Splayed in the desert just south of I-10 along Rita Road is an unruly collection of backpacks, flannel shirts, coats, water bottles, soft-drink cans, pill packages, toothbrushes and toilet paper rolls. Shredded black plastic trash bags are stripped across ocotillo and creosote bushes. Illegal entrants dumped this trash, Pima County officials say. Now the county wants help to clean it up along with at least five other such dumps near Tucson. The county Department of Environmental Quality has asked the state government and a tribe with casino money, the Gila River Indian Community, for $40,000 grants. The money, to which...