pompages de reprises d'assainissement

French to English Tech/Engineering Construction / Civil Engineering Water company projects

I am translating a newsletter from a water company. Among the list of works carried out is ' 5 pompages de reprises d´assainissement'. I know what all these words mean individually (pumping of recovered sewage?) but I would very much appreciate input from colleagues experienced in this area, as I am not sure about the translation.

For context other terms in the list are:
8000 regards et 30 800 branchements ;
8 réservoirs béton (de 200 à 2 000 m3) ;
8 chambres de vannes principales

my deadline is midday tomorrow Paris time.
many thanks
Sue