Laserfiche WebLink
In order to gain an understanding of the extent of the existing mined area and reclamation <br /> disturbances, it is helpful to know the acres disturbed by different aspects of the operation. Each <br /> aspect is listed in the following table with associated disturbed area. The table illustrates the <br /> current conditions, which represents the maximum mining disturbance. Since the final land use <br /> includes water storage, a slurry wall or other form of liner needs to be constructed. For disturbed <br /> area estimates, it is assumed that the existing excavation depth (bottom of lake to top of adjacent <br /> land surface) is 25 feet. Although backfilling for reclamation has been primarily completed, <br /> construction of the slurry wall has not begun. <br /> Disturbed <br /> Aspect Mining Operation Area <br /> (acres) <br /> A Regrading and rough grading pond side slopes for added 24.3 <br /> stability at 3H:1 V— 13,400 feet x 79 feet <br /> B Slurry Wall construction; 13,300 feet x 75 feet 22.9 <br /> C Flood Protection Measures; 900' x 79' (same area as Aspect A) NA <br /> D Miscellaneous disturbed areas 5.0 <br /> Total Disturbed Area 52.2 <br /> Diversions and Impoundments <br /> Roads, irrigation ditches, trails, and a railroad grade will effectively minimize stormwater <br /> surface run-on to the site, so run-on diversion structures are not anticipated. To manage <br /> stormwater run-off, stormwater that falls directly on the affected area will be contained in the <br /> existing pit lakes. The pit lakes will effectively contain stormwater flows and prevent surface <br /> runoff from the site. <br /> Material Processing and Associated Facilities <br /> Excavated material will primarily be used on-site for reclamation. The material will either be <br /> used directly or, if necessary, temporarily stockpiled for later use, crushing, or screening prior to <br /> use. A scale house/employee/storage trail will be established near the site entrance in case <br /> material needs to be hauled off-site. If necessary, a fueling/lubricating station and/or generators <br /> may also be located near the scale houses. <br /> Commodities to be Mined and Intended Use <br /> Construction materials, primarily sand and gravel, are the commodities to be mined from the <br /> proposed permit area. <br /> Use of Explosives <br /> Since the material is unconsolidated alluvium, no explosives or blasting is required. <br /> Lamb Lakes <br /> DBMS/12 Permit Application Page 7 <br />