Hi,i have a question regarding water pump.?

i am driving a Renault Megane Cabriolet 2001,1.6,16V.Last week,i noticed a small patch of coolant leak on the floor.my mechanic says it could be a leak at the water pump.however,i had changed the water pump at 60000km servicing and my mileage now is only 30000km more.i had thought that water pumps should last more than 60000km,don't they?i noticed that the coolant leaked on the right side of the car whereas my coolant reservoir(overflow) is on the left side of the car.does this also points to a water pump leak?also,i noticed that there were no more coolant leaking on the floor since then but the level of coolant in the reservoir is slowing dropping.is there a way to tell for sure if it is indeed the water pump that is leaking as i have been trying to locate it but could not.should i look under the hood or under the car and how does it looks like?please help.thanks!