Laserfiche WebLink
<br />characteristics. Prior to contour furrow construction, the slope contours should be <br />staked by a hand level or instrument survey to aid the operator in placement on the <br />contour. Care should be taken to avoid furrowing off contour. Interrupting the contour <br />on a periodic basis helps to minimize breaching and erosion problems associated with <br />contour furrows that are placed off level. <br />2.1.2.3 Land Imprinting <br />Land imprinting is accomplished using a roller with any number of various geometric <br />configurations. Normally the geometric pattern is repeated around the imprinter's <br />drum, with two or three shapes being repeated in anon-linear or alternating fashion. <br />The shapes used should promote their penetration and imprinting into the soil surface. <br />Imprinting may be used on any slope where equipment can be operated. Because of its <br />non-linear pattern imprinting is especially useful on steep slopes where equipment <br />can't be operated on the contour. Imprinting works best on medium-textured soils. <br />Soils that are too sandy do not imprint well because they fail to retain the imprinter's <br />shapes; soils that are high in clay content may present problems with adequate <br />penetration. <br />2.1.2.4 Erosion Control Fabrics and Blankets <br />Erosion control fabrics may be used on slopes where erosion potential is moderate to <br />high and where the application of mulch materials is either not physically possible or is <br />not expected to adequately protect the slope during the vegetation establishment <br />period. Erosion control fabrics may be installed perpendicular to or vertically on the <br />slope (Figure C-1). Fabrics should be installed per the manufacturers' specifications. <br />Properly installed and maintained blankets are extremely effective in stabilizing soil <br />and promoting vegetation germination and establishment. Their relatively high cost <br />requires that they be used judiciously. <br />2.1.2.5 Wattling <br />Wattles are typically used for freshly disturbed slopes or as a reclamation measure for <br />seriously eroded and barren slopes. Historically, wattling involves the embedding of <br />tree or shrub branches into the soil surface (Figure C-2 and Figure C-3). The woody <br />material is tied into bundles and placed on the contour. Wattling is normally used on <br />wetter sites, such as ephemeral or intermittent draws, where the woody materials have <br />an opportunity to take root and grow. While this project location likely provides <br />limited opportunities for employing classic wattling, it may be valuable as a <br />stabilization tool in some areas. The method is expected to be successful because it uses <br />mechanical and vegetative means to promote stabilization. Therefore, it should have <br />good applicability on steep slope areas that are difficult to access with machinery. In <br />those situations excelsior erosion control blankets may be rolled width-wise to serve as <br />wattling materials. The 40-foot-long to 80-foot-long roll of blanket may be cut to <br />I'reliminarv Response Plan A-10 <br />Yankee Gulch Sodium Minerals Protect <br />American Soda, L.L.P. <br />