Provision of consulting assistance for preparation of a project proposal of Sofia Municipality: Construction of a Regional Wastewater Treatment Plant (WWTP) on the Lesnovska River in the area of the village of Dolni Bogrov for wastewater treatment from settlements: Kremikovtsi Seslavtsi, Botunets quarter, Buhovo, Yana village, Gorni Bogrov village, Krivina village, Kazichene village and drainage collectors from the settlements to the WWTP – first A stage for Kremikovtsi and Seslavtsi ”, Including discharge collector III (Seslavtsi / RSh 57 /, SSh 9, SSh 8, PS № 1 / Kremikovtsi-Seslavtsi /); outlet collector IV (Kremikovtsi / existing shaft /, collection shaft № 9 of outlet collector ІІІ) and part of outlet collector V (collection shaft № 7, inspection shaft № 3b / in front of WWTP /) ”. Code under CPC – 79421200