Appeal 24021

ossc 1028.1

*Code Section

OSSC 1022.1 An exit shall not be used for any purpose that interferes with its function as a means of egress. Once a given level of exit protection is achieved, such level of protection shall not be reduced until arrival at the exit discharge. Exits shall be continuous from the point of entry into the exit to the exit discharge.

OSSC 1023.1 Interior exit stairways shall be enclosed and lead directly to the exterior of the building or shall be extended to the exterior of the building with an exit passageway conforming to the requirements of Section 1024, except as permitted in Section 1028.1.

OSSC 1024.3 Construction: Exit passageway enclosures shall have walls, floors and ceilings of not less than 1-hour fire-resistance rating and not less than that required for any connecting interior exit stairway. Exit passageways shall be constructed as fire barriers in accordance with Section 707.

Reconsideration text:
OSSC 1028.1: Exits shall discharge directly to the exterior of the building. The exit discharge shall be at grade or shall provide a direct path of egress travel to grade. The exit discharge shall not reenter a building. The combined use of Exceptions 1 and 2 shall not exceed 50 percent of the number and minimum width or required capacity of the required exits.
Exception 1: Not more than 50 percent of the number and minimum width or required capacity of interior exit stairways and ramps is permitted to egress through areas on the level of discharge provided that all of the following conditions are met:
1.1 Discharge of interior exit stairways shall be provided with a free and unobstructed path of travel to an exterior exit door and such exit is readily visible and identifiable from the point of termination of the enclosure.
1.2 The entire area of the level of exit discharge is separated from areas below by construction conforming to the fire-resistance rating for the enclosure.
1.3 The egress path from the interior exit stairway and ramp on the level of exit discharge is protected throughout by an approved automatic sprinkler system…
1.4 Where a required interior exit stairway or ramp and an exit access stairway serve the same floor level and terminate at the same level of exit discharge, the termination of the exit access stairway and the exit discharge door of the interior exit stairway or ramp shall be separated by a distance of not less than 30 feet or not less than one-forth the length of the maximum overall diagonal dimension of the building, whichever is less…

(Summarize the intent of the appeal, preferably in one sentence.)
We are requesting allowance to use of the tug road as a portion the exit passageway leading from the stairs to the exterior of the building for the duration of the construction of the western expansion. The tug road is open on both ends, but not open to the sky.

At the Deplaning level of the existing airport, the exit access stairs currently exit directly to the exterior at the airfield to the west. Under the proposal Terminal western expansion, this current exit path will be in the construction zone and, ultimately, the expanded terminal. As a result, during construction, the exit access must be rerouted away from the construction zone.

Occupants in the terminal have numerous available exit routes, but for the occupants on the most westerly portions of the terminal, the exit via T3508/T2450/T1580 is the only one that is within the maximum allowable exit travel distance. Rerouting the exit access to the north provides the most direct exit path for these occupants. At the bottom of this stair, on the deplaning level, occupants will enter a newly constructed exit passageway for approximately 50’ before this exit passageway opens onto a service road. The service road ranges from 56’ to 28’ in width and it’s length is the width of the concourse (124’). The service road has a 2-hour concrete floor/ceiling above and a concrete floor. Concrete walls separate it from the Terminal on the east and from the Concourse D on the west. This area is currently open to the exterior on the north and south ends; however, the south end will become the construction zone for the western expansion of the Terminal. This area is protected via a sprinkler system and detection devices and is monitored by the Port’s 24-hour communication center.

Reconsideration Text:

The conditions proposed in this appeal will be temporary and only apply during the construction of the western expansion of the Terminal. This is anticipated to be approximately 2 ½ years. We are requesting the proposed conditions be approved as part of the Occupancy Safety Plan measures that will be implemented during the construction of the Terminal improvements. During the course of the construction, occupant loads on stair T2450/T1580 will be progressively reduced as portions of the Terminal are vacated. The loads indicated in the narrative and exhibits are the highest anticipated calculated loads.

Once the western expansion has been completed, the Terminal will have a new, code compliant exit system which is to be approved as part of the permitting of the expansion.

As part of the construction, the north and south tug roads related to these appeals will be closed to tug traffic and will be used for pedestrian traffic only.

Stair T2450/T1580 is used by the public for emergency exit access only

Occupants in this area will be effectively afforded the same level of protection as they would have in a bona-fide exit passageway, due to the construction and life safety elements that are in place.

