civil engineering and development works for the underground section of paris charles-de-gaulle of line 17 north of the grand paris express - consultation concerns civil engineering works and improvements to the underground section around and under paris charles-de-gaulle airport, including the paris charles-de-gaulle terminal 2 airport station, of line 17 north of the grand paris express, between the open trench of tremblay-en-france (included) and mesnil-amelot station (excluded). included in this procedure are civil engineering works (earthworks, tunnel, ancillary works, trenches, sanitation and other civil engineering works), exterior development works (vrd and landscape) and improvements to the station and technical works [closed covered surface works, finishing work, finishes, technical equipment including specific lifts at cdg t2 station, strong currents (cfo), heating, ventilation and air conditioning (hvac)