San Juan Coal Company

Plain-English summary

San Juan Coal contested a citation alleging that oxygen levels in an area beside the last longwall shield were below the required minimum. The judge found that the area had been effectively dangered off on the inspection date and was not an area where persons worked or traveled under the cited air-quality standard. The judge also found that the danger sign was an appropriate required response to the hazardous condition. Citation No. 7605607 was vacated.

Decision snapshot

• Cited standard: 30 C.F.R. § 75.321(a)(1)
• Outcome: Citation No. 7605607 was vacated.
• Key point: The air-quality requirement applied only to an area where persons worked or traveled, and the dangered-off area did not meet that description on the inspection date.

Full text (FMSHRC public release)

SAN JUAN COAL COMPANY -- May 25, 2004

FEDERAL MINE SAFETY AND HEALTH REVIEW COMMISSION

OFFICE OF ADMINISTRATIVE LAW JUDGES

601 New Jersey Avenue, NW, Suite 9500

Washington, DC 20001

May 25, 2004

SAN JUAN COAL COMPANY, : CONTEST PROCEEDING
Contestant :
: Docket No. CENT 2004-35-R
: Citation No. 7605607; 11/10/2003
v. :
:
SECRETARY OF LABOR, :
MINE SAFETY AND HEALTH : San Juan South Mine
ADMINISTRATION, (MSHA), : Mine ID No. 29-02170
Respondent :

DECISION

Appearances:  Timothy M. Biddle, Esq., Crowell & Moring, LLP, Washington, D.C., on behalf of Contestant;
Timothy S. Williams, Esq., U.S. Department of Labor, Office of the Solicitor, Arlington, Virginia, on behalf of Respondent.

Before:  Judge Zielinski

This case is before me on a Notice of Contest filed by the San Juan Coal Company ("San
Juan") pursuant to section 105 of the Federal Mine Safety and Health Act of 1977 ("Act"),
30 U.S.C. � 815. The notice challenges the validity of a citation issued by the Secretary of
Labor's Mine Safety and Health Administration ("MSHA") on November 10, 2003. Citation No.
7605607 alleges a violation of air quality standards in an area adjacent to the last shield on the
tailgate side of San Juan's longwall panel. San Juan contends that the site of the alleged
violation is not an area where persons work or travel, rendering the regulation inapplicable.
A hearing was held in Farmington, New Mexico, and the parties submitted briefs following
receipt of the transcript. For the reasons set forth below, I find that San Juan did not commit the
alleged violation and vacate the citation.

Findings of Fact -- Conclusions of Law

San Juan operates the San Juan South Mine, an underground coal mine located near
Farmington, New Mexico, where longwall equipment is used to extract coal from a seam that is
10-12 feet thick. A double-drum shearing machine travels back and forth across the 1,000 foot
coal face, depositing coal onto a chain conveyor, which moves it to the headgate side of the
longwall where it is loaded out by belt conveyor. Temporary roof support is provided by 178
shields, which are advanced by a computerized system as the shearer advances the face. Each
shield has a base, with "toes" that extend toward the face. Two hydraulic cylinders apply
pressure between the base and the upper portion of the shield that extends out over the shield toes
and longwall equipment, pressing against the mine roof. Miners travel along the face by walking
on the toes of the shields, in the space between the shearer/conveyor equipment and the shields'
hydraulic cylinders.

There are three entries to the longwall face. Two are located at the headgate. They
provide both the primary and alternate escapeways, a path for intake air to ventilate the face, and
space for transport of miners and equipment, as well as conveyor belts to remove coal from the
mine. The entry at the tailgate provides a path for return air. It also must be maintained as an
escapeway, except in limited circumstances.1 The entries were driven with continuous mining
machines and their roofs are supported by bolts, wire mesh and cable trusses.

As with any longwall mining operation, the roof is supported only temporarily by the
shields. As the longwall shearing machine and shields advance, the unsupported roof is allowed
to fall into the area behind the shields, the "gob." 2 The roof generally falls as the support
provided by the shields is removed. However, roof falls in the entries, where the roof is
supported by bolts, are more sporadic. Tr. 368-69. In the tailgate entry, for example, the roof
may not fall until the face has advanced as much as 20 or 30, or even 100 feet. Tr. 229. More
importantly, the falling roof can pull down the roof adjacent to the shields. San Juan has
experienced tailgate roof falls three feet outby the shield legs, and, on one occasion, as far as the
face. Tr. 269-71. In order to prevent rocks and other debris from entering the working area
under the shields, a two-inch thick steel plate is mounted on the outside of the last shield. That
plate, which will be referred to as the gob separation plate, is approximately three feet high, and
is attached to the shield by a hinge, which allows it to move as the shield advances. The longwall
drive equipment housing also has heavy plate on the tailgate side.

