Rugby right now is NEITHER a PAC-12 nor a NCAA sport, as I understand it. Collegiate rugby here is administered by "USA Rugby", and the organization of teams is undergoing a big change. A few years back, Cal was in a Northern California conference that included Stanford, Davis, St. Mary's, Chico and others, but now they are trying to create a western conference that mimics the PAC 12. called the PAC Rugby Conference, they have 6 teams: OSU, Cal, UCLA, Arizona, ASU, and Utah. I assume the plan is to get as many of the other 6 PAC-12 schools in as they can, but the problem is one of skill disparity: some schools are clearly "D-1" level (e.g. Cal, UCLA, Utah), and other schools with rugby teams might be rated as D-2 or below (e.g. USC, Washington).