Teeing in mains to feed a tea cabin.

[Gary80gas]

Ive been asked to run a mains feed to feed a tea cabin in a courtyard behind a shop. Its on land being leased from the shop which has the mains water supply. They want me to tee into their supply underground and run the new pipe to the new tea cabin. It will involve digging a trench across a 3m wide right of way tarmac access road to a house, packed gravel and soil either side.
The existing mains supply is about 450 deep. What would be the minimum allowable depth for my supply trench for this purpose. Im thinking the trench only needs to be wide enough to pick down to a suitable depth. If I dug a trench just wide enough to get the pipework down 200mm? Please help, im not sure where to begin.

 

[joni os]

750mm depth required, no matter what others have done. Establish position of other utilities and pipe runs. Tarmac, 3 metre wide, can in most cases be thrust bored to avoid disturbance and making good. Provided trench 3 metres long can be dug one side, thrust bore can be simple as scaffold tubes and 14lb hammer.

 

[newcastle phill]

As above 750mm. Youll be pleased when you dont a get call back for a burst pipe in freezing weather

 

[Riley]

And no deeper than 1350

 

[Gary80gas]

Thinking about passing this one over to the water board. Thanks again.

 

[PhoenixServices]

Just get a ground worker to dig the trench to your spec, then do your pipework.

 

[REDSAW]

just give them a U.s.p tell them to use spring water in a 50gall tank in roof topped up once a week.
spring water tea @ 50p a cup more lol