A wastewater treatment plant being built six miles south of the border continues to be plagued by delays in construction and now, per a Border Report investigation, design flaws. Originally, the facility was supposed to open last September, but five months later, its future remains in limbo. A source familiar with the plant’s design says initial test-runs have failed due to the type of pumps set in place during construction. He tells Border Report water pumps were installed instead of pumps required for mud, thick fluids and sediment. … Most of (Imperial Beach’s) beaches have been closed for more than two years due to sewage pollution that flows in from Mexico.