Laserfiche WebLink
Exhibit D <br />clinker. This mixture is then ground to a very fine powder in a process known as finish milling. The <br />• product from the finish mill process is portland cement. <br />Most of the portland cement produced at the facility will be shipped out by railcar. Some of the annual <br />production will be shipped out by truck. The portland cement will be shipped to either distribution <br />terminals or directly to customers. <br />SURFACE WATER MANAGEMENT PLAN <br />Surface water will be managed prior to mining, during mining, and after reclamation using several <br />methods and temporary or permanent facilities. Exhibit D-3 provides an overview of the proposed storm <br />water, management facilities. A description of each facility is provided below and additional design <br />details are provided in Appendix F "Surface Water Management Plan." For the purpose of discussion, <br />these methods aze divided into ancillary mining, mining, and reclamation activities. <br />Ancillary Mining Activities <br />Ancillary mining activities requiring surface water management facilities include construction of the <br />access road, railroad spur, borrow area, and plant area.. Surface water management facilities have been <br />developed based on the following goals and objectives: <br />Protect critical transportation facilities. <br />Protect plant operation from storm water run-on. <br />• Control runoff from disturbed areas. <br />Manage process water. <br />Manage domestic wastewater. <br />Protect Critical Transportation Facilities <br />The access road and railroad spur are important to the operation of the cement manufacturing facility and <br />will be protected from major damages during a 100-year flood event. Culverts are provided where the <br />road and railroad crosses an existing arroyo or creates a sump condition with an embankment. Multiple <br />culverts are specified and are designed with low head (that is, headwater-to-depth ratio of 1.5 or less) to <br />minimize erosive velocities at the outlet. This approach also minimizes turbulence in the transitions into <br />and out of the culverts, because the broad, shallow flow of the natural arroyos is mimicked. Each culvert <br />will have either flared-end-sections or saddle headwalls to facilitate transitions. Erosion at the outlet will <br />be minimized by constructing rock-lined, pre-formed scour basins. Locations and details of the culverts <br />are provided in Appendix F. <br />Storm water runoff from the embankments will be collected in ditches located at the base of the <br />embankment and conveyed to the nearest arroyo culvert. The potential for ditch erosion will be controlled <br />by ditch-check structures (that is, small rock checks or geo-synthetic check dams with heights up to 2 <br />feet). Embankment slopes will be protected from erosion with vegetation. Steeper slopes will use either <br />geotextile wrap or geogrid reinforcement to protect the slope. <br />Protect the Plant Operation From Storm Water Run On <br />Protection of the cement manufacturing area will include the use of diversion ditches and an internal <br />• storm drainage system. <br />1180-Mine Permit Ezhihits (Ju1.03.02)FQdAL.doc l~_9 <br />July 3, 2002 <br />