S.D. Admin. R. 74:36:07:108

Current through Register Vol. 51, page 67, December 16, 2024

Section 74:36:07:108 - Specifications for active collection systems for existing municipal solid waste landfills

An active collection system at an existing municipal solid waste landfill shall meet the following specifications:

(1) Each owner or operator shall site active collection wells, horizontal collectors, surface collectors, or other extraction devices at a sufficient density throughout all gas producing areas using the following procedures unless alternative procedures have been approved by the Secretary:

(a) The collection devices within the interior shall be certified to achieve comprehensive control of surface gas emissions by a professional engineer. The following issues shall be addressed in the design: depths of refuse, refuse gas generation rates and flow characteristics, cover properties, gas system expandability, leachate and condensate management, accessibility, compatibility with filling operations, integration with closure end use, air intrusion control, corrosion resistance, fill settlement, resistance to the refuse decomposition heat, and ability to isolate individual components or sections for repair or troubleshooting without shutting down entire collection system;

(b) The sufficient density of gas collection devices shall address landfill gas migration issues and augmentation of the collection system through the use of active or passive systems at the landfill perimeter or exterior;

(c) The placement of gas collection shall control all gas producing areas, except as follows:

(i) Any segregated area of asbestos or nondegradable material may be excluded from collection if documented. The documentation shall provide the nature, date of deposition, location and amount of asbestos or nondegradable material deposited in the area, and shall be provided to the Secretary upon request;

(ii) Any nonproductive area of the landfill may be excluded from control, provided the total of all excluded areas can be shown to contribute less than one percent of the total amount of nonmethane organic compound emissions from the landfill. The amount, location, and age of the material shall be documented and provided to the Secretary upon request. A separate nonmethane organic compound emissions estimate shall be made for each section proposed for exclusion, and the sum of all such sections shall be compared to the nonmethane organic compound emissions estimate for the entire landfill.

(iii) The nonmethane organic compound emissions from each section proposed for exclusion shall be computed using the following equation:

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Q_i = nonmethane organic compound emission rate from the i^th section, megagrams per year;

k = Methane generation rate constant, year^-1;

L_O = Methane generation potential, cubic meters per megagram solid waste;

M_i = Mass of the degradable solid waste in the i^th section, megagram;

t_i = Age of the solid waste in the i^th section, years;

C_NMOC = Nonmethane organic compound concentration, parts per million by volume; and

3. 6×10^-9 = Conversion factor.

(iv) If the owner or operator is proposing to exclude, or cease gas collection and control from, nonproductive physically separated closed areas that already have gas collection systems, nonmethane organic compound emissions from each physically separated closed area shall be computed using either the equation in § 74:36:07:143 or subdivision 74:36:07:131(1)(c)(iii);

(d) The values for methane generation rate constant and nonmethane organic compound concentration determined in field testing shall be used if field testing has been performed in determining the nonmethane organic compound emission rate or the radii of influence which is the distance from the well center to a point in the landfill where the pressure gradient applied by the blower or compressor approaches zero. If field testing has not been performed, the default values for methane generation rate constant, methane generation potential, and nonmethane organic compound concentration provided in §§ 74:36:07:99 to 7:36:07:110, inclusive, or the alternative values from §§ 74:36:07:99 to 7:36:07:110, inclusive, shall be used. The mass of nondegradable solid waste contained within the given section may be subtracted from the total mass of the section when estimating emissions provided the nature, location, age, and amount of the nondegradable material is documented as provided in subdivision (1)(c)(i) of this section;

(2) Gas collection devices shall be constructed using the following equipment or procedures:

(a) The landfill gas extraction components shall be constructed of polyvinyl chloride, high density polyethylene pipe, fiberglass, stainless steel, or other nonporous corrosion resistant material of suitable dimensions to convey projected amounts of gases, withstand installation, static, and settlement forces, and withstand planned overburden or traffic loads. The collection system shall extend as necessary to comply with emission and migration standards. Collection devices such as wells and horizontal collectors shall be perforated to allow gas entry without head loss sufficient to impair performance across the intended extent of control. Perforations shall be situated with regard to the need to prevent excessive air infiltration;

(b) Vertical wells shall be placed so as not to endanger underlying liners and shall address the occurrence of water within the landfill. Holes and trenches constructed for piped wells and horizontal collectors shall be of sufficient cross-section so as to allow for their proper construction and completion including centering of pipes and placement of gravel backfill. Collection devices shall be designed so as not to allow indirect short circuiting of air into the cover or refuse into the collection system or gas into the air. Any gravel used around pipe perforations shall be of a dimension so as not to penetrate or block perforations; and

(c) Collection devices may be connected to the collection header pipes below or above the landfill surface. The connector assembly shall include a positive closing throttle valve, any necessary seals and couplings, access couplings and at least one sampling port. The collection devices shall be constructed of polyvinyl chloride, high density polyethylene, fiberglass, stainless steel, or other nonporous material of suitable thickness;

(3) Each owner or operator shall convey the landfill gas to a control system through the collection header pipe(s). The gas mover equipment shall be sized to handle the maximum gas generation flow rate expected over the intended use period of the gas moving equipment. The maximum gas generation flow rate for an existing collection system shall be based on its flow data. The maximum gas generation flow rate for a new collection system or an existing collection system with no flow data shall be determined in accordance with subdivision 74:36:07:112(1).

S.D. Admin. R. 74:36:07:108

46 SDR 064, effective 11/25/2019

General Authority: SDCL 34A-1-6.

Law Implemented: SDCL 34A-1-18.