Demonstration Of Technical, Financial, And Managerial Capacity

No person may proceed, or cause to proceed, with construction of a new community wastewater system, a new private treatment plant, a new municipal wastewater treatment facility, or a new privately owned municipal wastewater pumping station until it has been demonstrated to the Department that the wastewater system will have adequate technical, financial, and managerial capacity. Demonstration of capacity must be submitted to the Department prior to, or concurrent with, the submittal of plans and specifications, as described in Section 39-118, Idaho Code, and Subsection 400.03. The Department will issue in writing its approval of the new system capacity demonstration. Existing wastewater systems incapable of demonstrating technical, financial, or managerial capacity as identified through operational problems, may be required to submit additional technical, financial, or managerial documentation to the Department for review and approval. (7-1-26) 01. Technical Capacity. To meet this provision, the system owner must submit documentation demonstrating: (7-1-26) 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 operational characteristics of the system. (3-31-22) 02. Financial Capacity. (7-1-26) a. Documentation of financial capacity must include, but is not limited to: (7-1-26) i. Organizational and financial arrangements adequate to construct and operate the wastewater system in accordance with these rules. This information can be provided by submitting estimated construction, operation, and maintenance costs, letters of credit, or other access to financial capital through public or private sources and, if available, a certified financial statement; (7-1-26) ii. Revenue sufficiency, that includes, but is not limited to, billing and collection procedures; a proposed rate structure demonstrating the availability of operating funds; revenues for depreciation and reserves; and the ability to accrue a capital replacement fund. A preliminary operating budget must be provided; and (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 410 Page 17 iii. Adequate fiscal controls. (7-1-26) b. For private 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 operation and maintenance. (7-1-26) 03. Managerial Capacity. To demonstrate adequate managerial capacity, the system owner must submit at least the following information to the Department: (7-1-26) a. Clear documentation of legal ownership and any plans that may exist for transfer of that ownership 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 to ensure that the wastewater system follows these rules; (7-1-26) c. The name, address, and telephone number of the responsible charge operator and the substitute responsible charge operator; (7-1-26) d. A description of how the wastewater system will be managed. Information such as by-laws, restrictive covenants, articles of incorporation, or procedures and policy manuals which describe the management organizational structure must be provided; (7-1-26) e. A description of staff qualifications, including training, experience, certification or licensing, and continuing education; (7-1-26) f. An explanation of how the wastewater system will establish and maintain effective 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 longterm replacement of system components. (7-1-26) 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 wastewater system. If such 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 protection of public health. (7-1-26) 410. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: FACILITY PLANS. 01. Facility Plans. Unless otherwise noted in this subsection, all new municipal wastewater systems and all existing municipal wastewater systems undergoing material modification are required to have a current facility plan that addresses all applicable issues specifically required in Sections 410 and 420 through 599. The facility plan must address these issues sufficiently to determine the effects of the project on the overall wastewater infrastructure. Facility plans must address the entire potential service area of the wastewater system. A facility plan may be completed for collection systems only, for treatment facilities only, or for both the collection system and the treatment facility. If such a collection system facility plan is prepared, and flows increase more than the design capacity of downstream collection and treatment facilities, the impact of the flow must be addressed in the facility plan. (7-1-26) a. A facility plan is not required if the Department is provided documentation supporting the ability of the wastewater system to provide service for the simple wastewater main extension without adding wastewater pumping stations or treatment capacity to the treatment facility and without overloading the existing collection system. Documentation may be in the form of: (7-1-26) i. Hydraulic modeling; (3-31-22) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 410 Page 18 ii. Usage data and flow calculations; (3-31-22) iii. Declining balance reports that demonstrate the wastewater system has the capacity to supply the service area of the system served by the extension; or (7-1-26) iv. Other documentation acceptable to the Department. (3-31-22) b. A Department-approved facility plan is not required to be in place prior to the QLPE approving simple wastewater main extensions pursuant to Subsection 400.03.b., provided that the system is in compliance with the facility and design standards in the area served by the extension. If the Department has not approved a facility plan which covers the proposed simple wastewater main extension, then the system owner or the QLPE must include with the transmittal letter documentation supporting the ability of the system owner to provide service for the simple wastewater main extension without adding wastewater pumping stations or treatment capacity to the system and without overloading the existing collection system. The system owner must provide this documentation to the QLPE as necessary. Documentation may be in the form of: (7-1-26) 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 must be submitted to the Department for review and approval prior to the submission of plans and specifications for a project related to the facility plan. (7-1-26) 03. Engineer’s Seal. Facility plans submitted to the Department must be sealed, signed, and dated by the professional engineer in responsible charge of their preparation. (7-1-26) 04. Facility Plan Contents. The facility plan must assemble basic information, present criteria and assumptions, address hydraulic capacity, treatment capacity, and operation and maintenance considerations, and examine alternative solutions with preliminary layouts, cost estimates, and project financing. The facility plan is intended to address system wide growth, to identify system deficiencies, and to lay out a plan for system upgrades and expansion. The minimum requirements for a facility plan are in Subsections 410.04.a. through 410.04.c. If specific items are not applicable to a particular facility plan, then the engineer must state this in the facility plan and state the reason why it is not applicable. (7-1-26) a. The facility plan for a new wastewater system must include sufficient detail to support the provisions of Sections 410 through 520 and address these items: (7-1-26) i. Provide a general description and location of the system including service boundaries; (7-1-26) ii. Provide the estimated design population and service connections expressed as EDUs of the system; (7-1-26) iii. Provide design data for domestic, commercial, and industrial wastewater generation, including average day, maximum day, maximum month, or peak hour flows; (7-1-26) iv. Identify and describe any anticipated or proposed wastewater collection systems. Include specific details on any anticipated or proposed wastewater pumping stations and on any anticipated or proposed wastewater interceptor or trunk lines; (7-1-26) v. Identify and describe any anticipated or proposed treatment facilities. Provide specific detail on the type and level of treatment and the required capacity of the treatment facility; (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 411 Page 19 vi. Identify and describe any anticipated or proposed wastewater disposal system(s). Include specific information on the location and method of disposal and information on any existing disposal permits or estimated timelines to obtain anticipated required permits; and (7-1-26) vii. 