Testing. Leakage tests shall be specified including testing methods and leakage limits . Testing shall conform with Sections 401.3.6 and 505.3.3 of the “Idaho Standards for Public Works Construction, ” incorporated by reference into these rules at Section 004. (3-31-22) f. Thrust Blocking. Thrust blocking shall conform with Sections 401.3.4 of the “Idaho Standards fo r Public Works Construction,” incorporated by reference into these rules at Section 004. (3-31-22) g. Maintenance Considerations. Isolation valves shall be used if force mains connect into a commo n force main. (3-31-22) h. Cover. Force mains shall be covered with sufficient earth or other insulation to prevent freezing o r other physical damage. (3-31-22) 442. – 449. (RESERVED) 450. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER TREATMENT O R DISPOSAL FACILITIES: WASTEWATER TREATMENT FACILITIES: GENERAL. 01. Plant Location. (3-31-22) a. General. The preliminary engineering report or facility plan shall include a detailed discussion fo r new facilities regarding site selection criteria and alternatives considered. See Sections 410 and 411. (3-31-22) b. Flood protection. The treatment plant structures, electrical, and mechanical equipment shall be protected from physical damage by the one hundred (100) year flood. Treatment plants shall be designed to remai n fully operational and accessible during the one hundred (100) year flood. This requirement applies to new construction and to existing facilities undergoing major modification. Local, state and federal flood plain regulation s shall be considered. (3-31-22) c. Setback distances. Facilities open to the atmosphere such as lagoons, open clarifiers, open aeratio n basins, and other such facilities shall be placed a minimum of two hundred (200) feet from residential property lines . If such open facilities are adjacent to property zoned as commercial or industrial, a lesser setback will be considere d by the Department on a case by case basis. For totally enclosed facilities with noise and odor controls, the minimu m setback shall be fifty (50) feet if approved by the Department. Neighboring property owners may grant long ter m easements or other types of legal documents tied to the land to allow for similar setbacks from future development o r public use. (3-31-22) 02. Quality of Effluent. The required degree of wastewater treatment shall be based on the effluen t requirements and water quality standards established by the responsible state agency and appropriate federa l regulations including discharge permit requirements. Combined sewer overflows are not allowed. (3-31-22) 03. Design. (3-31-22) a. Type of Treatment. The preliminary engineering report or facility plan shall include a detaile d discussion regarding criteria and alternatives considered in selection of the appropriate type of treatment. Se e Sections 410 and 411. The plant design shall provide the necessary flexibility to perform satisfactorily within the expected range of waste characteristics and volumes. (3-31-22) b. Required Engineering Data for New Process and Application Evaluation. The policy of th e Department is to encourage rather than obstruct the development of any valid methods or equipment for treatment o f wastewater. The lack of inclusion in these standards of some types of wastewater treatment processes or equipmen t should not be construed as precluding their use. The Department may approve other types of wastewater treatmen t processes and equipment that meet the performance standards set forth in these rules under the condition that th e operational reliability and effectiveness of the process or device shall have been demonstrated under simila r conditions with a suitably-sized unit operating at its design load conditions, to the extent required. To determine tha t such new processes and equipment or applications have a reasonable and substantial chance of success, th e Department may require the following: (3-31-22) i. Monitoring observations, including test results and engineering evaluations, demonstrating the efficiency of such processes. (3-31-22) ii. Detailed description of the test methods. (3-31-22) iii. Testing, including appropriately-composited samples, under various ranges of strength and flo w rates (including diurnal variations) and waste temperatures over a sufficient length of time to demonstrat e performance under climatic and other conditions which may be encountered in the area of the proposed installations. (3-31-22) iv. Other appropriate information. The Department may require that appropriate testing be conducte d and evaluations be made under the supervision of a competent process engineer other than those employed by th e manufacturer or developer. (3-31-22) c. Design period. The design period shall be clearly identified in the preliminary engineering report o r facility plan as required in Sections 410 and 411. (3-31-22) d. Design Loads. (3-31-22) i. Hydraulic Design. (3-31-22) (1) Critical Flow Conditions. Flow conditions critical to the design of the treatment plant shall be a s described in the preliminary engineering report required by Section 411. Initial low flow conditions must b e evaluated in the design to minimize operational problems with freezing, septicity, flow measurements and solids dropout. The appropriate design flows must be considered in evaluating unit processes, pumping, piping, etc. (3-31-22) (2) Treatment Plant Design Capacity. The treatment plant design capacity shall be as described i n Section 411. The plant design flow selected shall meet the appropriate effluent and water quality standards that are se t forth in the discharge or other appropriate permit. For plants subject to high wet weather flows or overflow detentio n pump-back flows, the design maximum flows that the plant is to treat on a sustained basis shall be specified. (3-31-22) (3) Flow Equalization. Facilities for the equalization of flows and organic shock load shall b e considered at all plants which are critically affected by surge loadings. (3-31-22) ii. Organic Design. Organic loadings for wastewater treatment plant design shall be based on th