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ā¯‘ASPHALT MANUFACTURING <br />A hot -mix asphalt plant blends together aggregate and asphalt cement to produce a <br />hot, homogeneous asphalt paving mixture which is then hauled to off-site construction <br />projects. The aggregate used can be a single material, such as a crusher run <br />aggregate or a pit run material, or it can be a combination of coarse and fine <br />aggregates, with or without mineral filler. The binder material used is normally asphalt <br />cement but can also be an asphalt emulsion or one of a variety of modified materials. <br />Various additives, including liquid and powdered materials, can also be incorporated <br />into the mixture. <br />Activities at these sites may inciude the following: raw material unfoad:ng into <br />stockpiles or storage tanks, raw material feed to plant, material batching, raw material <br />storage area, recyclable asphalt disposal area, truck wash out, and water supply and <br />settling lakes. <br />DREADY MIXED CONCRETE <br />These operations mix sand, gravel, cement, and water together to form ready mix <br />concrete, which is hauled to off-site construction projects. <br />Ready Mixed concrete is produced at these locations by combining raw materials in <br />a mixer, which can be stationary (central mix plant) or truck mounted. The raw <br />materials are made up of sand, gravel, cement, water and additives. The sand and <br />gravel is either stored in stockpiles located outside and fed into the plant via loader <br />and conveyors, or it is directly stored in a series of hoppers located directly above the <br />central plant. The remainder of the raw materials are stored in tanks to protect them <br />from exposure to moisture and temperature until they are pumped into the mixer. <br />Once the raw materials are fed into the mixer and combined to form ready mix <br />concrete, the final product is removed from the site by truck. <br />Dry Batching is apportioning out and dumping the mix into the concrete truck or mixer <br />while the cement truck continues to agitate at a lower speed to keep it from hardening <br />before it arrives at the site. <br />Activities at these sites may include the following: raw materia! unloading into <br />stockpiles or storage tanks, raw material feed to plant, material batching, raw material <br />storage area, recyclable concrete disposal area, truck wash out, and water supply and <br />settling lakes. <br />iEQUIPMENT FUELING <br />Diesel and/or gasoline tanks are located on site for fueling of equipment. Off-site <br />vendors refill tanks as needed. <br />WestWater Engineering <br />APPENDIX C - 57 July 2012 <br />