The best way to approach this cache is by bicycle as it starts along the Veteran's Memorial Trail. There's also forest preserve parking very nearby.
As of 10/7/2018, calculations at Stage 1 have been modified since original method lacked permanence.
Stage 1 takes you to a sign which reads "No Motor Vehicles." Nearby is a tall post with four signs affixed to it, one of which is Trail Rules. At the bottom of the trail rules sign, is a 10-digit number. Assign the values of the number to ABCDEFGHIJ.
Final is at N 41 40.ABE W 088 01.FCG
Watch for Motor Vehicles as you seek this cache.