2001-12-17_REPORT - M1983067 (13)

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Banks and Gesso, LLC Water Information Stormwater from all areas of surface disturbance will be directed toward the mine's dewatering systems by grading and shallow ditches. After the water is clarified and the sediments collected, the water will be discharged to the South Platte River. A CDPS permit has been obtained by the Applicant (No. CO- 0038512) and can be found in Appendix 3. Aggregate processing water will be separate from the de-watering and storm water systems. Wdh evaporation and product moisture losses, there should be no need to discharge processing water. Moreover, some de-watering discharges will be diverted back to the processing water system. The tailings pond at the southern end of the property will be maintained below existing grades so that any precipitation will be retained in this area. The initial mining the first year will leave a minimum setback of 200 feet from the river's top of bank to allow for the construction of the slurry wall. After the slurry wall is constructed, mining will be at a near vertical slope. The nearest major watercourse is the South Platte River, which flows along the western edge of the permit boundary. Final discharge from de-watering of the permit site will be made to the South Platte River. Soils Information The soils found onsite consist of Dacono Loam, Loamy Alluvial Land, Nunn Loam, Terrace Escarpments and Vona Sand Loam. Generally, all these soils are well drained and are commonly found on level terraces along the South Platte River. Soils information was obtained from the Soil Survey of Adams County, published by the USDA, Soil Conservation Service. The site is also within the West Adams Soils conservation District and County Mineral Resource Conservation District. Dacono Loam This soil has 5 to 15 percent gravel in the sand and gravel layer between 20 and 40 of water erosion is slight. The soil is eas crops grown in the county. However, it i crops. surface layer and subsoil and it has a inches. Runoff is slow and the hazard r to till and is well suited to almost all not well suited for very deep-rooted Loamv Alluvial Land This soil oxurs as small areas in major drainage ways. It is also a principal source of gravel. Nearly all areas are subject to flooding from streams. The soils are shallow and strat~ed. The strata are moderately textured material that is underlain by river sand and gravel. The soils of this land type absorb water at a rapid rate. The available water capacity is low, but many areas have a high water aaarne County-cuP, rime, Final Plat sm~a~, Mhre.o+ws AAebdb Premk ConueOe, Inc. November, 2001