Sofia City Hall has chosen Bulgarian-German consortium Stanilov-Heilit to construct the waste treatment plant in Yana, near Sofia, Bulgarian news agency BTA reported.The selection process was conducted on June 15. The mayor of Sofia, Yordanka Fandukova, has already put pen to paper, authorising the consortium to start construction.Stanilov-Heilit's tabled an offer of 208 808 700 leva for construction with maintenance costs of 9427 949 leva annually. The rival Greek-German consortium offered 240 614 029 leva offer for the construction of the facility and 9828 899 leva for annual maintenance costs, the report said.Offers for Sofia City Hall's largest public tender were tabled last week with only two of the 10 bidders reaching the final stage. These were Bulgarian-German consortium "Stanilov-Heilit," and the joint bid by the Greek "Helektor" and the German "Hochtief.According to Dnevnik daily, after the commission verified the offers, a Sofia City Hall spokesperson said there were "insignificant discrepancies" found in the calculation of the final price, but that these were negligible and did not affect the bids.Other companies bidding for the project will have 10 days to appeal against the decision. Dnevnik daily quoted Maria Boyadjiiska, deputy mayor for the environment and head of the commission, as saying that the actual signing of the contract with the winning firm could be postponed for up to three months. The reason for delay, Boyadjiiska said, is that some of the companies disqualified earlier had said that they would appeal. Once signed, however, the facility must be constructed within two years.The "Stanilov" firm, or the Bulgarian part of the consortium, belongs to Georgi Stanilov. The company is also involved in the construction of the Sofia Metro and has built other waste treatment plants.The firms disqualified at earlier stages were Glavbolgarstroi, Balkanstroi, Valmex, and Holding Patishta.