San Juan's mine liberates large amounts of methane and is subject to inspections by
MSHA every five days, pursuant to section 103(i) of the Act. In addition, the coal in San Juan's
mine has characteristics that make it susceptible to spontaneous combustion. To address these
problems, San Juan employs a bleederless ventilation system, does not allow wood products in
the mine, and has an exacting cleaning program. The ventilation system is designed to achieve
substantial air flow across the face and to reduce the oxygen content of the atmosphere in the gob
to below five percent as soon as possible. Under the mine's approved ventilation plan, 65,000 to
100,000 cubic feet of air per minute flows in the headgate entry, across the face and out the
tailgate entry.3 In order to reduce the concentration of oxygen in the gob, the gob atmosphere is
ventilated to the surface. Six-inch diameter boreholes are drilled from the surface on 500-foot
centers down to close proximity to the top of the coal seam.4 As the longwall face advances and
the roof of the gob falls, the boreholes are opened to the surface. Pumps at the top of the
boreholes draw air out of the gob. That air is replaced by nitrogen, which is injected into the gob
through seals separating it from an adjoining entry.

The large quantity of air ventilating the face of the longwall tends to cause the low-
oxygen gob atmosphere to remain in the gob, and quickly dilutes and renders harmless any gob
atmosphere that infiltrates through the spaces between the shields. However, San Juan has had
difficulty maintaining air quality in an area in the tailgate entry adjacent to the last shield. As the
air current ventilating the face sweeps around the corner of the face and out the tailgate entry it
has a tendency to draw low-oxygen atmosphere out of the gob, especially when outside
atmospheric pressure declines. The oxygen content of the air in that area, where gob atmosphere
mixes with ventilation air, can drop below 19.5%, the concentration required in areas where
persons work or travel. 30 C.F.R. � 75.321(a).

The area where low concentrations of oxygen have been found is depicted on exhibit C-4
as a rectangle labeled "AA," and has been referred to throughout this proceeding as the "Affected
Area." 5 It extends across the 18-20 foot width of the tailgate entry from the last shield to the rib.
The inby border, a line starting at the shield legs drawn perpendicular to and across the entry,
represents MSHA's view of the extreme inby active workings of the section. The outby border is
represented by a line approximately 12 feet from the inby border. The most problematic portion
of the Affected Area is in the lower right corner and along the rib. Tr. 343.

Events of November 10 - 16, 2003

On November 10, 2003, William E. Vetter, an experienced MSHA inspector, conducted a
spot inspection of the mine pursuant to section 103(i) of the Act. He reviewed the mine's
preshift inspection books and noted that low concentrations of oxygen, 18.3-19.4%, had been
reported in the tailgate area of the longwall several times from November 6 through 10. The
reports described the corrective action taken, i.e., the area had been "dangered off." He spoke to
David Hales, San Juan's safety manager, and Scott Langly, the mine manager, and was told that
San Juan's attorney had advised that adverse observations should be recorded, along with the
corrective action, and that the tailgate blockage plan should not be implemented because the
tailgate travelway was not, in fact, blocked.

Vetter knew that there had been repeated problems maintaining oxygen levels in the area
and had been "trying to work with" San Juan, employing a flexible enforcement policy. Tr. 122-

23. If he found low oxygen in the area, he did not issue a citation if San Juan had detected the
    problem and was working to correct it.6 Tr. 120. On November 10, he was concerned that low
    oxygen levels had been found periodically over four days and that the only corrective action that
    had been taken was that the area had been dangered off. He believed that it was permissible to
    danger off the area temporarily, but not as a permanent fix, and it "look[ed] like it [was] going to
    be permanent." Tr. 124-25. He called MSHA supervisory personnel in Denver, Colorado, and
    was advised to travel underground and enforce the regulation, which he interpreted to mean that
    he was to inspect the Affected Area and issue a citation if he found low oxygen. He traveled to
    the tailgate area of the longwall and observed a "danger" sign posted so as to bar persons from
    passing through an opening, or "notch," in the gob separation plate adjacent to the shield's toes.
    He advised San Juan personnel that it was not permissible to danger off the area in lieu of taking
    other actions to correct the problem. The sign was taken down, and he entered the Affected
    Area, holding a multi-function atmospheric monitoring system ("AMS") meter in front of him.
    As he proceeded, he observed meter readings showing low levels of oxygen, as well as elevated
    levels of methane. He took two bottle samples of air and issued Citation No. 7605607, alleging a
    violation of 30 C.F.R. � 75.321(a)(1), which requires that air in "areas where persons work or
    travel" contain a minimum of 19.5% oxygen. Ex. S-3. Vetter's observations were recorded in
    the "condition or practice" section of the form as follows:

The air quality in an area of the working section (MMU-010), LW102 tailgate,
was not being maintained to contain at least 19.5% oxygen. The oxygen level
ranged from 18.8% to 19.3% at a location 8 feet from the coal rib, 2 feet from the
roof, and aligned with the tailgate shield walkway and at a location 3 feet from the
rib and 3.5 feet from the roof the oxygen level ranged from 16.5% to 17.3%. This
area of inadequate air quality extended along the rib from the extreme inby active
workings to a point approximately 12 feet outby. Bottle samples E0313 and
E0341 were collected from the aforementioned locations.

