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Federal Register / Vol. 86, No. 24 / Monday, February 8, 2021 / Proposed Rules requested removal of Env-A 400 Sulfur Content Limits in Fuels, which currently exists in the New Hampshire SIP but has been superseded as a matter of state law by Env-A 1600. Env-A 400
is now a state regulation unrelated to sulfur limitations in fuels.
II. New Hampshires SIP Revision On March 11, 2019, the NH DES
submitted a SIP revision to EPA. This SIP revision includes Env-A 1600 Fuel Specifications, with amendments to Env-A 1603 and 1604 Sulfur Content Limitations effective December 21, 2018. The amended Env-A 1603 and 1604 lower the allowable limits for the sulfur content of liquid and solid fuels.
The submitted Env-A 1600 removes the provisions of the EPAs previously approved Env-A 400 related to sulfur content requirements for natural gas, as explained below in section III.c.
III. EPAs Evaluation of New Hampshires SIP Revision a. Liquid Fuels The previous SIP-approved Env-A 400
generally allowed for the use of distillate oil No. 2, No. 4 oil, and residual oil Nos. 5 and 6 with a sulfur in fuel limit containing 0.4% sulfur by weight, 1% sulfur by weight, and 2%
sulfur by weight, respectively.1 The submitted revised Env-A 1603 prohibits on and after July 1, 2018 the importation of, and prohibits on and after February 1, 2019 the sale or distribution except for fuel remaining in storage for a device not requiring a permit pursuant to RSA
125C:11 of, fuels having a sulfur content in excess of the limits contained in Table 1:

TABLE 1REVISED SULFUR CONTENT
OF LIQUID FUELS
Fuel type
Percent by weight
No. 2 oil, also referred to as distillate oil.
No. 4 oil
No. 5 oil or No. 6 oil, also referred to as residual oil.

0.0015% 15 parts million ppm.
0.25% 250 ppm.
0.5% 500 ppm.

In addition, Env-A 1603, Sulfur Content of Liquid Fuels prohibits the use of subject fuels at a stationary source or unit, and prohibits any person from supplying such fuels, having a sulfur content in excess of that in Table 2:

TABLE 2STATE APPROVED SULFUR
CONTENT OF LIQUID FUELS
Fuel type
Percent by weight
JP4 aviation fuel

0.4% 4,000 parts million ppm.
0.05% 500 ppm.
0.04% 400 ppm.
0.3% 3,000 ppm.

Aviation gasoline
Kerosene-1 oil
Kersonene-2 oil and Jet A, A1, B, and JP8
aviation fuels.
Used oil

2%.

Sulfur in fuel limits for these fuel types are not specified in the previously SIPapproved Env-A 400 and therefore this strengthens the SIP.
EPA finds that Env-A 1600 contains fuel sulfur limits which are more stringent than those in the original rule Env-A 400, and in addition, includes sulfur limits for additional fuels kerosene and several grades of aviation fuel which have not been previously addressed in the SIP.
b. Solid Fuels For solid fuel, the previous SIPapproved Env-A 400 required the use of coal with a maximum sulfur content of 2.8 pounds sulfur per million BTU gross heat content for existing sources, a three month weighted average of 2.0 pounds sulfur per million BTU for coal received for use in any stationary source for the generation of heat or power, and 1.5
pounds sulfur per million BTU gross heat content for sources placed in operation after April 15, 1970. Env-A
1604 Sulfur Content Limitations for Solid Fuels limits the maximum sulfur content in coal to the following:

TABLE 3REVISED SULFUR CONTENT
OF SOLID FUELS
Percent by weight Coal-burning device placed in operation before April 15, 1970.
Coal-burning device placed in operation on or after April 15, 1970.

2.8 pounds per million BTU lb/MBTU gross heat content.
1.5 lb/MBTU gross heat content.
1.0 lb/MBTU gross heat content average over any consecutive 3month period.

Env-A 1604 is silent on the previously approved three-month weighted average of 2.0 pounds sulfur per million BTU for coal received for use in any stationary source for the generation of heat or power. However, NH DESs SIP
submission points out that current federally approved permit operating conditions for the two stationary sources in the State put into operation prior to April 15, 1970 are more stringent than the previously approved sulfur in coal requirement in Env-A
400.2
c. Gaseous Fuels SIP-approved Env-A 400 requires that gaseous fuel natural and manufactured gas shall contain no more than 5 grains per 100 cubic feet of sulfur, calculated as hydrogen sulfide H2S, at standard conditions. Env-A 1600 does not include sulfur limits for gaseous fuels.
New Hampshires SIP submittal points out that the Federal Energy Regulatory Commission FERC determines the allowable sulfur content of natural gas in interstate pipelines. In addition, New Hampshires SIP submission states that Subchapter C of EPA regulations at 40
CFR 79.55 specifies that propane-based fuel, defined as gaseous motor vehicle fuel, marketed commercially as liquified petroleum gas LPG, whose primary constituent is propane shall have a sulfur limit, including odorant, as specified in the table below. In addition, commercial propane is sold in several grades and each grade has a sulfur content specification also shown in the table 4 below as published by the Gas Processors Association.

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TABLE 4SULFUR CONTENT OF GASEOUS FUELS
Fuel
ppmvd as S

gr/100 scf as H2S

Natural Gas
Natural Gas & Manufactured Gas
EPA 40 CFR 79.55 Table F94B Propane Based Fuel Specifications
GPA HD5 Propane industry standard

338
338
169

0.3
0.25
10

1 The residual oil limit for the Androscoggin Valley Air Quality Controls Region was 2.2% by weight.

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2 The coal sulfur limit of 2.0 lb sulfur per MMBtu is equivalent to an emission limit of 4.0 lbs SO2/
MMBtu averaged over any consecutive 3-month period. The subject facilities, Merrimack Station
PO 00000

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Sfmt 4702

gr/100 scf as S
20
20
7.7
10

and Schiller Station, have federally enforceable SO2
permit limits of 0.39 lb/MMBtu 7-day rolling average and 0.83 lb/MMBtu 24-hr calendar average, respectively.

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