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The general ground water gradient, to the extent that it has been documented <br />in the area of the Keenesburg Mine property, trends downgradient to the <br />northeast. Recharge of the aquifer in the "spoil area" continues to be limited <br />to a single source, the localized infiltration of precipitation to the subsurface. <br />There is still no evidence of any significant ground water recharge to the site <br />from the Ennis Draw fluvial ground water system. Ground water elevations in <br />those existing Ennis Draw wells close to the Keenesburg Mine site are <br />significantly higher than in either the spoil monitoring well (SMW-2) or the <br />ash monitoring wells (AMW-1 or AMW-2). <br />It is CEC's position that no adverse affect on the overall hydrologic balance <br />of the Keenesburg Mine site should result from the continued ash disposal <br />operation (or the addition of mine waste rock to the ash disposal) and/or the <br />reclamation operations. Further, ground water levels in the former mined <br />areas should be expected to recover to approximately their pre-mining levels <br />following the conclusion of all CEC operations (see McWhorter report, <br />Appendix I-1 to Permit C-81-028). CEC does not anticipate that it will be <br />necessary to treat either ground or surface waters at the Keenesburg Mine <br />site. <br />• In the course of applying for, and obtaining approval to dispose of mine waste <br />rock (in the "ash disposal pit") at the Keenesburg Mine site, CEC submitted, <br />and obtained approval for aGround-Water Monitoring Plan from CDPHE. <br />As a requirement of the plan, CEC provides notification that the data <br />developed under the Monitoring Plan for 1999 has been placed in the <br />operating record. Tliis is the second annual notice pertaining to the Ground- <br />Water Monitoring Plan. <br /> <br />AIIR-1999 -46- <br />