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.J ' other materials not naturally occurring or commonly foruid in the earth in the mined area, unless tests :md mialyses on the materials mrd tlrc mctl~od of disposal Ir;rvc dcmonsti~ated, prior to l,crmit • approval or by pe rnrit amendment, that such deposition would not have mil. sib*nificmrt adverse or detrimental effect on ground water, surface water, soil stability, revegetation or oilier recla- mation requirements, or pose a threat of combustion. 7. 71re operator shall place spoil materials, stockpiles, :uid other materials resultirig from any aspect of mining or reelanultion operations in such a location mid manner as to protect all on- and off-site areas :Lid persons working on or off tlic site from slides or damage, including air or water pollution. 8. In all cases where a lake, pond or other body of still iaater is produced as a portion of the reclamation plan all slopes, un- less othenaise approved by the Board, shall he no steeper than a ratio of t~~o horizontal to one vertical, except from five feet above the expected water line to ten feet below the expected water line w}iere slopes shall be no steeper tl~mi tlirce Horizontal to one vcrtic:rl. If a swimming area is proposed as a portion of tlic t'cclmnation plan, the slope, carless othen~isc approved by the Board, stroll be no steeper than five horizontal to one vertical tlrrougfrout the area prolwsed for such swirruning use, mid a slope no steeper tlrarr three horizontal to one vertical elsewhere in the same body of water. 9. In the case of sand and gravel operations, the mining and recla- • motion plan shall, wherever possible, sclmrent the life of the operation into five year or shorter intervals. Extraction in each sebanent s1ra11 be completed and reclamation begun within five years after the initial permit is issued. C. Topsoiling. 1. All available topsoil shall be removed from areas of excavation within the affected area before removal of materials wrderlying the topsoil. Topsoil removal shall precede each step of the mining process. 'fhe operator shall indicate in the reclamation plan the equipment and procedures to be used in topsoil salvage and redistribution. 2. l'opsoil stockpiles shall lie located in areas where they will not lrc disturbed by on-goins mining operations, provided, however, such stockpile areas must be included in the affected areas and subject to all reclamation requirements. 3. The Board will require topsoil be replaced on the backfilled and graded area in a short enough time to prevent deterioration of the topsoil. In the event backfilling and grading is not possible within this time, the Board may require innediate planting of an u