A report released this week reveals that wastewater disposal ponds used for oil and gas production in California could potentially contaminate groundwater and exacerbate the San Joaquin Valley’s already poor air quality. The study, commissioned by the San Francisco-based group Clean Water Action, investigated hundreds of open and unlined disposal sumps throughout the region and concludes the state’s regulatory agencies have failed to protect natural resources and public health. Pacifica’s Vic Bedoian reports from Fresno.