Constitution Grove Multi-Cache

This is a very quick two stage multi. The stages are just 400 feet or so apart.

TO FIND THE FINAL COORDINATES:
Go to the monument that says "Constituion Grove"
What YEAR (not  month or day) was this monument dedicated?

 Put that in the form of ABCD
(For example, if the year was 1864 A=1 B=8 C=6 D=4)

Now do the math below to get the final coordinates.
Final Coordinates are N 40 33.(A+2) (A) (D-3) W 074 50. (A) (B-7) (A) 

Final is hidden in plain sight. Do not tear up anything--you are probably looking right at it. 

This is hidden for the Coffee event on 6/16/12.

Thanks and GOOD LUCK!