HDD drilling under the Vistula River Expansion of the siding railway station in TP No. 74 in Ostrów Wielkopolski HDPE PKN Orlen SA in Płock Expansion of the existing plant repair rolling stock - implementation of stage II of the investment in Libiszów Construction of a reservoir park at OLPP Koluszki Łódź Chojnywater pumping station Construction of the MPS Depot for the F-16 Construction of the E75 Rail Baltica railway line Warsaw - Bialystok Construction of MPS-1 and MPS-2 Poznan Krzesiny Construction of the overhead line 110KV Koluszki - Brzeziny Modernization of the railway line Lodz - Warsaw Warsaw Metro Construction of the hallŁódź Agglomeration Railway Modernization of the railway line Warsaw - Lodz stage II Construction of the South Hospital in Warsaw Construction of the Track System Kozienice Power Plant with the SRK system and the power industry Construction of the Oil Terminal in Gdansk Construction of approach lights Rzeszów Jasionka Construction of the PTA installation in Włocławek CERTIFICATES