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TITLE 30ENVIRONMENTAL QUALITY
PART 1TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
CHAPTER 335INDUSTRIAL SOLID WASTE AND MUNICIPAL HAZARDOUS WASTE
SUBCHAPTER GLOCATION STANDARDS FOR HAZARDOUS WASTE STORAGE, PROCESSING, OR DISPOSAL
RULE §335.204Unsuitable Site Characteristics

the combined uncertainties in locating a fault trace, shall be determined by a licensed professional geoscientist or geotechnical engineer. For purposes of fault assessment under this paragraph, depths of shallow sediments to be considered could be as little as 100 feet (for older, slowly accumulated sediments), or as great as 300 feet (for younger, rapidly accumulated sediments). The fault study should include analyses of any electric logs developed for any required subsurface characterization of the site, interpretation of available aerial photographs, study of available maps, logs, and documents that may indicate fault locations at the surface and in the subsurface, and a visual observation of the proposed site.

(d) Storage surface impoundments.

  (1) A storage surface impoundment may not be located in the 100-year floodplain unless it is designed, constructed, operated, and maintained to prevent physical transport of any hazardous waste by a 100-year flood event. "Physical transport" does not include movement of hazardous waste by an owner or operator to move the hazardous waste to safety during the threat of a 100-year flood event.

  (2) A storage surface impoundment may not be located in wetlands.

  (3) A storage surface impoundment may not be located on the recharge zone of a sole-source aquifer.

  (4) A storage surface impoundment may not be located in areas overlying regional aquifers unless:

    (A) the regional aquifer is separated from the base of the containment structure by a minimum of ten feet of material with a hydraulic conductivity toward the aquifer not greater than 10 -7 cm/sec or a thicker interval of more permeable material which provides equivalent or greater retardation to pollutant migration; or

    (B) the impoundment is double-lined and has an intervening leak detection system or the facility has an equivalent design which provides commensurate or greater assurance of waste containment.

  (5) A storage surface impoundment may not be located in areas where soil unit(s) within five feet of the containment structure have a Unified Soil Classification of GW, GP, GM, GC, SW, SP, or SM, or a hydraulic conductivity greater than 10-5 cm/sec unless:

    (A) the impoundment is double-lined and has an intervening leak detection system or the facility has an equivalent design which provides commensurate or greater assurance of waste containment; or

    (B) the soil unit is not sufficiently thick and laterally continuous to provide a significant pathway for waste migration.

  (6) A storage surface impoundment may not be located in areas of direct drainage within one mile of a lake at its maximum conservation pool level, if the lake is used to supply public drinking water through a public water system, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from a release in such areas.

  (7) A storage surface impoundment may not be located in areas of active geologic processes unless the design, construction, and operational features of the facility will prevent adverse effects resulting from the geologic processes.

  (8) A storage surface impoundment may not be located within 1,000 feet of an area of active coastal shoreline erosion if the area is protected by a barrier island or peninsula, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from storm surge and erosion or scouring by water. On coastal shorelines which are subject to active shoreline erosion and which are unprotected by a barrier island or peninsula, a separation distance from the shoreline to the facility must be at least 5,000 feet unless the design, construction, and operational features of the facility will prevent adverse effects resulting from storm surge and erosion or scouring by water.

  (9) A storage surface impoundment may not be located in the critical habitat of an endangered species of plant and animal unless the design, construction, and operational features of the facility will prevent adverse effects on the critical habitat of the endangered species.

  (10) A storage surface impoundment may not be located on a barrier island or peninsula.

  (11) A storage surface impoundment may not be located within 30 feet of the upthrown side or 50 feet of the downthrown side of the actual or inferred surface expression of a fault that has reasonably been shown to have caused displacement of shallow Quaternary sediments or of man-made structures, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from fault movement. The presence, and if a fault is found to be present, the width and location of the actual or inferred surface expression of a fault, including both the identified zone of deformation and the combined uncertainties in locating a fault trace, shall be determined by a licensed professional geoscientist or geotechnical engineer. For purposes of fault assessment under this paragraph, depths of shallow sediments to be considered could be as little as 100 feet (for older, slowly accumulated sediments), or as great as 300 feet (for younger, rapidly accumulated sediments). The fault study should include analyses of any electric logs developed for any required subsurface characterization of the site, interpretation of available aerial photographs, study of available maps, logs, and documents that may indicate fault locations at the surface and in the subsurface, and a visual observation of the proposed site.

(e) Landfills. Any surface impoundment to be closed as a landfill (where wastes will remain after closure of the impoundment) is subject to the requirements for landfills.

  (1) Except as provided in subparagraphs (A) and (B) of this paragraph, a landfill may not be located in the 100-year floodplain existing prior to site development except in areas with flood depths less than three feet. Any landfill within the 100-year floodplain must be designed, constructed, operated, and maintained to prevent physical transport of any hazardous waste by a 100-year flood event.

