I called the Ukiah field office to ask about how to go about organizing something and they have a person who is in charge of cleanups. Typically, on an annual basis, they bring up a 40CY dumpster then hire inmates to do the cleanup. I will email them and ask if they have anything planned soon and how we would go about coordinating with them. If anyone is interested in being on an email list to be notified about timing, please PM me your email and I will set up a group email.
They are also in the process of setting up interim rules prohibiting use of firearms anywhere but at the range to help prevent the trash that you see along the sides of the roadway on the way up to the range. They would like to cleanup these other areas as well.
Anyhow, send me your emails if you want to be part of a group list for cleanup coordination at North Cow. I will also update via posts here.