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. (7-1-26) b. The facility plan for an existing wastewater system must include sufficient detail to support the provisions of Sections 410 through 520, address all items in Subsections 410.04.a.i. through 410.04.a.viii., and the following: (7-1-26) i. Provide a system-wide hydraulic analysis of the collection system unless otherwise approved by the Department. Any hydraulic analysis of an existing collection system must be properly calibrated. The type and sophistication of the hydraulic analysis will be dependent on the type of the wastewater system; (7-1-26) ii. Identify and evaluate problems or deficiencies related to the wastewater system; (7-1-26) iii. Identify the design capacity of existing facilities and the current operating flows; (7-1-26) iv. Identify if two (2) or more wastewater systems will become one operating under the same governance, management, and financial functions including the physical interconnection of two or more wastewater systems; (7-1-26) v. Describe financing options for projects identified in the facility plan; (7-1-26) vi. Set forth anticipated charges for users; (7-1-26) vii. Review organizational and staffing requirements; (7-1-26) viii. Offer project recommendations for client consideration; and (7-1-26) ix. Outline official actions and procedures to implement the project. (3-31-22) c. If the project is funded by the state revolving fund or a state grant, the facility plan must meet the provisions of Subsections 410.04.a. and 410.04.b., and other requirements that may also apply. See IDAPA 58.01.12, “Rules for Administration of Wastewater and Drinking Water Loan Funds,” and IDAPA 58.01.22, “Rules for Administration of Planning Grants for Drinking Water and Wastewater Facilities.” (7-1-26) d. A checklist which can be used for guidance can be found on the DEQ 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. (7-1-26) 411. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: PRELIMINARY ENGINEERING REPORTS. 01. Preliminary Engineering Reports (PERs). PERs are required for municipal wastewater system projects that require plan and specification review and approval pursuant to Subsection 400.03 and must address all applicable issues specifically required in Sections 411 through 599. PERs must be completed for wastewater collection system projects, all pump station projects, all treatment facility designs and upgrades, and all septage transfer stations. PERs are not required for simple wastewater main extensions that are approved in accordance with Subsections 410.01.a. or 410.01.b. (7-1-26) 02. Submittal to Reviewing Authority. PERs must be submitted to the Department for review and approval prior to the submission of plans and specifications. (7-1-26) 03. PER Contents. The PER must include sufficient detail to demonstrate that the proposed project IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 411 Page 20 meets applicable design criteria. The PER generally addresses project specific issues rather than the overall system- wide plan. The PER must identify and evaluate wastewater related problems; assemble basic information; present design criteria and 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 in Subsections 411.03.a. through 411.03.c., and other items specifically described in Sections 426 through 599 must be addressed in detail in the PER. If specific items are not applicable to a particular design, then the designer must state this in the PER 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 by reference for purposes of the PER. (7-1-26) a. Items applicable to all PERs: (7-1-26) i. The PER must reference or update items provided in the Department-approved facility plan. These items include, but are not limited to: (7-1-26) (1) Location of project; (3-31-22) (2) Existing and future population and service connections expressed as EDUs served by project; (7-1-26) (3) Existing and future wastewater flow rates; (7-1-26) (4) Existing and proposed collection system; (3-31-22) (5) Existing and proposed treatment facilities; (7-1-26) (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. The PER must include a summary of applicable codes and standards that apply to the proposed project; (7-1-26) iii. The PER must provide as applicable estimated construction costs for public works projects or projects funded by public monies; and (7-1-26) iv. The PER must include the proposed construction schedule. (7-1-26) b. Items applicable to PERs for wastewater collection system projects include all items listed in Subsection 411.03.a. and: (7-1-26) i. Current project and future wastewater flow rates including build out conditions; (7-1-26) ii. Piping size, material, and installation methods; (7-1-26) iii. Depth of bury and slope including justification for slopes based on widely used guidance documents or published friction coefficients and Manning’s formula; (7-1-26) iv. Soil and groundwater conditions; (7-1-26) v. Corrosion protection; and (7-1-26) vi. Odor control. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 411 Page 21 c. Items applicable to PERs for wastewater pump station projects include all items listed in Subsection 411.03.a. and the following: (7-1-26) i. The PER must discuss and present the design criteria applicable to the proposed project. The design criteria includes, but is not limited to: (7-1-26) (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; (7-1-26) (a) Friction losses through force mains must be based on the Hazen and Williams formula or other acceptable methods. When the Hazen and Williams formula is used, the friction losses for varying values of “C” must be evaluated for different types and ages of pipe; and (7-1-26) (b) When initially installed, force mains will have a significantly higher “C” factor. The effect of the higher “C” factor must 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 must also be considered; and (7-1-26) (4) Redundancy provisions. (3-31-22) ii. The PER must describe the proposed site and layout of the wastewater pumping station. This information includes, but is not limited to: (7-1-26) (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. The PER must discuss instrumentation and control that will be provided. This information includes, but is not limited to: (7-1-26) (1) System configuration; (3-31-22) (2) Operator interface; (3-31-22) (3) Process and instrumentation diagrams; (7-1-26) (4) Alarm systems. (3-31-22) iv. The PER must describe how the system will be operated during power outages, equipment failures, or other unforeseen system failures. (7-1-26) d. Items applicable to PERs for wastewater treatment facility designs and upgrades include all items listed in Subsection 411.03.a., Subsection 411.03.c., and the following: (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 411 Page 22 i. The PER must discuss and present the design criteria applicable to the proposed project. The design criteria includes, but is not limited to: (7-1-26) (1) Wastewater flow rates including average day, maximum day, maximum month, and peak hour 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. The PER must describe the proposed site and layout of the treatment facilities. This information includes, but is not limited to: (7-1-26) (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) Sludge process facilities and conveyance; (7-1-26) (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 and proposed unit bypassing requirements in accordance with applicable disposal permits. (7-1-26) iii. The PER must provide a hydraulic profile for the proposed treatment facilities. This information includes, but is not limited to: (7-1-26) (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) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 425 Page 23 iv. The PER must describe in detail the proposed process units and discuss how the proposed units will interface with any existing process units. This information includes, but is not limited to: (7-1-26) (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 for handling initial system flows that are less than minimum flow requirements for the process unit(s). (7-1-26) 04. Engineer’s Seal. PERs submitted to the Department must be sealed, signed, and dated by the professional engineer in responsible charge of their preparation. (7-1-26) 412. -- 424. (RESERVED) 425. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: OPERATION AND MAINTENANCE MANUALS. 