Vetter determined that the violation was unlikely to result in an injury, and that it was not
significant and substantial. He assessed the operator's negligence as moderate, because the area
had been dangered off. He specified that the condition was to be corrected by November 12,
2003, at 1400 hours. That deadline was subsequently extended and the condition was abated on
November 16, 2003, after San Juan implemented an amendment to its ventilation plan
establishing a diffusion zone further outby in the tailgate travelway. Implementation of the plan
amendment did not permanently remedy the problem, although it "appeared to have helped for a
period of time." Tr. 69. The company eventually stopped using the diffusion zone, and MSHA
subsequently rescinded its approval of the amendment, because it resulted in other hazards that
could not be effectively addressed.7 Tr. 80-81.

The Dispute

30 C.F.R. � 75.321, provides, in pertinent part:

� 75.321 Air Quality

(a)(1) The air in areas where persons work or travel, except as specified in
paragraph (a)(2) of this section, shall contain at least 19.5 percent oxygen and not
more than 0.5 percent carbon dioxide, and the volume and velocity of the air
current in these areas shall be sufficient to dilute, render harmless, and carry away
flammable, explosive, noxious, and harmful gases, dusts, smoke and fumes
(emphasis added).

The issue to be decided is whether section 75.321(a)(1) applies at the locations where low
oxygen levels were found. In other words, on November 10, 2003, was the Affected Area an
area where persons work or travel, within the meaning of the regulation.8 While the parties
advance strongly opposing views on that issue, they agree that the regulatory language is
unambiguous, and that application of the plain meaning of the phrase "work or travel" dictates an
outcome in their favor.9

The rules governing statutory and regulatory interpretation are well-settled, though their
application may prove difficult. As the Commission recently explained in Cannelton Industries,
Inc., 26 FMSHRC 146, 150-51 (Mar. 2004):

The "language of a regulation . . . is the starting point for its
interpretation." Dyer v. United States, 832 F.2d 1062, 1066 (9th Cir. 1987) (citing
Consumer Prod. Safety Comm'n v. GTE Sylvania, Inc., 447 U.S. 102, 108
(1980)). Where the language of a regulatory provision is clear, the terms of that
provision must be enforced as they are written unless the regulator clearly
intended the words to have a different meaning or unless such a meaning would
lead to absurd results. See id.; Utah Power & Light Co., 11 FMSHRC 1926, 1930
(Oct. 1989); Consolidation Coal Co., 15 FMSHRC 1555, 1557 (Aug. 1993). . . .

"In determining the meaning of regulations, the Commission . . . utilizes
'traditional tools of . . . construction,' including an examination of the text and the
intent of the drafters." Amax Coal Co., 19 FMSHRC 470, 474 (Mar. 1997)
(quoting Local Union [1261, UMWA v. FMSHRC, 917 F.2d 42, 44-46 (D.C. Cir.
1990)]). In a plain meaning analysis, a provision at issue must be considered in
the context of the language and design of the Secretary's regulations as a whole.
New Warwick Mining Co., 18 FMSHRC 1365, 1368 (Aug. 1996); see Meredith v.
FMSHRC, 177 F.3d 1042, 1053-54 (D.C. Cir. 1999) (stating that reading the plain
words of a provision literally can carry a different meaning than intended;
meaning of the language, plain or not, depends on the context). The Secretary's
regulations should be interpreted to give comprehensive, harmonious meaning to
all provisions. New Warwick, 18 FMSHRC at 1368. Additionally, "a regulation
must be interpreted so as to harmonize with and not conflict with the objective of
the statute it implements." Emery Mining Corp. v. Sec'y of Labor, 744 F.2d 1411,
1414 (10th Cir. 1984) (citations omitted); see also Canterbury Coal Co.,
20 FMSHRC 718, 721-22 (July 1998) (referring to both Mine Act and regulatory
history in plain meaning analysis).

Work or Travel in the Affected Area

The Secretary contends, and San Juan does not dispute, that persons have worked and
traveled in the Affected Area on numerous occasions prior to November 10, 2003, and thereafter.
It is also undisputed that, on November 10, Vetter and others entered the area for the inspection
and miners were later required to enter the area to install and maintain ventilation controls.
However, San Juan contends that no one could work or travel in the dangered off Affected Area
on November 10, 2003, that no one was scheduled to work or travel in the Affected Area under
normal work conditions, and that persons have entered the Affected Area only because MSHA
has insisted that it be maintained as active workings.

