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Approved Hydrological Monitoring Program Table 2.04.7-1 summarizes various approved monitoring sites. They aze shown on Map 2.04.7-1, For New Horizon 1 Mine, these sites include those approved under the permit previously held by Peabody Coal and later revised by Western Fuels-Colorado. For New Horizon 2 Mine, the sites are based upon recommendations made by Greystone Consultants and subsequent revisions requested by WFC. Attachment 2.04.7-1 includes Greystone's report. Map 2.04.7-1 shows the locations of surface stations and wells for the New Horizon Mine 2 monitoring program. Modifications to the exisfing monitoring locations for surface and groundwater are discussed below. All data will be reported in the annual hydrology report Surface Water Monitoring -New Horizon 2 Mine The total number of surface water sampling locations is five. Calamity Draw contains three stations while the remaining two stations are located on the West Lateral Ditch. Stations SW-N102 is located on a tributary of Calamity draw and will remain as a monitoring point for water leaving Pond 007. This will also act as the NPDES 007 discharge monitoring point for Pond 007. The two stations, SW-N108 and SW-N109 are also located on Calamity Draw. The upstream station, SW-N108 is located just west of Lincoln Street as it flows from under the road. This station will define water quality and quantity before R enters the area potentially influenced by the mine. SW-N109 is located on Calamity Draw west of the mine permit boundary but east of the Nuda waste water lagoons. This station will define the water qualiiy and quantity as it leaves the site but before ft is influenced by the waste water lagoons. Station SW-N101 was dropped from the monitoring program in the Dalamiiy draw as Stations SW-108 and SW-109 replaced its functions. Surface stations SW-N104 and SW-N105 monitor the West Lateral Ditch. These iwo stations monitor flow and water quality of the ditch system as it enters the upstream area of the mine and as it leaves the mine area. Monthly flow, pH, temperature, and conductivity measurements will be taken at the five monitoring locations fo assess potential impacts of the mine and to fulfill the requirements for the water augmentation plan. Water quality parameters listed in Table 2.04.7-2 will be collected on a quarterly basis for SW-102, and on asemi-annual basis for the remaining four stations (SW-N104, SW- N105, SW-N108 and SW-N109). The discharge point at Pond 007 will also be monitored for NPDES requirements. (Rev. 9/95) 2.04.7-30