So, I am very meticulous and an extremely visual person. I made this PDF for my friend and I illustrating the walk from Orbaneja Riopico, through Castañares, and into Burgos along the river. This is an alternate to the industrial route. This was made in part to the directions provided by @annakappa on her thread: Alternate route into Burgos and Clarely's blog post How to enter Burgos. I hope it helps people who do better with pictures than words like me! The PDF includes street view of the walk, as well as top-view images when the former wasn't available.