San Juan had been a surface mine. It started its underground longwall operations about
one year before the citation was issued. When it developed its ventilation and other plans, it
originally proposed to bar persons from entering the Affected Area. However, MSHA rejected that proposal, and required that the area be treated as active workings, mandating preshift
examinations and compliance with the ventilation standard.10 Tr. 265-67.

It was not necessary for an examiner to physically enter the Affected Area in order to
conduct the preshift examination. The existence of hazards was typically determined through
visual inspection from adjacent locations under the shield or in the tailgate travelway, and air
quality was checked by extending an AMS meter into the area on a probe. When low oxygen
levels were detected, however, miners often had to enter the area to install or adjust ventilation
control devices, typically air curtains, to address the problem. On one occasion, a miner entered
the Affected Area to retrieve an AMS meter that had fallen from a probe. Tr. 47-48.

The Secretary asserts, based upon non-specific hearsay statements, that miners enter and
work in the Affected Area to service and maintain the longwall equipment. However, I reject
that assertion. Scott Jones, an engineer and longwall coordinator, testified as an expert on
longwall equipment and operations. He participated in the design of San Juan's longwall,
coordinating with the original equipment manufacturer, Joy Mining. Jones explained that the
equipment was designed to assure that no one would go beyond the last shield, i.e., into the
Affected Area. No equipment is accessible from that area, and no servicing or maintenance of
the longwall equipment can be done from the Affected Area. As noted above, the longwall drive
equipment is protected by heavy steel plate on the side that faces the tailgate entry, and the gob
separation plate protects the lower portion of the last shield. Servicing and maintenance of the
longwall equipment is performed from positions under the shields. A catastrophic failure of the
longwall drive, that would necessitate replacement of the motor or transmission, may require that
work be performed in the Affected Area. However, in 18 months of operation, that has been
required only once.

Miners travel from the face into the tailgate travelway for a number of reasons. Various
ventilation control devices, including a gob isolation stopping, are located outby in the tailgate
travelway, and must be inspected every shift. Miners also enter the tailgate travelway to maintain
AMS components and dewatering pumps, and perform other tasks. The tailgate travelway must
be maintained as an escapeway. It is also the return air course, and air courses must be inspected
weekly.

There are two routes from the face to the tailgate travelway. The route that San Juan has
designated for such travel, and has trained its miners to follow, starts under the shields near the
longwall drive. The mining equipment must be deenergized and locked-out, after which the
miner steps up onto and across the face conveyor, which typically would have some coal on it,
and travels along the face into the tailgate travelway. That route is depicted on exhibit C-4 as a
hand-drawn line (green on the original) with an arrowhead at its end in the tailgate travelway.
A miner following that route would not enter the Affected Area.11

The second route passes through the Affected Area. From the end of the walkway along
the toes of the shields, a miner could step through the notch in the gob separation plate, crawl or
walk over rubble from roof falls, travel through the Affected Area, and enter the tailgate
travelway. Tr. 280. When a preshift examination disclosed no ventilation or other hazards in the
Affected Area, miners were free to enter, work in, and travel through it during the subsequent
shift. Many have done so, both before and after the citation was issued.

While San Juan disputes the Secretary's assertion that miners found it more "convenient"
to travel through the Affected Area to reach the tailgate travelway, it does not dispute that
miners, including foremen, used that route. It also does not dispute that miners are required to
enter the Affected Area to maintain ventilation controls required by MSHA, because of its
insistence that the area be maintained as an active working area.

I find that persons frequently traveled through the Affected Area, prior to and after
November 10, 2003, in order to perform various tasks outby in the tailgate travelway. With the
exception of actions required to address ventilation problems, all such travel occurred after a
preshift examination had been conducted and the area was found to be free of hazards. Persons
have also been required by MSHA to be in the Affected Area to conduct inspections and
maintain ventilation controls, because of its determination that the area must be maintained as an
active working area. Vetter entered the Affected Area on November 10 to perform the
inspection, and others entered it after the citation was issued, in order to take corrective action.
Persons are not required to enter the Affected Area to perform service or maintenance on the
longwall equipment.

San Juan has consistently maintained that the Affected Area is not an area where persons
should work or travel, and that its miners should not be exposed to the hazard of roof falls.
Because of that hazard, San Juan's miners have complained about being forced to enter the
Affected Area. Contestant's exhibit C-9 is a photograph, taken through the opening in the gob
separation plate, depicting fallen roof in the Affected Area. Tr. 282. Exhibit C-5 is a copy of an
MSHA accident report form submitted by San Juan on December 7, 2003, reporting a roof fall in
the tailgate travelway that extended through the Affected Area outby the face. David C. Hales,
San Juan's underground safety coordinator, testified that MSHA had written a letter to San Juan
a week prior to the hearing, expressing concern that roof falls might destroy ventilation controls
located in the Affected Area. He noted that miners examining the area or working on the
ventilation controls would also be exposed to the hazard. Tr. 303.

Prompted, in part, by miners' complaints, San Juan submitted a request to MSHA for a
modification of the air quality standard, proposing that a diffusion zone be established in the
vicinity of the Affected Area. Concentrations of oxygen lower than those required in section
75-321(a)(1) would be allowed in the diffusion zone, and miners would not be permitted to work
or travel in it. MSHA has investigated the proposal, which had been submitted over a year
before the hearing, but no decision has yet been made. MSHA's concern with the proposal is
apparently the size of the diffusion zone proposed by San Juan. Notably, on the day that MSHA
conducted an on-site inspection in conjunction with the petition, a roof fall, extending three feet
into the Affected Area, occurred. Tr. 270.

The Validity of the Citation

The Notice of Contest filed by San Juan challenges the validity of Citation No. 7605607,
alleging that on November 10, 2003, the air in the Affected Area contained insufficient oxygen.
The parties agree that oxygen levels in the Affected Area were less than 19.5%. They disagree
on whether the Affected Area was an area where persons work or travel within the meaning of
the regulation.

The main argument advanced by the Secretary is that persons entered the Affected Area
on many occasions, both to travel through it and to perform work, mandating application of the
regulation. Had the area not been dangered off, I would be compelled to agree. While San Juan
argues that none of its miners were ever scheduled to work or travel in the area, it is clear that
many did so, both as a matter of convenience and to perform tasks mandated by MSHA's
directive that the standard applied. Absent the danger sign, miners would have been free to enter
the area and may well have done so. Consequently, application of the standard would be entirely
consistent with its plain wording, and logically necessary to protect persons from hazardous air,
whether or not anyone actually traveled or worked in the area, or was scheduled to, on
November 10.

However, on November 10, 2003, the date the citation was issued, San Juan had taken
effective steps to assure that no person worked or traveled in the Affected Area. Vetter testified
that when he arrived, he observed a danger sign that had been posted on the gob separation plate,
and he determined that it was an effective measure to bar persons from entering the area.
Tr. 128, 145-46. Despite a possible suggestion by the Secretary to the contrary, there is no
evidence that the Affected Area was not effectively dangered off, and that miners and others who
might have been in the vicinity had been put on notice that entry and travel through the Affected
Area was prohibited.12 Vetter had not observed anyone in the Affected Area prior to entering it
for the inspection, and the Secretary does not contend that any San Juan miners or other persons
were in the Affected Area on November 10, 2003, other than in conjunction with the inspection
and any remedial measures generated as a result of issuance of the citation. I find that, in the
absence of the Secretary's intervention, no person would have worked or traveled in the Affected
Area on November 10, 2003.

The Secretary counters that dangering off is "a temporary measure designed to prevent
access to a dangerous area until the hazard can be eliminated, which must be undertaken
immediately," and that dangering off "is prohibited in this case." 13 However, the regulation on
which she primarily relies, 30 C.F.R. � 75.363(a), does not prohibit dangering off an area of poor
air quality.14 Nor does it compel immediate corrective action under the circumstances presented
here. In fact, section 75.363(a) provides that when San Juan detected low oxygen levels in the
Affected Area, it was compelled to danger it off. Thereafter, the regulation dictates that the
"condition shall be corrected immediately or the area shall remain posted until the hazardous
condition is corrected (emphasis added)." Further immediate actions are required only if the
condition is found to constitute an imminent danger. The condition found on November 10 and,
apparently, on other occasions when low oxygen levels have been found, did not remotely
approach the seriousness of an imminent danger.15

The Secretary's witnesses, in essence, agreed that it was appropriate to danger off the
area. Vetter sanctioned it as a temporary corrective action, but not a permanent one. Tr. 124-25.
He also maintained that dangering off is not an appropriate corrective action for low air quality
because it can't be isolated from the rest of the environment, and because the Affected Area is
part of the return air course that must be inspected weekly. Tr. 124, 159-60. Gibson testified
that it would not only be acceptable to danger the area off, but that it would be required by the
regulation if a hazard were found. Tr. 90, 93-95, 100-01, 104-05.

The Secretary also argues that dangering off the Affected Area is impermissible because
the tailgate travelway is a return air course that must be inspected weekly, and that it must be
maintained as an escapeway.16 Barring travel through the Affected Area, however, would not
appear to interfere with either of those functions. The route established by San Juan from the
longwall face to the tailgate travelway does not pass through the Affected Area. The main flow
of air also follows that route.17 That route remained open to travel for escape and inspection
purposes on November 10. San Juan's witnesses testified that all longwall mines have
ventilation problems on the tailgate side, and that MSHA has not enforced the ventilation
standard at several other mines with comparable areas where persons did not work or travel.
Tr. 379-80, 417-21. The Secretary's witnesses maintained that such areas have been considered
part of the tailgate travelway. Tr. 43.