01. Manual Contents. An operation and maintenance manual or manuals must be developed for all wastewater systems and include, but not limited to, the following contents: daily operating instructions, operator safety and emergency response procedures, location of valves and other key system features, a parts list and parts order forms, maintenance schedule, and information for contacting the responsible charge operators. An operational trouble-shooting section must be supplied to the wastewater system as part of any proprietary unit installed in system’s facilities. (7-1-26) 02. Approval. Final operation and maintenance manuals for new construction or material modification of wastewater systems that include pumping stations or treatment facilities must be submitted to the Department for review and approval prior to start-up of the proposed system unless the system components are already covered in an existing manual. (7-1-26) 426. -- 429. (RESERVED) 430. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS -- DESIGN AND CONSTRUCTION OF WASTEWATER PIPELINES. 01. Design Capacity. Sewer capacities must be designed for the estimated buildout flow, except in considering parts of the systems that can be readily increased in capacity. (7-1-26) 02. Details of Design and Construction. (3-31-22) a. Minimum pipe size for gravity sewer mains must be eight (8) inches in diameter. Minimum pipe size for gravity sewer services must be four (4) inches in diameter. Pipe diameters larger than these minimums must be based on cleaning capability and hydraulic capacity and conform with the required planning documents. (7-1-26) b. Wastewater pipelines must be installed sufficiently deep or specifically designed to prevent freezing and to protect the facilities from surface loading. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 430 Page 24 c. Buoyancy of wastewater pipelines must be considered and flotation of the pipe must be prevented with appropriate construction where high groundwater conditions are anticipated. (7-1-26) d. Gravity wastewater pipelines must be designed to have sufficient slope and velocity to “selfclean” or transport constituent solids to the treatment facility. (7-1-26) 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 selfcleaning, the owner must, as a condition of the 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. This would include the use of cutting tools for roots, Vactor trucks, and any other method required to keep the pipelines clean, intact and flowing. That commitment must be in the form of a letter from both the owner and the future owner entity stating said commitment and must include a discussion of the current and future owners’ capacity to complete annual servicing. (7-1-26) ii. If the owner is a developer that is passing the operation and maintenance on to a homeowner’s association or other similar entity, the design may not allow for velocities that are less than selfcleaning. (7-1-26) e. Materials. (3-31-22) i. The material selected should be adapted to local conditions, such as: character of industrial wastes, possibility of septicity, soil characteristics, exceptionally heavy external loadings, abrasion, corrosion, and similar problems. (7-1-26) ii. Couplings complying with applicable standard specifications must be used for joining dissimilar materials. (7-1-26) iii. For new pipe materials for which standards have not been established, the design engineer must provide complete pipe specifications and installation specifications developed on the basis of criteria adequately documented and certified in writing by the pipe manufacturer to be satisfactory for the specific application. (7-1-26) f. Installation specifications must contain appropriate requirements based on the criteria, standards, and requirements established by industry in its technical publications. For assistance in designing such specifications, see “Idaho Standards for Public Works Construction,” referenced in Section 008. (7-1-26) g. Joints and Infiltration. (3-31-22) i. The installation of joints and the materials used must be included in the specifications. Wastewater pipeline joints must be designed to minimize infiltration and to prevent the entrance of roots throughout the life of the system. For assistance in designing such specifications, see “Idaho Standards for Public Works Construction,” referenced in Section 008. (7-1-26) ii. Service connections to the wastewater pipeline main must be watertight and not protrude into the wastewater pipelines. If a saddle type connection is used, it must be a device designed to join with the types of pipe which are to be connected. All materials used to make service connections must be compatible with each other and with the pipe materials to be joined and must be corrosion proof. (7-1-26) h. Manholes must be installed at the end of each line; at all changes in grade, size, or alignment; at all intersections. Cleanouts may not be used unless otherwise approved by the Department and may not be substituted for manholes nor installed at the end of laterals greater than one hundred fifty (150) feet in length. (7-1-26) i. Testing must conform with Section 501.3.4 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004. (7-1-26) j. Inverted siphons may not have less than two (2) barrels or pipes and will be provided with necessary appurtenances for maintenance, convenient flushing, and cleaning equipment. Design must provide IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 430 Page 25 sufficient head and appropriate pipe sizes to secure sufficient velocities for design flow. (7-1-26) k. The top of all wastewater pipelines entering or crossing surface water bodies must be at a sufficient depth below the natural bottom of the bed or otherwise designed to protect the wastewater pipeline. (7-1-26) i. Wastewater pipelines located adjacent to surface water bodies must be located outside of the bed and sufficiently removed therefrom to provide for future possible stream widening and to prevent pollution by siltation during construction. (7-1-26) ii. Wastewater pipeline outfalls, headwalls, manholes, gate boxes, or other structures must be designed to address anticipated flood flows of the surface water bodies. (7-1-26) iii. 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 must be free from change in grade. (7-1-26) iv. Wastewater pipelines entering or crossing surface water bodies must be constructed of water transmission pressure rated pipe with restrained joints conforming to Section 401.2.9 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004, or other suitable pipe with restrained joints capable of being installed to remain watertight and free from changes in alignment or grade. Material used to back-fill the trench must be concrete slurry, stone, coarse aggregate, washed gravel, or other materials which will not readily erode, cause siltation, damage pipe during placement, or corrode the pipe. (7-1-26) v. Construction methods that will minimize siltation and erosion must be employed. (7-1-26) l. Support must be provided for all joints in pipes utilized for aerial crossings. Restrained joints or structural casings are required. (7-1-26) m. There may be no physical connections between a public or private potable water supply system and a wastewater pipeline, or appurtenance thereto, which would permit the passage of any wastewater or polluted water into the potable supply. No water pipe may pass through or contact any part of a wastewater pipeline manhole. (7-1-26) n. When wastewater pipelines are proposed in the vicinity of any existing public or private drinking water sources or supplies or other drinking water facilities, excluding potable pipelines, the following separation distances must be maintained. (7-1-26) i. Pressure wastewater mains will not be closer horizontally than one hundred (100) feet. (7-1-26) ii. Gravity wastewater mains will not be closer horizontally than fifty (50) feet. (7-1-26) iii. Wastewater service lines will not be closer horizontally than fifty (50) feet from any public water system source. (7-1-26) iv. Wastewater service lines will not be closer horizontally than twenty-five (25) feet from private drinking water sources and other drinking water facilities. (7-1-26) o. The requirements for the protection of potable pipelines from contamination by non-potable pipelines are described in Subsections 430.02.o.ii. and 430.02.o.iii. For this subsection, the term “pipeline” applies to both mains and services. Raw water pipelines must meet equivalent separation distances of Subsections 430.02.o.ii. through 430.02.o.iv. from either potable or non-potable pipelines. (7-1-26) i. Alternative separation distances may be considered for Subsections 430.02.o.ii. through 430.02.o.iii. on a case-by-case basis when considering constructability, public health risk, environmental risk, and cost. The design engineer must submit data to the Department for review and approval showing that the proposed installation will be protective of public health and the environment. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 430 Page 26 ii. 