This multi will require you to visit two spots prior to the final: a sign, which is at the posted coordinates, and a small memorial marker which can be found at the coordinates below. There is one date on the sign and two at the marker, and you will need all three dates to locate the final cache. Use a simple number substitution in the below formula to give you the final cache coordinates:
North 41° 50.[A-2]B[C-3] West 071° 04.D[E+3]F
The date on the sign at the posted coordinates is 18DB.
The two dates listed on the memorial marker are August 7, 19AF and February 2C, 199E.
The final cache should be a short distance away. Please use stealth when looking as this can be a popular park and remember to BYOP. Hope you enjoyed this little multi!
If you need to, you can check your coordinates here: GeoChecker.com.