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There is no existing or required instrumentation. <br />(bl The desien_depth and elevation of anv impounded waters at the time of the initial certi[catlon report or <br />the average and maximum depths and elevations of anv impounded waters over the past veer for the annual <br />mrtification reports. <br />7 From Sedimentation Pond As-Built, 7-7-91, Rev. 1: the depth of impounded waters = 10 feet (from the <br />I bottom of the pond to the invert of the emergency spillway), elevation = 90'; the depth of impounded waters <br />= 9' feet (from the bottom of the pond to the crest of the principal spillway), elevation = 89'; the depth of <br />impounded waters = 4 feet (from the bottom of the pond to the invert of the lowest weep hole), elevation <br />= 84'. Based on quarterly inspection reports over the pazt year (3/25/94, 6/13/94, 9/30/94, and 7 November <br />1994), the average depth and elevation of impounded waters waz 0.1' and 83.1', and the maximum depth and <br />elevation was 0.2' and 83.2', respectively. <br />cl Eadsting storage capacity of the dam or embankment. <br />The etdsting (7 November 1994) storage capacity of the dam is estimated to be approximately 2.4 aae feet <br />[From the sediment level to the invert of the principal spillway (reference Sedimentation Pond As-built, Rev. <br />I, 5-30-91), and 4th Quarterly Inspection Repon]. <br />(dl Anv fires occurrine in the rnnstruction material up to the date of the initial certification or over the past <br />year [or the annual certification reports. <br />No fires were reported up to the date of the initial certification, and no indication of fires in the construction <br />materials of the dam was observed during the past year. <br />(e) Anv other ascect of the dam or embankment aRecting stability. <br />Burrowing by rodents (in conjunction with impounded water) has an adverse impact on the stability of the <br />dam. Compaction of the burrow on the dam has been recommended. <br />The lack of riprap for emergenry spillway flows on the downslope of the dam may present a potential adverse <br />effect on embankment stability. Placing of riprap on the downslope of the emergenry spillway has been <br />recommended (as good design). If current runoff from a 25-year, 24-hour storm event would not erode the <br />downstream slope, then this recommendation is withdrawn. <br />Mined Land Reclamation Division letter, July 13, 1984 <br />The basis for this section of this certification is Mined Land Reclamation Division letter, July 13, 1984, RE: <br />Professional Certification. <br />¢]. A statement of the professional aualificatlons of the certifying professional. <br />Mr. Walker was graduated from the Colorado School of Mines with a Professional Degree in Geological <br />Engineering in 1959, and from the Missouri School of Mines at Rolla with a Bachelor of Science Degree <br />' Equivalent in Civil Engineering in 1964 and a Master of Science Degree in Civil Engineering (major in Soils <br />Engineering) in 1966. His pertinent experience includes construction of drainages structures, impoupdments <br />Cor dredge spoils, and erosion control and wildlife water dams and ponds; teaching [earthwork (including <br />hydrology and drainage) design, methods of construction, constrvction management, and quality control <br />' (including soil material testing)]; review and management of design and construction of dredge spoil <br />Chimney Rock Mine Pond #004 Inspection Report & Certification, 18 November 1994, Page 3 of 6 <br />