§380.12. Environmental reports for Natural Gas Act applications.
18 C.F.R. § 380.12
(1) The seismic design basis and criteria that are, at a minimum, in accordance with all applicable Federal requirements, and applicable codes, standards, and specifications used as basis of design.
(2) A description of seismic setting and seismic hazard investigation.
(3) A description of seismological characteristics of the geographical region within 100 miles of the site.
(4) A description of capable faults, including any part of a fault within five miles of the site, the fault characteristics in the site vicinity, the methods and techniques used for fault analysis and investigations, and the potential effect of fault displacement on structures, systems, and components.
(5) Derivation of the site class describing the soil conditions and supportive geotechnical studies that are, at a minimum, in accordance with all applicable Federal requirements and applicable codes and standards.
(6) Criteria used to determine potential soil liquefaction, subsidence, fault rupture, seismic slope stability, and lateral spreading.
(7) A historical ground motion analysis, including a description of past seismic events of Modified Mercalli Intensity greater than IV or magnitude greater than 3.0 within 100 miles of the site, including date of seismic events, magnitude of seismic events, distance from site to epicenter of seismic events, depth of seismic events, and resultant ground motions recorded or estimated at site location.
(8) A site-specific ground motion analysis based on ground motions projected from the U.S. Geological Survey national seismic maps and any deterministic seismic hazard analyses (DSHA) and probabilistic seismic hazard analyses (PSHA).
(9) Derivation of all ground motions used for the Operating Basis Earthquake (OBE), Safe Shutdown Earthquake (SSE), site-specific design earthquake (DE), site-specific peak ground motion (PGA), and aftershock level earthquake (ALE) that are, at a minimum, in accordance with all applicable Federal requirements and applicable codes and standards.
(10) A list of OBE, SSE, and ALE site-specific ground motion spectral values for 0.5%, 1%, 2%, 5%, 7%, 10%, 15%, and 20% damping during all periods range.
(11) The DE seismic coefficients and seismic design parameters, including the spectral response acceleration and five percent damped design spectral response acceleration parameters at a short-period, at a period of one second, and at other periods; short-period site coefficient and long-period site coefficient; importance factor; component importance factor; fundamental period of the structure; long-period transition period; and response modification coefficient that are, at a minimum, in accordance with all applicable Federal requirements and applicable codes and standards.
(12) A description of site-specific response spectrum analysis method, time history analysis method, or equivalent static load analysis.
(13) A seismic analysis for soil-structure interaction that is, at a minimum, in accordance with all applicable Federal requirements and applicable codes and standards, and includes, at a minimum, a discussion of the modeling methods and the factors considered in the modeling methods, including the extent of embedment, the layering of the soil/rock strata, and the boundary of soil-structure model.
(14) A comparison of seismic responses used for each design classification for all structures, systems, and components.
(15) A list of seismic hazard curves of spectral accelerations for all periods for the site.
(16) Vertical response spectra for seismic design and ratio to horizontal response spectra.
(17) Natural frequencies and responses for each LNG tank system and associated safety systems and associated structures, systems, and components.
(18) A description of procedures used for structural analyses, including consideration of incorporating the stiffness, mass, and damping characteristics of the structural systems into the analytical models.
(19) A description of determination of seismic overturning moments and sliding forces for each LNG tank system and associated safety related structures, systems, and components, including consideration of the three components of input motion and the simultaneous action of vertical and horizontal seismic forces.
(20) A description of design procedure for seismically isolated structures, systems, and components.
(21) A description of seismic design basis and criteria for the LNG storage tank(s) and foundation(s). The seismic design basis and criteria must include the flexibility of the tank shell(s) and its influence on the natural frequencies of the tank(s), liquid level, effects of liquid motion or pressure changes; minimum design freeboard; sloshing and impulsive loads; seismic coefficients; importance factor(s); reduction factor(s); slosh height(s); sloshing periods of LNG storage tank(s); global stability of the tank(s) in terms of the potential for overturning and sliding; differential displacement between the tank(s) and the first support; and a total settlement monitoring program for the tank foundation(s).
(22) A description of seismic monitoring system in accordance with, at a minimum, all applicable Federal requirements and applicable codes and standards, including any triaxial ground motion recorder installed to register the free-field ground motion and additional triaxial ground motion recorders on each LNG tank system foundation, LNG tank roof, and associated safety related structures, systems, and components. The proposed seismic monitoring must include the installation locations on a plot plan; description of the triaxial strong motion recorders or other seismic instrumentation; the proposed alarm set points, and operating procedures (including emergency operating procedures) for control room operators in response to such alarms/data obtained from seismic instrumentation; and maintenance procedures.
(23) A cross reference to potential for earthquake generated tsunamis and seiches provided in paragraph (o)(15)(iii)(B) of this section, earthquake generated floods in paragraph (o)(15)(iii)(C) of this section, earthquake generated landslides in paragraph (o)(15)(iii)(G) of this section, and earthquake generated releases and fires in paragraph (m) of this section.
(1) The tsunami and seismic design basis and criteria with a description of the applicable requirements and guidelines, and generally accepted codes, standards, and specifications used as basis of design.
