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Memo to PCPC <br /> Re: SUP No. 1999-002 <br /> June 9, 1999 <br /> Page 13 <br /> Blasting will be conducted by a federally and State licensed professional blaster. <br /> The expected blasting agent will be a mixture of ammonium nitrate and fuel oil <br /> (ANFO) and a high explosive booster agent. This material will be transported to <br /> the site as blasting is required. No explosives will be stored on site. <br /> The Blasting Plan must be approved by the Mined Land Reclamation Board's <br /> Division of Minerals and Geology prior to initiating such activity on site. <br /> Erosion Protection and Sedimentation Control <br /> Storm water will be diverted from the active quarry areas via diversion channels <br /> maintained at the perimeter of the production panels. Silt fences, constructed of <br /> small hay bales or an equivalent material, will be applied in those areas where <br /> storm water may run off roadways or other bare soil locations. Runoff will be <br /> diverted to an impoundment to allow for settlement and then discharged to the <br /> St. Charles River drainage. <br /> The high walls at the northern edge and the sides of the earthen incline will be <br /> permanently stabilized with slopes not exceeding 70% for rock and 30% or less <br /> for soils. Final high walls will be sloped 3:1 and stabilized to prevent erosion <br /> using a geo-textile material containing the prescribed seed mixture. It is <br /> proposed that the impoundment of surface water be contained in the <br /> northwestern most corner of the initial box cut. The impoundment will be <br /> designed to contain all the runoff anticipated from a 100-year rainfall event. The <br /> impoundment will migrate with the mining as it moves to the south. Water within <br /> the impoundment could be used for dust control when available. <br /> Dust Suppression Methods and Controls <br /> Mining activities and quarry haul roads will be the sources of fugitive dust <br /> emissions. It is anticipated that in the active mining and haul areas a water <br /> application of 0.03 inches per day will be required to suppress dust. Water <br /> sprays will also be used at the crusher hopper and the conveyor system from the <br /> crusher to the plant site. <br /> Dust suppression in the plant area will involve sweeping and washing in the <br /> paved areas. Raw materials and intermediate and final products will be stored in <br /> enclosed within structures or containment vessels. The various processes within <br /> the plant area generating dust will be equipped with dust-collection equipment. <br />