Posted coordinates are for parking in this park open dawn to dusk. Take a short walk gathering info to figure out coordinates of container further away. If you have time, there's a nice playground here, paved walking trails, and a mini-disc golf course.
Answers can be found on paved trail, but final isn't in a paved area. Answers won't be found in ABCDEF order. Information locations are within a few hundred feet of each other. Included waypoints are listed in reasonable walking order; waypoints other than final are approximate; there are large objects to observe. The final is within easy walking distance; it is not far.
Final is at N 40 2.ABC W 76 12.DEF where:
A = Last digit of birth year of Anupama Sharma (N 40 2.095 W 76 12.866)
B = Number of letters in Postmaster's full name as shown on plaque (N 40 2.062 W 76 12.852)
C = Number of Zelkova trees (N 40 2.109 W 76 12.854) (Zelkova has no i despite sign)
D = Last digit of birth year of Beth Ann Fritz (N 40 2.092 W 76 12.879)
E = Birth month - death month of Gordon Fritz (N 40 2.095 W 76 12.907)
F = Number of letters in Gordon Fritz nickname SQUARED (N 40 2.095 W 76 12.907)
Check your answers: A+B+C+D+E+F = 35
Congratulations to MidnightsRaiders on the First-to-Find.