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Baseline Hydrologic Monitoring Plan — Hansen Project 5 <br />mine plan and facilities layout have not been finalized at this time. This monitoring plan will be reviewed <br />and possibly modified after the final mine plan and facility alternatives are available. <br />The goals of Baseline Hydrologic Monitoring Plan are to: <br />1. Establish the methodology that will be used to document the baseline characteristics of surface <br />water and groundwater in the Hansen Project area to support the preparation of an Environmental <br />Protection Plan for a 112d mine permit application. <br />2. Develop surface water and groundwater data for engineering design and mine planning. <br />3. Provide a basis for the evaluation of Project alternatives to manage and protect water resources. <br />4. Develop surface water and groundwater data for reclamation and mine closure planning. <br />Specific objectives of the Baseline Hydrologic Monitoring Program are to: <br />1. Monitor surface water flow and quality in the Hansen Project area. <br />2. Monitor groundwater occurrence, levels, and quality in the Hansen Project area. <br />3. Determine hydrologic properties of water bearing strata, including hydraulic conductivity, gradient <br />(horizontal and vertical), and direction of flow. <br />4. Establish Quality Assurance /Quality Control (QA /QC) and standard procedures for data collection, <br />evaluation, and reporting. <br />The Monitoring Plan is intended to provide information that DMRS and Black Range project managers, <br />Black Range field personnel, and their consultants will need to locate the sample stations, identify the <br />sampling frequency, measure field parameters and hydraulic properties for geologic strata, collect water <br />samples, collect proper types and numbers of QA/QC samples, evaluate the laboratory results, and report <br />those results. <br />2. SITE DESCRIPTION <br />2.1 Climatology <br />The greater Taylor Ranch Project area spans 10,850 acres and is subject to varying climatic conditions <br />depending on elevation, wind patterns, and slope aspect. The semi -arid lower portions of the Project, <br />including the Hansen Project area, receive an estimated 10 to 12 inches of precipitation per year, while <br />higher elevations in the greater Taylor Ranch CUP area may receive more than 20 inches per year. <br />2.1.1 Meteorological Stations <br />Long -term weather records are available from meteorological stations located at Salida, Guffey, Canon <br />City, and Westcliffe. The monthly climate summary for each station is provided in Table 1, which includes <br />the average maximum temperature, average minimum temperature, average total precipitation, average <br />total snowfall, average snow depth, and annual averages for each station. The five stations show that the <br />rainy season occurs from April through September, and the dry season occurs from October through <br />March. <br />The highest annual total precipitation (15.79 in) among the stations occurs at the Guffey Station while the <br />highest average snowfall (86.8 in) occurs at the Westcliffe station (Table 1). The lowest annual total <br />precipitation (7.32 in) and snowfall (34.6 in) were recorded at the Salida 3 W station. The Guffey 10 SE <br />station is the considered most representative of the greater Taylor Ranch CUP area due to its proximity <br />(approximately 9.36 miles north) and similarity in elevation (8,658 feet/amsl). <br />4153A.140129 Whetstone Associates • <br />