Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0009 - Solid Waste Management
Chapter 4 - CONSTRUCTION AND DEMOLITION LANDFILL REGULATIONS
Section 4-6 - Design and Construction Standards

Universal Citation: WY Code of Rules 4-6

Current through September 21, 2024

(a) Surveyed corners: All site boundary corners shall be surveyed and marked with permanent survey caps.

(b) Posting standards: Each point of access shall be identified by a sign, that shall be easily readable, maintained in good condition and that contains at a minimum the following information:

(i) For facilities not open to the public:
(A) Identification of the facility as a solid waste landfill.

(B) Wastes accepted for disposal at the facility.

(C) The position title and phone number of the responsible person to contact in the event of emergencies.

(ii) For public facilities:
(A) The facility name.

(B) The position title and phone number of the responsible person to contact in the event of emergencies.

(C) The hours of operation.

(D) Wastes accepted for disposal at the facility.

(E) Identification of the facility as a public facility.

(F) A requirement to notify the landfill operator of any asbestos wastes.

(c) Access road standards: Facility access roads shall be constructed to enable use under inclement weather conditions.

(d) Topsoil standards: Topsoil from all disturbed areas shall be stripped and stockpiled in an area that will not be disturbed during facility operation. These stockpiles shall be identified by signs, and vegetated for stabilization. This topsoil shall be used for site reclamation. Topsoil shall not be removed from the facility without written authorization from the Department.

(e) Structural stability: Engineering measures shall be incorporated into the landfill design to ensure stability of structural components in unstable areas and seismic impact zones.

(f) Surface water structures: Surface water diversion structures shall be sized to collect and control runoff from the active portion of the landfill from at least the water volume resulting from a 24-hour, 25-year storm and prevent flow onto the active portion of the landfill during the peak discharge from a 25-year storm.

(g) Sediment control: Sediment control structures shall be designed and constructed in accordance with the Water Quality Division Rules and Regulations.

(h) Slope stability for excavations: Trench wall slopes shall not exceed a ratio of 1.5:1 (horizontal:vertical) unless a slope stability analysis demonstrates steeper slopes can be safely constructed and maintained. This analysis may be based on site specific soil stability calculations or Wyoming Occupational Safety and Health Administration regulations for excavations.

(i) Buffer zones: A buffer zone of at least 20 feet shall be maintained within the perimeter boundary.

(j) Cover material: Sufficient cover material shall be available to properly operate the facility through the closure period.

(k) Engineered containment:

(i) The Administrator may require an engineered containment system, including a composite liner, leachate collection system, and final cover with a permeability less than or equal to the permeability of the bottom liner system, in new units and lateral expansions:
(A) If the facility design does not meet Department guidance or equivalent methods approved by the Administrator; or

(B) If the operator does not provide a performance-based design that demonstrates that concentrations of pollutants will not exceed groundwater protection standards at the relevant point of compliance established by the Administrator that is no more than 150 meters (492 feet) from the waste management unit boundary on land owned by the owner of the landfill.

(ii) Engineered containment systems, if required by the Administrator, shall be designed and constructed as specified in Chapter 2, Section 7(g) and (h).

Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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