The DRXC trail system has now been groomed and trackset except for B-loop, which is too rough for this amount of snow. The grooming has improved the skiing, but the ground is very close to the surface. Based on how often the groomers hit ground, D, R and M have the fewest high spots, perhaps two dozen in total. X and H have more while C and S are ridiculous. The C-loop hazards all tend to be rocks, which grab skis very effectively.
All skate surfaces and set tracks definitely have sand, logs or rocks right at the surface, possibly not very visible. If you see a foot-stool-size lump, e.g. S-loop, there is definitely something hard inside -- not just snow.
S-loop is especially hazardous because of uneven terrain and surface water that is undermining large sections of the trail. Someone broke into one of the puddles that was probably not visible ahead of time.
Especially note that there is a big (enough for a small person to curl up inside) sink hole in the most hazardous possible location on the left side at the bottom of the first S downhill -- bear right as you cross the stream, or fall down ahead of time if necessary. The set track was intended to help skiers to ski past this hole, but the snow is not firming up well and no one should depend on the track. Remember routine trail etiquette -- if you make a sitzmark, FILL IT IN afterward.