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1>ractical Approaches for EtIective E R S Control - 81 <br />For example, to install the straw blanket mentioned in the CM example, the <br />manufacturer requites two 6' x 1' x 6' A'11 gage wire staple be placed per <br />square yard to hold the blanket firmly to the ground. If the staples themselves <br />cost 5 .OS each, the an additional cost of S .10 per square yard (or 5484 per <br />acre) must be added to the material cosu. <br />Field Nore: The ntonber of fasteners for rolled materials varies bored on <br />material type, soil conditions, runoff volume and length and <br />steepness of slopes. <br />CI Installation Casts <br />Simply put, this variable accounts for the manpower necessary to apply an <br />erosion control technique or material. For the purpose of this discussion, it is <br />not the rnntractor installed price• which is generally ai least double the material <br />costs and has profit, overhead and other items built in. CI relates to the actual <br />installation cosu accreted during installation based on the number of manhours <br />necessary to complete the work. For example: <br />Two men can install four straw blankets in 1 hour. <br />• 4 blankets x 60 yds/blanket = 240 yds per hour <br />Hourly labor rate = 510.00/hour <br />Cl =Hourly labor cost(additive)/ yards per hour <br />= 520.00/240 yd per hr <br />= S .08 per sq yd <br />or = S .OI per sq ft <br />or =5403.33 per acre <br />Field Note: Installarion costs can vary signi, ficantly based on the type of <br />mechanical equipment being used and the number of laborers involved. For <br />example, where two men might install four blankets in one hour, four men might <br />be capable of installing ten blankeu in one hour. Ibis is because work patterns <br />which stage installations or divide up activities into specific functions, such as <br />stapling, rolling the material out, digging trenches, etc. increase the efficiency <br />of larger crews. <br />i <br />O 1995 IECA <br />