This is a challenge caches and the final IS at the posted coordinates. You can sign the log any time, but cannot claim the find until you have met the challenge as listed below. There is no parking along Marksheffel Rd so please see the parking waypoints. There is sidewalk the whole way so walking or biking it is great.
This hide requires a TOTT to reach the container.
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The Challenge

To qualify for this challenge you need to find a cache that has the challenge attribute on at least 91 calendar days of the year. The year you made the find does not matter. Feb 29 (Leap day) is not included. This cache does not count toward qualifying.

I got the inspiration for this challenge from DrPowercat's The I Challenge You To A Challenge Challenge, GCA4H7Z