S.D. Admin. R. 74:36:07:114

Current through Register Vol. 50, page 162, June 24, 2024

Section 74:36:07:114 - Existing municipal solid waste landfill compliance with surface methane operational standards

The owner or operator of an existing municipal solid waste landfill that meets the requirements of subdivision 74:36:07:111(4) shall comply with the following procedures for demonstrating compliance with the surface methane operational standards:

(1) After installation and startup of the gas collection system, the owner or operator shall monitor surface concentrations of methane along the entire perimeter of the collection area and along a pattern that traverses the landfill at no more than 30 meter intervals or a site-specific established spacing for each collection area on a quarterly basis using an organic vapor analyzer, flame ionization detector, or other portable monitor meeting the specifications provided in § 74:36:07:115;

(2) The background concentration shall be determined by moving the probe inlet upwind and downwind outside the boundary of the landfill at a distance of at least 30 meters from the perimeter wells;

(3) Surface emission monitoring shall be performed in accordance with 40 C.F.R. Part 60, Appendix A, Method 21, section 8.3.1 (July 1, 2018) except the probe inlet shall be placed within 5 to 10 centimeters of the ground. Monitoring shall be performed during typical meteorological conditions;

(4) Any reading of 500 parts per million or more above background at any location shall be recorded as a monitored exceedance. As long as the following actions are taken, the exceedance is not a violation of the operational requirements of subdivision 74:36:07:111(4):

(a) The location of each monitored exceedance shall be marked and the location and concentration recorded. For location, the owner or operator shall determine the latitude and longitude coordinates using an instrument with an accuracy of at least four meters. The coordinates shall be in decimal degrees with at least five decimal places;

(b) Cover maintenance or adjustments to the vacuum of the adjacent wells to increase the gas collection in the vicinity of each exceedance shall be made and the location shall be re-monitored within 10 calendar days of detecting the exceedance;

(c) If the re-monitoring of the location shows a second exceedance, additional corrective action shall be taken and the location shall be monitored again within 10 days of the second exceedance. If the re-monitoring shows a third exceedance for the same location, the action specified in subdivision (e) of this section shall be taken, and no further monitoring of that location is required until the action specified in subdivision (e) of this section has been taken;

(d) Any location that initially showed an exceedance but has a methane concentration less than 500 parts per million methane above background at the 10-day re-monitoring specified in subdivision (b) or (c) of this section shall be re-monitored one month from the initial exceedance. If the 1-month re-monitoring shows a concentration less than 500 parts per million above background, no further monitoring of that location is required until the next quarterly monitoring period. If the 1-month re-monitoring shows an exceedance, the actions specified in subdivision (c) or (e) of this section shall be taken; and

(e) For any location where monitored methane concentration equals or exceeds 500 parts per million above background three times within a quarterly period, a new well or other collection device must be installed within 120 calendar days of the initial exceedance. An alternative remedy to the exceedance, such as upgrading the blower, header pipes or control device, and a corresponding timeline for installation may be submitted to the Secretary for approval;

(5) The owner or operator shall implement a program to monitor for cover integrity and implement cover repairs as necessary on a monthly basis.

S.D. Admin. R. 74:36:07:114

46 SDR 064, effective 11/25/2019

General Authority: SDCL 34A-1-6.

Law Implemented: SDCL 34A-1-18.