I am familiar with the "coffee grounds" appearance left by these worms. What I did find very close to these were many small jumping worms. As I dug out further, I found larger jumping worms, but no noticeable damage to the soil. I usually see that later in the summer. I used ImapInvasives a few years back to document the jumping worms I found under planters by my greenhouse, so I know they are in my yard. I gather them as I find them and solarize them. I have reached out to John Thompson, CRISP Coordinator of Catskill Center and awaiting a reply.