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C this drainage rather than installing a culvert. A ditch has also been designed to carry water from this drainage crossing to Pond B, as requested by the Division. This ditch and culvert location are shown on revised Map 16a, Kerr Mine Area Surface Water Hydrology which was submitted last week with Kerr's mid-term adequacy responses. Appropriate revisions have also been made to the permit text and Exhibit 42, Drainage and Sediment Control Plan to reflect this change. Kerr will install the culvert or ditch crossing and if necessary will modify the configuration of the subject ditch during the summer of 1991 when ground conditions permit. e) Please document the drainage system on the shop fill area on map 16A and prepare designs if needed. RESPONSE As requested by the Division, Kerr has provided arrows on Map 16a, Kerr Mine Area Surface Water Hydrology which show the general flow patterns on the shop fill area. As indicated, all drainage from this area flows either into Pond D via the haulroad ditch or Pond C via ditch C-1 or through disturbed area along the southern side of the fill. Revised Map 16a, Kerr Mine Area Surface Water Hydrology which was submitted with Kerr's mid-term responses last week, shows this drainage. f) Design and map the location of the culvert which drains water from the south end of Pit 1, below the pit access road and leading to culvert 3. Also design and map the ditch between this culvert and culvert 3. RESPONSE The culvert which drains water from the south end of Pit 1, below the pit access road and leading to culvert 3 has been designed and mapped pursuant to this Division request. The ditch feeding and draining this culvert has also been designed and mapped and has now been designated as Ditch E-1. Revised Map 16a, Kerr Mine Area Surface Water Hydrology, shows the locations for these structures and appropriate revisions have been made to Exhibit 42, Drainage and Sediment Control Plan to incorporate the designs into the permit document. 3