Where does it say in the contract they can't?
In the Central. you are still guaranteed 8 hours if you show up. But you are not guaranteed to work everyday. Your 40 hour guarantee is void due to snow storm, acts of God....
ARTICLE 12-HOURS OF WORK
Section 1
There shall be a weekly guarantee in each center as follows: In each
classification in each center, the most senior ninety percent (90%)
of employees called or put to work on the first (1st) workday shall
be afforded the opportunity of working forty (40) hours of straight
time work during the week.
The guarantee shall not apply:
(a) to an employee who fails to work a scheduled workday during
the workweek, or is suspended or discharged for just cause;
(b) when there are conditions beyond the Employer’s control such
as fire, flood, destruction, strikes, snow storm, or Acts of God, and
these conditions cause a curtailment of all or part of an Employer’s
operation; or,
(c) the weeks of Christmas, New Years and Fourth of July. Any time
off during this period will be offered by seniority, when business
conditions allow.