Laserfiche WebLink
' Wildlife Resources Assessment <br />Cemex "C" Pit and CKD Disposal Site <br />Page 4 <br />' Wetlands: located throughout the analysis area. Other than sites associated with the St. <br />Vrain Creek floodplain, most wetlands are the result of human activity including linear <br />' wetlands along leaking irrigation ditches and around pond fringes. Wetland vegetation <br />includes areas dominated by tall herbaceous species such as cattails (Typha sp.) and other <br />areas dominated by graminoid vegetation such as rushes (Juncus balticus and Eleocharis <br />palustris) and sedges (Carex sp.). <br />Aquatic: this cover type is represented by St. Vrain Creek, the Boulder Feeder Canal <br />(Photo Points 6 and 11), Swede Ditch, and ponds scattered throughout the analysis area, <br />' including "A" Pit (Figure 3 and Photo Points 3-5). <br />High Wall: this habitat is represented by mine high walls in the remaining open portion <br />of "C" Pit (Photo Point 1), and as a part of final reclamation, such as at "A" Pit (Photo <br />Points 3-5). This habitat is generally devoid of vegetation and is included here as a cover <br />type and potential wildlife habitat. <br />Disturbed Sites: located around the cement plant, along roadsides (Photo Point 11), and <br />around "C" Pit. Some areas are dominated by early succession weeds, and other sites <br />have grasses and herbaceous vegetation similar to the Tame Pasture and Reclamation <br />' communities. <br />' 3.4 CKD Disposal <br />Cement kiln dust (CKD) is generated as a by product of the cement manufacturing <br />process. The amount of CKD produced by the plant varies, based in part upon market <br />demand for particular cement types and the availability of viable recycling alternatives. <br />Excess CKD is disposed of on-site in the remaining open portion of "C" Pit (Figure 3). <br />CKD disposal in "C" Pit is allowed under Permit M 77 208. The exposed portion of the <br />dust in the pit is sprayed with water several times per day in order to minimize wind <br />' blown dispersal. CKD disposal has been practiced in "C" Pit since 1995 when the Dowe <br />Flats Quarry came into production, and most of the Lyons Quarry was closed and <br />reclaimed. Previously, CKD was disposed in "B" pit to the southwest. This pit has been <br />closed and capped. CKD disposal practices are reviewed in Banks and Gesso (1999). <br />When CKD disposal began in C pit there was a small amount of water in the bottom of <br />the pit, generally well under one acre foot. In recent years additional water has <br />1 accumulated in the bottom of the pit, and water volume has expanded up to 100 acre feet. <br />This water is in contact with the disposed CKD, resulting in the water in the bottom of <br />the pit having a PH of approximately 12, which is hazardous to any wildlife that comes <br />into contact with this water. <br />i <br /> <br /> <br /> <br /> <br />