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_21_ Cumulative Impacts Assessment The only existing or proposed coal mining operations that are located within the area of the Animas Coal 14ine are the Allen and Maxwell mines, which are owned and operated by CF67 Steel Corporation. These operations are located along the Purgatoire River, approximately 20 miles west and upstream of the Animas Mine. There is no potential for the Animas Mine and the CF&I operations to produce cumulative effects on the hydrologic balance based on the distance separating these operations. For the life-of-mine area, the underground workings will be extended into adjacent leases. The Moores Canyon drainage, including the upper reaches of three ephemeral tributaries, will be undermined. A portion of the Engleville Canyon drainage basin will also be undermined. Because of the short duration of runoff events which are characteristic of ephemeral streams, possible sub- sidence effects (short of total collapse of the surface) would not be expected to significantly diminish surface flows. No spring and seep areas which were identified in the spring and seep survey overlie the life-of-mine area. Two spring and seep areas which were identified in Moores Canyon lie stratigraphically above, and are hydrologically isolated from, the projected workings. The potential for any effect on the hydrologic balance resulting from subsidence over the life-of-mine workings is minimal. The assessment of the probable cumulative impacts of all anticipated coal mining in the general area on the hydrologic balance, as described in Rule 2.05.6(3), has been made by the Division, and the operations proposed in the application have been designed to prevent damage to the hydrologic balance out- side the proposed permit area. Surface and Ground Water monitoring The applicant has included a plan for monitoring surface and ground water which can potentially be impacted by the operation in Section 2.05.6 (pages 236 and 237) of the application. The Division is in agreement with the monitoring plan, with the addition of the following requirements which are issued as stipulations to this permit: Stipulation No. 5: THE PERMITTEE WILL INCLUDE TOTAL DISSOLVED SOLIDS IN ADDITION TO THE PARAMETERS REQUIRED BY NPDES FOR THE ANALYSIS OF WATER DIS- CHARGED FROM THE SEDIMENT POND. Because the iuppa well (031635) can potentially be impacted by the operation, it must be monitored for changes in physical and chemical characteristics. The following stipulation is, therefore, required: