Impregilo Healy Parsons Joint Venture; Grant of a Permanent Variance

AGENCY:

Occupational Safety and Health Administration (OSHA), Labor.

ACTION:

Notice.

SUMMARY:

In this notice, OSHA grants a permanent variance to Impregilo Healy Parsons Joint Venture from the provisions of OSHA standards that regulate work in compressed-air environments at 29 CFR 1926.803.

DATES:

The permanent variance specified by this notice becomes effective on August 20, 2015, and shall remain in effect until the completion of the Anacostia River Tunnel Project, but no later than December 31, 2016.

FOR FURTHER INFORMATION CONTACT:

Information regarding this notice is available from the following sources:

Press inquiries: Contact Mr. Frank Meilinger, Director, OSHA Office of Communications, U.S. Department of Labor, 200 Constitution Avenue NW., Room N-3647, Washington, DC 20210; telephone: (202) 693-1999; email: Meilinger.francis2@dol.gov.

General and technical information: Contact Mr. Kevin Robinson, Director, Office of Technical Programs and Coordination Activities, Directorate of Technical Support and Emergency Management, Occupational Safety and Health Administration, U.S. Department of Labor, 200 Constitution Avenue NW., Room N-3655, Washington, DC 20210; phone: (202) 693-2110 or email: robinson.kevin@dol.gov.

SUPPLEMENTARY INFORMATION:

Copies of this Federal Register notice. Electronic copies of this Federal Register notice are available at http://www.regulations.gov. This Federal Register notice and other relevant information are also available at OSHA's Web page at http://www.osha.gov.

I. Notice of Application

On April 3, 2014, Impregilo Healy Parsons Joint Venture, (“IHP JV” or “the applicant”), 2600 Independence Avenue SE., Washington, DC 20003, submitted an application for a permanent variance and interim order under Section 6(d) of the Occupational Safety and Health Act of 1970 (“OSH Act”; 29 U.S.C. 655) and 29 CFR 1905.11 (“Variances and other relief under section 6(d)”) from several provisions of the OSHA standard that regulates work in compressed air at 29 CFR 1926.803. IHP JV also requested an interim order pending OSHA's decision on the application for a variance (Exhibit OSHA-2014-0011-0001, Request for Variance). Specifically, the applicant seeks a variance from the provisions of the standard that: (1) Prohibit compressed-air worker exposure to pressures exceeding 50 pounds per square inch (p.s.i.) except in an emergency (29 CFR 1926.803(e)(5)); (2) require the use of the decompression values specified in decompression tables in Appendix A of the compressed-air standard for construction (29 CFR 1926.803(f)(1)); and (3) require the use of automated operational controls and a special decompression chamber (29 CFR 1926.803(g)(1)(iii) and .803(g)(1)(xvii), respectively).

According to its application, IHP JV is currently the general contractor for the District of Columbia Water and Sewer Authority's (“DC Water”) project to construct the Anacostia River Tunnel. The Anacostia River Tunnel project design requires the ability to safely perform hyperbaric interventions in compressed air at pressures higher than allowed in the existing OSHA standard 29 CFR 1926.803(e)(5) which states: “No employee shall be subjected to pressure exceeding 50 p.s.i.g. except in emergency” (see footnote 1).

The applicant is a contractor that works on complex tunnel projects using recently developed equipment and procedures for soft-ground tunneling. The applicant's workers engage in the construction of subaqueous tunnels below the water table through soft soils consisting of clay, silt, and sand using advanced shielded mechanical excavation techniques in conjunction with an Earth Pressure Balanced Tunnel Boring Machine (EPBTBM).

IHP JV employs specially trained personnel for the construction of the tunnel, and states that this construction project uses shielded mechanical-excavation techniques. IHP JV asserts that its workers perform hyperbaric interventions at pressures greater than 50 p.s.i.g. in the excavation chamber of the EPBTBM. The hyperbaric interventions consist of conducting inspections and maintenance work on the cutter-head structure and cutting tools of the EPBTBM.

OSHA considered IHP JV's application for a permanent variance and interim order. On February 11, 2015, OSHA published a preliminary Federal Register notice announcing IHP JV's application for a permanent variance and interim order, grant of an interim order, and request for comments (80 FR 7636) for the Anacostia River Tunnel project.

II. The Variance Application

A. Background

IHP JV asserts that innovations in tunnel excavation, specifically with EPBTBMs, have, in most cases, eliminated the need to pressurize the entire tunnel. These advances in technology modified substantially the methods used by the construction industry to excavate subaqueous tunnels compared to the caisson work regulated by the current OSHA compressed-air standard for construction at 29 CFR 1926.803. Such advances reduce the number of workers exposed, and the total duration of exposure, to hyperbaric pressure during tunnel construction.

Using shielded mechanical-excavation techniques, in conjunction with precast concrete tunnel liners and backfill grout, EPBTBMs provide methods to achieve the face pressures required to maintain a stabilized tunnel face through various geologies, and isolate that pressure to the forward section (the working chamber) of the EPBTBM. Interventions in the working chamber take place only after halting tunnel excavation and preparing the machine and crew for an intervention. Interventions occur to inspect or maintain the mechanical-excavation components located in the working chamber. Maintenance conducted in the working chamber includes changing replaceable cutting tools and disposable wear bars, and, in rare cases, repairing structural damage to the cutter head.

In addition to innovations in tunnel-excavation methods, research conducted after OSHA published its compressed-air standard for construction in 1971, resulted in advances in hyperbaric medicine. In this regard, the applicant asserts that the use of decompression protocols incorporating oxygen is more efficient, effective, and safer for tunnel workers than compliance with the existing OSHA standard (29 CFR 1926, subpart S, Appendix A decompression tables). According to the applicant, contractors routinely and safely expose employees performing interventions in the working chamber of EPBTBMs to hyperbaric pressures up to 75 p.s.i.g., which is 50% higher than maximum pressure specified by the existing OSHA standard (see 29 CFR 1926.803(e)(5)). The applicant asserts that these hyperbaric exposures are possible because of advances in hyperbaric technology, a better understanding of hyperbaric medicine, and the development of a project-specific HOM (Hyperbaric Operations Manual) that requires specialized medical support and hyperbaric supervision to provide assistance to a team of specially trained man-lock attendants and hyperbaric workers.

The applicant contends that the alternative safety measures included in its application provide its workers with a place of employment that is at least as safe and healthful as they would obtain under the existing provisions of OSHA's compressed-air standard for construction. The applicant certifies that it provided employee representatives of affected workers with a copy of the variance application. The applicant also certifies that it notified its workers of the variance application by posting, at prominent locations where it normally posts workplace notices, a summary of the application and information specifying where the workers can examine a copy of the application. In addition, the applicant informed its workers and their representatives of their rights to petition the Assistant Secretary of Labor for Occupational Safety and Health for a hearing on the variance application.

B. Variance From Paragraph (e)(5) of 29 CFR 1926.803, Prohibition of Exposure to Pressure Greater Than 50 p.s.i.g. (See Footnote 1)

The applicant states that it may perform hyperbaric interventions at pressures greater than 50 p.s.i.g. in the working chamber of the EPBTBM; this pressure exceeds the pressure limit of 50 p.s.i.g. specified for nonemergency purposes by 29 CFR 1926.803(e)(5). The EPBTBM has twin man locks, with each man lock having two compartments. This configuration allows workers to access the man locks for compression and decompression, and medical personnel to access the man locks if required in an emergency.

EPBTBMs are capable of maintaining pressure at the tunnel face, and stabilizing existing geological conditions, through the controlled use of propel cylinders, a mechanically driven cutter head, bulkheads within the shield, ground-treatment foam, and a screw conveyor that moves excavated material from the working chamber. As noted earlier, the forward-most portion of the EPBTBM is the working chamber, and this chamber is the only pressurized segment of the EPBTBM. Within the shield, the working chamber consists of two sections: The staging chamber and the forward working chamber. The staging chamber is the section of the working chamber between the man-lock door and the entry door to the forward working chamber. The forward working chamber is immediately behind the cutter head and tunnel face.

The applicant will pressurize the working chamber to the level required to maintain a stable tunnel face. Pressure in the staging chamber ranges from atmospheric (no increased pressure), to a maximum pressure equal to the pressure in the working chamber. The applicant asserts that most of the hyperbaric interventions will be at or near atmospheric pressure. However, the applicant maintains that they may have to perform interventions at pressures up to 52 p.s.i.g.

During interventions, workers enter the working chamber through one of the twin man locks that open into the staging chamber. To reach the forward part of the working chamber, workers pass through a door in a bulkhead that separates the staging chamber from the forward working chamber. The maximum crew size allowed in the forward working chamber is three. At certain hyperbaric pressures (i.e., when decompression times are greater than work times), the twin man locks allow for crew rotation. During crew rotation, one crew can be compressing or decompressing while the second crew is working. Therefore, the working crew always has an unoccupied man lock at its disposal.

The applicant developed a project-specific HOM for the Anacostia River Tunnel project (Exhibit OSHA-2014-0011-0003, IHP JV Project-Specific HOM) that describes in detail the hyperbaric procedures and required medical examinations used during the tunnel-construction project. The HOM is project-specific, and discusses standard operating procedures and emergency and contingency procedures. The procedures include using experienced and knowledgeable man-lock attendants who have the training and experience necessary to recognize and treat decompression illnesses and injuries. The attendants are under the direct supervision of the hyperbaric supervisor and attending physician. In addition, procedures include medical screening and review of prospective compressed-air workers (CAWs). The purpose of this screening procedure is to vet prospective CAWs with medical conditions (e.g., deep vein thrombosis, poor vascular circulation, and muscle cramping) that could be aggravated by sitting in a cramped space (e.g., a man lock) for extended periods or by exposure to elevated pressures and compressed gas mixtures. A transportable recompression chamber (shuttle) is available to extract workers from the hyperbaric working chamber for emergency evacuation and medical treatment; the shuttle attaches to the topside medical lock, which is a large recompression chamber. The applicant believes that the procedures included in the HOM provide safe work conditions when interventions are necessary, including interventions above 50 p.s.i.g.

C. Variance From Paragraph (f)(1) of 29 CFR 1926.803, Requirement To Use OSHA Decompression Tables

OSHA's compressed-air standard for construction requires decompression in accordance with the decompression tables in Appendix A of 29 CFR part 1926, subpart S (see 29 CFR 1926.803(f)(1)). As an alternative to the OSHA decompression tables, the applicant proposes to use newer decompression schedules that supplement breathing air used during decompression with pure oxygen. The applicant asserts that these decompression protocols are safer for tunnel workers than the decompression protocols specified in Appendix A of 29 CFR part 1926, subpart S. Accordingly, the applicant proposes to use the 1992 French Decompression Tables to decompress CAWs after they exit the hyperbaric conditions in the working chamber.

Depending on the maximum working pressure and exposure time s, the 1992 French Decompression Tables provide for air decompression with or without oxygen. IHP JV asserts that oxygen decompression has many benefits, including (1) keeping the partial pressure of nitrogen in the lungs as low as possible; (2) keeping external pressure as low as possible to reduce the formation of bubbles in the blood; (3) removing nitrogen from the lungs and arterial blood and increasing the rate of elimination of nitrogen; (4) improving the quality of breathing during decompression stops so that workers are less tired and to prevent bone necrosis; (5) reducing decompression time by about 33 percent as compared to air decompression; and (6) reducing inflammation.

In addition, the HOM requires a physician certified in hyperbaric medicine to manage the medical condition of CAWs during hyperbaric exposures and decompression. A trained and experienced man-lock attendant also will be present during hyperbaric exposures and decompression. This man-lock attendant will operate the hyperbaric system to ensure compliance with the specified decompression table. A hyperbaric supervisor (competent person), trained in hyperbaric operations, procedures, and safety, will directly oversee all hyperbaric interventions, and ensure that staff follow the procedures delineated in the HOM or by the attending physician.

The applicant asserts that at higher hyperbaric pressures, decompression times exceed 75 minutes. The HOM establishes protocols and procedures that provide the basis for alternate means of protection for CAWs under these conditions. Accordingly, based on these protocols and procedures, the applicant requests to use the 1992 French Decompression Tables for hyperbaric interventions up to 52 p.s.i.g. for the Anacostia River Tunnel project. The applicant is committed to follow the decompression procedures described in the project-specific HOM during these interventions.

D. Variance From Paragraph (g)(1)(iii) of 29 CFR 1926.803, Automatically Regulated Continuous Decompression

According to the applicant, breathing air under hyperbaric conditions increases the amount of nitrogen gas dissolved in a CAW's tissues. The greater the hyperbaric pressure under these conditions, and the more time spent under the increased pressure, the greater the amount of nitrogen gas dissolved in the tissues. When the pressure decreases during decompression, tissues release the dissolved nitrogen gas into the blood system, which then carries the nitrogen gas to the lungs for elimination through exhalation. Releasing hyperbaric pressure too rapidly during decompression can increase the size of the bubbles formed by nitrogen gas in the blood system, resulting in DCI, commonly referred to as “the bends.” This description of the etiology of DCI is consistent with current scientific theory and research on the issue (see footnote 12 in this notice discussing a 1985 NIOSH report on DCI).

The 1992 French Decompression Tables proposed for use by the applicant provide for stops during worker decompression (i.e., staged decompression) to control the release of nitrogen gas from tissues into the blood system. Studies show that staged decompression, in combination with other features of the 1992 French Decompression Tables such as the use of oxygen, result in a lower incidence of DCI than the OSHA decompression requirements of 29 CFR 1926.803, which specify the use of automatically regulated continuous decompression (see footnotes 10 through 14 in this notice for references to these studies). In addition, the applicant asserts that staged decompression is at least as effective as an automatic controller in regulating the decompression process because:

1. A hyperbaric supervisor (a competent person experienced and trained in hyperbaric operations, procedures, and safety) directly supervises all hyperbaric interventions and ensures that the man-lock attendant, who is a competent person in the manual control of hyperbaric systems, follows the schedule specified in the decompression tables, including stops; and

2. The use of the 1992 French Decompression Tables for staged decompression offers an equal or better level of management and control over the decompression process than an automatic controller and results in lower occurrences of DCI.

Accordingly, the applicant is applying for a permanent variance from the OSHA standard at 29 CFR 1926.803(g)(1)(iii), which requires automatic controls to regulate decompression. As noted above, the applicant is committed to conduct the staged decompression according to the 1992 French Decompression Tables under the direct control of the trained man-lock attendant and under the oversight of the hyperbaric supervisor.

E. Variance From Paragraph (g)(1)(xvii) of 29 CFR 1926.803, Requirement of Special Decompression Chamber

The OSHA compressed-air standard for construction requires employers to use a special decompression chamber when total decompression time exceeds 75 minutes (see 29 CFR 1926.803(g)(1)(xvii)). Use of the special decompression chamber enables CAWs to move about and flex their joints to prevent neuromuscular problems during decompression.

As an alternative to using a special decompression chamber, the applicant notes that since only the working chamber of the EPBTBM is under pressure, and only a few workers out of the entire crew are exposed to hyperbaric pressure, the man locks (which, as noted earlier, connect directly to the working chamber) and the staging chamber are of sufficient size to accommodate the exposed workers. In addition, available space in the EPBTBM does not allow for an additional special decompression lock. Again, the applicant uses the man locks, each of which adequately accommodates a three-member crew, for this purpose when decompression lasts up to 75 minutes. When decompression exceeds 75 minutes, crews can open the door connecting the two compartments in each man lock during decompression stops or exit the man lock and move into the staging chamber where additional space is available. This alternative enables CAWs to move about and flex their joints to prevent neuromuscular problems during decompression.

F. Previous Tunnel Construction Variances

OSHA notes that on May 23, 2014, it granted a sub-aqueous tunnel construction permanent variance to Tully/OHL USA Joint Venture (79 FR 29809) from the same provisions of the standard that regulate work in compressed air (at 29 CFR 1926.803(e)(5), (f)(1), (g)(1)(iii), and (g)(1)(xvii)) that are the subject of the present application. On March 27, 2015, OSHA also granted another sub-aqueous tunnel construction permanent variance to Traylor/Skanska/Jay Dee Joint Venture (80 FR 16440) from the same provisions of the standard that are the subject of the present application. Generally, the alternate conditions in this notice are based on and very similar to the alternate conditions of the previous permanent variances.

G. Multi-State Variance

As stated earlier in this notice, IHP JV applied for a permanent variance and interim order for its Anacostia River Tunnel project only. The Anacostia River Tunnel project is located entirely in the District of Columbia and thus under Federal OSHA's exclusive jurisdiction. Therefore, any variance OSHA grants IHP JV will have effect only in the District of Columbia.

Twenty-eight state safety and health plans have been approved by OSHA under section 18 of the (OSH) Act. As part of the permanent variance process, the Directorate of Cooperative and State Programs will notify the State Plans of IHP JV's variance application and grant of the Anacostia River Tunnel project permanent variance.

Additionally, in considering IHP JV's application for a permanent variance and interim order, OSHA noted that four State Plans have previously granted sub-aqueous tunnel construction variances and imposed different or additional requirements and conditions (California, Nevada, Oregon, and Washington). California also promulgated new standards for similar sub-aqueous tunnel construction work.

III. Description of the Conditions Specified for the Permanent Variance

This section describes the alternative means of compliance with 29 CFR 1926.803(e)(5), (f)(1), (g)(1)(iii), and (g)(1)(xvii) and provides additional detail regarding the conditions that form the basis of IHP JV's permanent variance.

Condition A: Scope

The scope of the permanent variance limits coverage to the work situations specified under this condition. Clearly defining the scope of the permanent variance provides IHP JV, IHP JV's employees, other stakeholders, the public, and OSHA with necessary information regarding the work situations in which the permanent variance applies.

According to 29 CFR 1905.11, an employer (or class or group of employers ) may request a permanent variance for a specific workplace or workplaces (multiple sites). If granted, the variance applies to the specific employer(s) that submitted the application. In this instance, the permanent variance applies to the applicant, IHP JV, for its Anacostia River Tunnel project, and does not apply to any other employers.

Condition B: Application

This condition specifies the circumstances under which the permanent variance is in effect, notably only for hyperbaric work performed during interventions. The condition places clear limits on the circumstances under which the applicant can expose its employees to hyperbaric pressure.

Condition C: List of Abbreviations

This condition defines a number of abbreviations used in the permanent variance. OSHA believes that defining these abbreviations serves to clarify and standardize their usage, thereby enhancing the applicant's and its employees' understanding of the conditions specified by the permanent variance.

Condition D: Definitions

The condition defines a series of terms, mostly technical terms, used in the permanent variance to standardize and clarify their meaning. Defining these terms serves to enhance the applicant's and its employees' understanding of the conditions specified by the permanent variance.

Condition E: Safety and Health Practices

This condition requires the applicant to develop and submit to OSHA an HOM specific to the Anacostia River Tunnel project at least six months before using the EPBTBM for tunneling operations. Additionally, the condition includes a series of related hazard prevention and control requirements and methods (e.g., decompression tables, job hazard analysis (JHA), operations and inspections checklists, incident investigation, recording and notification to OSHA of recordable hyperbaric injuries and illnesses, etc.) designed to ensure the continued effective functioning of the hyperbaric equipment and operating system.

Review of the HOM enables OSHA to: (1) Determine that the safety and health instructions and measures it specifies are appropriate and do adequately protect the safety and health of the CAWs and that it conforms to the conditions of the variance; and (2) request the applicant to revise or modify the HOM if it finds that the hyperbaric safety and health procedures are not suitable for the specific project and do not adequately protect the safety and health of the CAWs. Once approved, the project-specific HOM becomes part of the variance, thus enabling OSHA to enforce its safety and health procedures and measures.

Condition F: Communication

This condition requires the applicant to develop and implement an effective system of information sharing and communication. Effective information sharing and communication ensures that affected workers receive updated information regarding any safety-related hazards and incidents, and corrective actions taken, prior to the start of each shift. The condition also requires the applicant to ensure that reliable means of emergency communications are available and maintained for affected workers and support personnel during hyperbaric operations. Availability of such reliable means of communication enable affected workers and support personnel to respond quickly and effectively to hazardous conditions or emergencies that may develop during EPBTBM operations.

Condition G: Worker Qualification and Training

This condition requires the applicant to develop and implement an effective qualification and training program for affected workers. The condition specifies the factors that an affected worker must know to perform safely during hyperbaric operations, including how to enter, work in, and exit from hyperbaric conditions under both normal and emergency conditions. Having well-trained and qualified workers performing hyperbaric intervention work ensures that they recognize, and respond appropriately to, hyperbaric safety and health hazards. These qualification and training requirements enable affected workers to cope effectively with emergencies, as well as the discomfort and physiological effects of hyperbaric exposure, thereby preventing injury, illness, and fatalities among workers.

As part of the qualification and training program, paragraph (G)(2)(e) of this condition also requires the applicant to provide affected workers with information they can use to contact the appropriate healthcare professionals if they believe that they are developing hyperbaric-related health effects. This requirement provides for early intervention and treatment of DCI and other health effects resulting from hyperbaric exposure, thereby reducing the potential severity of these effects.

Condition H: Inspections, Tests, and Accident Prevention

This condition requires the applicant to develop, implement, and operate a program of frequent and regular inspections of the EPBTBM's hyperbaric equipment and support systems, and associated work areas. This condition helps to ensure the safe operation and physical integrity of the equipment and work areas necessary to conduct hyperbaric operations. The condition also enhances worker safety by reducing the risk of hyperbaric-related emergencies.

Paragraph (H)(3) of this condition requires the applicant to document tests, inspections, corrective actions, and repairs involving the EPBTBM, and maintain these documents at the job site for the duration of the job. This requirement provides the applicant with information needed to schedule tests and inspections to ensure the continued safe operation of the equipment and systems, and to determine that the actions taken to correct defects in hyperbaric equipment and systems were appropriate, prior to returning them to service.

Condition I: Compression and Decompression

This condition requires the applicant to consult with its designated medical advisor regarding special compression or decompression procedures appropriate for any unacclimated CAW. This provision ensures that the applicant consults with the medical advisor, and involves the medical advisor in the evaluation, development, and implementation of compression or decompression protocols appropriate for any CAW requiring acclimation to the hyperbaric conditions encountered during EPBTBM operations. Accordingly, CAWs requiring acclimation have an opportunity to acclimate prior to exposure to these hyperbaric conditions. OSHA believes this condition will prevent or reduce adverse reactions among CAWs to the effects of compression or decompression associated with the intervention work they perform in the EPBTBM.

Condition J: Recordkeeping

This condition requires the applicant to maintain records of specific factors associated with each hyperbaric intervention. The information gathered and recorded under this provision, in concert with the information provided under Condition K (using OSHA 301 Incident Report form to investigate and record hyperbaric recordable injuries as defined by 29 CFR 1904.4, 1904.7, 1904.8 through 1904.12), enables the applicant and OSHA to determine the effectiveness of the permanent variance in preventing decompression illness (DCI) and other hyperbaric-related effects.

Condition K: Notifications

Under this condition, the applicant must, within specified periods: (1) Notify OSHA of any recordable injuries, illnesses, in-patient hospitalizations, amputations, loss of an eye, or fatality that occur as a result of hyperbaric exposures during EPBTBM operations; (2) provide OSHA with a copy of the incident investigation report (using OSHA 301 form) of these events; (3) include on the 301 form information on the hyperbaric conditions associated with the recordable injury or illness, the root-cause determination, and preventive and corrective actions identified and implemented by the applicant; and (4) its certification that it informed affected workers of the incident and the results of the incident investigation.

This condition also requires the applicant to: Notify the Office of Technical Programs and Coordination Activities (OTPCA) and the Baltimore/Washington DC Area Office within 15 working days should the applicant need to revise its HOM to accommodate changes in its compressed-air operations that affect its ability to comply with the conditions of the permanent variance; and provide OSHA's OTPCA and the Baltimore/Washington DC Area Office, at the end of the project, with a report evaluating the effectiveness of the decompression tables.

These notification requirements enable the applicant, its employees, and OSHA to determine the effectiveness of the permanent variance in providing the requisite level of safety to the applicant's workers and, based on this determination, whether to revise or revoke the conditions of the permanent variance. Timely notification permits OSHA to take whatever action may be necessary and appropriate to prevent further injuries and illnesses. Providing notification to employees informs them of the precautions taken by the applicant to prevent similar incidents in the future.

This condition also requires the applicant to notify OSHA if it ceases to do business, has a new address or location for its main office, or transfers the operations covered by the permanent variance to a successor company. In addition, the condition specifies that OSHA must approve the transfer of the permanent variance to a successor company. These requirements allow OSHA to communicate effectively with the applicant regarding the status of the permanent variance, and expedite the Agency's administration and enforcement of the permanent variance. Stipulating that an applicant must have OSHA's approval to transfer a variance to a successor company provides assurance that the successor company has knowledge of, and will comply with, the conditions specified by the permanent variance, thereby ensuring the safety of workers involved in performing the operations covered by the permanent variance.

IV. Comments on the Proposed Variance Application

OSHA received one public comment on the proposed variance application. Mr. Barry Cole (safety specialist) representing Cole-Preferred Safety Consulting, Inc., supported granting the permanent variance (Exhibit OSHA-2014-0011-0008). In his comment, Mr. Cole made two suggestions. First, he proposed that OSHA should allow the applicant substantially more room to work beyond the anticipated hyperbaric pressure of 52 p.s.i.g., by changing the upper hyperbaric pressure limit of the variance from 52 p.s.i.g. to “the level necessary to maintain safety on the face, and/up to the design/rating limits of the machinery described.” Second, he recommended that OSHA should issue a letter of interpretation (LOI) that allows all tunnel construction companies working under hyperbaric conditions “to be allowed to use the stepped method of depressurization, as per engineering/medical data and schedules (such as but not limited to the French scale), as it is the best/safest practice, and the original standard should have included it, even if the preference was for some reason to use auto/straight line [decompression]. Either may be allowed, under my proposed letter of interpretation.”

The remainder of this section describes OSHA's response to Mr. Cole's comments.

First, OSHA finds that the recommendation to increase the upper hyperbaric pressure limit of the variance from 52 p.s.i.g. to the level necessary to maintain safety at the face of the EPBTBM (up to 75 p.s.i.g.), is well beyond the scope of the requested variance. Therefore, OSHA will not modify the permanent variance.

Initially, IHP JV sought a permanent variance for work in hyperbaric environments up to 50 p.s.i.g., as indicated in its Anacostia River Tunnel project-specific HOM. The HOM stated that in the unlikely event that working pressures exceeding the anticipated maximum of 50 p.s.i.g. are required during interventions, an amendment will be prepared and added to the HOM. Following discussions with the applicant, and in response to the applicant's request, OSHA is granting an increase in the upper hyperbaric pressure limit of the variance from 50 p.s.i.g. to 52 p.s.i.g. This increase will: (1) Provide greater flexibility and timeliness for responding to unanticipated conditions such as the need for increased face pressure (exceeding 50 p.s.i.g.) in the excavation chamber of the EPBTBM during interventions; and (2) maintain consistency with the upper hyperbaric pressure limit of 52 p.s.i.g. included in the variance OSHA granted to Traylor Skanska Jay Dee Joint Venture (80 FR 16440) for completing the Blue Plains Tunnel, another phase of the District of Columbia Water and Sewer Authority's (“DC Water”) Clean Rivers project. Subsequently, IHP JV submitted a revised Anacostia River Tunnel project-specific HOM (Rev. 1; see Ex. OSHA-2014-0011-0009) for work in hyperbaric environments up to 52 p.s.i.g.

Second, OSHA finds that the recommendation to publish a LOI on stepped decompression using the French or other tables is well beyond the scope of this variance. Therefore, OSHA will not undertake issuing an LOI that allows tunnel construction companies working under hyperbaric conditions to operate under the conditions of previously granted variances. Moreover, the grant of this variance is conditioned on OSHA's approval of the applicant's HOM, and such a procedure would not be possible under a LOI.

Further, broader, industry-wide issues such as the setting of hyperbaric exposure and decompression limits for all tunneling work would be more appropriately resolved through the rulemaking process. In recognition of this, on December 6, 2012, OSHA published a Federal Register notice (77 FR 72781) announcing a request for information (RFI) for its continuing regulatory reviews named standards improvement projects (SIPs). The Agency is currently working on SIP-Phase IV (SIP-IV). As part of SIP-IV, OSHA is considering updating the decompression tables in Appendix A (1926.803 (f)(1)). This proposed action would permit employers to use decompression procedures and updated decompression tables that take advantage of new hyperbaric technologies used widely in extreme hyperbaric exposures. If the planned SIP-IV revises Appendix A, IHP JV (and similar tunneling contractors previously granted a variance) will no longer need to obtain a variance from the use of decompression values specified in decompression tables in Appendix A of the compressed-air standard for construction (29 CFR 1926.803(f)(1)). However, they would still require hyperbaric tunneling variances to address portions of the standard not proposed to be covered by SIP-IV (i.e., 29 CFR 1926.803(e)(5); .803(g)(1)(iii) and .803(g)(1)(xvii)).

If SIP-IV is completed (including the planned update of the decompression tables in Appendix A (1926.803 (f)(1)), OSHA will modify IHP JV's and similar variances granted to other employers to include the applicable SIP-IV provisions as appropriate.

V. Decision

As noted earlier, on February 11, 2015, OSHA published a preliminary Federal Register notice announcing IHP JV's application for a permanent variance and interim order, grant of an interim order, and request for comments (80 FR 7636).

During the period starting with the February 11, 2015, publication of the preliminary Federal Register notice announcing grant of the interim order, until completion of the Anacostia River Tunnel or the Agency modifies or revokes the interim order or makes a decision on its application for a permanent variance, the applicant was required to comply fully with the conditions of the interim order as an alternative to complying with the requirements of 29 CFR 1926.803 (hereafter, “the standard”) that:

A. Prohibit employers using compressed air under hyperbaric conditions from subjecting workers to pressure exceeding 50 p.s.i.g., except in emergency (29 CFR 1926.803(e)(5));

B. Require the use of decompression values specified by the decompression tables in Appendix A of the compressed-air standard (29 CFR 1926.803(f)(1)); and

C. Require the use of automated operational controls and a special decompression chamber (29 CFR 1926.803(g)(1)(iii) and .803(g)(1)(xvii), respectively).

After reviewing the proposed alternative measures, OSHA determined that:

A. IHP JV developed, and proposed to implement, effective alternative measures to the prohibition of using compressed air under hyperbaric conditions exceeding 50 p.s.i.g. The alternative measures include use of engineering and administrative controls of the hazards associated with work performed in compressed-air conditions exceeding 50 p.s.i.g. while engaged in the construction of a subaqueous tunnel using advanced shielded mechanical-excavation techniques in conjunction with an EPBTBM. Prior to conducting interventions in the EPBTBM's pressurized working chamber, the applicant halts tunnel excavation and prepares the machine and crew to conduct the interventions. Interventions involve inspection, maintenance, or repair of the mechanical-excavation components located in the working chamber.

B. IHP JV developed, and proposed to implement, safe hyperbaric work procedures, emergency and contingency procedures, and medical examinations for the project's CAWs. The applicant compiled these standard operating procedures into a project-specific HOM. The HOM discusses the procedures and personnel qualifications for performing work safely during the compression and decompression phases of interventions. The HOM also specifies the decompression tables the applicant proposes to use. Depending on the maximum working pressure and exposure times during the interventions, the tables provide for decompression using air, pure oxygen, or a combination of air and oxygen. The decompression tables also include delays or stops for various time intervals at different pressure levels during the transition to atmospheric pressure (i.e., staged decompression). In all cases, a physician certified in hyperbaric medicine will manage the medical condition of CAWs during decompression. In addition, a trained and experienced man-lock attendant, experienced in recognizing decompression sickness or illnesses and injuries, will be present. Of key importance, a hyperbaric supervisor (competent person), trained in hyperbaric operations, procedures, and safety, will directly supervise all hyperbaric operations to ensure compliance with the procedures delineated in the project-specific HOM or by the attending physician.

C. IHP JV developed, and proposed to implement, a training program to instruct affected workers in the hazards associated with conducting hyperbaric operations.

D. IHP JV developed, and proposed to implement, an effective alternative to the use of automatic controllers that continuously decrease pressure to achieve decompression in accordance with the tables specified by the standard. The alternative includes using the 1992 French Decompression Tables for guiding staged decompression to achieve lower occurrences of DCI, using a trained and competent attendant for implementing appropriate hyperbaric entry and exit procedures, and providing a competent hyperbaric supervisor, and attending physician certified in hyperbaric medicine, to oversee all hyperbaric operations.

E. IHP JV developed, and proposed to implement, an effective alternative to the use of the special decompression chamber required by the standard. EPBTBM technology permits the tunnel's work areas to be at atmospheric pressure, with only the face of the EPBTBM (i.e., the working chamber) at elevated pressure. The applicant limits interventions conducted in the working chamber to performing required inspection, maintenance, and repair of the cutting tools on the face of the EPBTBM. The EPBTBM's man lock and working chamber provide sufficient space for the maximum crew of three CAWs to stand up and move around, and safely accommodate decompression times up to 360 minutes. Therefore, OSHA preliminarily determined that the EPBTBM's man lock and working chamber function as effectively as the special decompression chamber required by the standard.

OSHA conducted a review of the scientific literature regarding decompression to determine whether the alternative decompression method (i.e., the 1992 French Decompression Tables) proposed by the applicant provide a workplace as safe and healthful as that provided by the standard. Based on this review, OSHA preliminarily determined that decompressions conducted in tunneling operations performed with tables result in a lower occurrence of DCI than the decompression tables specified by the standard.

The review conducted by OSHA found several research studies supporting the determination that the 1992 French Decompression Tables result in a lower rate of DCI than the decompression tables specified by the standard. For example, H. L. Anderson studied the occurrence of DCI at maximum hyperbaric pressures ranging from 4 p.s.i.g. to 43 p.s.i.g. during construction of the Great Belt Tunnel in Denmark (1992-1996); this project used the 1992 French Decompression Tables to decompress the workers during part of the construction. Anderson observed 6 DCI cases out of 7,220 decompression events, and reported that switching to the 1992 French Decompression tables reduced the DCI incidence to 0.08%. The DCI incidence in the study by H.L. Andersen is substantially less than the DCI incidence reported for the decompression tables specified in Appendix A. OSHA found no studies in which the DCI incidence reported for the 1992 French Decompression Tables were higher than the DCI incidence reported for the OSHA decompression tables, nor did OSHA find any studies indicating that the 1992 French Decompression Tables were more hazardous to employees than the OSHA decompression tables. Therefore, OSHA concludes that use of the 1992 French Decompression Tables protect workers at least as effectively as the OSHA decompression tables.

Based on a review of available evidence, the experience of State Plans that either granted variances (Nevada, Oregon, and Washington) or promulgated a new standard (California) for hyperbaric exposures occurring during similar subaqueous tunnel-construction work, and the information provided in the applicant's variance application, OSHA is granting the permanent variance.

Under Section 6(d) of the Occupational Safety and Health Act of 1970 (29 U.S.C. 655(d)), and based on the record discussed above, the Agency finds that when the employer complies with the conditions of the following order, the working conditions of the employer's workers are at least as safe and healthful as if the employer complied with the working conditions specified by paragraphs (e)(5), (f)(1), (g)(1)(iii), and (g)(1)(xvii) of 29 CFR 1926.803. Under the terms of this variance, IHP JV must: (1) Comply with the conditions listed below under “Specific Conditions of the Permanent Variance” for the period between the date of this notice and completion of the Anacostia River Tunnel project, but no later than December 31, 2016; (2) comply fully with all other applicable provisions of 29 CFR part 1926; and (3) provide a copy of this Federal Register notice to all employees affected by the conditions, including the affected employees of other employers, using the same means it used to inform these employees of its application for a permanent variance. This order will remain in effect until one of the following conditions occurs: (1) Completion of the IHP JV Anacostia River Tunnel project but no later than December 31, 2016; or (2) OSHA modifies or revokes this final order in accordance with 29 CFR 1905.13.

VI. Order

As of the effective date of this final order, OSHA is revoking the interim order granted to the employer on February 11, 2015 (80 FR 7636).

OSHA issues this final order authorizing Impregilo Healy Parsons Joint Venture, (“IHP JV” or “the applicant”), to comply with the following conditions instead of complying with the requirements of paragraphs 29 CFR 1926.803(e)(5), (f)(1), (g)(1)(iii), and (g)(1)(xvii). This final order applies to Impregilo Healy Parsons Joint Venture at the Anacostia River Tunnel project in Washington, DC. These conditions are:

A. Scope

The permanent variance applies only to work:

1. That occurs in conjunction with construction of the Anacostia River Tunnel project, a subaqueous tunnel constructed using advanced shielded mechanical-excavation techniques and involving operation of an EPBTBM;

2. Performed under compressed-air and hyperbaric conditions up to 52 p.s.i.g. at the Anacostia River Tunnel project;

3. In the EPBTBM's forward section (the working chamber) and associated hyperbaric chambers used to pressurize and decompress employees entering and exiting the working chamber;

4. Except for the requirements specified by 29 CFR 1926.803(e)(5), (f)(1), (g)(1)(iii), and (g)(1)(xvii), IHP JV must comply fully with all other applicable provisions of 29 CFR part 1926; and

5. This order will remain in effect until one of the following conditions occurs: (1) Completion of the Anacostia River Tunnel project, but no later than December 31, 2016; or (2) OSHA modifies or revokes this final order in accordance with 29 CFR 1905.13.

B. Application

The permanent variance applies only when IHP JV stops the tunnel-boring work, pressurizes the working chamber, and the CAWs either enter the working chamber to perform interventions (i.e., inspect, maintain, or repair the mechanical-excavation components), or exit the working chamber after performing interventions.

C. List of Abbreviations

Abbreviations used throughout this permanent variance include the following:

1. CAW—Compressed-air worker

2. CFR—Code of Federal Regulations

3. DCI—Decompression Illness

4. EPBTBM—Earth Pressure Balanced Tunnel Boring Machine

5. HOM—Hyperbaric Operations and Safety Manual

6. JHA—Job hazard analysis

7. OSHA—Occupational Safety and Health Administration

8. OTPCA—Office of Technical Programs and Coordination Activities

D. Definitions

The following definitions apply to this permanent variance. These definitions supplement the definitions in IHP JV's project-specific HOM.

1. Affected employee or worker—an employee or worker who is affected by the conditions of this permanent variance, or any one of his or her authorized representatives. The term “employee” has the meaning defined and used under the Occupational Safety and Health Act of 1970 (29 U.S.C. 651 et seq.)

2. Atmospheric pressure—the pressure of air at sea-level, generally, 14.7 p.s.i.a., 1 atmosphere absolute, or 0 p.s.i.g.

3. Compressed-air worker—an individual who is specially trained and medically qualified to perform work in a pressurized environment while breathing air at pressures up to 52 p.s.i.g.

