Water quality data shows bacteria levels in the ocean along South Bay beaches have been hundreds of times over what’s considered safe for human health this past week.  The culprit, per usual, is sewage flowing from Mexico into the Tijuana River which empties into the Pacific Ocean just south of San Diego’s southernmost cities. But the people who manage wastewater infrastructure in the U.S.-Mexico border say respite is nigh. Next month, Tijuana’s wastewater agency is set to restore a ruptured sewage main that snapped in half last August. When that happens, sewage has only two places to go: The Tijuana River or an overworked treatment plant on the U.S. side of the border.