Laserfiche WebLink
• 2) Regarding of contour furrows to provide continuous grade for runoff control with <br />suitable mobil equipment to hold grade. Grade and alignment stakes will be supplied <br />for equipment operators. <br />3) Contour furrows will be designed as temporary structures based on the 10-year 24- <br />hour event. A V-ditch cross section is anticipated. <br />4) To limit runoff area and water velocities on reclaimed slopes, cross channels or <br />furrows will be constructed, at slight gradients, draining to the existing improved <br />channels. Cross channels will be constructed on approximate 50 foot centers or as <br />required by the topography. <br />5) Nondestructive velocity control devices such as silt fences, straw bales, etc., will be <br />used as required to maintain furrow stability. It is also the intent to use these control <br />devices to silt in the contour furrows as vegetation cover increases and side slopes <br />stabilize. This silting in of the furrows will eventually eliminate them. Need for these <br />controls will be based on the results of the long term monitoring program. <br />6) If additional measures are required to maintain contour furrow stability, consideration <br />will be given to the use of improved channels beyond the existing channels. The <br />appropriate technical revisions for these improved channels will then be filed before <br />construction begins. <br />• 7) Technical revisions for the existing northeast and southeast improved channels will <br />be submitted after the acceptance of the rill and gully plan. If riprap is elected to <br />stabilize improved channels, an alternate source acceptable to the CMLRD will be <br />located. <br />8) Repair existing rills and gullies: <br />• Using clean fill material to fill rills and gullies. <br />• Using topsoil as top dressing from stockpile areas. The appropriate request will <br />be filed with the CMLRD before topsoil is removed from stockpile areas. <br />• Working only as ground and weather conditions permit, generally in the fall to <br />allow reseeding of the graded area immediately. If an unusually large <br />precipitation event creates excessive rills and gullies steps will be taken to <br />minimize additional erosion damage until the area can be repaired. <br />• Minimizing disturbance to adjacent reclaimed areas. <br />• Reseeding the repaired area and applying heavy mulch or other suitable erosion <br />control devices, if the mulch does not provide stabilization for the seed to <br />• 2.05-14 <br />