English to Slovenian Tech/Engineering Law (general) agriculture environmental

Pozdravljeni,

muči me izraz "settlement and treatment facilities" v spodnjem kontekstu:

all facilities with which the surface water drainage system is equipped to avoid pollution, including oil interceptors silt traps and SUD system attenuation, settlement and treatment facilities, must be maintained in good order and repair; and

... mogoče objekti za obdelavo?

Prosim za nasvet.

Hvala in lp,
Nava Vardjan