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the reclaimed substation access road has been observed in previous inspections. No slope <br />stability problems have been noted during the Division's inspections. <br />Impoundments and Earthen Structures Remaining on the Site <br />There are no impoundments within the remaining Southfield Mine permit. As noted, a <br />portion of the Magpie Diversion remains within the permit boundary and approximates <br />0.35 acres. The design for the Magpie Diversion is in the permit application in Exhibit <br />19 and on Maps 25, 25A and 25B. The associated maps refer to diagrams and designs of <br />the diversion that is in Exhibit 19, and includes P.E. stamps. <br />The dimensions of the Magpie Diversion appear similar to those shown in Exhibit 19 and <br />the above mentioned maps. The diversion reports to an 8.8 foot diameter culvert which is <br />not part of the Southfield Mine. Monthly inspections have reported the culvert clear and <br />functional and the diversion dry in most months. The Magpie Diversion appears stable <br />and functioning as designed. <br />Risks to Public Health, Safety and Environment <br />A potential risk to public health, safety, and environment at the Southfield Mine would be <br />a worst-case scenario in which runoff during a high intensity and concentrated <br />precipitation event rapidly flows through the Magpie Diversion with water and causes <br />failure of the diversion, resulting in large erosional features to develop and carry <br />sediment offsite. The risk of this scenario occurring can be considered remote because <br />the diversion is designed to safely pass runoff from a 100 -year, 24-hour storm and is in a <br />functioning condition. Discharge from the Magpie Diversion and surface runoff from the <br />permit area would make its way to Newlin Creek and eventually to the Arkansas River. <br />The Southfield Mine is not located directly above any urbanized areas, communities, <br />occupied dwellings, schools, or other public or commercial buildings or facilities. <br />Sediment and Erosion Control Function <br />Most of the remaining area at the Southfield Mine is flat and stable. The majority of the <br />reclaimed areas are stabilized with vegetation. The light -use road which hasn't received <br />reclamation is flat, small in size, has shown no signs of erosion in previous inspections <br />and is becoming vegetated due to lack of use. <br />Estimate of Continuing Safety, Health or Environmental Problems <br />The Division believes that the safety, health, and environmental concerns at the <br />Southfield Mine are minimal and have been reduced to the extent possible. The site poses <br />no imminent threats to human safety or the environment and none are expected to <br />develop. Due to the remaining features of the mine, the site should be periodically <br />inspected to ensure that there is no off-site impact from sediment transport and for <br />monitoring the continuing function of the Magpie Diversion. <br />2 <br />