You can install a Curb Stop and Waste valve that will be operated from above the ground. http://www.gjpipe.com/curb_stops.htm...OP%20&%20WASTE
There is a risk of contamination from water entering the waste hole. The valve is uinstalled with the waste hole on the house side of the pipe.
The valve will be operated with a curb key, or you could attach a rod permanently.