e information provided in the preliminary engineering report required by Section 411. The effects of septage flo w which may be accepted at the plant shall be given consideration and appropriate facilities shall be included in th e design. See Section 520. (3-31-22) iii. Shock Effects. The shock effects of high concentrations and diurnal peaks for short periods of tim e on the treatment process, particularly for small treatment plants, shall be considered. (3-31-22) e. Conduits. All piping and channels shall be designed to carry the maximum expected flows . Conduits shall be designed to avoid creation of pockets and corners where solids can accumulate. (3-31-22) f. Gates or Valves. Suitable gates or valves shall be placed in channels to seal off unused section s which might accumulate solids. The use of shear gates, stop plates or stop planks is permitted where they can be use d in place of gate valves or sluice gates. Non-corrodible materials shall be used for control gates and conduits. (3-31-22) g. Arrangement of Units. Component parts of the plant shall be arranged for appropriate operating an d maintenance convenience, flexibility, economy, continuity of maximum effluent quality, and ease of installation o f future units. (3-31-22) h. Flow Division Control. Flow division control facilities shall be provided as necessary to ensur e organic and hydraulic loading control to plant process units and shall be designed for easy operator access, change, observation, and maintenance. Appropriate flow measurement facilities shall be incorporated in the flow divisio n control design. (3-31-22) i. Odor Management. An odor management plan shall be submitted to and approved by th e Department as a part of the preliminary engineering report described in Section 411. The Water Environmen t Federation Guidance referenced in Section 008 of these rules provides guidance for use in developing an odo r management plan that is inclusive of the facilities being designed. (3-31-22) j. Cold Weather. Facilities shall be designed with regard for proper operation and maintenance an d protection during cold weather temperatures expected at the specific location. The Water Environment Federatio n Guidance referenced in Section 008 of these rules provides guidance for use in designing, operating and maintainin g facilities in cold weather. (3-31-22) 04. Plant Details. (3-31-22) a. Unit Bypasses. (3-31-22) i. Removal from Service. Properly located and arranged bypass structures and piping shall b e provided so that each unit of the plant can be removed from service independently. The bypass design shall facilitat e plant operation during unit maintenance and emergency repair so as to minimize deterioration of effluent quality an d ensure rapid process recovery upon return to normal operational mode. The actuation of all bypasses shall requir e manual action by operating personnel. All power-actuated bypasses shall be designed to permit manual operation i n the event of power failure. (3-31-22) ii. Unit Bypass During Construction. Unit bypassing during construction shall be in accordance wit h the preliminary engineering report required by Section 411. (3-31-22) b. Unit dewatering, flotation protection, and plugging. Drains or sumps shall be provided t o completely dewater each unit to an appropriate point in the process. Due consideration shall be given to the possibl e need for hydrostatic pressure relief devices to prevent flotation of structures. Pipes subject to plugging shall b e provided with means for mechanical cleaning or flushing. (3-31-22) c. Construction materials. Materials shall be selected that are appropriate under conditions o f exposure to hydrogen sulfide and other corrosive gases, greases, oils, and other constituents frequently present i n wastewater. This is particularly important in the selection of metals and paints. (3-31-22) d. Painting. The contents and direction of flow shall be identified on the piping in a contrasting color. (3-31-22) e. Operating equipment. Tools, accessories, and spare parts necessary for the plant operator’s use shall be provided. (3-31-22) f. Storage and work space facilities. Readily accessible storage and work space facilities shall b e provided, and consideration shall be given to provision of a garage for large equipment storage, maintenance, and repair. (3-31-22) g. Erosion control during construction. Effective site erosion control shall be provided durin g construction. (3-31-22) h. Grading and landscaping. Upon completion of the plant, the ground shall be graded and landscaped in accordance with the preliminary engineering report developed in the preliminary engineering report required b y Section 411. (3-31-22) 05. Plant Outfalls. (3-31-22) a. Discharge impact control. The outfall shall be designed to discharge to the receiving stream in a manner acceptable to various reviewing authorities including, but not limited to, EPA, the Idaho Department of Environmental Quality, U.S. Army Corp of Engineers, Idaho Department of Water Resources, and local jurisdictions. (3-31-22) b. Protection and Maintenance. The outfall shall be so constructed and protected against the effects o f floodwater, ice, or other hazards as to reasonably ensure its structural stability and freedom from stoppage. Hazards to navigation shall be considered in designing outfalls. (3-31-22) c. Sampling Provisions. All outfalls shall be designed so that a sample of the effluent can be obtaine d at a point after the final treatment process and before discharge to or mixing with the receiving waters. (3-31-22) 06. Essential Facilities. (3-31-22) a. Emergency Power Facilities. (3-31-22) i. General. All wastewater treatment plants shall be provided with an alternate source of electri c power or pumping capability to allow continuity of operation during power failures. Refer to Subsection 440.07.c. fo r design requirements. Methods of providing alternate sources include: (3-31-22) (1) The connection of at least two (2) independent power sources such as substations. A power line from each substation is required if this method is used. The determination of the independent power sources shall be done by the appropriate power provider and stated in a letter from that provider. (3-31-22) (2) In-place internal combustion engine equipment which will generate electrical or mechanica l energy. (3-31-22) (3) Portable pumping equipment when only emergency pumping is required. Where part or all of the engine-driven pumping equipment is portable, adequate emergency storage capacity with alarm system shall b e provided to allow time for detection of pump station failure and transportation and hookup of the portable equipment. (3-31-22) ii. Power for Aeration. Standby generating capacity normally is not required for aeration equipment used in the activated sludge process. In cases where a history of chronic, long-term (four (4) hours or more) powe r outages have occurred, auxiliary power for minimum aeration of the activated sludge will be required as provided i n Subsections 450.06.a.i.