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conveyed via pipes or other acceptable conveyance to the toe of slope . The spacing of collection points shall be no greater than 1 , 500 feet . Each reclaimed final slope face that has terracing shall have a minimum of one ( 1 ) down drain . The method of transporting the water along the flow line of the terrace to the down drain , so as to prevent erosion and possible slope failure , shall be approved by the Development Services Division . The method of drainage of terraces for temporary slopes at setback lines shall be submitted to Development Services Division for approval . ( 3 ) Slope Stability Factors of Safety . When required in this Title to provide site -specific geologic and engineering slope stability analysis , the following minimum slope stability factors of safety shall apply : A . A minimum factor of safety of 1 . 5 against static deep seated failure . Be A minimum factor of safety of 1 . 5 against static surficial failure . C . A minimum factor of safety of 1 . 1 against seismic failure . (4 ) Temporary Cut Slopes at Setback Lines . Temporary cut slopes ( i . e . , for limited periods of time , slopes that are in the process of extraction prior to being backfilled ) at setback lines shall not exceed one ( 1 ) foot horizontal to one ( 1 ) foot vertical , except that temporary cut slopes at setback lines to a maximum of one half ( 1 /2 ) of a foot horizontal to one ( 1 ) foot vertical may be maintained if site - specific geologic and engineering analysis demonstrate through a slope stability analysis that the proposed temporary cut slopes will have a minimum slope stability factor of safety as required in Section 9 - 1415 . 3 ( k) ( 4) . However , in the event that there are existing structures on the adjacent property ( or the immediate potential for structures on the adjacent property) , the excavation shall at no time be closer to the property line than a line projected on a slope of one ( 1 ) to one ( 1 ) from the property line to the toe of slope . ( 5 ) Final Slopes . Final cut and/or fill slopes shall not exceed two ( 2 ) feet horizontal to one ( 1 ) foot vertical , except as specified below : A . Final slopes to a maximum of one and one - half ( 1 1/2) feet horizontal to one ( 1 ) foot vertical may be maintained when site - specific geologic and engineering analysis demonstrate through a slope stability analysis that the proposed final slopes will have a minimum slope stability factor of safety as required in Section 9 - 1415 . 2 ( k) ( 4) , while demonstrating suitability for the proposed end use and protecting against erosion ( by means of revegetation or other methods approved by Development Services Division ) . ( 6 ) Fill Slopes . Fill slopes shall be constructed consistent with recommendations from a qualified civil/geotechnical engineer based upon site - specific geologic conditions . n . FENCING : Fencing four ( 4 ) feet in height consisting of not less than three ( 3 ) strands of barbed wire , or an approved equivalent , shall be placed around the excavation area where slopes steeper than two ( 2 ) feet horizontal to one ( 1 ) foot vertical are maintained . Six ( 6 ) foot high security fencing or an approved equivalent shall be required where slopes steeper than two (2 ) feet horizontal to one ( 1 ) foot vertical are created , if the proximity of such slopes to residential uses or other uses involving a concentration of people so warrants . ( Development Title Section 9 - 1415 . 3 [ 1] ) o . PONDING : All water utilized in the plant operation shall be disposed of behind a closed dike . ( Development Title Section 9 - 1415 . 3 [ n ] ) p . EXCAVATION / RECLAMATION SCHEDULE : The reclamation plan shall show the phases of excavation . Reclamation on one phase of an excavation shall be initiated prior to the start of the next excavation phase . The final reclamation of any phase of excavation shall be completed within PA- 0200182 — Conditions of Approval 3