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• SUGGESTIONS FOR TEMPORARY EROSION AND <br />S1I.TATION CONTROL MEASURES <br />This booklet has been prepared to assist highway designers, construction field <br />personnel, and contractors by providing some ideas and suggestions far controlling erosion and <br />sediment pollution during highway construction. Many of the control measures are considered <br />temporary,~intended to serve during construction or until permanent controls are installed and <br />become effective. <br />Most of the features discussed and shown have been successfully employed on highway <br />construction projects. In some states, they have been incorporated into design plans and <br />specifications. State highway departments are encouraged to incorporate these temporary <br />features, along with other eroson and siltation control measures, into their designs. It is also <br />necessary to establish an adequate maintenance schedule of temporary controls during <br />construction. <br />Wheze temporary erosion control features aze not included in the plans, it is expected <br />that construction field personnel and contractors will anticipate possible problems and provide <br />• timely and adequate controls to prevent or at least ~*+inimiu adverse effects. <br />These ideas and suggestions should also be of value to contractors in developing <br />erosion control schedules as requ'ued on all federal aid projects. <br />The most effective erosion and siltation control that can be exezcised on any highway <br />construction project is early treatment of the slopes -both cut and fill. Early treatment means <br />treating cut slopes as excavation progresses and fill slopes as embartlrntent construction <br />proceeds. Slope treatment varies from state to state but generally consisu of mulchseeding, <br />and in some instances topsoil application. Stone blankets and other special treatments may <br />be needed in problem areas. The temporary control measures discussed and shown in this <br />booklet should ~ be considered in lieu of eazly slope treatment, but rather for use in <br />conjunction with early slope aeatment. <br />It is also presumed that proper excavation and embankment construction operations will <br />be performed including items such as: eazly installation of interceptor and toe of slop ditches, <br />adequate roadway crowning to allow lateral drainage in both cuts and fills, maintaining side <br />ditches in cut aeeas as a lower elevation than the main body of the cut, and proper <br />A-4 <br />