Calculated distances from the most remote portions of the Terminal are noted below for reference:

• Occupants from northwest portion of Mezzanine (138 occupants):
o Max travel 124’ to exit stair T3508/T2450/T1580
o Max travel 319’ to exterior open to sky
o Maximum allowable travel 300’ (B occupants).
o Mezzanine vacated approximately 9.1.2021.

• Occupants from northwest non-secured portion of Enplaning (188 occupants):
o Max travel 198’ to exit stair T2450/T1580
o Max Travel 386’ to exterior open to sky.
o Next closest exit is 345’ travel distance..
o Maximum code allowable travel 250’ (A occupants).

• Occupants from northwest portion of Deplaning (74 occupants):
o Max travel approx. 425’ to exterior open to sky.
o Note Appeal #5044, item 4 granted travel distances on deplaning to less than 460 feet.

Please see Exhibits 1-4 for annotated plans of north end of mezzanine, enplaning, deplaning levels.

Note: Similar appeals have been approved in the past. #B-6 and B-8 are attached for reference.

Reconsideration Text:

Once an occupant enters the tug road area from the bona fide exit passageway, the visual condition will be similar to that of a lobby meeting the criteria of OSSC 1028.1. Occupants will have a physically and visually free and unobstructed path of travel to the exit discharge, open to air.

Please see attached updated Exhibits EX1-4 and new Exhibit EX4B. The location of the Exit Discharge to open air is more clearly indicated on the updated exhibits and the total travel distances from the most remote locations on each level to the Exit discharge at open air are also indicated on the exhibits and are as follows:
• Mezzanine level: 319’
• Enplaning level: 386’
• Deplaning level: 425’

The distance from the exit door to open air is 109’. Photos of the existing tug road are included on exhibit EX4B with corresponding notation on Exhibits EX3 and 4 showing approximate view locations.

A copy of appeal 5044 with the language related to the 460’ highlighted has been included for reconsideration.

OSSC 1024.5 Openings

OSSC 1024.5 Openings. …openings in exit passageways other than unprotected exterior openings shall be limited to those necessary for exit access to the exit passageway from normally occupied spaces and for egress from the exit passageway.

Occupant exiting from the offices on the north end mezzanine level of the Airport Terminal, and occupants exiting from the north west portion of the Airport Terminal will utilize interior exit stair T3508/T2450/T1580 to the Deplaning level as one of their exit paths. In order to comply with the code, these exit stairs must exit directly to the exterior or be extended to the exterior with an exit passageway is to have fire barrier walls, floor and ceiling constructed to the fire resistive rating equivalent to the required rating of the stairs (1-hour). Per the code, openings into the passageway, other than those required for exit access, shall be protected.

Under Appeal #1, we are requesting to be able to use the tug road as a portion the exit passageway leading from the stairs to the exterior of the building. There are four unprotected openings for overhead doors that open onto the proposed exit passageway along this tug road. Under this appeal, we are requesting that these doors allow to remain as is.

At the Deplaning level of the existing airport, the exit access stairs currently exit to the exterior airfield to the west. Under the proposal Terminal western expansion, this current exit path will be occupied by the construction and, ultimately, the expanded terminal. During construction, the exit access must be rerouted away from the construction zone.

Occupants in the terminal have numerous available exit routes, but for the occupants on the most westerly portions of the terminal, the exit via T3508/T2450/T1580 is the only one that is within the maximum allowable exit travel distance. Rerouting the exit access to the north provides the most direct exit path for these occupants. At the bottom of this stair, on the deplaning level, occupants will enter a newly constructed exit passageway for approximately 50’ before this exit passageway opens onto a service road. The service road ranges from 56’ to 28’ in width and it’s length is the width of the concourse (124’). The service road has concrete ceiling, concrete floor and concrete walls separating it from the Terminal on the east and Concourse D on the west. This area is currently open to the exterior on the north and south ends; however, the south end will become the construction zone for the western expansion of the Terminal. This area is protected via a sprinkler system and detection devices and is monitored by the Port’s 24-hour communication center.

Reconsideration Text:

We propose to install new sprinkler heads directed at the (4) unprotected overhead doors openings facing the proposed egress path along the tug road.

Along the east side of the service road there are (4) unprotected overhead doors separating a baggage MAU room from the service road. These doors are approximately 250 SF each. The baggage MAU room is separated from the rest of the terminal by CMU walls and Concrete floor/ceiling, providing a fire barrier of at least 2 hours, effectively providing a separate fire area and protection for a fire event for occupants utilizing this egress path.