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. (7-1-26) (b) Ten (10) feet to six (6) feet separation: separate trenches, with the bottom of the potable main above the top of the non-potable main, and non-potable main constructed with potable water class pipe. (7-1-26) (c) Non-potable mains are prohibited from being located in the same trench as potable mains. (3-31-22) (2) Non-potable services in relation to potable pipelines and potable services in relation to non-potable pipelines. (7-1-26) (a) Greater than six (6) feet separation: no additional requirements. (7-1-26) (b) Non-potable services are prohibited from being located in the same trench as potable pipelines. (7-1-26) iii. Requirements for potable water pipelines crossing non-potable pipelines. Crossings must be perpendicular, unless otherwise approved by the Department. (7-1-26) (1) If there are eighteen (18) inches or more vertical separation with the potable water pipeline above the non-potable pipeline, then the potable pipeline joints must be as far as possible from the non-potable water pipeline. (7-1-26) (2) If there are eighteen (18) inches or more vertical separation with the potable water pipeline below the non-potable pipeline, then the potable pipeline joints must be as far as possible from the non-potable pipeline, and the non-potable pipeline must be supported through the crossing to prevent settling. (7-1-26) (3) Less than eighteen (18) inches vertical separation: (3-31-22) (a) Potable pipeline joints must be as far as possible from the non-potable pipeline; and either: (7-1-26) (b) Non-potable pipeline must be constructed with potable water class pipe for a minimum of ten (10) feet either side of potable pipeline with a single twenty (20) foot section of potable water class pipe centered on the crossing; or (7-1-26) (c) Either the non-potable or potable pipeline must be sleeved with potable water class pipe for ten (10) feet either side of crossing. Use of hydraulic cementitious materials such as concrete, controlled density fill, and concrete slurry encasement is not allowed as a substitute for sleeving. (7-1-26) (d) If the potable pipeline is below non-potable pipeline, the non-potable pipeline must also be supported through the crossing to prevent settling. (3-31-22) iv. Non-potable pressure pipelines must not be: (7-1-26) (1) Closer horizontally than ten (10) feet from potable pipelines; and (7-1-26) (2) Closer vertically than eighteen (18) inches from potable pipelines. (7-1-26) v. New non-potable wastewater mains or non-potable wastewater mains undergoing material modification must be separated by at least five (5) feet from buildings, industrial facilities, and other permanent structures. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 440 Page 27 431. -- 439. (RESERVED) 440. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: WASTEWATER PUMPING STATIONS. 01. General. Section 440 regulates municipal wastewater collection pump stations and not individual residence pump stations, individual residence grinder pump stations, or individual residence septic tank effluent pump stations. See Section 441 for regulation of those types of pump stations. (7-1-26) a. Wastewater pumping station structures and electrical and mechanical equipment must be protected from physical damage by the one hundred (100) year flood. Wastewater pumping stations must remain fully operational and accessible during the twenty-five (25) year flood. Regulations of state and federal agencies regarding flood plain obstructions shall be considered. (7-1-26) b. The pumping station must be accessible by maintenance vehicles during all weather conditions. (7-1-26) c. The wet well and pump station piping must be designed to avoid operational problems from the accumulation of grit. (7-1-26) d. Provisions must be made to consider the protection of maintenance personnel and visitors from typical and foreseeable hazards in accordance with the engineering standards of care. See also Subsection 450.07. (7-1-26) 02. Design. Design of wastewater pumping stations must meet the applicable provisions of Subsections 440.02.a. through 440.02.i. (7-1-26) a. Construction materials used for pumping station structures must be appropriate under conditions of exposure to hydrogen sulfide and other corrosive gases, greases, oils, and other constituents frequently present in wastewater. (7-1-26) i. Dry wells must be completely separated from the wet well. Common walls must be gas tight. (7-1-26) ii. Provisions must be made to facilitate removing pumps, motors, and other mechanical and electrical equipment. Individual pump and motor removal must not interfere with the continued operation of remaining pumps Suitable means of access for maintenance personnel wearing self-contained breathing apparatus must be provided to dry wells and to wet wells. See also Subsection 450.07. (7-1-26) iii. Where high groundwater conditions are anticipated, buoyancy of the wastewater pumping station structures must be considered and, if necessary, adequate provisions made for protection. (7-1-26) iv. Dry wells must be equipped with a positive means for dewatering. (7-1-26) b. Multiple pumps must be provided. Pumps must have capacity such that, with any pump out of service, the remaining pumps will have capacity to handle the design peak hour flow. (7-1-26) i. Pumps (except screw pumps) handling separate sanitary wastewater from thirty (30) inch or larger diameter sewers must be protected by bar racks. Appropriate protection from clogging must also be considered for small pumping stations. (7-1-26) ii. Pumps handling unscreened raw wastewater must be capable of passing spheres of at least three (3) inches in diameter. Pump suction and discharge openings must be at least four (4) inches in diameter. An exception to the requirement for passing solid spheres of at least three (3) inches in diameter may be made on a case-by-case basis when approved by the Department based on equivalent protection from clogging or damage, such as grinder pumps. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 440 Page 28 iii. The pump must be placed so that, under normal operating conditions, it will operate under a positive suction head, except as specified in Subsection 440.03. (7-1-26) iv. Electrical equipment must comply with local and state codes. (7-1-26) v. Design of intakes may use American National Standard Institute/Hydraulic Institute ANSI/HI 9.8, American National Standard for Centrifugal and Vertical Pump Intake Design. (7-1-26) vi. The pumps and controls must be designed to operate with varying wastewater flows into the wet well. The pump control system design must account for, and minimize, downstream impact of pump discharge hydraulic surges. The station design capacity must be based on peak hourly flow as determined in accordance with Section 411 and must be adequate to maintain a velocity in the force main sufficient to avoid solids deposition. (7-1-26) c. Water level control sensing devices must be designed to allow for automatic control of pumps. (7-1-26) d. Suitable shutoff and check valves must be placed on the discharge line of each pump (except on screw pumps). The check valve must be located between the shutoff valve and the pump. Check valves must be suitable for the material being handled and placed on the horizontal portion of the discharge piping except for ball checks, which may be placed in the vertical run. Valves must be capable of withstanding normal pressure and water hammer. All shutoff and check valves must be operable from the floor level and accessible for maintenance. Outside levers are recommended on swing check valves. (7-1-26) e. Suitable shutoff valves must be placed on the suction lines of dry pit pumps. (7-1-26) f. Wet Wells. (3-31-22) i. The American National Standard Institute/Hydraulic Institute ANSI/HI 9.8, American National Standard for Centrifugal and Vertical Pump Intake Design may be used as a guidance for design of wet wells. (7-1-26) ii. Covered wet wells must have provisions for air displacement to the atmosphere, such as an inverted “j” tube or other means. (7-1-26) g. Adequate ventilation must be provided for all pump stations unless access is provided using confined space entry procedures. Where the dry well is below the ground surface, mechanical ventilation must be provided. If screens or mechanical equipment requiring maintenance or inspection are in the wet well, permanently installed ventilation must be provided. There may be no interconnection between the wet well and dry well ventilation systems. (7-1-26) h. Suitable methods for measuring wastewater flow must be provided at all pumping stations. (7-1-26) i. There may 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 must comply with IDAPA 58.01.08, “Idaho Rules for Public Drinking Water Systems.” (7-1-26) 03. Suction Lift Pump Stations - Special Considerations. Suction lift pumps must meet the applicable provisions of Subsection 440.02. (7-1-26) a. Suction lift pumps must be of the self-priming or vacuum-priming type. Suction lift pump stations using dynamic suction lifts exceeding the limits outlined in Subsections 440.03.b. through 440.03.d. may be approved by the Department upon submission of factory certification of pump performance and detailed calculations indicating satisfactory performance under the proposed operating conditions. