The Navajo Nation covers over 27,000 square miles in Arizona, New Mexico, and Utah, and within those lands are approximately 100 sites containing underground storage tanks (USTs) and twenty-five sites containing aboveground storage tanks (ASTs). Most of these sites contain multiple tanks and, over the years, many of these tanks have leaked. Releases have occurred due to improper tank closures, faulty operation and maintenance practices, and other violations of storage tank requirements.
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