(2) The seiche design inundation and run-up elevations and corresponding return periods for all structures, systems, and components.
(3) The maximum considered tsunami (MCT) inundation and run-up elevation for the site, including the maximum considered earthquake (MCE) level ground motions at the site if the MCE is the triggering source of the MCT.
(4) A comparison of design loads of seiche water inundation elevations with inundation elevation corresponding to return periods of MCE and MCT for all structures, systems, and components.
(5) The Tsunami Risk Category for the site and a description of potential tsunami generation by seismic sources, and the prevention and mitigation plan for potential tsunami and seiche hazards.
(6) A cross reference to potential tsunami and seiche generated floods in paragraph (o)(15)(iii)(C) of this section, tsunami and seiche generated landslides in paragraph (o)(15)(iii)(G) of this section, and tsunami and seiche generated releases and fires in paragraph (m) of this section.
(1) The floods design basis and criteria with references to applicable requirements and guidelines, and generally accepted codes, standards, and specifications used as basis of design.
(2) A description of flooding potential in the region surrounding the site due to one or more natural causes such as storm surge, tides, wind generated waves, meteorological tsunamis or seiches, extreme precipitation, or other natural hazard events that have a common cause.
(3) A comparison of flood design loads corresponding to return periods of 10,000-year, 5,000-year, 1,000-year, 500-year, and 100-year for all structures, systems, and components.
(4) A discussion of final designed site elevations and storm surge walls or floodwalls for the site that includes tsunami considerations, flood design considerations, site total settlements, sea level rise, subsidence.
(1) The wind and storm surge design basis and criteria that are, at a minimum, in accordance with all applicable Federal requirements, and applicable codes, standards, and specifications used as basis of design.
(2) A comparison of design wind loads for both sustained and three-second gusts and storm surge elevations, including consideration for still water, wind/wave run-up effects, and crest elevations, with hurricanes and other meteorological events at the site location corresponding to return periods of 10,000-year, 5,000-year, 1,000-year, 500-year, and 100-year for all structures, systems, and components.
(3) A discussion of historic hurricane frequencies and hurricane categories equivalent on the Saffir-Simpson Hurricane Wind Scale at the site and associated wind speeds and storm surge.
(4) The design regional subsidence that includes a discussion of the elevation change used to account for regional subsidence for the design life of the facilities at the site.
(1) The tornadoes design basis and criteria that are, at a minimum, in accordance with all applicable Federal requirements, and applicable codes, standards, and specifications used as basis of design.
(2) A comparison of tornado design loads corresponding to return periods of 10,000-year, 5,000-year, 1,000-year, 500-year, and 100-year for all structures, systems, and components.
(3) A discussion of historic tornado frequencies and tornado categories as classified on the Enhanced Fujita (EF) Scale at the site and associated wind speeds.
(4) A discussion of tornado loads determination and design procedure.
(5) A comparison of impact between wind loads and tornado loads for the site.
(1) The rain, ice, and snow design basis and criteria that are, at a minimum, in accordance with all applicable Federal requirements, and applicable codes, standards, and specifications used as basis of design.
(2) The identification of stormwater flows, outfalls, and stormwater management systems for all surfaces, including spill containment system with sump pumps or other water removal systems.
(3) The comparison of rain, ice, and snow design loads with rainfall rates, snow loads, and ice loads corresponding to return periods of 10,000-year, 5,000-year, 1,000-year, 500-year, and 100-year for all structures, systems, and components.
(4) A discussion of historic ice and blizzard events and frequencies and other ice and snow events at the site and associated loads.
(1) The landslides, wildfires, volcanic activity, and geomagnetism design basis and criteria that are, at a minimum, in accordance with all applicable Federal requirements, and applicable codes, standards, and specifications used as basis of design.
(2) A discussion of historic landslide, wildfire, volcano activity, and geomagnetic disturbance risks and intensities at the site.
(3) A description of capable volcanoes, volcanic characteristics of the region, and a discussion of potentially hazardous volcanic phenomena considerations.
Notes, amendments, and revision history
Amendments
[Order 603, 64 FR 26611, May 14, 1999, as amended by Order 603-A, 64 FR 54537, Oct. 7, 1999; Order 609, 64 FR 57392, Oct. 25, 1999; Order 699, 72 FR 45328, Aug. 14, 2007; Order 756, 77 FR 4895, Feb. 1, 2012; Order 900, 88 FR 74042, Oct. 30, 2023]
Authority
Authority: 42 U.S.C. 4321-4370h, 7101-7352; E.O. 12009, 3 CFR 1978 Comp., p. 142.
Source
Source: Order 486, 52 FR 47910, Dec. 17, 1987, unless otherwise noted.
Amendments
[Order 603, 64 FR 26611, May 14, 1999, as amended by Order 603-A, 64 FR 54537, Oct. 7, 1999; Order 609, 64 FR 57392, Oct. 25, 1999; Order 699, 72 FR 45328, Aug. 14, 2007; Order 756, 77 FR 4895, Feb. 1, 2012; Order 900, 88 FR 74042, Oct. 30, 2023]