In yet another major leak at the crippled Fukushima nuclear power plant, operator Tokyo Electric Power Co. (TEPCO) reported that 750 tons of contaminated rainwater have escaped the plant. Rainwater within that perimeter had up to 8,300 becquerels per liter of beta particle-emitting radioactive substances, such as strontium-90. The leak has likely made its way to the ground, according to the officials, but they do not anticipate the contaminated water spreading further into the sea. The spilled rainwater was discovered in two separate places between the artificial mounds and the ground.