M.I.L.L. Race: Ignition Sequence Letterbox Hybrid

A 4-stage letterbox cache on a narrow trail in the Difficult Run stream valley (not on the Cross Country Trail--don't cross bridge at the start; see trailhead waypoint). Please note attributes and prepare accordingly. This cache is part of the five-cache M.I.L.L. series and is a requirement for finding M.I.L.L. Race: Munitions (be sure to write down the ignition sequence you find). This cache has no prerequisites.
 

Is it winter and these photos look too green? Here is a set of photos taken in January:
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For Best Letterbox Hybrid and Best Theme/Series

2017 Best Letterbox Hybrid