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 440 Page 29 b. Self-priming pumps must be capable of rapid priming and re-priming at the “lead pump on” elevation. Self-priming and re-priming must be accomplished automatically under design operating conditions. (7-1-26) c. Vacuum-priming pump stations must be equipped with dual vacuum pumps capable of automatically and completely removing air from the suction lift pump. The vacuum pumps must be 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 must not exceed twenty-two (22) feet. (7-1-26) d. The pump equipment compartment must be above grade or offset and be effectively isolated from the wet well to prevent a hazardous and corrosive sewer atmosphere from entering the equipment compartment. Wet well access may not be through the equipment compartment and must be at least twenty-four (24) inches in diameter. Gasketed replacement plates must be provided to cover the opening to the wet well for pump units removed for servicing. Valving may not be in the wet well. (7-1-26) 04. Submersible Pump Stations - Special Considerations. Submersible pump stations must meet the applicable provisions of Subsection 440.02, except as modified in Subsection 440.04. (7-1-26) a. Submersible pumps and motors must be designed specifically for raw wastewater use, including totally submerged operation during a portion of each pumping cycle. An effective method to detect shaft seal failure or potential seal failure must be provided. (7-1-26) b. Submersible pumps must be readily removable and replaceable without personnel entering or dewatering the wet well, or disconnecting any piping in the wet well. (7-1-26) c. Electrical equipment must comply with local and state codes. (7-1-26) i. Electrical supply, control, and alarm circuits must be designed to provide strain relief and to allow disconnection from outside the wet well. Terminals and connectors must be protected from corrosion by location outside the wet well or through use of watertight seals. (7-1-26) ii. The motor control center must be located outside the wet well, 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 must be located so that the motor may be removed and electrically disconnected without disturbing the seal. (7-1-26) iii. Pump motor power cords must be designed for flexibility and serviceability under conditions of extra hard usage. Ground fault interruption protection must be used to de-energize the circuit in the event of any failure in the electrical integrity of the cable. Power cord terminal fittings must be corrosion-resistant and constructed to prevent the entry of moisture into the cable, provided with strain relief appurtenances, and designed to facilitate field connecting. (7-1-26) d. Valves required under Subsection 440.02 must be in a separate valve chamber. Provisions must be made to remove or drain accumulated water from the valve chamber. The valve chamber may be dewatered to the wet well through a drain line with a gas and water tight valve. Check valves that are integral to the pump need not be in a separate valve chamber provided that the valve can be removed from the wet well in accordance with Subsection 440.04. Access must be provided in accordance with Subsection 440.02. (7-1-26) 05. Screw Pump Stations - Special Considerations. Screw pump stations must meet the applicable provisions of Subsection 440.02. (7-1-26) a. Covers or other means of excluding direct sunlight must be provided as necessary to eliminate adverse effects from temperature changes. (7-1-26) b. A positive means of isolating individual screw pump wells must be provided. (7-1-26) c. Submerged bearings must be lubricated by an automated system without pump well dewatering. IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 440 Page 30 (7-1-26) 06. Alarm Systems. Alarm systems with a backup power source must be provided for pumping stations. The alarm must be activated in cases of power failure, dry well sump and wet well high water levels, pump failure, pump clogging, unauthorized entry, or other cause of pump station malfunction. Pumping station alarms, including identification of the alarm condition, must be transmitted to a twenty-four (24) hour response center. Audio-visual alarm systems may be approved by the Department based upon location, station holding capacity, and inspection frequency. (7-1-26) 07. Emergency Operation. (3-31-22) a. Emergency operation for pump stations is required to prevent the unintended discharge of raw or partially treated wastewater to any waters or land surface and to protect public health by preventing back up of wastewater and subsequent discharge to basements, streets, and other public and private property. (7-1-26) b. Emergency pumping capability is required for all new pumping stations constructed after April 15, 2007. Emergency pumping capability is required for all existing pumping stations that undergo a material modification unless overall system reliability can be proven adequate to the Department as shown in Subsections 440.07.b.i. and 440.07.b.ii. (7-1-26) i. System reliability is adequate for an existing pumping station undergoing material modification if power grid outages average three (3) or less per year based on data for the three (3) previous years with no more than six (6) outages in a single year. (7-1-26) ii. Outage duration averages less than four (4) hours based on data for the three (3) previous years, with no 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. (7-1-26) c. Emergency pumping capability must be accomplished by either connection of the station to at least two (2) independent utility substations as determined by and stated in a letter from the appropriate power provider, by provision of portable or in-place internal combustion engine equipment which will generate electrical or mechanical energy, or by the provision of portable pumping equipment. Such emergency standby systems must 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 with rapid connection capabilities and appropriate valving must be provided outside the dry well and wet well. (7-1-26) i. The following general requirements apply to all internal combustion engines used to drive auxiliary pumps, service pumps through special drives, or electrical power generating equipment. (7-1-26) (1) The engine must be protected from operating conditions that would result in damage to equipment. Unless continuous manual supervision is planned, protective equipment must be capable of shutting down the engine and activating an alarm on site and as provided in Subsection 440.06. Protective equipment must monitor for conditions of low oil pressure and overheating, except that oil pressure monitoring is not required for engines with splash lubrication. (7-1-26) (2) The engine must have adequate rated power to start and continuously operate under all connected loads. (7-1-26) (3) Reliability and ease of starting, especially during cold weather conditions, must be addressed in the selection of the type of fuel. (7-1-26) (4) Fuel storage and piping facilities if provided must be constructed in accordance with applicable state and federal regulations. (7-1-26) (5) The engine must have adequate ventilation of fuel vapors and exhaust gases. (7-1-26) (6) All emergency equipment must be provided with instructions indicating the need for regular IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 440 Page 31 starting and running of such units at full loads. (7-1-26) (7) Emergency equipment must be protected from damage at the restoration of regular electrical power. (7-1-26) ii. Where permanently-installed or portable engine-driven pumps are used, the following requirements in addition to the provisions of Subsection 440.07.c.i. apply. (7-1-26) (1) Engine-driven pumps must meet the design pumping requirements unless storage capacity is available for flows in excess of pump capacity. Pumps must be designed for anticipated operating conditions, including suction lift if applicable. (7-1-26) (2) The engine and pump must be equipped to provide automatic start-up and operation of pumping equipment unless manual start-up and operation is justified. Provisions must also be made for manual start-up. Where manual start-up and operation is justified, storage capacity and alarm system must meet the provisions of Subsection 440.07.c.ii.