Volunteer Paul Bareno’s yellow shirt makes him easy to see as he helps clean up a stretch of San Diego riverbed. “We were here, I’m guessing, we were here about two months ago, maybe less. And we got it pretty clean. Yeah we hit the same amount of places regularly,” said Bareno. There is plenty to clean up. There are clothes, food wrappers and at one campsite, long strips of yellow plastic tubing that’s supposed to be a temporary sandbag. None of it is surprising.