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<br />Page 2 <br />1. Continue monitoring water levels in all wells. <br />2. Monthly monitor field parameters in all alluvial wells, all surface <br />water sites, the spoils wells, the pollution plume wells, and wells <br />downgradient of present mining (GW-544P1, GW-S44P2, GW-544, <br />GW-S8-P1 , GW-ST) . ~ ~,' _S42P i `~ ~ f-- ~ ~ W ~4~ <br />3. For the bedrock wells, do a full suite analysis semi-annually (June <br />and October). <br />4. For alluvial wells, do a full suite analysis tri-annually (April, <br />June, September). <br />5. For surface water sites, do a full suite analysis quarterly. <br />6. Monitor all springs to establish baseline data. They should be <br />monitored monthly for flows and field parameters except during <br />snowpack. A one-time, full suite analysis should also be performed. <br />They should submit to the Division as a minor revision an updated map and <br />table detailing each well, the parameters monitored, how often, and when. In <br />addition, they should be made aware that as mining progresses, their <br />monitoring program may change to reflect monitoring of those wells <br />downgradient of mining. <br />Following are my comments on their Annual Hydrology Report. <br />I. Groundwater <br />A. Quantity <br />1. Mention is made of possible vertical leakage from the Trout <br />Creek Sandstone to the bottom of the Wolf Creek Coal due to <br />depressurization while mining as an explanation for the <br />decline in water level 1n well GW-538. Can it be determined <br />that such leakage is occurring? <br />Gw-Ib ~,clCk-$ <br />-- 2. Sevet~al wells are not reported in the 1983 report. What <br />happened to these wells? If these were mined through, that <br />should be addressed and the map updated. <br />3. On Exhibit 7-2, the well identified as SW-S42 should be GW-542. <br />4. It would be useful to have data from well GW-55 installed in <br />the Trout Creek Sandstone. This might help in the <br />determination of any dewatering going on in this unit. Water <br />quality was reported in 1983; why were water levels not <br />reported? <br />