2008-05-14_REPORT - C1981014 - Laserfiche WebLink

Home Browse Search

EFCI Southfield Mine -Year 2007Annual Hydrology Report April 21, 2008 3.3 Surface Water Monitoring Results Mine Area The Mine and adjacent areas fall within the lower portions of the Magpie and Newlin Creek drainages and encompass the central portion of the Second Alkali Creek drainage, all of which aze tributary to the Arkansas River. Newlin Creek is a perennial drainage above the mine property to the diversion point for the City of Florence Municipal Water Supply. Within the mine property, flows in Newlin, Magpie, and Second Alkali Creeks aze all ephemeral (refer to Section 2.04.7 of the Southfield Mining and Reclamation Plan document for more details). EFCI monitors stream flows in Newlin, Magpie, and Second Alkali Creeks. EFCI also monitors any storm water runoff discharge from active sedimentation structures and historically monitored any mine water discharge from the mine water treatment system, which included Fresh Water Pond No. 3, under the terms of an approved CDPS -Permit. In addition to the mine water treatment and storage ponds, there were originally three sedimentation ponds, Sedimentation Ponds 1, 4, and 5, in the Mine Area. In the Mine Area, the current surface water monitoring program includes the following monitoring stations, located as shown on Figure 1, Mine Monitoring Locations: Station Location Designation NC-2 E'/zSE'/<, Sec 26 NC-1 W'hNE'/4, Sec 19 MC-1 E'/zNW'/4, Sec 30 MC-2 W'/zNE'/4, Sec 30 SA-1 E'/ZNW'/<, Sec 24 002 E'/zNW'/<, Sec 30 004 W'/zSE'/<, Sec 19 Newlin Creek Up stream Newlin Creek Down Stream Magpie Creek Up stream Magpie Creek Down Stream Second Alkali Creek Pond 4 Outlet (Newlin Ck) NPDES Pond 5 Outlet (Magpie Ck) NPDES Monitoring Stations 001 (Pond 1 Outlet to Magpie Creek) and 003 (Pond 3 Outlet to Magpie Creek) were previously included in the monitoring program. Ponds 1, 2, and 3 have, however, been removed and reclaimed in conjunction with final mine reclamation activities and Stations 001 and 003 have been eliminated from ongoing monitoring. EFCI also no longer includes data from the single monitoring point that existed on Newlin Creek prior to second quarter of 1997, when the two current monitoring points were established. Data from the original Newlin Creek monitoring point (NC-l) was included in previous Annual Hydrology Reports. As of October 2003 in accordance with Technical Revision 35 (TR-35), monitoring of surface water is now conducted on a semi-annual basis, typically in April and December. Field and laboratory analysis data for surface water monitoring stations are summarized in the following discussions. Raw field and laboratory data for the 2007 water yeaz are provided in Appendix B, although there were no dischazges in 2007 so there is no analytical data enclosed. Stream flow measurements since 1998 are provided in Table 9. There was adequate snowfall and rain events during the winter and spring to generate a flow in Newlin Creek during the 2"d quarter 2007 AHR.doc WP Page 18