(3). (7-1-26) (3) Where part or all engine-driven pumping equipment is portable, adequate emergency storage capacity as defined in Section 010 with alarm system must be provided to allow time for detection of pump station failure and transportation and hookup of the portable equipment. (7-1-26) iii. Where permanently-installed or portable engine-driven power generating equipment is used, the following requirements apply in addition to the provisions of Subsection 440.07.c.i. (7-1-26) (1) Power generating unit size must be adequate to provide power for pump motor starting current and for lighting, ventilation, and other auxiliary equipment necessary for safety and proper operation of the pumping station. (7-1-26) (2) The operation of only one pump during periods of auxiliary power supply must be justified based on the design peak hourly flows relative to single-pump capacity, anticipated length of power outage, and storage capacity. (7-1-26) (3) Manual or special sequencing controls must be provided to start pump motors unless the power generating equipment has capacity to start all pumps simultaneously with auxiliary equipment operating. (7-1-26) (4) Provisions must be made for automatic and manual startup and load transfer unless only manual start-up and operation is justified. Automatic transfer switches must be UL listed and meet NEC requirements. The generator must be protected from operating conditions that would result in damage to equipment. Provisions must be made to allow the engine to start and stabilize at operating speed before assuming the load. Where manual start-up and transfer is justified, the storage capacity and alarm system must meet the provisions of Subsection 440.07.c.iii.(5). (7-1-26) (5) Where portable power generating equipment and manual transfer is provided, adequate emergency storage capacity as defined in Section 010 with alarm system must be provided to allow time for detection of pump station failure and transportation and connection of power generating equipment. Special electrical connections and double throw switches must be provided for connecting portable power generating equipment. Manual transfer switches must be UL listed and meet NEC requirements. (7-1-26) iv. Where independent power substations are used for emergency power, each separate substation and its associated transmission lines must be capable of starting and operating the pump station at its rated capacity. (7-1-26) 08. Operation and Maintenance. (3-31-22) a. An operation and maintenance manual must be submitted to and approved by the Department as required by Section 425. Adherence to the terms of this approved manual is required. The owner is responsible for maintaining the pump station in a manner that ensures its designed operation. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 441 Page 32 b. For new privately owned 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 the long term must be submitted to the Department in accordance with Section 409. (7-1-26) 09. Force Mains. (3-31-22) a. A cleansing velocity of at least two (2) feet per second must be maintained within force mains at the design pumping rates. (7-1-26) b. An air relief valve must be placed at high points in the force main to prevent air locking unless otherwise approved by the Department. The force main configuration and head conditions must be evaluated to determine the need for and placement of vacuum relief valves. (7-1-26) c. The force mains from other than individual grinder pump stations must enter a receiving manhole. Corrosion protection for the receiving manhole must be provided. Control of odors at such discharge points must be evaluated. (7-1-26) d. Pipe and joints must be equal to water main strength materials suitable for design conditions. The force main, reaction blocking, thrust restraint, and station piping must be designed to withstand water hammer pressures and associated cyclic reversal of stresses that are expected with the cycling of wastewater pumping stations. If necessary, the use of surge valves, surge tanks, or other suitable means to protect the force main against severe pressure changes must be evaluated. (7-1-26) e. Force main construction near streams or water works structures and at water main crossings must meet applicable provisions of Section 430. (7-1-26) f. Design friction losses must be in accordance with an approved PER pursuant to Section 411.03.c. (7-1-26) g. Where force mains are constructed of material which might cause the force main to be confused with potable water mains, the force main must be appropriately identified using trench tape saying, “raw sewage,” “biohazard,” or other appropriate wording. (7-1-26) h. Leakage tests must be specified including testing methods and leakage limits. Testing must conform with Sections 401.3.6 and 505.3.3 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004. (7-1-26) i. Thrust blocking or restraint must conform with Sections 401.3.4 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004, or specific calculations reviewed and approved by the Department. (7-1-26) j. Isolation valves must be used if force mains connect into a common force main. (7-1-26) k. Force mains must be covered with sufficient earth or other insulation to prevent freezing or other physical damage. (7-1-26) 441. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: INDIVIDUAL SERVICE CONNECTION WASTEWATER PUMPING STATIONS. 01. General. Section 441 regulates individual service connection pump stations including individual grinder pump stations and individual septic tank effluent pump stations. Certain individual service connection wastewater pumping stations may be under the jurisdiction of the Idaho Division of Occupational and Professional Licensing. (7-1-26) a. Wastewater pumping station structures and electrical and mechanical equipment must be protected from physical damage by the one hundred (100) year flood. Wastewater pumping stations must remain fully IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 441 Page 33 operational and accessible during the twenty-five (25) year flood. Local, state and federal flood plain regulations must be considered. (7-1-26) b. The pumping station must be accessible by maintenance vehicles during all weather conditions. (7-1-26) 02. Design. Design of wastewater pumping stations must meet the applicable requirements of Subsections 441.02.a. through 441.02.c. (7-1-26) a. Duplex pumps for individual service connection wastewater pump stations are not required. However, for developments having five (5) or more similar facilities, one (1) working spare pump for each size will be readily available at all times. (7-1-26) i. Pumps handling raw wastewater will be capable of passing spheres of at least three (3) inches in diameter or be a grinder pump. (7-1-26) i. The pump will be placed so that, under normal operating conditions, it will operate under a positive suction head. (7-1-26) b. Water level control sensing devices will be designed to allow for automatic control of pumps. (7-1-26) c. Suitable means to facilitate pump removal and to prevent backflow shall be provided. All shutoff and check valves will be accessible for maintenance. (7-1-26) 03. Submersible Pump Stations - Special Considerations. (3-31-22) a. Submersible pumps and motors must be designed specifically for wastewater, including totally submerged operation during a portion of each pumping cycle. An effective method to detect shaft seal failure or potential seal failure must be provided. (7-1-26) b. Submersible pumps must be readily removable and replaceable without personnel entering or dewatering the wet well, or disconnecting any piping in the wet well. (7-1-26) c. Electrical equipment must comply with local and state codes. (7-1-26) i. Electrical supply, control, and alarm circuits must be designed to provide strain relief and to allow disconnection from outside the wet well. Terminals and connectors must be protected from corrosion by location outside the wet well or through use of watertight seals. (7-1-26) ii. The motor control center must be outside the wet well, 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 must be located so that the motor may be removed and electrically disconnected without disturbing the seal. (7-1-26) iii. Pump motor power cords must be designed for flexibility and serviceability under conditions of extra hard usage. Ground fault interruption protection must be used to de-energize the circuit in the event of any failure in the electrical