Underlying the Secretary's argument is the contention that, unlike at least some other
hazards, an area with sub-standard air quality cannot simply be dangered off because that action
does not physically isolate or contain the bad air. The contention cannot be disputed. However,
on the facts of this case, any low quality air in the Affected Area is effectively contained by the
characteristics of the air flow, itself. While low oxygen levels have been found on numerous
occasions, there is no evidence that they have migrated out of the Affected Area, or that sub-
standard air has ever been found in adjacent working areas. The quantity of air in the Affected
Area is about 2,000 cubic feet. In contrast, 65,000-100,000 cubic feet of air is being drawn
across the face and out the tailgate travelway every minute. As air in the Affected Area escapes
the localized air flow anomalies that can result in low oxygen levels, it is promptly diluted. The
same is true for any gob air that might seep between shields and the air under the last shield, inby
its legs, where the standard has been made inapplicable by a provision in San Juan's ventilation
plan. Tr. 235.

The Secretary notes that if section 75.321(a)(1) does not apply in the Affected Area, then
no atmospheric standards would apply and very low concentrations of oxygen and/or very high
concentrations of methane or other gasses could exist without violating any standard. She then
posits that a roof fall in, or adjacent to, the Affected Area, could force any sub-standard air onto
the working face and/or into the tailgate travelway, exposing persons in those areas, and if high
methane levels were present, ignition sources might be encountered, with potentially disastrous
results. The argument is unconvincing for several reasons.

There is no evidence that explosive concentrations of methane or excessively low
concentrations of oxygen have ever been found in the Affected Area, and there is no reason to
believe that concentrations in a dangered off Affected Area would be any different than the
relatively benign concentrations historically experienced. There is also no evidence that sub-
standard air has been found in areas adjacent to the Affected Area. Assuming that air temporarily
displaced by a roof fall might be forced out of the Affected Area, it is highly unlikely that it
would enter the working area of the face because of the relatively massive quantities of
ventilation air flowing across the face and out the tailgate travelway, which would quickly dilute
it and render it harmless.

All of the electrical and other equipment on the longwall face is maintained in
permissible condition. Two AMS meters are mounted adjacent to the Affected Area, one behind
the legs of the last shield and one in front of the legs of the second to last shield. Those meters
continuously monitor the concentration of methane and alert when concentrations reach one
percent. The alert is visible at the meter and on screens at the headgate controls, and in a control
room on the surface. An alert requires that operations be stopped, and that measures be taken to
address the presence of methane. If methane concentrations reach 1.5%, the longwall equipment
is automatically deenergized. A similar meter is mounted on the shearing machine and
deenergizes the equipment if the concentration of methane reaches 2%. Methane is explosive at
concentrations of 5-15%. Tr. 243-45. One potential ignition source identified by the Secretary
would occur if the shearer cut into the tailgate travelway and encountered roof bolts. However,
San Juan's ventilation plan requires that the shearer be stopped ten shields from the tailgate
entry, and that the air in the tailgate entry be checked for the presence of methane before cutting
out to the travelway.

There is no question that roof falls occur, both in and adjacent to the Affected Area.
As noted above, the supported roof of the tailgate travelway falls sporadically as the shields pass.
Fortunately, the falls generally occur inby the Affected Area. There is no evidence that roof falls,
even those that extended into the Affected Area, have ever resulted in sub-standard atmospheric
conditions in the working face or outside of the Affected Area. Assuming that a roof fall could
force air out of the Affected Area into working areas, there is no evidence that dangering off the
Affected Area would increase whatever risk already exists.

The Secretary attempts to draw a comparison with the application of safety standards to
mobile equipment, asserting that deenergizing or tagging out equipment is not sufficient to abate
a violation, citing Eastern Ass. Coal. Corp., 1 FMSHRC 1473 (Oct. 1979) (defective parking
brake violation not abated by danger tag, where equipment was capable of operation and was
located in work area - tag could have been ignored). However, the Commission has indicated
that tagging out a piece of mobile equipment may be sufficient to effectively take the equipment
out of service and avoid a violation. See Allen Lee Good, 23 FMSHRC 995 (Sept. 2001);
Mountain Parkway Stone, Inc., 12 FMSHRC 960 (May 1996); Ideal Basic Industries, Cement
Div., 3 FMSHRC 843 (April 1981).

