Sparkync,
You can rent locating equipment from some rental stores or hire a locater (probably a better idea) to come to the job site. Since you now have a fishtape in the conduit, connect the transmitter to the fishtape or place the inductive probe around the fishtape and you should be able to easily find the route of the conduit and mark the ground with upside down paint can. Compared to digging up the shrubbery and all that, locate services are very cheap, and also make you look like a professional looking out for the best interests of your client.
