2018-03-29_REVISION - M1977534 - Laserfiche WebLink

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Revegetation Assessment Guanella Reservoir Clear Creek County,Colorado 8. The Operator is proposing to remove, at a minimum, 1,611 CY of topsoil from the site. Please specify where this material will be disposed at. ERO Response-At least some of the topsoil/subsoil would be placed at the storage area where no vegetation is growing or is anticipated to grow. The remainder of the topsoil/subsoil would be removed to a disposal location that has not yet been determined. 9. The Operator is proposing to replace the excavated soils with 12" of low permeability clay soils to be covered with 6"of topsoil. The Soils Report from Soil Conservation Service (copy enclosed), which was included in the original application, describes the subsoil as gravel sand loam. The Soils Report also indicates the effective rooting depth is approximately 60". Please provide a technical justification for replacing 12" of the subsoil with low permeability clay soils. ERO Response-The topsoil and subsoil above the barrier would be about 24 inches, which would be sufficient to support the rooting systems of the native plants proposed in the seed mix (see Table 3). References Baumberg, S. 2018. Evaluation Report Review Reclamation on the Guanella Ranch. Prepared for Phil Buckland and Sally Guanella Buckland. March, Colorado State University(CSU) Soil Water and Plant Testing Laboratories. 2018. Soil Sampling Instructions (farmers). http://www.soiltestinglab.colostate.edu/. Last accessed March 1, 2018. Munshower, F. 1993. Practical handbook of disturbed land revegetation. CRC Press Inc. U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. Plant Database. Table 1. Last accessed March 17, 2018. U.S. Department of Agriculture (USDA), U.S. Geological Survey(USS). 1958. Empire Quadrangle map. 7.5 minutes series (topographic).. 1958, photo revised 1974. 7 ERO Resources Corporation