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EFC1 Southfield Mine - 2010 Annual Hydrology Report May 30, 2011 <br />in the 2009 samples. EFCI has provided copies of the approved parameters list to ACZ to ensure <br />correct analytical results for future samples. <br />Ongoing monitoring of surface flows for Newlin, Magpie, and Second Alkali Creeks provides for <br />identification and evaluation of any future changes in water quality that may result from mining and <br />related activities. Surface water quantity and quality monitoring results through the reporting period <br />indicate no significant impacts to surface water as a result of mining, reclamation, and related <br />activities. <br />Loadout Area <br />The Loadout and adjacent areas fall within the lower sections of the Oak and Chandler Creek <br />drainages, both of which are tributary to the Arkansas River. Oak Creek is a perennial drainage <br />above the municipal well field for the Town of Rockvale. Dependent on water demand and <br />withdrawal levels for Rockvale, flows in Oak Creek below the well field in the 4.7 mile section <br />above the Loadout area may be either perennial or ephemeral. In areas adjacent to the Loadout <br />Area, flows in Oak Creek are frequently ephemeral, and Chandler Creek is considered an ephemeral <br />creek (refer to Section 2.04.7 of the Southfield permit application for more details). EFC1 monitors <br />stream flows adjacent to the Loadout Area at stations OC-1 (Lower Oak Creek) and OC-2 (Upper <br />Oak Creek). EFC1 also monitors any stormwater runoff discharge from the two active <br />sedimentation ponds, Ponds L-1 and L-2, in the Loadout Area. <br />In the Loadout Area, the current surface water monitoring program includes the following <br />monitoring stations, located as shown on Figure 2, Loadout Monitoring Locations: <br />Station Location Designation <br />OC-1 E'hNE'/4, Sec 18 Oak Creek (Lower) TERMINATED <br />OC-2 W'/2NE'/4, Sec 18 Oak Creek (Upper) TERMINATED <br />NPDES 001 W'/2NW'/4, Sec 17 Pond L-1 (outfall to Chandler Creek) <br />NPDES 002 E%2NE'/4, Sec 19 Pond L-2 (outfall to Oak Creek) <br />As shown above, the two monitoring points on Oak Creek were eliminated in accordance with <br />approved Technical Revision No. 37. Oak Creek flow measurements made from 1998 through <br />2009, are presented for the two stream monitoring locations on Table 8. Stream flow data from <br />previous years are documented in AHR's on file at the Division. <br />Review of historic stream flow data for Oak Creek indicates little variance between up stream and <br />down stream monitoring stations but significant reductions in flows for the eight years prior to 2010 <br />reflect continuing drought conditions. <br />Historic field and laboratory water quality data (prior to 2010) for surface water monitoring stations <br />on Oak Creek are summarized in Tables 14 and 15, Water Quality Data, Oak Creek. <br />The two Loadout area sedimentation ponds have historically held only a small amount of water, and <br />have never discharged to the stream system. Similar to previous years, both ponds remained dry so <br />there was no pond discharge during 2010. <br />2010 AHR text.doc Page 17