Replaced water pump and gasket and replaced.

Replaced water pump and gasket and replaced timing chain gasket due to water leaks. Pressure cleaned engine and noted no leaks. Drove car for 40-50 miles, the engine was at operating temp and noticed no leaks. Car sat for several hours (all night) and a puddle (size of a small glass of water) is under the engine. The gaskets are dry, the water pump is dry and no leaks from the weep hole. I checked all components and hoses and cannot find any trace of where this may be coming from. Any ideas? This does not happen every time, but enough to concern me.