Changes coming (tomorrow?) in crossing Atlantic at Sixth; smaller fence planned on Dean Street because of (unplanned?) gas line work

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Last Friday, the developers of Pacific Park Brooklyn circulated a Community Notice indicating "Temporary Changes to the Roadway Network on Atlantic Avenue, Sixth Avenue, and Pacific Street Starting on December 30th or 31st, 2014."

These changes, notably the shift in crossing Atlantic Avenue from the west side to the east side of Sixth Avenue, were noticed--though the days weren't specified--in the previous Construction Update.

The notice stated:

As part of construction related to the Pacific Park Brooklyn (formerly Atlantic Yards) project, the following temporary changes will be made to the roadway network:
1. One block of Sixth Avenue, between Atlantic Avenue and Pacific Street, has been converted from two-way traffic to one-way northbound only and will remain so for approximately six months. Sixth Avenue will remain two-way south of Pacific Street.
2. The southwest corner of Atlantic and Sixth Avenues will be closed to pedestrians.
3. The southeast corner of Atlantic and Sixth Avenues will be reopened to pedestrians.
4. At the intersection of Atlantic and Sixth Avenues, both the west crosswalk (which crosses Atlantic Avenue) and the south crosswalk (which crosses Sixth Avenue) will be closed. Those crossing Atlantic Avenue must use the east crosswalk, which will be reopened. Those crossing Sixth Avenue must either use the crosswalk at Pacific Street, or use the crosswalk at S. Portland Avenue.

The north sidewalk on Pacific Street, near Sixth Avenue, will remain closed to pedestrian traffic for another six months. No further changes to bus stop locations or parking regulations are being made at this time.

Adjustments of work zones and roadway striping on Atlantic and Sixth Avenues will occur both overnight and during daytime hours and are expected to take two days/nights to complete. 

This work zone roadway confi­guration is expected to be in place for approximately four months. Work will occur during daytime hours, however, occasional night work may be required.

Smaller fence coming

Last Wednesday, Empire State Development circulated an addendum to the latest Atlantic Yards/Pacific Park Construction Update, indicating--not so clearly--that a recently installed tall fence would be replaced temporarily by a smaller fence:

Block 1129
New Information:
From approximately January 2nd to January 23rd work by National Grid to relocate a gas line in the Dean Street sidewalk between Carlton Avenue and Vanderbilt Avenue will take place. Because that work conflicts with the location of the 16 foot fence for the Block 1129 construction, lower fences, eight to twelve feet, will initially be installed in front of that work zone. The work zone is approximately 150 feet long and about 125 feet west of Vanderbilt Avenue. It is expected that the 16 foot fence will be constructed and in place by January 23rd.

First, this seems misleading: a 16-foot fence has already been installed, as I understand it, so it would have to be replaced by the shorter fences, only to be restored.

Also, it's not clear to me why this wasn't anticipated. Was there some change in the situation on the ground?