The Trump administration has handed a big boost to a private water venture in Southern California, angering California’s senior senator, Democrat Dianne Feinstein, who said the decision could “destroy pristine public land” in the Mojave Desert. In a little-noticed memorandum issued last month, the Department of Interior’s Bureau of Land Management effectively relieved the Cadiz water project of the requirement to undergo a federal environmental review, which the company had sought to avoid. The decision greatly boosts the prospects for Cadiz, which wants to tap water from under the Mojave and sell it to thirsty water districts in Southern California.