Nebraska Administrative Code › Topic - ENVIRONMENT AND ENERGY › Title 123 - NEBRASKA DEPARTMENT OF ENVIRONMENTAL QUALITY › Chapter 5 - DESIGN STANDARDS AND SPECIFICATIONS › Section 123-5-001 - General Design Criteria Requirements

Current through June 17, 2024
001.01 Wastewater
  works will be designed in accordance with the design standards listed in this
  Title. Where specific standards are not included in this Title, the design
  engineer is to submit a proposed design to the Department for review and
  approval. The Department will consider approving designs that follow generally
  accepted engineering guidelines and standards published by national engineering
  societies, federal environmental agencies, public health boards, or in
  engineering textbooks used by accredited university engineering
  programs.
001.02 The hydraulic
  design of wastewater works will be based on historical flow records. In the
  absence of flow records, an average daily flow of at least 100 gallons per
  person per day from domestic sources is to be used. This includes a normal
  allowance for infiltration and inflow. Flow from commercial, institutional, and
  industrial sources is to be estimated from similar facilities that have
  historic flow records.
001.03 The
  organic loading rates used for designing wastewater treatment facilities is to
  be based on historical influent data, if at least one year of monthly sampling
  data exists. In the absence of such data, the design of wastewater treatment
  facilities are to use an organic loading rate of at least 0.17 pounds of
  five-day biochemical oxygen demand (BOD5) per person per day and a suspended
  solids loading rate of at least 0.20 pounds per person per day from domestic
  sources. The organic loading from commercial, institutional, and industrial
  sources is to be estimated from similar facilities that have loading
  records.
001.04 The design of
  discharging WWTF will be adequate to meet all NPDES permit limits. Flow
  measurement equipment and sampling locations will be included in the design as
  required to meet NPDES permit monitoring requirements.
001.05 The design of wastewater collection
  systems will not include overflow structures of any kind. The design of
  wastewater treatment facilities will not include passive or unvalved bypass
  structures that discharge to the ground surface or to waters of the
  state.
001.06 Wastewater works are
  to be designed to prevent untreated or partially treated wastewater from
  entering floodwaters of a 100-year flood and are to prevent floodwaters from
  entering the wastewater works. The deck of lift stations, the top of earthen
  dikes, and the top of all other structures designed to store, convey, or treat
  wastewater or sludge will be at least one foot above the 100-year flood
  elevation.
001.07 All WWTF are to
  have an alternative source of power to provide pumping of wastewater through
  the treatment facility. The alternative source of power will be adequate to
  pump the peak day flow rate. This requirement is to be met by either an engine
  generator or by a second independent electrical supply source. Storage and
  subsequent treatment may also be used to meet this requirement.
001.08 All WWTF that have disinfection units
  are to have backup power provided for the disinfection process.
001.09 Each WWTF is to be enclosed with a
  fence, unless exempted by the Department. Fences be at least 42-inches high and
  adequate to keep out grazing animals, if located in rural areas, or pets and
  unauthorized persons if located in public areas. Suitable warning signs are to
  be posted.
001.10 All weather
  access roads will be provided to wastewater works, as necessary, to maintain
  normal operations of the wastewater works.