4. Competent person—an individual who is capable of identifying existing and predictable hazards in the surroundings or working conditions that are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them.

5. Decompression illness—an illness (also called decompression sickness (DCS) or the bends) caused by gas bubbles appearing in body compartments due to a reduction in ambient pressure. Examples of symptoms of decompression illness include (but are not limited to): joint pain (also known as the `bends' for agonizing pain or the `niggles' for slight pain); areas of bone destruction (termed dysbaric osteonecrosis); skin disorders (such as cutis marmorata, which causes a pink marbling of the skin); spinal cord and brain disorders (such as stroke, paralysis, paresthesia, and bladder dysfunction); cardiopulmonary disorders, such as shortness of breath; and arterial gas embolism (gas bubbles in the arteries that block blood flow).

Note: Health effects associated with hyperbaric intervention but not considered symptoms of DCI can include: barotrauma (direct damage to air-containing cavities in the body such as ears, sinuses and lungs); nitrogen narcosis (reversible alteration in consciousness that may occur in hyperbaric environments and is caused by the anesthetic effect of certain gases at high pressure); and oxygen toxicity (a central nervous system condition resulting from the harmful effects of breathing molecular oxygen (O₂) at elevated partial pressures).

6. Earth Pressure Balanced Tunnel Boring Machine—the machinery used to excavate the tunnel.

7. Hot work—any activity performed in a hazardous location that may introduce an ignition source into a potentially flammable atmosphere.

8. Hyperbaric—at a higher pressure than atmospheric pressure.

9. Hyperbaric intervention—a term that describes the process of stopping the EPBTBM and preparing and executing work under hyperbaric pressure in the working chamber for the purpose of inspecting, replacing, or repairing cutting tools and/or the cutterhead structure.

10. Hyperbaric Operations Manual—a detailed, project-specific health and safety plan developed and implemented by IHP JV for working in compressed air during the construction of the Anacostia River Tunnel.

11. Job hazard analysis—an evaluation of tasks or operations to identify potential hazards and to determine the necessary controls.

12. Man lock—an enclosed space capable of pressurization, and used for compressing or decompressing any employee or material when either is passing into or out of a working chamber.

13. Pressure—a force acting on a unit area. Usually expressed as pounds per square inch (p.s.i.).

14. p.s.i.—pounds per square inch, a common unit of measurement of pressure; a pressure given in p.s.i. corresponds to absolute pressure.

15. p.s.i.a—pounds per square inch absolute, or absolute pressure, is the sum of the atmospheric pressure and gauge pressure. At sea-level, atmospheric pressure is approximately 14.7 p.s.i. Adding 14.7 to a pressure expressed in units of p.s.i.g. will yield the absolute pressure, expressed as p.s.i.a.

16. p.s.i.g.—pounds per square inch gauge, a common unit of pressure; pressure expressed as p.s.i.g. corresponds to pressure relative to atmospheric pressure. At sea-level, atmospheric pressure is approximately 14.7 p.s.i. Subtracting 14.7 from a pressure expressed in units of p.s.i.a. yields the gauge pressure, expressed as p.s.i.g.

17. Qualified person—an individual who, by possession of a recognized degree, certificate, or professional standing, or who, by extensive knowledge, training, and experience, successfully demonstrates an ability to solve or resolve problems relating to the subject matter, the work, or the project.

18. Working chamber—an enclosed space in the EPBTBM in which CAWs perform interventions, and which is accessible only through a man lock.

E. Safety and Health Practices

1. IHP JV must develop and implement a project-specific HOM, and submit the HOM to OSHA for approval at least six months before using the EPBTBM. IHP JV must receive a written acknowledgement from OSHA regarding the acceptability of the HOM. The HOM shall provide the governing safety and health requirements regarding hyperbaric exposures during the tunnel-construction project.

2. IHP JV must implement the safety and health instructions included in the manufacturer's operations manuals for the EPBTBM, and the safety and health instructions provided by the manufacturer for the operation of decompression equipment.

3. IHP JV must use air as the only breathing gas in the working chamber.

4. IHP JV must use the 1992 French Decompression Tables for air, air-oxygen, and oxygen decompression specified in the HOM, specifically, the tables titled, “French Regulation Air Standard Tables.”

5. IHP JV must equip man locks used by its employees with an oxygen-delivery system as specified by the HOM. IHP JV must not store oxygen or other compressed gases used in conjunction with hyperbaric work in the tunnel.

6. Workers performing hot work under hyperbaric conditions must use flame-retardant personal protective equipment and clothing.

7. In hyperbaric work areas, IHP JV must maintain an adequate fire-suppression system approved for hyperbaric work areas.

8. IHP JV must develop and implement one or more JHAs for work in the hyperbaric work areas, and review, periodically, and as necessary (e.g., after making changes to a planned intervention that affects its operation), the contents of the JHAs with affected employees. The JHAs must include all the job functions that the risk assessment indicates are essential to prevent injury or illness.

9. IHP JV must develop a set of checklists to guide compressed-air work and ensure that employees follow the procedures required by this permanent variance (including all procedures required by the HOM, which this permanent variance incorporates by reference). The checklists must include all steps and equipment functions that the risk assessment indicates are essential to prevent injury or illness during compressed-air work.

10. IHP JV must ensure that the safety and health provisions of the HOM adequately protect the workers of all contractors and subcontractors involved in hyperbaric operations.

F. Communication

1. Prior to beginning a shift, IHP JV must implement a system that informs workers exposed to hyperbaric conditions of any hazardous occurrences or conditions that might affect their safety, including hyperbaric incidents, gas releases, equipment failures, earth or rock slides, cave-ins, flooding, fires, or explosions.

2. IHP JV must provide a power-assisted means of communication among affected workers and support personnel in hyperbaric conditions where unassisted voice communication is inadequate.

(a) IHP JV must use an independent power supply for powered communication systems, and these systems must operate such that use or disruption of any one phone or signal location will not disrupt the operation of the system from any other location.

(b) IHP JV must test communication systems at the start of each shift and as necessary thereafter to ensure proper operation.

G. Worker Qualifications and Training

IHP JV must:

1. Ensure that each affected worker receives effective training on how to safely enter, work in, exit from, and undertake emergency evacuation or rescue from, hyperbaric conditions, and document this training.

2. Provide effective instruction, before beginning hyperbaric operations, to each worker who performs work, or controls the exposure of others, in hyperbaric conditions, and document this instruction. The instruction must include topics such as:

(a) The physics and physiology of hyperbaric work;

(b) Recognition of pressure-related injuries;

(c) Information on the causes and recognition of the signs and symptoms associated with decompression illness, and other hyperbaric intervention-related health effects (e.g., barotrauma, nitrogen narcosis, and oxygen toxicity);

(d) How to avoid discomfort during compression and decompression; and

(e) Information the workers can use to contact the appropriate healthcare professionals should the workers have concerns that they may be experiencing adverse health effects from hyperbaric exposure.

3. Repeat the instruction specified in paragraph (2) of this condition periodically, and as necessary (e.g., after making changes to its hyperbaric operations).

4. When conducting training for its hyperbaric workers, make this training available to OSHA personnel and notify the OTPCA at OSHA's national office and the Baltimore/Washington DC Area Office before the training takes place.

H. Inspections, Tests, and Accident Prevention

1. IHP JV must initiate and maintain a program of frequent and regular inspections of the EPBTBM's hyperbaric equipment and support systems (such as temperature control, illumination, ventilation, and fire-prevention and fire-suppression systems), and hyperbaric work areas, as required under 29 CFR 1926.20(b)(2) by:

(a) Developing a set of checklists to be used by a competent person in conducting weekly inspections of hyperbaric equipment and work areas; and

(b) Ensuring that a competent person conducts daily visual checks and weekly inspections of the EPBTBM.

2. If the competent person determines that the equipment constitutes a safety hazard, IHP JV must remove the equipment from service until it corrects the hazardous condition and has the correction approved by a qualified person.

3. IHP JV must maintain records of all tests and inspections of the EPBTBM, as well as associated corrective actions and repairs, at the job site for the duration of the job.

I. Compression and Decompression

IHP JV must consult with its attending physician concerning the need for special compression or decompression exposures appropriate for CAWs not acclimated to hyperbaric exposure.

J. Recordkeeping

IHP JV must maintain a record of any recordable injuries, illnesses, in-patient hospitalizations, amputations, loss of an eye, or fatality (as defined by 29 CFR part 1904 Recording and Reporting Occupational Injuries and Illnesses), resulting from exposure of an employee to hyperbaric conditions by completing the OSHA 301 Incident Report form and OSHA 300 Log of Work Related Injuries and Illnesses.

Note: Examples of important information to include on the OSHA 301 Incident Report form (along with the corresponding question on the form) must address the following: the task performed (Question (Q) 14); an estimate of the CAW's workload (Q 14); the composition of the gas mixture (e.g., air or oxygen); the pressure worked at (Q 14); temperature in the work and decompression environments (Q 14); did something unusual occur during the task or decompression (Q 14); time of symptom onset (Q 15); duration of time between decompression and onset of symptoms (Q 15); nature and duration of symptoms (Q 16); a medical summary of the illness or injury (Q 16); duration of the hyperbaric intervention (Q 17); any possible contributing factors (Q 17); the number of prior interventions completed by injured or ill CAW (Q 17); the number of prior interventions completed by injured or ill CAW at that pressure (Q 17); the contact information for the treating healthcare provider (Q 17); and the date and time of last hyperbaric exposure for this CAW.

In addition to completing the OSHA 301 Incident Report form and OSHA 300 Log of Work Related Injuries and Illnesses, IHP JV must maintain records of:

1. The date, times (e.g., began compression, time spent compressing, time performing intervention, time spent decompressing), and pressure for each hyperbaric intervention.

2. The name of each individual worker exposed to hyperbaric pressure and the decompression protocols and results for each worker.

3. The total number of interventions and the amount of hyperbaric work time at each pressure.

4. The post-intervention physical assessment of each individual CAW for signs and symptoms of decompression illness, barotrauma, nitrogen narcosis, oxygen toxicity or other health effects associated with work in compressed air or mixed gasses for each hyperbaric intervention.

K. Notifications

1. To assist OSHA in administering the conditions specified herein, IHP JV must:

(a) Notify the OTPCA and the Baltimore/Washington DC Area Office of any recordable injuries, illnesses, in-patient hospitalizations, amputations, loss of an eye, or fatality (by submitting the completed OSHA 301 Incident Report form ) resulting from exposure of an employee to hyperbaric conditions including those that do not require recompression treatment (e.g., nitrogen narcosis, oxygen toxicity, barotrauma), but still meet the recordable injury or illness criteria (of 29 CFR 1904). The employer shall provide the notification within 8 hours of the incident, or 8 hours after becoming aware of a recordable injury, illness, in-patient hospitalization, amputation, loss of an eye, or fatality, and submit a copy of the incident investigation (OSHA form 301) within 24 hours of the incident, or 24 hours after becoming aware of a recordable injury, illness, in-patient hospitalization, amputation, loss of an eye, or fatality. In addition to the information required by the OSHA form 301, the incident-investigation report must include a root-cause determination, and the preventive and corrective actions identified and implemented.

(b) Provide certification within 15 days of the incident that the employer informed affected workers of the incident and the results of the incident investigation (including the root-cause determination and preventive and corrective actions identified and implemented).

(c) Notify the OTPCA and the Baltimore/Washington DC Area Office within 15 working days in writing of any change in the compressed-air operations that affects IHP JV's ability to comply with the conditions specified herein.

(d) Upon completion of the Anacostia River Tunnel project, evaluate the effectiveness of the decompression tables used throughout the project, and provide a written report of this evaluation to the OTPCA and the Baltimore/Washington DC Area Office.

Note:

The evaluation report is to contain summaries of: (1) The number, dates, durations, and pressures of the hyperbaric interventions completed; (2) decompression protocols implemented (including composition of gas mixtures (air and/or oxygen), and the results achieved; (3) the total number of interventions and the number of hyperbaric incidents (decompression illnesses and/or health effects associated with hyperbaric interventions as recorded on OSHA 301 and 300 forms, and relevant medical diagnoses and treating physicians' opinions); and (4) root-causes, and preventive and corrective actions identified and implemented.

(e) To assist OSHA in administering the conditions specified herein, inform the OTPCA and the Baltimore/Washington DC Area Office as soon as possible after it has knowledge that it will:

(i) Cease to do business;

(ii) Change the location and address of the main office for managing the tunneling operations specified by the project-specific HOM; or

(iii) Transfer the operations specified herein to a successor company.

(f) Notify all affected employees of this permanent variance by the same means required to inform them of its application for a variance.

2. OSHA must approve the transfer of this permanent variance to a successor company.

Authority and Signature

David Michaels, Ph.D., MPH, Assistant Secretary of Labor for Occupational Safety and Health, 200 Constitution Avenue NW., Washington, DC 20210, authorized the preparation of this notice. Accordingly, the Agency is issuing this notice pursuant to 29 U.S.C. 655(d), Secretary of Labor's Order No. 1-2012 (77 FR 3912, Jan. 25, 2012), and 29 CFR 1905.11.