This permit is for discharges to lined surface impoundments, lined secondary containment structures, and associated lined conveyance systems at mining sites. Activities that prompt the need for this permit are: seepage from tailing impoundments, unleached rock piles, or process areas; process solution temporarily stored for short periods of time due to process upsets or rainfall; stormwater runoff not permitted under A.R.S. § 49- 245.01 because the facility does not receive solely stormwater or because the runoff is regulated but not considered stormwater under the Clean Water Act; wash water specific to sand and gravel operations not covered¹ . This permit is valid for five years.