integrity of the cable. Power cord terminal fittings must be corrosion-resistant and constructed in a manner to prevent the entry of moisture into the cable, provided with strain relief appurtenances, and designed to facilitate field connecting. (7-1-26) 04. Alarm Systems. Audio-visual alarm systems with a backup power source must be provided for pumping stations. The alarm must be activated in cases of wet well high water levels and visible from the outside of the structure. (7-1-26) 05. Emergency Operation. The pumping station must be sized to allow for one (1) day’s flow between the high water alarm and the building service invert or the pressure discharge pipe, whichever is closer to the IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 450 Page 34 high water alarm. (3-31-22) 06. Operation and Maintenance. An operation and maintenance manual must be submitted to and approved by the Department as required by Section 425. Adherence to the terms of this approved manual is required. The owner of the individual service connection wastewater pumping station is responsible for maintaining the pumping station in a manner that assures its designed operation. The owner of the wastewater pumping station must be supplied with a complete set of operational instructions, including emergency procedures, maintenance schedules, tools, and such spare parts as may be necessary. (7-1-26) 07. Force Mains. (3-31-22) a. A cleansing velocity of at least two (2) feet per second must be maintained within force mains at the design pumping rates. If the force main conveys effluent from a septic tank effluent pump system, a cleansing velocity of at least one (1) feet per second must be maintained at the design pumping rates. (7-1-26) b. Force main construction near streams or water works structures and at water pipeline crossings must meet applicable provisions of Section 430. (7-1-26) c. Design friction losses must be in accordance with an approved PER pursuant to Section 411.03.c. (7-1-26) d. Where force mains are constructed of material which might cause the force main to be confused with potable pipeline, the force main must be appropriately identified using trench tape saying, “raw sewage,” “biohazard,” or other appropriate wording. (7-1-26) e. Leakage tests must be specified including testing methods and leakage limits and conform with Sections 401.3.6 and 505.3.3 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004. (7-1-26) f. Thrust blocking must conform with Sections 401.3.4 of the “Idaho Standards for Public Works Construction,” incorporated by reference in Section 004. (7-1-26) g. Isolation valves must be used if force mains connect into a common force main. (7-1-26) h. Force mains must be covered with sufficient earth or other insulation to prevent freezing or other physical damage. (7-1-26) 442. – 449. (RESERVED) 450. FACILITY AND DESIGN STANDARDS FOR MUNICIPAL WASTEWATER SYSTEMS: WASTEWATER TREATMENT FACILITIES: GENERAL. 01. Plant Location. (3-31-22) a. The PER and facility plan must include a detailed discussion for new facilities regarding site selection criteria and alternatives considered. See Sections 410 and 411. (7-1-26) b. The treatment plant structures, electrical, and mechanical equipment must be protected from physical damage by the one hundred (100) year flood. Treatment plants must be designed to remain fully operational and accessible during the one hundred (100) year flood. This requirement applies to new construction and to existing facilities undergoing material modification. Local, state, and federal flood plain regulations must be considered. (7-1-26) c. Facilities open to the atmosphere such as wastewater lagoons, open clarifiers, open aeration basins, and other such facilities must be placed a minimum of two hundred (200) feet from residential property lines. For totally enclosed facilities with noise and odor controls, the minimum setback must be fifty (50) feet. A lesser setback may be considered by the Department on a case by case basis when considering factors including, but not limited to, IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 450 Page 35 anticipated land use, property zoning, quality of wastewater, or anticipated odors. Neighboring property owners may grant long term easements or other types of legal documents tied to the land to allow for similar setbacks from future development or public use. (7-1-26) 02. Quality of Effluent. The degree of wastewater treatment must be based on the effluent requirements established by the responsible state or federal agency. Combined sewer overflows are not allowed. (7-1-26) 03. Design. (3-31-22) a. The PER or facility plan must include a detailed discussion regarding criteria and alternatives considered in selecting the appropriate treatment type. See Sections 410 and 411. The plant design must provide the necessary flexibility to perform satisfactorily within the expected range of waste characteristics and volumes. (7-1-26) b. Department policy is to encourage the development of any valid methods or equipment for treatment of wastewater. The lack of inclusion in these standards of some types of wastewater treatment processes or equipment should not be construed as precluding their use. The Department may approve other types of wastewater treatment processes and equipment that meet the performance standards set forth in these rules under the condition that the operational reliability and effectiveness of the process or device must have been demonstrated under similar conditions with a suitably-sized unit operating at its design load conditions, to the extent required. To determine that such new processes and equipment or applications have a reasonable and substantial chance of success, the Department may require the following: (7-1-26) 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 flow rates (including diurnal variations) and waste temperatures over a sufficient length of time to demonstrate performance under climatic and other conditions which may be encountered in the area of the proposed installations. (7-1-26) iv. Appropriate testing be conducted and evaluations be made under the supervision of a competent process engineer other than those employed by the manufacturer or developer. (7-1-26) c. The design period must be clearly identified in the PER or facility plan described in Sections 410 and 411. (7-1-26) d. Hydraulic design flow conditions critical to the design of the treatment plant must be as described in the PER required by Section 411. (7-1-26) i. Initial low flow conditions must be 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. (7-1-26) ii. The treatment plant design capacity must be as described in the PER as required by Section 411. The plant design flow selected must meet the appropriate effluent and water quality standards that are set forth in the discharge or other appropriate permit. For plants subject to high wet weather flows or overflow detention pump-back flows, the design maximum flows that the plant is to treat on a sustained basis must be specified. (7-1-26) iii. Facilities for the equalization of flows and organic shock load must be considered at all plants which are critically affected by surge loadings. (7-1-26) e. Organic loadings for wastewater treatment plant design must be based on the information provided in the PER described in Section 411. The effects of septage flow which may be accepted at the treatment facility must IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 450 Page 36 be given consideration and appropriate facilities must be included in the design. See Section 520. (7-1-26) f. The shock effects of high concentrations and diurnal peaks for short periods of time on the treatment process, particularly for small treatment plants, must be considered. (7-1-26) g. All piping and channels must be designed to carry the maximum expected flows. Conduits must be designed to avoid creation of pockets and corners where solids can accumulate. (7-1-26) h. Suitable gates or valves must be placed in channels to seal off unused sections which might accumulate solids. The use of shear gates, stop plates or stop planks is permitted where they can be used in place of gate valves or sluice gates. Non-corrodible materials must be used for control gates and conduits. (7-1-26) i. Component parts of the plant must be arranged for appropriate operating and maintenance convenience, flexibility, economy, continuity of maximum effluent quality, and ease of installation of future units. (7-1-26) j. Flow division control facilities must be provided as necessary to ensure organic and hydraulic loading control to plant process units and must be designed for easy operator access, change, observation, and