Tiny Often Empty Park Madison, NJ Mystery Cache

I've wanted to hide a cache at this Often Empty Park for awhile but could never think of a good hiding spot then I thought, "AHA! Field Puzzle!!"

Go to the Often Empty Park, find the plaque, use the words on the plaque to get the final coords.  Driving from point A to point B is possible but I recommend taking a walk along the gravel path at the end of the street to reach your final destination.  It's a nice little path that the some townspeople use to walk their dogs (watch your step), workers use to get to work, and the town DPW uses as a short cut.  There is great birdwatching back there depending on the time of year and it leads to another often empty spot. Please take a moment to pause along the way to listen and watch for our feathered friends!  OK  

So now for the puzzle:

N 40 AB.CDE W 074 FG.HIJ

A=  4th Full Word

B= 10th Full Word

C= 3rd Full Word minus 8

D= 8th Full Word plus 2

E= 19th Full Word

F= 6th Full Word 

G= 7th Full Word

HI= Years of Service This Man Dedicated to Madison plus 38

J= 5th Full Word 

Bonus points for spotting the grammatical error on the plaque.