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The lay-down area near TS-1 was not included in any of the original <br />• sedimentation calculations. The lay-down area near TS-1 has been <br />fully reseeded and is covered fully in a thick stand of a western <br />wheatgrass mixture. The boundaries of the area are defined with <br />ditches/berets to separate the disturbed area runoff from the <br />undisturbed runoff. The runoff is directed to the low point of the <br />area where it is stilled in a semi-incised basin. No outflow <br />structures were constructed in conjunction with this area. Based on <br />the flows and sediment load modelled in the SEDCAD demonstration a <br />porous rock outflow structure will be built at the low point of the <br />area to keep from forming an impoundment and to still allow for <br />some retention time and filtering of the discharge. <br />Therefore to control the sediment from the lay-down area the <br />following measure will be taken: <br /> <br />1. The Lay-down area will be encircled with a berm to separate the <br />pile runoff from the undisturbed area runoff. <br />2. The berm will be breached at its low point to prevent an <br />impoundment from being formed, and a 5 foot porous rock outlet <br />structure will be constructed in the breach to provide some <br />retention and filtering as the flow works its way through the <br />outlet structure. The rock outlet structures will be inspected <br />periodically to ensure that they are in good repair and are not <br />clogged with sediment. The discharge of these structures will be <br />sampled and tested whenever a 10 ten year event is suspected. <br /> <br />