    (A) The areal expansion of a landfill in a 100-year floodplain may be allowed by the commission if the applicant demonstrates to the satisfaction of the commission that the facility design will prevent the physical transport of any hazardous waste by a 100-year flood event.

    (B) A new commercial hazardous waste management facility landfill unit may not be located in a 100-year floodplain, unless the applicant demonstrates to the satisfaction of the commission that the facility design will prevent the physical transport of any hazardous waste by a 100-year flood event.

  (2) A landfill may not be located in wetlands.

  (3) A landfill may not be located on the recharge zone of a sole-source aquifer.

  (4) A landfill may not be located in areas overlying regional aquifers unless:

    (A) it is in an area where the average annual evaporation exceeds average annual rainfall by more than 40 inches and the depth to the regional aquifer is greater than 100 feet from the base of the containment structure; or

    (B) the regional aquifer is separated from the base of the containment structure by a minimum of ten feet of material with a hydraulic conductivity toward the aquifer not greater than 10 -7 cm/sec or a thicker interval of more permeable material which provides equivalent or greater retardation to pollutant migration.

  (5) A landfill may not be located in areas where soil unit(s) within five feet of the containment structure have a Unified Soil Classification of GW, GP, GM, GC, SW, SP, or SM, or a hydraulic conductivity greater than 10-5 cm/sec unless:

    (A) it is in an area where the average annual evaporation exceeds average annual rainfall by more than 40 inches; or

    (B) the soil unit is not sufficiently thick and laterally continuous to provide a significant pathway for waste migration.

  (6) A landfill may not be located within 1,000 feet of an established residence, church, school, day care center, surface water body used for a public drinking water supply, or dedicated public park which is in use at the time the notice of intent to file a permit application is filed with the commission, or if no such notice is filed, at the time the permit application is filed with the commission. The measurement of distances required for a new hazardous waste landfill shall be taken from a perimeter around the proposed new hazardous waste landfill. The perimeter shall be not more than 75 feet from the edge of the proposed new hazardous waste landfill unit.

  (7) A landfill at which hazardous waste is received for a fee may not be located in the 100-year floodplain of a perennial stream, delineated on a flood map adopted by the Federal Emergency Management Agency after September 1, 1985, as zone A1-99, VO, or V1-30. This provision shall not apply to any facility for which a notice of intent to file an application, or an application, has been filed with the commission as of September 1, 1985.

  (8) A landfill may not be located in areas of direct drainage within one mile of a lake at its maximum conservation pool level, if the lake is used to supply public drinking water through a public water system, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from a release in such areas.

  (9) A landfill may not be located in areas of active geologic processes unless the design, construction, and operational features of the facility will prevent adverse effects resulting from the geologic processes.

  (10) A landfill may not be located within 1,000 feet of an area subject to active coastal shoreline erosion, if the area is protected by a barrier island or peninsula, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from storm surge and erosion or scouring by water. On coastal shorelines which are subject to active shoreline erosion and which are unprotected by a barrier island or peninsula, a separation distance from the shoreline to the facility must be at least 5,000 feet unless the design, construction, and operational features of the facility will prevent adverse effects resulting from storm surge and erosion or scouring by water.

  (11) A landfill may not be located in the critical habitat of an endangered species of plant or animal unless the design, construction, and operational features of the facility will prevent adverse effects on the critical habitat of the endangered species.

  (12) A landfill may not be located on a barrier island or peninsula.

  (13) A landfill may not be located within 30 feet of the upthrown side or 50 feet of the downthrown side of the actual or inferred surface expression of a fault that has reasonably been shown to have caused displacement of shallow Quaternary sediments or of man-made structures, unless the design, construction, and operational features of the facility will prevent adverse effects resulting from fault movement. The presence, and if a fault is found to be present, the width and location of the actual or inferred surface expression of a fault, including both the identified zone of deformation and the combined uncertainties in locating a fault trace, shall be determined by a licensed professional geoscientist or geotechnical engineer. For purposes of fault assessment under this paragraph, depths of shallow sediments to be considered could be as little as 100 feet (for older, slowly accumulated sediments), or as great as 300 feet (for younger, rapidly accumulated sediments). The fault study should include analyses of any electric logs developed for any required subsurface characterization of the site, interpretation of available aerial photographs, study of available maps, logs, and documents that may indicate fault locations at the surface and in the subsurface, and a visual observation of the proposed site.

  (14) For purposes of this subchapter, any surface impoundment to be closed as a landfill (where wastes will remain after closure of the impoundment) is subject to the requirements for landfills.

(f) Injection Wells. The placement of any noncontainerized or bulk liquid hazardous waste in any salt dome formation, salt bed formation, underground mine, or cave is prohibited.


Source Note: The provisions of this §335.204 adopted to be effective May 28, 1986, 11 TexReg 2347; amended to be effective May 3, 1988, 13 TexReg 1913; amended to be effective November 7, 1991, 16 TexReg 6065; amended to be effective September 1, 2003, 28 TexReg 6915

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