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EFCI Southfield Mine - 2008 Annual Hydrology Report April 15, 2009 <br />through September by rain events. Therefore, no discharge water samples were collected during <br />2008. <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 this reporting <br />period indicate no significant impacts to surface water as a result of mining and related 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 <br />ephemeral creek (refer to Section 2.04.7 of the Southfield permit application for more details). <br />EFCI monitors stream flows adjacent to the Loadout Area at stations OC-1 (Lower Oak Creek) and <br />OC-2 (Upper Oak Creek). EFCI also monitors any stormwater runoff discharge from the two <br />active 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 />Designation <br />Station Location <br />OC-1 E'/2NE'/4, Sec 18 <br />OC-2 W'/2NE'/4, Sec 18 <br />NPDES 001 W'/2NW'/4, Sec 17 <br />NPDES 002 E%zNE'/4, Sec 19 <br />Oak Creek (Lower) <br />Oak Creek (Upper) <br />Pond L-1 (outfall to Chandler Creek) <br />Pond L-2 (outfall to Oak Creek) <br />Oak Creek flow measurements made after 1998 are presented for all stream monitoring locations on <br />Table 8. Stream flow data from previous years are documented in AHR's on file at the Division. <br />Total precipitation during the year was below normal, with most of the measurable precipitation <br />falling during the late winter and summer. Runoff from melting snow and limited rain events <br />caused Oak Creek to flow during the first half of the year. <br />Two water samples from Oak Creek were submitted to the ACZ lab for analysis in May. Testing <br />instructions on file at the lab specified dissolved rather than total species concentrations for five of <br />the required parameters. Dissolved concentrations were therefor analyzed for calcium, magnesium, <br />manganese, sodium, and iron. These data are not included in Tables 14 and 15 for Oak Creek. EFCI <br />has provided copies of the approved laboratory testing specifications to ACZ to ensure correct <br />analytical results for future samples. <br />2008 AHR.doc WP Page 19