What to do with the electrical conduit and water pipe

I asked a landscaper to do landscaping in front of a sloping-back granny flat
When the landscaper dig down, he found that an electrical conduit and a water pipe were exposed.
He suggested to ask an electrician and a plumber to dig down 60cm and bury the electrical conduit and water pipes before he can put down concrete footing for the rock retaining wall.

One builder suggested to encase the electrical conduit and water pipes with concrete without digging 60cm down.
One plumber suggested to dig further up and down and then stretch the conduit a little bit and cover it with soils.

.The suggestions from the builder and the plumber work out much cheaper.

What's your thought?

Thanks.

 

How deep are the services at present? So they comply with code? If not, get the tradie back to bury them properly.

 

Bury it deeper with underground-mains-marker-tape (thick heavy duty plastic) on top to alert anyone digging there in future.
Repelec 100m x 150mm Underground Mains Marker Tape

 

Who dug the trench the sparkie and plumber used ? I suspect nobody mentioned the landscaping so the trench was 600m from surface but isnt now. This may be your cost to rectify if the tradies werent told you planned to excavate the yard. Did you give them approved plans including the retaining wall and site excavation on them, if not it may be non-compliant and all your issue to resolve. That retaining wall engineered for the building beside it ?

 

Seems when planning the wall you and landscaper didnt allow for service pipes.

Probably best to build a dry rock wall ( no concrete/cement needed) now. That way if you need to access pipes later you can easily move a few rocks. Keep under 900ml so council wont care.