Garden hose is not going to lift gravel!
Dig about a 20 cu ft pit, say 2.5 x 3 x2' deep about 10 ft from your hole, with a lead in trench from the hole to the pit, fill pit with water, Get a 5 - 6 hp mud pump and put the suction in a bucket submerged in the pit water (so the mud and gravel flowing up from the hole will be in the pit bottom & pump will be pulling from the water flowing over the bucket top)
Use at least 1" , preferably 1.25 or 1.5" id rigid pipe (pvc will work) from the pump discharge down the hole , some metal teeth on the bottom and an adj. Twisting handle at the top will help a lot! Add sections as you go but wait a minute or so at end of each section for the mud/gravel to flow up and out - Don't leave the pipe in the hole for long if not pumping!!!
In most east coastal areas with no rock, bolders etc you can do well unless you hit roots or any kind of rock or maybe marine clay.
Good luck!
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