Good photo but it's hard to see the text on buildings and vaults with photo 

The Decompose Vault (DCV) is used with the Decompose Toilet system. It is an open-bottom vault made of prefab fiberglass (FRP) materials. FRP is an extremely cost-effective solution for remote locations where concrete ingredients, mixing and pouring are challenging and laborious. 

Solid waste in the DCV is consumed by native soil invertebrates and bacteria. The open-bottom soil contact surface performs similarly to a conventional septic field where infiltrators or pipe places waste in contact with active and aerobic soil for treatment. An important distinction and advantage of the TTS toilet is that it is waterless, and there is virtually no effluent leaving the vault, whereas conventional septic systems discharge hundreds of liters of waste water per day to the soil.