Reconsideration Text:
As noted in Appeal #1, the tug roads will be closed to tug traffic during the time that this area is to be used for pedestrian emergency egress. Since the tugs will no longer be using this area, the overhead doors will be locked in the closed position, providing a surface for the sprinklers. The sprinklers will be designed to meet ICC standards, with specific design configuration to be provided to the City for final approval.

1028.1

OSSC 1022.1 An exit shall not be used for any purpose that interferes with its function as a means of egress. Once a given level of exit protection is achieved, such level of protection shall not be reduced until arrival at the exit discharge. Exits shall be continuous from the point of entry into the exit to the exit discharge.

OSSC 1023.1 Interior exit stairways shall be enclosed and lead directly to the exterior of the building or shall be extended to the exterior of the building with an exit passageway conforming to the requirements of Section 1024, except as permitted in Section 1028.1.

OSSC 1024.3 Construction: Exit passageway enclosures shall have walls, floors and ceilings of not less than 1-hour fire-resistance rating and not less than that required for any connecting interior exit stairway. Exit passageways shall be constructed as fire barriers in accordance with Section 707.

Reconsideration Text:

OSSC 1028.1: Exits shall discharge directly to the exterior of the building. The exit discharge shall be at grade or shall provide a direct path of egress travel to grade. The exit discharge shall not reenter a building. The combined use of Exceptions 1 and 2 shall not exceed 50 percent of the number and minimum width or required capacity of the required exits.
Exception 1: Not more than 50 percent of the number and minimum width or required capacity of interior exit stairways and ramps is permitted to egress through areas on the level of discharge provided that all of the following conditions are met:
1.5 Discharge of interior exit stairways shall be provided with a free and unobstructed path of travel to an exterior exit door and such exit is readily visible and identifiable from the point of termination of the enclosure.
1.6 The entire area of the level of exit discharge is separated from areas below by construction conforming to the fire-resistance rating for the enclosure.
1.7 The egress path from the interior exit stairway and ramp on the level of exit discharge is protected throughout by an approved automatic sprinkler system…
Where a required interior exit stairway or ramp and an exit access stairway serve the same floor level and terminate at the same level of exit discharge, the termination of the exit access stairway and the exit discharge door of the interior exit stairway or ramp shall be separated by a distance of not less than 30 feet or not less than one-forth the length of the maximum overall diagonal dimension of the building, whichever is less…

We are requesting allowance to use of the tug road as a portion the exit passageway leading from the stairs to the exterior of the building for the duration of the construction of the western expansion. The tug road is open on both ends, but not open to the sky.

At the Deplaning level of the existing airport, the exit access stairs currently exit directly to the exterior at the airfield to the west. Under the proposal Terminal western expansion, this current exit path will be in the construction zone and, ultimately, the expanded terminal. As a result, during construction, the exit access must be rerouted away from the construction zone.

Occupants in the terminal have numerous available exit routes, but for the occupants on the most westerly portions of the terminal, the exit via T3587/T2528/T1806 is the only one that is within the maximum allowable exit travel distance. Rerouting the exit access to the south provides the most direct exit path for these occupants. At the bottom of this stair, on the deplaning level, occupants will enter a newly constructed exit passageway for approximately 90’ before this exit passageway opens onto a service road. The service road is 27’-6” in width and it’s length is the width of the concourse (124’). The service road has a 2-hour concrete floor/ceiling above and a concrete floor. Concrete walls separate it from the Terminal on the east and from the Concourse C on the west. This area is currently open to the exterior on the north and south ends; however, the north end will become the construction zone for the western expansion of the Terminal. This area is protected via a sprinkler system and detection devices and is monitored by the Port’s 24-hour communication center. Occupants in this area will be afforded the same level of protection as they would have in a bona-fide exit passageway, due to the construction and life safety elements that are in place.

Reconsideration Text:

The conditions proposed in this appeal will be temporary and only apply during the construction of the western expansion of the Terminal. This is anticipated to be approximately 2 ½ years. We are requesting the proposed conditions be approved as part of the Occupancy Safety Plan measures that will be implemented during the construction of the Terminal improvements. During the course of the construction, occupant loads on stair T2528/T1806 will be progressively reduced as portions of the Terminal are vacated. The loads indicated in the narrative and exhibits are the highest anticipated calculated loads.

Once the western expansion has been completed, the Terminal will have a new, code compliant exit system which is to be approved as part of the permitting of the expansion.

As part of the construction, the north and south tug roads related to these appeals will be closed to tug traffic and will be used for pedestrian traffic only.

