"[The] Bureau of Reclamation undertook a preliminary reconnaissance study...to determine whether adverse impacts on the Rio Grande and Elephant Butte Reservoir could justify development of a sediment control project on the Rio Puerco, and to determine whether the Rio Puerco is transporting trace metals and radionuclides into the Rio Grande in quantities that might pose risks to humans or ecosystems downstream. The findings of this...investigation are detailed in [this] report"--Page 1.