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Fish Creek Two ponds are situated in separate drainage basins tributary to Fish Creek. One pond, Pond 004, was constructed in 1982 when mining progressed into the Fish Creek basin in the southeast part of the permit area. Pond 004 is located on Cow Camp Creek and drains an area of 393 areas. The pond has a permanent pool of 10 acre-feet. This standing water was not included in the original design of the pond. Total dissolved solids concentrations monitored at the Pond 004 outfall are approaching the levels of the spoil spring discharge of approximately 2200 mg/1. In order to provide sufficient treatment of the 6.7 acre-feet of storm runoff entering the pond, additional data was submitted by the operator which demonstrated that a reduction in orifice size to a 6 inch diameter opening was necessary. Peabody Coal Company has committed to installing the 6 inch orifice at the 004 pond principle spillway by June 1, 1987. With this change, the pond is in compliance with the design standards of Rule 4.05.6 and should continue to meet NPDES permit limitations. A second pond, Pond 007, has been constructed in the Fish Creek drainage basin in a tributary referred to as Bond Creek. Pond 007 drains an area of 124 acres of which 75 acres will be disturbed. The pond is designed to provide storage fora 10 year, 24 hour precipitation event of 2.1 acre-feet and will maintain a permanent pool of 7 acre-feet including pit pumpage. A similar pond configuration was used in the design of this pond as the redesign of ponds 003 and 004. The pond design as submitted is in compliance with the requirements of Rule 4.05.6 and is expected to meet NPDES effluent standards. Monitoring Peabody Coal Company has maintained a continuing surface water monitoring program at the Seneca II Mine following collection of baseline data completed in 1980. The program is designed to monitor flow and water quality of four (4) NPDES sites, at stations below these discharge points on receiving streams, and at upstream locations on Little Grassy, Grassy and Fish Creeks. A revised program was included during 1986 to monitor conditions in the Bond Creek drainage prior to mining. NPDES sites are monitored weekly in accordance with the permit requirements. The stream stations are monitored monthly during periods of stream flow and are sampled three (3) times per year for full-suite water quality constituents. Reports are submitted annually to the Division for review. The continuing monitoring program is sufficient to describe water quality and quantity conditions and to assess any impacts from mining to the hydrologic balance. The operation is in compliance with the requirements of this section. VI. Ground Water Hydrology -Rules 2.04.5, 2.04.7, 2.05.3(4), 2.05.6(3) and 4.05. Ground water hydrology information can be found in Volume III, Tab 7 of the original permit application, in the Preliminary and Second Permit Renewal Adequacy Responses, and in the Annual Hydrologic Reports submitted by Peabody Coal Company. -12-