We were excavating for a concrete storage facility 115′ in diameter, 14′ in depth. The total excavation included approximately 8000 cubic yards of dirt, with a quarter of the excavation being rock. This job was made challenging because of the amount of water encountered during excavation was estimated at 86,000 gallons per day. The rock was removed using an excavator with a hammer. The portion of the bottom that was not rock had become mud. A point drain tile was installed to lower the water table to a suitable level.