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<br />Run Thompson <br />Page 2 <br />04/30/99 <br />r. <br />u <br />Two surface water stations are monitored on Ciruela Canyon. CCS-1 is located <br />over SW1 longwall panel that was mined in the late 1980's. CCS-2 is located <br />below all mining in the canyon. No flows were recorded in 1998 in this ephemeral <br />stream at either of these stations. However, field inspection indicated the evidence <br />of a significant flow in July and August due to heavy, monsoon-type storm events, <br />typical of the area. <br />Ponds 3 and 4 remained operational throughout most of 1998, although neither <br />pond held any significant amount of water and did not discharge. Pond 3 and pond <br />4 were removed in November of 1998. All sediment ponds have been reclaimed at <br />this site. Runoff from the disturbed area of the mine site has no effect on the <br />quantity or quality of the Purgatoire River system. <br />Ground Water Quantity and Quality <br />The Division expressed concerns as a result of the 1996 AHR review that bedrock <br />water level declines are greater than predicted in the probable hydrologic <br />consequences section of the permit application. Drawdown estimates of bedrock <br />water levels due to mining and subsidence were estimated in the permit to be one <br />foot at up to 2.1 miles (11,088 feet). Review of the average depth-to-water <br />readings for coal and overburden wells indicate drawdowns are substantially more <br />than predicted (Table A). 1997 data indicated that the declining trend reversed at <br />NM-21 in the coal seam and water levels had begun to rise. 1998 data from the <br />late fall monitoring episode indicates water level recovery at all bedrock sites, likely <br />a result of continued flooding of the northern section of the workings, as water <br />moves down dip to the north and east. Increased water elevation is noted in <br />overburden well NM-20. <br />Table A <br />Well Zone Distance Depth to Depth to Depth to Depth to Depth to <br /> from mined water water water water water <br /> area 1994 1995 1996 1997 1998 <br />NM-• Ovbrdn 6000 ft 275 ft 320 ft 357 ft 363 ft 350 ft <br />20 <br />NM- Coal 4000 ft 664 ft 796 ft N/A 762 ft 755 ft <br />21 <br />NM- Ovbrdn 10,000 ft 268 ft 374 ft 436 ft 440 ft 377 ft <br />22 <br />SF-2 Ovbrdn 3000 ft 518 ft 526 ft 653 ft 681 ft 677 ft <br />