Discharge of oil sludge into a centralized drainage system. After applying of Almetyevskiy municipal service, inspectors of the South-Eastern Territorial Administration of the Ministry of Ecology and Natural Resources of the Republic of Tatarstan resolved who allowed the unauthorized connection in Tikhonovka village. To find out the offenders, environmentalists installed a photo-trap. And in the near future, technical equipment allowed to capture how sewage trucks performed sewage disposal.