Dangering off an area may be similar, in some respects, to tagging out a piece of mobile
equipment. However, danger signs are universally recognized as a means to identify and
emphasize the existence of a hazardous condition, and are effective measures to bar access to
unsafe areas, a concept recognized in the Secretary's regulations. For example, 30 C.F.R.
� 75.208 provides that posting a "readily visible warning" (typically referred to as "dangering
off") is sufficient to identify areas of a mine without permanent roof support. Here, Vetter
verified the effectiveness of the danger off sign, and testified that it would have been unlikely
that a miner would have entered the Affected Area on the date in question. Tr. 146-47. Of
course, a miner might ignore a danger sign and proceed into a prohibited area, conceivably even
beyond the imaginary line at the shield legs into the gob. That highly improbable possibility
cannot transform the Affected Area, or the gob, into an area where persons work or travel.

I agree with the parties that the wording of the regulation is plain on its face. It mandates
specified air quality in "areas where persons work or travel." I find that, on November 10, 2003,
the Affected Area was effectively dangered off, and was not an area where persons work or
travel, within the meaning of the regulation.18

Interpreting the plain meaning of the standard's language in this manner is consistent with
both the design of the regulations and the objective of the Act. The parties have devoted
considerable attention to the announced intent of the 1992 and 1996 amendments to regulations
governing air quality, each arguing that its position is harmonious with that intent and that the
other's is not. The most significant change occurred in 1992, when the Secretary re-formulated
regulations governing air quality to assure that areas where persons worked or traveled were
required to have an atmosphere with at least 19.5% oxygen, specifically extending that
requirement to bleeder entries, which several administrative law judges had found to be not
covered by the previous regulation. Requiring appropriate air quality wherever miners work or
travel, even if infrequently, would be consistent with the regulatory scheme. However, imposing
upon operators a requirement to maintain air quality in areas where no miner or other person
works or travels, would not be. As the Secretary recognized, in commenting on that part of the
current rule addressing air quality in bleeder entries, "The purpose of this standard is to protect
miners, not to regulate air quality where persons are not exposed." 61 Fed. Reg. 9764, 9776
(1996).

The overriding purpose of the Act is to protect the health and safety of miners.
E.g., Sec'y of Labor v. Cannelton Indus., Inc., 867 F.2d 1432, 1437 (D.C.Cir. 1989). Finding the
regulation inapplicable to the Affected Area on the date in question, when no miner or person
would have worked or traveled in it, is consistent with the protective purpose of the Act. Under
the Secretary's interpretation, which has been imposed by MSHA since the longwall began
operating, a preshift examination must be conducted to assess, inter alia, the air quality in the
Affected Area. If the air quality is found to satisfy the standard at the time of the examination,
miners are free to enter the Affected Area during the subsequent shift, and it is clear that many
have done so.19 However, the air quality in the Affected Area is highly variable. Gibson testified
that the air quality changes rapidly at times. The simple fact of a person stepping into the notch
in the gob separation plate can reduce oxygen levels at points in the Affected Area. Tr. 63, 67,
76, 97. David Hales gave similar testimony, stating that a monitor held stationary in the Affected
Area can go through a range of readings.20 Tr. 344. During the period November 6 to 10,
satisfactory oxygen levels were found during several preshift examinations. Tr. 111.

A finding of sufficient oxygen levels in the Affected Area during a preshift examination
provides virtually no assurance that they will remain in compliance for the next hour, much less
for an entire shift. Vetter testified that the fact that the air in the Affected Area was found to
comply with the requirements of section 75.321(a)(1) during a preshift examination did not mean
that miners were free to enter the area on the subsequent shift. "It may be okay at the conclusion
of the pre-shift or the examination, but it doesn't necessarily mean it's going to remain that way."
Tr. 140. While his position appears to be inconsistent with the preshift examination regulation, it
does confirm the variability of air quality in the area. Categorizing the Affected Area as active
workings, through which miners are free to pass once the preshift examination has been done,
would pose a substantially greater risk of exposing them to sub-standard atmospheric conditions
than if they were prevented from entering the area. The threat of roof falls in the Affected Area
poses an additional danger that would be avoided if entry into the Affected Area were barred.

Conclusion

I find that, on November 10, 2003, the Affected Area was not an "area where persons
work or travel," within the meaning of section 75.321(a)(1). San Juan was not prohibited from
dangering off the Affected Area. Having found a hazardous condition, it was compelled to do so.

ORDER

Citation No. 7605607 is hereby VACATED.

Michael E. Zielinski

Administrative Law Judge

Distribution (Certified Mail):

Timothy M. Biddle, Esq., Crowell & Moring, LLP., 1001 Pennsylvania Ave., N.W.,
Washington, D.C. 20004-2595

Timothy S. Williams, Esq., Office of the Solicitor, U.S. Department of Labor,
1100 Wilson Blvd., 22nd floor, Arlington, VA 22209

/mh

appendix: Exhibit C-4 (see footnote 5)

FOOTNOTES:

1 If the tailgate travelway becomes unavailable, an operator may resume mining, with the permission of MSHA, by implementing its tailgate blockage plan. See 30 C.F.R. �� 75.215.(b), 75.222(g), 75.384(c).

