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(c) To the extent feasible, based on site-specific factors, final grading shall be implemented pursuant to Section 17764 of this Article, as the site reaches final configuration. (d) The operator shall develop and implement quality control procedures to ensure that the final grading plan is constructed as designed and approved. (e) The operator shall design specific slope configurations and drainage methods depending upon local topography, climate, and postclosure land use. (f) The operator shall prepare calculations based on the final site configuration to determine anticipated differential settlement of the site during the postclosure maintenance period. The following measuring techniques shall be utilized to monitor settlement, but not be limited to: (1) installation of at least two permanent monuments, in accordance with Title 23, CCR, Subchapter 15, Section 2580 (d) ; (2) an aerial photographic survey of the entire permitted site upon completion of closure activities and every five years throughout the postclosure maintenance period. These aerial photographs shall be from a flight height above mean terrain to produce a map with a maximum contour interval of two feet (21 ) , a scale in accordance with Title 23, CCR, Subchapter 15, Section 2597 (b) , and with corresponding horizontal and vertical ground control points, or sufficient survey points to produce a map of equal scale. (A) A lesser frequency for the aerial photographic survey may be approved by the local enforcement agency and the Board, based on volume of waste and amount of settlement of the site. (3) Alternative techniques to determine differential settlement may be utilized to prepare required maps as approved by the local enforcement agency and the Board. (4) An iso-settlement map shall be produced showing the change in elevation from the map produced upon closure and the most recent topographic map with a maximum contour interval of two feet (21 ) . I NOTE: Authority cited: Section 40502 and 43020, Public Resources Code, and 66796. 22 (d) , Government Code. Reference: Sections 43021, Public Resources Code, and 66796. 22 (d) , Government Code. Section 17777 . Final Site Face (a) The operator shall ensure the integrity of final slopes under both static and dynamic conditions. The slope of those portions of the fill which will be the final exterior surface shall be developed in accordance with Section 17779 of this Article. Slopes shall not be steeper than a horizontal to vertical ratio of one and three quarters to one with a minimum of one fifteen-foot wide bench for every fifty feet of vertical height. Slopes steeper than a horizontal to vertical ratio of three to one shall be supported by a slope stability report. 111 7 . 8-19 (6/18/90)