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Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Proposed Rules south in the following paragraphs and are summarized in Table 2 at the end of this section.
Section S499/Pier 2: Currently, this section of bulkhead is in serious condition and has a high priority for replacement/repair because the steel sheet pile has widespread moderate-toadvanced corrosion across multiple zones. There are also significant section losses of steel sheet pile and timber planking occurring at multiple locations. In addition, the protective coatings have separated and failed along the bulkhead.
Replacement and repair of Section S499/Pier 2 includes the demolition of the existing north marginal wharf;
excavation and replacement of approximately 310 ft of existing steel bulkhead underneath and north of Pier 2; and replacement of approximately 90
ft of rip rap revetment north of Pier 2.
Demolition of the marginal wharf would include the removal of approximately 8,500 square ft ft2 of concrete decking and the demolition of 80 36-inch in diameter concrete encased piles.
The existing bulkhead structure would be replaced with a new combined wall system see Figure 13 of the application. Because of the proximity of important buildings, a deadman and tie rod anchoring system cannot be installed at this location.
Approximately 140 70 pairs 31.5-in sheet piles; 35 42-in steel pipe piles;
and 79 14-in H-piles would be installed approximately 12 in seaward of the existing bulkhead using a vibratory and impact hammer, as necessary. The existing bulkhead would be excavated landside and cut off approximately 5 ft below ground level.
The interstitial space would be backfilled with stone.
Section S366: In its current condition, this section of bulkhead is in a serious condition with a high priority for replacement/repair because the steel sheet piling exhibits heavy corrosion with numerous areas that exhibit 100
percent loss of section, as well as separation of the protective coating, vegetation growth through the structure, and rust pack. The timber planking protecting the concrete encasement has rotted at the waterline in some areas.
Replacement of Section S366 would include the demolition and replacement of approximately 90 ft of existing steel sheet pile bulkhead just north of Pier 1.
The existing bulkhead would then be
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replaced with a new deadman anchored king pile system. The system would consist of approximately 28 14 pairs 22.5-in Z-shaped sheet piles; 15 30-in steel pipe piles; and 14 14-in H-piles.
These piles would be installed approximately 1ft in front of the existing bulkhead using a combination of vibratory and impact hammers, as necessary. The existing steel sheet pile wall would be excavated landside to a depth of approximately 810 ft and cut off at the limit of excavation. An 8-ft high concrete deadman anchor system would be installed approximately 50 ft behind the new bulkhead and would be connected to the bulkhead by tie rods see Figure 16 of the application.
Stone would be used as the backfill material to allow a rapid drop down of the water at the back of the bulkhead after a severe storm.
Section Pier 1: Pier 1 was not accessible during the condition assessment and is assumed to be in similar condition as S366. The waterside inspection was limited due to the presence of vessels and other obstacles that would not allow the inspection vessel to pass NAVFAC
Mid-Atlantic, 2018.
Section Pier 1 includes demolition and replacement of approximately 100 ft of existing steel sheet pile bulkhead underneath Pier 1 see Figure 17 of the application. In order to access the bulkhead underneath the pier, partial demolition of Pier 1 would occur.
Demolition would involve the removal of concrete decking, but the removal of support piles is not anticipated.
Should demolition of the underlying support piles be required to perform bulkhead replacement/repair, the use of impact or vibratory hammers would not be required. Piles would be cut off at mudline or extracted with a sling i.e., dead pull. The existing steel sheet pile wall would be excavated landside to a depth of approximately 13 ft below ground surface and cut off at the limit of excavation. The existing bulkhead would then be replaced with a new deadman and tie rod anchored sheet pile system. The system would consist of approximately 54 27 pairs 22.5-in Z-shaped sheet piles and approximately 26 14-in H-piles. These piles would be installed approximately 1ft in front of the existing bulkhead using a combination of vibratory and impact hammers, as necessary. Bulkhead
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replacement would include shoreline dredging to a depth of approximately 14
ft at the toe of the existing bulkhead to ensure proper installation of the new bulkhead.
Section S45: In its current condition, this section of bulkhead is in serious condition with a high priority for replacement/repair because the steel sheet piles and cap exhibit heavy corrosion with numerous areas that exhibit 100 percent loss of section resulting in extensive landside erosion.
Replacement of Section S45 would include the demolition and replacement of approximately 310 ft of existing steel sheet pile bulkhead just south of Pier 1.
The existing bulkhead would then be replaced with a new deadman anchored king pile system. The system would consist of approximately 4 30-in steel pipe piles; 160 80 pairs 22.5-in Zshaped sheet piles; and approximately 76 14-in H-piles. These piles would be installed approximately 1ft in front of the existing bulkhead using a combination of vibratory and impact hammers, as necessary. The existing steel sheet pile wall would be excavated landside to a depth of approximately 10
ft below ground surface and cut off at the limit of excavation see Figure 18
of the application.
Section LNG: In its current condition, this section of bulkhead is in serious condition with high priority for replacement/repair due to heavy corrosion with numerous areas that exhibit 100 percent loss of section.
Where the steel sheet piling is in poor condition, there is extensive landside erosion.
Section LNG includes excavation and replacement of approximately 650 ft of existing steel bulkhead south of the TPier. The existing bulkhead would be replaced with a new deadman anchored sheet pile system. The system would be similar to the system installed at Pier 1
and would consist of approximately 346
173 pairs 22.5-in Z-shaped sheet piles; and approximately 164 14-in Hpiles. These piles would be installed approximately 1ft in front of the existing bulkhead using a combination of vibratory and impact hammers. The existing steel sheet pile wall would be excavated landside to a depth of approximately 13ft below ground surface and cut off at the limit of excavation.

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