2 "Gob" is "[t]he space left by the extraction of a coal seam into which . . . the immediate roof caves." Am. Geological Institute, Dictionary of Mining, Mineral and Related Terms, 239 (2d ed. 1997).

3 30 C.F.R. � 75.325(c)(1) requires that a minimum quantity of 30,000 cubic feet of air per minute reach the working face of a longwall, unless a different amount is specified in the mine�s approved ventilation plan.

4 The borehole spacing exceeds the current 1,000 foot requirement in San Juan�s approved ventilation plan.

5 A replica of exhibit C-4 is attached as an Appendix to this Decision.

6 San Juan had many discussions with MSHA about the problem, and the enforcement policy followed by Vetter was consistent with that described by Donald A. Gibson, an MSHA field office supervisor. Tr. 62-63.

7 A number of other measures to address the problem have been considered. However, they, too, pose additional potential problems. For example, increasing the amount of air drawn out through the boreholes would reduce the likelihood of gob air infiltrating the Affected Area. However, it would also draw oxygen bearing air into the gob, increasing the risk of spontaneous combustion.

8 The parties agree that the exception contained in paragraph (a)(2), which deals with bleeder entries and worked out areas, is not applicable to this case.

9 The Secretary argues, in the alternative, that if the regulatory language is found to be ambiguous, that her interpretation is entitled to deference. San Juan counters that the Secretary�s interpretation is unreasonable and inconsistent with the legislative and regulatory scheme.

10 30 C.F.R. � 75.360(a)(1) requires, generally, that preshift examinations be conducted by certified persons before any shift in which "any person is scheduled to work or travel underground." It also provides that no person other than a certified examiner may remain in any underground area unless a preshift examination has been completed for the shift. 30 C.F.R. � 75.2 defines active workings as, "Any place in a coal mine where miners are normally required to work or travel."

11 The route to the tailgate travelway designated by San Juan passes somewhat closer to the corner of the face than the route through the Affected Area, and miners using it would be exposed to a marginally increased risk of a rib failure due to the pressures on that corner of the face.

12 The Secretary notes, in a footnote in her brief, that there was no physical barrier preventing entry to the Affected Area by persons approaching from the tailgate travelway. Sec. Br. at 23, n. 13. However, any such person would have entered the travelway by the route designated by San Juan and would have been aware that entry into the Affected Area had been prohibited. The danger sign would also have been visible from the tailgate travelway.

13 Sec. Reply Br. at 12.

14 ï¿½ 75.363 Hazardous conditions; posting, correcting and recording

(a) Any hazardous condition . . . shall be posted with a conspicuous danger sign where anyone entering the areas would pass. A hazardous condition shall be corrected immediately or the area shall remain posted until the hazardous condition is corrected. If the condition creates an imminent danger, everyone except those persons referred to in section 104(c) of the Act shall be withdrawn from the area affected to a safe area until the hazardous condition is corrected. Only persons designated by the operator to correct or evaluate the condition may enter the posted area.

15 Vetter determined that an injury was unlikely, and MSHA extended the time when abatement was required to November 16, 2003. MSHA�s enforcement policy, whereby citations for low oxygen levels were not issued if some corrective action was underway, also indicates the relative seriousness of the hazard.

16 See 30 C.F.R. �� 75.215(a), 75.364(b). To the extent that the Secretary suggests that dangering off the Affected Area may violate other standards, the merits of such a charge would have to be decided in a subsequent case.

17 Restrictions in air flow caused by the five-foot-high gob separation plate and other equipment contribute to the air quality problems in the Affected Area.

18 I reject the Secretary�s "bootstrap" contention that the violation was established by Vetter�s entry into the area and the subsequent entry of other persons to effectuate remedial measures dictated by the issuance of the citation. Certainly, MSHA inspectors and others are "persons" within the meaning of the regulation. However, I have found that, absent MSHA�s intervention no one would have entered the Affected Area on November 10, 2003. MSHA cannot be allowed to create a violation of a standard and saddle Respondent with the consequences, including the imposition of a civil penalty. I also reject the Secretary�s argument that the history of travel through the Affected Area renders the regulation applicable, even though it was effectively dangered off on November 10. That travel occurred under markedly different circumstances.

19 As noted above, the regulation addressing preshift examinations bars entry to areas that have not been successfully preshifted. See also the testimony of Gibson (Tr. 85) and David Hales (Tr. 298).

20 The bottle samples taken by Vetter on November 10 produced different results than those shown only moments earlier on his hand-held monitor. Tr. 113. Gibson has vacated a citation he had issued for sub-standard air quality in the Affected Area when the air taken in a bottle sample was found to be in compliance with the standard, a result markedly different from that that had been shown a little earlier on his hand-held meter. Tr. 63.