Was sitting the other day, and decided that new offices would be nice, so have started digging the foundations for a new pub, offices, patio, bathroom, workshop, shower, toilet, little kitchen, new bedroom, new boundry wall......i sit too much

anyway, am doing this myself (okay not like spade in hand..hired help)

The question is, during the excavation on the office side...discovered that there is a 150mm storm water drain which will go through/intersect the foundation in 3 places. During the dig on the bedroom side, discovered similar thing but sewage pipe....

How does a person protect these pipes in the foundation?

Anybody with a bit of knowledge in building?