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5. CKD Disposal Plan <br />Cement kiln dust produced at the Portland plant is amended with water and mixed by a pug mill adjacent to the <br />kiln, whereupon it is loaded into 20-ton trucks for transport via a short reach of Highway 120 to the quarry area <br />for disposal. The plant site pug mill area is a controlled azea protected from run on/runoff. Releases that may <br />occur during the loading process aze contained and cleaned up as they occur, as part of overall plant site <br />housekeeping. The CKD disposal areas are previously mined out areas which have subsequently been prepazed <br />for disposal by placement of an approximately eight- to ten-foot thick layer of overburden. This overburden <br />layer is compacted by mine equipment prior to CKD placement, and serves to protect the CKD from direct <br />interaction with groundwater in the underlying sandstone aquifer. <br />The CKD is then deposited at the disposal area in a layer (i.e., lift) that is approximately twelve feet thick. <br />Within twenty four hours after placement of the CKD into the disposal azea, it is covered by an approximately <br />ten-foot thick layer of crushed overburden material. Placement of this overburden cover layer reduces the <br />amount of time that the CKD is directly exposed to wind and precipitation. <br />Approximately 5 to 13 truckloads of CKD are produced and disposed of per day, depending on variable plant <br />operational parameters. <br />The currently available area for CKD disposal is approximately 22 acres in size, as shovm in Figure 2. Past <br />CKD disposal areas are also indicated on this figure. Placement of two lifts of CKD is planned for the future <br />disposal area, providing a CKD disposal capacity of approximately 23 million cubic feet. Assuming the upper <br />limit of the current range of CKD production capacity (72,000 tpy) at a density ranging from 75 to SO Ib/ft', the <br />currently available CKD disposal area has a minimum lifetime capacity conservatively estimated at <br />approximately twelve (12) years. <br />BLASLAND, BOUCK 8. LEE, INC. <br />12/13ro2 en gineels & scien}ISCs 5-1 <br />Govdwa[v Monitviug Plan 11 doc <br />englneef5 b sClennsis 6-1 <br />