(1) or 450.06.a.i.(2). (3-31-22) iii. Power for Disinfection. Standby generating capacity, as provided in Subsections 450.06.a.i.(1) o r 450.06.a.i.(2), is required for disinfection facilities and dechlorination facilities. (3-31-22) b. Water Supply. Section 009 provides a reference to the Uniform Plumbing Code, compliance wit h which may be required by other law. (3-31-22) c. Sanitary Facilities. Section 009 provides a reference to the Uniform Plumbing Code, complianc e with which may be required by other law. (3-31-22) d. Stairways. Stairways shall be installed in lieu of ladders for top access to units requiring routin e inspection and maintenance (such as digesters, trickling filters, aeration tanks, clarifiers, tertiary filters, etc.). (3-31-22) e. Flow Measurement. (3-31-22) i. Location. Flow measurement devices shall be provided to measure the following flows: (3-31-22) (1) Plant influent or effluent flow. (3-31-22) (2) If influent flow is significantly different from effluent flow, both shall be measured or otherwis e accounted for by other flow measurement facilities. (3-31-22) (3) Other flows required to be monitored under the provisions of the discharge permit. (3-31-22) (4) Other flows such as return activated sludge, waste activated sludge, and recycle required for plant operational control. (3-31-22) ii. Devices. Indicating, totalizing, and recording flow measurement devices for all influent or effluent flows shall be provided for all plants. Any other flow measurement device may be indicating and totalizing only. Al l flow measurement equipment must be sized to function to a satisfactory level of accuracy over the full range of flow s expected and shall be protected against freezing. (3-31-22) iii. Hydraulic Conditions. Flow measurement equipment including approach and discharge condui t configuration and critical control elevations shall be designed to ensure the required hydraulic conditions necessar y for the measurement accuracy needed for the specific application. (3-31-22) iv. Calibration and Certification. The flow measurement devices specified in Subsection s 450.06.e.i.(1) through 450.06.e.i.(3) shall be calibrated and certified at manufacturer-specified frequencies.(3-31-22) f. Sampling Equipment. Effluent composite sampling equipment shall be provided at all mechanica l plants and at other facilities where necessary to meet discharge permit monitoring requirements. Composite samplin g equipment shall also be provided as needed for influent sampling and for monitoring plant operations. The influen t sampling point shall be located prior to any process return flows. (3-31-22) 07. Safety. (3-31-22) a. General. Provisions shall be made to consider the protection of maintenance personnel and visitor s from typical and foreseeable hazards in accordance with the engineering standards of care. Enclosure of the plant site with a fence and signs designed to discourage the entrance of unauthorized persons and animals is required. (3-31-22) b. Hazardous Chemical Handling. The materials utilized for storage, piping, valves, pumping, metering, splash guards, etc., shall be specially selected considering the physical and chemical characteristics of eac h hazardous or corrosive chemical. (3-31-22) 08. Laboratory. (3-31-22) a. All treatment plants shall include a laboratory for making the necessary analytical determination s and operating control tests, except for those plants utilizing only processes not requiring laboratory testing for plan t control and where satisfactory off-site laboratory provisions are made to meet the permit monitoring requirements . The laboratory shall have sufficient size, bench space, equipment, and supplies to perform all self-monitorin g analytical work required by discharge permits, and to perform the process control tests necessary for goo d management of each treatment process included in the design. (3-31-22) b. Treatment plant laboratory needs may be divided into the following three (3) general categories: (3-31-22) i. Plants performing only basic operational testing; this typically includes pH, temperature, dissolve d oxygen, and chlorine residual. (3-31-22) ii. Plants performing more complex operational and permit laboratory tests including biochemica l oxygen demand, suspended solids, and fecal coliform analysis. (3-31-22) iii. Plants performing more complex operational, permit, industrial pretreatment, and multiple plan t laboratory testing. (3-31-22) c. Expected minimum laboratory needs for the three (3) plant classifications set out in Subsectio n 450.08.b. must be addressed in the preliminary engineering report. (3-31-22) 09. Instructions and Equipment. Wastewater treatment equipment shall be supplied with a complete set of operational instructions, including emergency procedures, maintenance schedules, tools and such spare parts a s may be necessary. (3-31-22) 10. Operation and Maintenance. An operation and maintenance manual shall be submitted to an d approved by the Department as required by Section 425. Adherence to the terms of this approved manual shall be required. The owner shall be responsible for maintaining the wastewater facility in a manner that assures its designe d operation. (3-31-22) 451. -- 454. (RESERVED)