Md. Code Regs. 26.11.42.06

Current through Register Vol. 51, No. 24, December 2, 2024

Section 26.11.42.06 - Requirements for the Permanent Shutdown and Removal of a Gas Collection and Control System

A. A gas collection and control system installed at a closed MSW landfill or closed area of a MSW landfill may be capped and permanently removed provided the following requirements are met:

(1) The gas collection and control system was in operation for at least 15 years, unless the owner or operator can demonstrate to the Department that due to declining methane rates the MSW landfill will be unable to operate the gas collection and control system for a 15-year period;

(2) The calculated or measured methane generation rate at the MSW landfill is less than 732 tons per year on three successive test dates, provided that:

(a) For measured methane generation rates, the test dates shall be no less than 90 days apart, and no more than 180 days apart; or

(b) The calculated methane generation rate shall be calculated in accordance with the provisions of Regulation .11D of this chapter;

(3) Surface methane concentration measurements do not exceed 200 ppmv;

(4) The concentrations of methane gas at the MSW landfill do not exceed 25 percent of the lower explosive limit in facility structures (excluding gas collection and control system components) or the lower explosive limit at the property boundary; and

(5) The owner or operator submits an equipment removal report to the Department in accordance with the provisions of Regulation .10(2) of this chapter.

B. The owner or operator of a MSW landfill that has capped or removed a gas collection and control system subject to §A of this regulation shall conduct instantaneous surface methane concentration measurements over the portion of the landfill with the capped or removed gas collection and control system in accordance with the procedures in Regulation .11F(1) and (2) of this chapter for at least eight consecutive calendar quarters after the gas collection and control system is capped or removed. The measurements shall comply with the following requirements:

(1) The walking grid in Regulation .11F(1)(d) of this chapter may be reduced to 100-foot spacing so long as the walking grid is offset by 25-feet each quarter so that by the end of 1 year of monitoring, the entire surface area has been monitored every 25 feet;

(2) If there is no measured concentration of methane of 200 ppmv or greater from the surface of the closed MSW landfill in any of these measurement events, the owner or operator shall submit a final gas collection and control system closure notification to the Department in accordance with the provisions in Regulation .10C(1) of this chapter; and

(3) If there is any measured concentration of methane of 200 ppmv or greater in any of these measurement events, other than nonrepeatable, momentary readings, as determined by instantaneous surface emissions monitoring from the surface of the closed MSW landfill, the owner or operator shall comply with the provisions in Regulation .09A(1) of this chapter.

Md. Code Regs. 26.11.42.06

Regulation .06 adopted effective 50:11 Md. R. 446, eff. 6/12/2023; amended effective 51:15 Md. R. 711, eff. 8/5/2024.