Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 15 - USE OF SURFACE DISPOSAL OF BIOSOLIDS, APP. A-C
Part C - SURFACE DISPOSAL
Section 24 - Management practices

(a) Under the provisions of 40 CFR Part 503, the United State Environmental Protection Agency is authorized to ensure that bulk biosolids shall not be applied to the land if it is likely to adversely affect a threatened or endangered species listed under Section 4 of the Endangered Species Act or its designated critical habitat. No similar authority is provided to the Water Quality Division, Department of Environmental Quality.

(b) An active biosolids unit shall not restrict the flow of a base flood (i.e., a flood with a magnitude equaled once in 100 years).

(c) When a surface disposal site is located in a seismic impact zone, an active biosolids unit shall be designed to withstand the maximum recorded horizontal ground level acceleration.

(d) An active biosolids unit shall be located 60 meters or more from a fault that has displacement in Holocene time, unless otherwise specified by the permitting authority.

(e) An active biosolids unit shall not be located in an unstable area.

(f) An active biosolids unit shall not be located in a wetland, except as provided in a permit issued pursuant to Chapter 2, Wyoming Water Quality Rules and Regulations.

(g) Run-off from an active biosolids unit shall be collected and shall be disposed in accordance with National Pollutant Discharge Elimination System permit requirements and any other applicable requirements.

(h) The run-off collection system for an active biosolids unit shall have the capacity to handle run-off from a 24-hour, 25-year storm event.

(i) The leachate collection system for an active biosolids unit that has a liner and leachate collection system shall be operated and maintained during the period the biosolids unit is active and for three years after the biosolids unit closes.

(j) Leachate from an active biosolids unit that has a liner and leachate collection system shall be collected and shall be disposed in accordance with the applicable requirements during the period the biosolids unit is active and for three years after the biosolids unit closes.

(k) When a cover is placed on an active biosolids unit, the concentration of methane gas in air in any structure within the surface disposal site shall not exceed 25% of the lower explosive limit for methane gas during the period that the biosolids unit is active and the concentration of methane gas in air at the property line of the surface disposal site shall not exceed the lower explosive limit for methane gas during the period that the biosolids unit is active.

(l) When a final cover is placed on a biosolids unit at closure, the concentration of methane gas in the air in any structure within the surface disposal site shall not exceed 25% of the lower explosive limit for methane gas for three years after the biosolids unit closes and the concentration of methane gas in the air at the property line of the surface disposal site shall not exceed the lower explosive limit for methane gas for three years after the biosolids unit closes, unless otherwise specified by the permitting authority.

(m) A food crop, a feed crop, or a fiber crop shall not be grown on an active biosolids unit, unless the owner/operator of the surface disposal site demonstrates to the permitting authority that through management practices public health and the environment are protected from any reasonably anticipated adverse effects of pollutants in biosolids when crops are grown.

(n) Animals shall not be grazed on an active biosolids unit, unless the owner/ operator of the surface disposal site demonstrates to the permitting authority that through management practices public health and the environment are protected from any reasonably anticipated adverse effects of pollutants in biosolids when animals are grazed.

(o) Public access to a surface disposal site shall be restricted for the period that the surface disposal site contains an active biosolids unit and for three years after the last active biosolids unit in the surface disposal site closes.

(p) Biosolids placed on an active biosolids unit shall not contaminate an aquifer.

(q) Results of a ground water monitoring program developed by a qualified ground water scientist or a certification by a qualified ground water scientist shall be used to demonstrate that biosolids placed on an active biosolids unit does not contaminate an aquifer.