WATER TERMS

term	description
UNILATERAL ADMINISTRATIVE ORDER(UAO)	A legally binding document issued by EPA directing the parties potentially responsible to perform site cleanups or studies (generally, EPA does not issue unilateral orders for site studies).
UNCLASSIFIED WATERS	Those waters for which no classification has been assigned and which have not been identified in Appendix A of 31 Texas Administrative Code, ¤307.10 of Title 31 (relating to definitions).
UNDERGROUND STORAGE TANK	Any one or combination of underground tanks and any connecting underground pipes used to contain an accumulation of regulated substances, the volume of which, including the volume of the connecting underground pipes, is 10 percent or more beneath the surface of the ground.

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