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Revegetation Assessment <br /> Guanella Reservoir <br /> Clear Creek County,Colorado <br /> 1. The Operator is proposing to excavate a minimum of 18"of topsoil and subsoil to eliminate <br /> saline conditions within the reclaimed area. Please describe what field methods will be used <br /> to determine the depth of excavated material or otherwise describe how the Operator will <br /> ensure the soils are excavated to an appropriate depth. <br /> ERO Response-The topsoils were evaluated on March 2, 2018 for nutrients. Further testing <br /> would be conducted in the spring when the soils are no longer frozen. <br /> 2. Specify the timing of soil excavation and provide a schedule for reseeding the excavated <br /> areas. <br /> ERO Response- Based on the plan prepared after the soil testing in the spring,the <br /> excavation would occur in the summer and seeding would occur in the fall before the soils <br /> freeze. <br /> 3. In order to determine if the soil to be imported is of good quality and is appropriate for the <br /> post-mining land use of pastureland,the Division will require the Operator to sample and <br /> analyze both the subsoil and topsoil to be imported to the site. The soil samples must be <br /> analyzed at an accredited laboratory and the samples shall be analyzed for: macronutrients, <br /> pH, electrical conductivity,and organic matter. The results of the analyses shall be <br /> submitted for Division approval prior to the importation of topsoil. The Operator is <br /> encouraged to consult with the Division prior to collecting samples to ensure the samples <br /> are collected properly and the correct analytical methods are used. <br /> ERO Response-The topsoil used would be sampled and sent to the CSU Soil Testing Lab <br /> (following their sampling procedures)for Routine Soil+SAR testing plus other testing <br /> recommended by DRMS. The results would be submitted to DRMS for approval prior to <br /> applying the topsoil. <br /> 6. Identify the source(s) of imported topsoil and subsoil. <br /> ERO Response-The topsoil source has not yet been determined. <br /> 7. The Operator has stated the imported soil will be certified weed free. The Division is <br /> unfamiliar with a certification program for weed free soil. Please describe how the Operator <br /> will ensure the imported soil is weed free. <br /> ERO Response-The topsoil would be inspected at its point of origin prior to placement in <br /> the project area. If noxious weeds are growing on the topsoil,then the topsoil would not be <br /> used. Other noxious weed best management practices would use certified weed-free mulch <br /> and seeds and inspecting the site after seeding to determine if noxious weeds are growing. <br /> If weed are growing,the appropriate noxious weed-control methods would be used. <br /> 6 <br /> Co"oor3t 0 <br />