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Phase I Environmental Site Assessment (ESA) for 3,120.16 acres referred to as the Lower San Pedro River parcel in Pinal County, Arizona.

This regulation prescribes the guiding principles, policy, organization, responsibilities, and procedures for implementation of risk-informed dam safety program activities and a dam safety portfolio risk management process with the USACE.

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Materials that meet the criteria of Freedom of Information Act exemptions are not posted on this website. Culturally sensitive materials not posted here fall under this criteria.

In order to address specific matters included in comments on the DEIS, the TNF has requested more specific information pertaining to reasonably foreseeable HAPs emissions and, as applicable, associated potential health effects.

Aquifer testing at the Skunk Camp investigation area in Pinal and Gila Counties, Arizona.

Update of previous analysis of flood flow frequency and volume-duration-frequency values for points of interest on Queen Creek and Devil’s Canyon for the Skunk Camp tailings storage facility (TSF) location alternative.

The objective of this letter is to address WR-23 and describe and quantify (where possible) the embedded and adaptive contingencies incorporated into the Skunk Camp TSF design and to demonstrate the design robustness to the above uncertainties.