. The specifying engineer is responsible for the overall stability of slopes as indicated in Chapter 7. Provide reinforcement when the resistance factor (1/factor of safety) for the unreinforced slope is less than the required value. RSS is the method of stabilizing existing slope using internally stabilized fill slopes constructed with alternate layers of compacted soil and extensible reinforcement. If using RSS, the uphill slope may not be steeper than 1.5H:1V. Place reinforcing layers at a vertical distance of 3 feet or less. Ensure there is enough space and no interruptions for laying reinforcement. .Determine reinforcement length based on the evaluation of full range of potential failure surface, including deep seated failure surface. Soil strengths used in the design are determined from soil borings and correlation with Standard Penetration Test values. Typically, RSS requires smaller equipment as compared to retaining wall systems, however temporary special shoring may be required depending on the slope and site condition. Consider benching during excavation and placement of fill materials. Type of materials used in backfill has an important role on the stability of the RSS.