Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 5 - STATE AIR POLLUTION CONTROL BOARD › Chapter 40 - EXISTING STATIONARY SOURCES › Part II - Emission Standards › Article 43 - Emission Standards for Municipal Solid Waste Landfills (Rule 4-43) › Section 9VAC5-40-5850 - Compliance

Current through Register Vol. 40, No. 24, July 15, 2024
A. The provisions
					 of 9VAC5-40-20(Compliance) apply.
B. Owners subject to 9VAC5-40-5820 shall
					 comply with the provisions of Part III (9VAC20-81-100 et seq.) of 9VAC20
					 Chapter 81 (Solid Waste Management Regulations) pertaining to the control of
					 landfill gases.
C. Except as
					 provided in 9VAC5-40-5820 C 2 a (2), the specified methods in subdivisions C 1
					 through C 6 of this section shall be used to determine whether the gas
					 collection system is in compliance with 9VAC5-40-5820 C 2 b.
1. For the purposes of calculating the
					 maximum expected gas generation flow rate from the landfill to determine
					 compliance with 9VAC5-40-5820 C 2 b (1) (a), one of the following equations
					 shall be used. The k and L sub0 kinetic factors should be those published in
					 the "Compilation of Air Pollutant Emission Factors (AP-42)" (see 9VAC5-20-21 )
					 or other site-specific values demonstrated to be appropriate and approved by
					 the board. If k has been determined as specified in 9VAC5-40-5860 B 4, the
					 value of k determined from the test shall be used. A value of no more than 15
					 years shall be used for the intended use period of the gas mover equipment. The
					 active life of the landfill is the age of the landfill plus the estimated
					 number of years until closure.
a. For sites
					 with unknown year-to-year solid waste acceptance rate:
QM =
						2L0R(e-kc -
						e-kt)
where
QM = maximum expected gas
						generation flow rate, cubic meters per year
L0 = methane generation potential,
						cubic meters per megagram solid waste
R = average annual acceptance rate, megagrams per
						year
k = methane generation rate constant,
						year-1
t = age of the landfill at equipment installation plus
						the time the owner or operator intends to use the gas mover equipment or active
						life of the landfill, whichever is less. If the equipment is installed after
						closure, t is the age of the landfill at installation, years
c = time since closure, years (for an active landfill c =
						0 and e-kc = 1)
b. For sites with known year-to-year solid
					 waste acceptance rate:
View Image
where
QM = maximum expected gas
						generation flow rate, cubic meters per year
k = methane generation rate constant,
						year-1
L0 = methane generation potential,
						cubic meters per megagram solid waste
Mi = mass of solid waste in the
						ith section, megagrams
ti = age of the
						ith section, years
c. If a collection and control system has
					 been installed, actual flow data may be used to project the maximum expected
					 gas generation flow rate instead of, or in conjunction with, the equations in
					 subdivisions C 1 a and b of this section. If the landfill is still accepting
					 waste, the actual measured flow data will not equal the maximum expected gas
					 generation rate, so calculations using the equations in subdivisions C 1 a or b
					 of this section or other methods acceptable to the board shall be used to
					 predict the maximum expected gas generation rate over the intended period of
					 use of the gas control system equipment.