Text: the gateway site is the starting point for several walking- and bicycle paths, and nearby there is a brand new mountain bike track.

Correct capitalization: The Gateway site is the starting point for several walking- and bicycle paths, and nearby there is a brand new mountain bike track.

Text: "it's mainly slurry handling.

Correct capitalization: "It's mainly slurry handling.

Text: that a system of masses contains energy is thus identical to saying that it consists of unitons with kinetic energy.

Correct capitalization: That a system of masses contains energy is thus identical to saying that it consists of unitons with kinetic energy.

Text: in addition to being a violation of their human rights and discrimination, marginalization of people with disabilities and support their dependence on others are expensive, as for their families, and society as a whole.

Correct capitalization:
In addition to being a violation of their human rights and discrimination, marginalization of people with disabilities and support their dependence on others are expensive, as for their families, and society as a whole.