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Operation: Riverside Pit <br />Permit #: M- 1979 -056 <br />Date: April 25, 2012 <br />Technical Revision - TO INCLUDE THE MINOR USE OF EXPLOSIVES AT THE RIVERSIDE PIT <br />McAtee Construction Company is making this Technical Revision to <br />include the use of explosives at the Riverside Pit as part of the mining and <br />Reclamation Plans. The explosives will not be used to extract material only <br />to relieve unsafe conditions caused by the method of mining used at the site. <br />During dredging the operator pipes the sand slurry back into the pond and an <br />overhang is created. This leaves an unsafe condition where there is the <br />potential for personnel or equipment to enter the overhang area and cause it <br />to slough off carrying them into the water and burying them. <br />To alleviate this problem a light charge is set off to drop the <br />overhang to the natural angle of repose. <br />McAtee Construction Company mines and stockpiles 2 to 4 years of <br />material during an operations period. The practice of using explosives to <br />stabilize the slope created by the rejected sand slurry is their standard <br />practice on any mine where they operate. Under normal conditions a charge <br />will be set off once to twice during a mining period and that will occur <br />every 2 to 4 years depending on the demand for material. <br />The method used will involve hiring a registered blasting contractor to <br />determine the size of the charge needed to stabilized the rejected sand slope <br />(usually a quarter ( 1 A) stick of dynamite). The method for placing the charge <br />is to push the dynamite into the sand several yards from the water's edge and <br />to detonate the charge. The blasting contractor will supply the blasting <br />agent and will be responsible for safety during a blasting event. No <br />explosives will be stored on the site. <br />McAtee Construction CO. will maintain information on each blasting <br />event at the mine and make it available upon request. The information will <br />contain the date, time, charge size and blasting material type used. A copy <br />of the explosives license and name of the contractor's personnel responsible <br />for detonation of the charge will be kept also. <br />