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spacing to minimize ground vibration, loading densities and shot patterns on file <br />for each event, seismic recordings(minimum 2 per shot) showing peak velocity of <br />ground vibration and air blast levels for each shot. This Blast Monitoring Report <br />will be attached to annual report to RMS as condition of permit. <br />d) Please find attached letter from Rod Schuch, blasting specialist with Buckley <br />Powder, a major supplier of explosives and blasting control technical support for <br />the Rocky Mountain region. Mr. Schuch has reviewed the site parameters and has <br />commented on the typical ground vibration level to be expected at this site. <br />9. Mine bench surface average slope measure will be 1% or less with exposed <br />bench faces as near vertical as possible for efficient blasting. Mining face length <br />may total up to 800' at maximum pit development including working face and <br />limbs of pit wall development. Access to top of mining bench elevation will be <br />restricted by fence, berm, rock placement or combination to keep unauthorized <br />personnel from vertical mining faces. <br />10. Specifications and Design of Sediment Control Berm. <br />The Sediment Control berm will be constructed with local soil from as close a <br />proximity to the site as possible. Any disturbance due to soil movement will be <br />re-graded and re-vegetated at the completion of structure. Soil material found <br />along the drainage way has ample fines content for adequate compaction via <br />repeated blade passes with bulldozer or motor grader. The intent of the sediment <br />berm is not so much to impound water as to slow down surface flow velocities in <br />the area where the haul road runs along lower portion of the drainage channel in <br />the southwest comer of the site. A shallow basin no deeper than 18" will be left <br />behind a broad spillway no less than ten feet each side the channel centerline and <br />no less than seven feet spillway width which will be armored using Pyramat, an <br />erosion control product commonly used for storm channel applications. In this <br />case, the product will be used for creating a shallow spillway effect that will allow <br />storm flow velocities to slow and deposit sediment in the shallow basin behind the <br />berm face. The pyramat product is a poly-woven fabric app. I" thick with small <br />cells woven into the fabric. The material is installed using steel pins and anchor <br />trenching techniques over soil smoothed via raking and removal of any rocks at <br />the surface. Once the pyramat is in place, seed is distributed over the pyramat <br />followed by one-half inch of soil to cover the fabric. The pyramat system offers <br />both a substantial physical armoring (50 year UV resistance) as well as promoting <br />the establishment of grasses over the fabric with root penetration through the <br />fabric and into the soils directly below. This system will stabilize the storm <br />channel against erosion of the berm due to intense storm events. If channel <br />stabilization efforts are not successful in establishing and maintaining a grass <br />cover over the bottom and sides as well as the spillway zone, rhyolite rock up to <br />six inches in diameter will be placed in the flow path to slow surface flow <br />velocity during an intense or prolonged precipitation event. Due to the shallow <br />nature of the structure, there will be very little water collected behind the berm <br />and what small amount may be found in the basin after a storm event will <br />percolate into the ground within twenty-four hours. The structure is intended to <br />slow surface run-off during intense weather events and retain sediment that may