A toxic fuel plume that for decades contaminated soil and groundwater under the former Qualcomm Stadium parking lot in Mission Valley has finally been cleaned up, officials announced Wednesday. Roughly 1.6 million gallons of fuel leaked from the nearby Mission Valley Terminal in the 1980s and ‘90s, according to the San Diego Regional Water Quality Control Board. Kinder Morgan Energy Partners became responsible for the cleanup after acquiring the facility in 1998, several years after the water board discovered the contamination. The spill is one of largest of its kind in California.