Badly needed fixes to Tijuana’s wastewater system — which recently leaked millions of gallons of raw sewage into the Pacific Ocean, fouling beaches as far north as Coronado — may have to wait. President Trump’s proposed budget released Thursday slashes funding for the Environmental Protection Agency by a whopping $5.7 billion dollars or 31 percent. Those cuts include dollars for the U.S.-Mexico Border Water Infrastructure Grant Program, which officials in San Diego and elsewhere hoped would help fix Tijuana’s aging sewer pipes and an ailing water treatment facility along the coast of Baja California.