All kinds of stuff with this one. Let's start with the route you do serve and the description of the standard hours as well as your actual work hours. The route IS overburdened. From Article 9 in The Nat'l Agreement ;
8. Overburdened Routes
a. Definition
A route is considered overburdened when:
(1) The standard hours for the route are out-
side of the Table of Evaluated Hours; or
(2) The regular rural carrier who is assigned to
the route does not, or is not expected to, meet
the requirement to stay within the annual
guarantee for the route
So, from the above , the route / you qualify for this also from Article 9 ;
b. Relief of Overburdened Routes
Permanent relief will be arranged as soon as prac-
ticable for overburdened routes. Auxiliary assis-
tance may be provided as a temporary means
of providing relief for those routes as defined in
8.a.(1). Assistance is provided, equivalent to the
lesser of the following:
(1) The regular rural carrier’s actual weekly work
hours that are in excess of 48 hours (K classi-
fication); or
(2) The standard hours for the route that are
in excess of 57:36.
Has relief been arranged for you ? I highlighted the "will be" so there would be no doubt. With respect to working on Sunday , there is this from Article 30 ;
P. Other Route Assignments
A regular rural carrier shall not be required to serve all
or part of any rural route other than his or her assigned
route except as provided in ELM, Section 546
There is also this from Article 8 ;
Section 1. Work Week
The basic work week for regular rural carrier employees
shall be six (6) days, except as relief days are provided for
certain carriers and for carriers serving triweekly routes.
Regular rural carriers may not work on Sunday
W-7 and M-12 and all of those other "route numbers" that are delivered on Sunday ARE NOT your assigned route AND they are delivered on Sunday. In the event you do end up working on Sunday and THAT time is by the hour and given the hours you stated you average each week, you would be paid at the overtime rate which falls under this from Article 8 ;
B. Overtime Rate
When a rural carrier craft employee is being compen-
sated on an hourly basis, overtime pay is to be paid
at the rate of 150% of the basic hourly straight time
rate for regular carriers except in those instances when
FLSA overtime is applicable
After all of THAT, there is this MOU ;
UPDATE: NRLCA and USPS Sign MOU Allowing Regular Rural Carriers to Volunteer to Work on Sundays and Provide Assistance on other Rural Routes
You note that the word(s) VOLUNTEER are emphasized. If you DO get stuck working Sunday and I am lobbying on your behalf , in addition to your pay at the overtime rate for the Sunday work, I would accept no less than 4 times your overtime rate as the penalties for the hours you worked on Sunday. One multiplier for EACH of the aforementioned violations ; permanent relief not arranged from Article 9 ( I'm assuming it hasn't been ) , the "other route assignments " from Article 30, the "regular carriers may not work Sunday" from Article 8 , and the MOU that explicitly states "volunteer".
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