Stair T2528/T1806 is used by the public for emergency exit access only

Calculated distances from the most remote portions of the Terminal are noted below:

• Occupants from Mezzanine (103 occupants):
o Max travel 260’ to exit stair T3587/T2528/T1806
o Max travel 509’ to exterior open to sky
o Maximum allowable travel 300’ (B occupants).
o Mezzanine vacated approximately 9.1.2021.

• Occupants from Enplaning (53 occupants):
o Max travel 106’ to exit stair T2528/T1806
o Max Travel 328’ to exterior open to sky.
o Other exits 250’ and 277’.
o Maximum allowable travel 250’ (A occupants).

• Occupants from Deplaning-South end (77 occupants):
o Max travel approx.451’ to exit passageway
o Max travel 635’ to exterior open to sky.
o Note Appeal #5044, item 4 granted travel distances on deplaning to less than 460 feet.

Please see Exhibits 5-8 for annotated plans of south end of mezzanine, enplaning, deplaning levels.

Similar appeals have been approved in the past. #B-6 and B-8 are attached for reference.

Reconsideration Text:

Once an occupant enters the tug road area from the bona fide exit passageway, the visual condition will be similar to that of a lobby meeting the criteria of OSSC 1028.1. Occupants will have a physically and visually free and unobstructed path of travel to the exit discharge, open to air.

Please see attached updated Exhibits EX5-8 and new Exhibit EX8B. The location of the Exit Discharge to open air is more clearly indicated on the updated exhibits and the total travel distances from the most remote locations on each level to the Exit discharge at open air are also indicated on the exhibits and are as follows:
• Mezzanine level: 509’
• Enplaning level: 328’
• Deplaning level: 635’

The distance from the exit door to open air is 93’. Photos of the existing tug road are included on exhibit EX4B with corresponding notation on Exhibits EX3 and 4 showing approximate view locations.

A copy of appeal 5044 with the language related to the 460’ highlighted has been included for reconsideration.

OSSC 1024.5

OSSC 1024.5 Openings. …openings in exit passageways other than unprotected exterior openings shall be limited to those necessary for exit access to the exit passageway from normally occupied spaces and for egress from the exit passageway.

Occupant exiting from the offices on the south end mezzanine level of the Airport Terminal, and occupants exiting from the south west portion of the Airport Terminal will be utilizing interior exit stair T3587/T2528/T1806 to the Deplaning level as one of their exit paths. In order to comply with the code, these exit stairs must exit directly to the exterior or be extended to the exterior with an exit passageway is to have fire barrier walls, floor and ceiling constructed to the fire resistive rating equivalent to the required rating of the stairs (1-hour). Per the code, openings into the passageway, other than those required for exit access, shall be protected.

Under Appeal #3, we are requesting to be able to use the tug road as a portion the exit passageway leading from the stairs to the exterior of the building. There is one unprotected opening for an overhead door that open onto the proposed exit passageway along this tug road. We are requesting that this door be allowed to remain as is.

At the Deplaning level of the existing airport, the exit access stairs currently exit to the exterior airfield to the west. Under the proposal Terminal western expansion, this current exit path will be occupied by the construction and, ultimately, the expanded terminal. During constructions, the exit access must be rerouted away from the construction zone.

Occupants in the terminal have numerous available exit routes, but for the occupants on the most westerly portions of the terminal, the exit via T3587/T2528/T1806 is the only one that is within the maximum allowable exit travel distance. Rerouting the exit access to the south provides the most direct exit path for these occupants. At the bottom of this stair, on the deplaning level, occupants will enter a newly constructed exit passageway for approximately 90’ before this exit passageway opens onto a service road. The service road is 27’-6” in width and it’s length is the width of the concourse (124’). The service road has concrete ceiling, concrete floor and concrete walls separating it from the Terminal on the east and Concourse C on the west. This area is currently open to the exterior on the north and south ends; however, the north end will become the construction zone for the western expansion of the Terminal.

Reconsideration Text:

We propose to install new spinkler heads directed at the (2) unprotected overhead doors openings facing the proposed egress path along the tug road. As noted in Appeal #1, the tug roads will be closed to tug traffic during the time that this area is to be used for pedestrian emergency egress.

This area is protected via a sprinkler system and detection devices and is monitored by the Port’s 24-hour communication center.

Along the east side of the service road there are unprotected overhead doors separating the service road area from storage rooms to the south and north. The doors are approximately 100 SF and 250 SF respectively.

Reconsideration Text:
Since the tugs will no longer be using this area, the overhead doors will be locked in the closed position, providing a surface for the sprinklers. The sprinklers will be designed to meet ICC standards, with specific design configuration to be provided to the City for final approval.