maintenance. Appropriate flow measurement facilities must be incorporated into the flow division control design. (7-1-26) k. An odor management plan must be submitted to and approved by the Department as a part of the PER described in Section 411. The Water Environment Federation Guidance referenced in Section 008 provides guidance for use in developing an odor management plan that is inclusive of the facilities being designed. (7-1-26) l. Facilities must be designed with regard for proper operation and maintenance and protection during cold weather temperatures expected at the specific location. The Water Environment Federation Guidance referenced in Section 008 provides guidance for use in designing, operating and maintaining facilities in cold weather. (7-1-26) 04. Plant Details. (3-31-22) a. Unit Bypasses. (3-31-22) i. Properly located and arranged bypass structures and piping must be provided so that each unit of the plant can be removed from service independently. The bypass design must facilitate plant operation during unit maintenance and emergency repair to minimize deterioration of effluent quality and ensure rapid process recovery upon return to normal operational mode. The actuation of all bypasses requires manual action by operating personnel. All power-actuated bypasses must be designed to permit manual operation in the event of power failure. (7-1-26) ii. Unit bypassing during construction must be in accordance with the PER described in Section 411. (7-1-26) b. Drains or sumps must be provided to completely dewater each unit to an appropriate point in the process. Due consideration must be given to the possible need for hydrostatic pressure relief devices to prevent flotation of structures. Pipes subject to plugging must be provided with means for mechanical cleaning or flushing. (7-1-26) c. Materials must be selected that are appropriate under conditions of exposure to hydrogen sulfide and other corrosive gases, greases, oils, and other constituents frequently present in wastewater. This is particularly important in the selection of metals and paints. (7-1-26) d. The contents and direction of flow must be identified on the piping in a contrasting color. (7-1-26) e. Tools, accessories, and spare parts necessary for the plant operator’s use must be provided. (7-1-26) f. Readily accessible storage and workspace facilities must be provided, and consideration must be IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 450 Page 37 given to provision of a garage for large equipment storage, maintenance, and repair. (7-1-26) g. Effective site erosion control must be provided during construction. (7-1-26) h. Upon completion of the plant, the ground must be graded and landscaped in accordance with the PER described in Section 411. (7-1-26) 05. Plant Outfalls. (3-31-22) a. The outfall must be designed to discharge to the receiving water in a manner acceptable to various reviewing authorities including, but not limited to, EPA, the Department, U.S. Army Corp of Engineers, Idaho Department of Water Resources, and local jurisdictions. (7-1-26) b. The outfall must be so constructed and protected against the effects of floodwater, ice, or other hazards as to reasonably ensure its structural stability and freedom from stoppage. Hazards to navigation must be considered in designing outfalls. (7-1-26) c. All outfalls must be designed so that a sample of the effluent can be obtained at a point after the final treatment process and before discharge to or mixing with the receiving waters. (7-1-26) 06. Essential Facilities. (3-31-22) a. All wastewater treatment plants must be provided with an alternate source of electric power or pumping capability to allow continuity of operation during power failures. Refer to Subsection 440.07.c. for design requirements. Methods of providing alternate sources include: (7-1-26) i. 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 must be done by the appropriate power provider and stated in a letter from that provider. (7-1-26) ii. In-place internal combustion engine equipment which will generate electrical or mechanical energy. (3-31-22) iii. 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 must be provided to allow time for detection of pump station failure and transportation and hookup of the portable equipment. (7-1-26) iv. Standby power-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) power outages have occurred, auxiliary power for minimum aeration of the activated sludge is required as provided in Subsections 450.06.a.i. and 450.06.a.ii. (7-1-26) v. Standby power-generating capacity, as provided in Subsections 450.06.a.i. and 450.06.a.ii., is required for disinfection facilities and dechlorination facilities. (7-1-26) b. Stairways must be installed in lieu of ladders for top access to units requiring routine inspection and maintenance (such as digesters, trickling filters, aeration tanks, clarifiers, tertiary filters, etc.). (7-1-26) c. Flow measurement devices must be provided to measure the plant influent or effluent flow. If influent flow is significantly different from effluent flow, both must be measured or otherwise accounted for by other flow measurement facilities. (7-1-26) i Other flow measurement must be provided if required by provisions of the discharge permit or as required for plant operational control such as return activated sludge, waste activated sludge, and recycled flow. (7-1-26) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.16 Department of Environmental Quality Wastewater Rules Section 455 Page 38 ii. Indicating, totalizing, and recording flow measurement devices for all influent or effluent flows must be provided for all plants. Any other flow measurement device may be indicating and totalizing only. All flow measurement equipment must be sized to function to a satisfactory level of accuracy over the full range of flows expected and must be protected against freezing. (7-1-26) iii. Flow measurement equipment including approach and discharge conduit configuration and critical control elevations must be designed to ensure the required hydraulic conditions necessary for the measurement accuracy needed for the specific application. (7-1-26) iv. The flow measurement devices must be calibrated and certified at manufacturer-specified frequencies. (7-1-26) d. Effluent composite sampling equipment must be provided at all mechanical plants and at other facilities where necessary to meet discharge permit monitoring requirements. Composite sampling equipment must also be provided as needed for influent sampling and for monitoring plant operations. The influent sampling point must be located prior to any process return flows. (7-1-26) 07. Safety. (3-31-22) a. Provisions must be made to consider the protection of maintenance personnel and visitors 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. (7-1-26) b. The materials utilized for storage, piping, valves, pumping, metering, splash guards, etc., must be specially selected considering the physical and chemical characteristics of each hazardous or corrosive chemical. (7-1-26) 08. Laboratory. (3-31-22) a. All treatment plants must include a laboratory for making the necessary analytical determinations and operating control tests, except for those plants utilizing only processes not requiring laboratory testing for plant control and where satisfactory off-site laboratory provisions are made to meet the permit monitoring requirements. The laboratory must have sufficient size, bench space, equipment, and supplies to perform all self-monitoring analytical work required by disposal permits, and to perform the process control tests necessary for good management of each treatment process included in the design. (7-1-26) b. Expected minimum laboratory needs must be addressed in the PER pursuant to Section 411. Treatment plant laboratory needs are divided into the following three (3) general categories: (7-1-26) i. Plants performing only basic operational testing; this typically includes pH, temperature, dissolved oxygen, and chlorine residual. (3-31-22) ii. Plants performing more complex operational and permit laboratory tests including biochemical oxygen demand, suspended solids, and fecal coliform analysis. (3-31-22) iii. Plants performing more complex operational, permit, industrial pretreatment, and multiple plant laboratory testing. (3-31-22) 09. Operation and Maintenance. An operation and maintenance manual must be submitted to and approved by the Department as required by Section 425. Adherence to the terms of this approved manual is required. The owner is responsible for maintaining the wastewater treatment facility in a manner that ensures its designed operation. (7-1-26) 451. -- 454. (RESERVED)