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<br />APPROVED HYDROLOGICAL MONITORING PROGRAM <br />Table 2.04.7-1 summarizes various approved monitoring sites. They are shown on Map 2.04.7- <br />1. For New Horizon 1 Mine, these sites include those approved under the permit previously held <br />by Peabody Coal and later revised by Western Fuels-Colorado. For New Horizon 2 Mine, the <br />sites are based upon recommendations made by Greystone Consultants and subsequent <br />revisions requested by WFC. Attachment 2.04.7-1 includes Greystone's report. The monitoring <br />plan will be adequate for the Garvey and Burbridge lease included in the permit boundary. <br />Map 2.04.7-1 shows the locations of surface stations and wells for the New Horizon Mine 2 <br />monitoring program. Modifications to the existing monitoring locations for surface and <br />groundwater are discussed below. All data will be reported in the annual hydrology report. <br />Surtace Water Monitoring -New Horizon 2 Mine The total number of surface water sampling <br />locations is five. Calamity Draw contains three stations while the remaining two stations are <br />located on the West Lateral Ditch. <br />Stations SW-N102 is located on a tributary of Calamity draw and will remain as a monitoring <br />point for water leaving Pond 007. This will also act as the NPDES 007 discharge monitoring <br />point for Pond 007. The two stations, SW-N108 and SW-N109 are also located on Calamity <br />Draw. The upstream station, SW-N108 is located just west of Lincoln Street as it flows from <br />under the road. This station will define water quality and quantity before it enters the area <br />potentially influenced by the mine. SW-N109 is located on Calamity Draw west of the mine <br />• permit boundary but east of the Nucla waste water lagoons. This station will define the water <br />quality and quantity as it leaves the site but before it is influenced by the waste water lagoons. <br />Station SW-N101 was dropped from the monitoring program in the Calamity draw as Stations <br />SW-108 and SW-109 replaced its functions. <br />Surface stations SW-N104 and SW-N 105 monitor the West Lateral Ditch. These two stations <br />monitor flow and water quality of the ditch system as it enters the upstream area of the mine and <br />as it leaves the mine area. <br />Monthly flaw, pH, temperature, and conductivity measurements will be taken at the five <br />monitoring locations to assess potential impacts of the mine and to fulfill the requirements for the <br />water augmentation plan. Water quality parameters listed in Table 2.04.7-2 will be collected on a <br />quarterly basis for SW-102, and on asemi-annual basis for the remaining Tour stations (SW- <br />N104, SW-N105, SW-N108 and SW-N109). The discharge point at Pond 007 will also be <br />monitored for NPDES requirements. <br />Groundwater Monitoring -New Horizon 2 Mine <br />Western Fuels proposed and was authorized to modify the groundwater monitoring program to <br />include locations directly up and down gradient of the site. The approved plan consists of <br />existing wells and installation of a new set of wells to monitor the overburden, Dakota Coal and <br />the underburden aquifers (GW-N36, GW-N37 and GW-N38) in the northeast corner of the site, <br />and two alluvial wells (G-N39 and GW-N40) to be located on Calamity Draw upstream and <br />• downstream of the mine permit boundary (Map 2.04.7-1). The five new wells were completed in <br />May 1993. The well completion reports can be found in Attachment 2.04.7-2 at the end of this <br />section. The upstream alluvial well is located in the flood plain near Lincoln Street in the south <br />