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Surface Water Monitoring -New Horizon 2 Mine The total number of surface water sampling <br />• locations is five. Calamity Draw containsthree stationswhile the remaining iwo stations are located <br />on the West Lateral Ditch. <br />Stations SW-N102 is located on a tributary of Calamity draw and will remain as a monitoring point <br />for water leaving Pond 007. This will also act as the NPDES 007 discharge monitoring point for <br />Pond 007. The two stations, SW-N108 and SW-N109 are also located on Calamity Draw. The <br />upstream station, SW-N108 is located just west of Lincoln Street as it flows from under the road. <br />This station will define water quality and quantity before it enters the area potentially influenced by <br />the mine. SW-N109 is located on Calamity Draw west of the mine permit boundary but east of the <br />Nucla waste water lagoons. This station will define the water quality and quantity as it leaves the <br />site but before it is influenced by the waste water lagoons. Station SW-N101 was dropped from the <br />monitoring program in the Calamity draw as Stations SW-108 and SW-109 replaced Rs functions. <br />Surface station SW-N 104 monitors the flow and water quality of the West Lateral Ditch as it enters <br />the area upstream of the mine permit. To more accurately reflect the water quality immediately <br />upstream of the mine, the sample site has been moved from its original location within the Town <br />of Nucla to the HDPE inlet structure located at the mine property boundary. Monitoring of the CCC <br />West Lateral Ditch downstream ofthe mine property at site SW-N105 has been discontinued since <br />the installation of the HDPE pipelines mentioned above in West Lateral Irrigation Ditch -Flow <br />and Water Quality section eliminates the possibility any mine water interacting with ditch water. <br />Map 2.04.7-1 shows the new location of SW-N104. <br />Monthly flow, pH, temperature, and conductivity measurements will betaken at the four monitoring <br />locations to assess potential impacts of the mine and to fulfill the requirements for the water <br />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 forthe remaining four stations (SW-N104, <br />SW-N108 and SW-N109). The discharge point at Pond 007 will also be monitored for NPDES <br />requirements. <br /> <br />(REVISED 18 Aug 2003) 2.04.7-41 <br />