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<br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem ul Natural Resources <br />U13 Sherman SL, Room 115 ~ly~~ <br />Denver, Colorado 80:03 I <br />Phone: 1303) 866-7567 <br />FAX: (3031 832 8106 <br />• DEPAR'T'MENT OF <br />NATURAL <br />To: Dan Mathews e ~ ~S~~CES <br />FLODI: Barbara Pavlik 6 Roy Romer <br />Governor <br />Date: Aril 15 1996 lames S. Lochhead <br />p ~ Exec wive Director <br />Mkhael B. Long <br />Re: Review of Annual Hydrology Report (Groundwater Portion) Diva lion D~recinr <br />McClane & Munger Mines (C-80-004 6 C-81-020) <br />I have completed a review of the groundwater portion of the Annual <br />Hydrology Report for the McClane & Munger Mines. My comments are <br />presented below. Susan Burgmaier will be presenting you with a <br />review of the surface water portion of the AHR for these mines. <br />Without further ado, then........ <br />1) The PHC sections of these permits are vague with regard <br />to quantification of potential effects of mining on the <br />groundwater regime. However, both PHC's predict minimal <br />impacts. The miniscule amount of flow recorded into the <br />underground workings appears to support a hypothesis of <br />insignificant impact to groundwater quantity. <br />Additionally, no significant trends were noted in the <br />groundwater quality samples. Therefore, the AHR data <br />appear to be congruent with the predictions in the PHC. <br />2) It is my opinion that monitoring of the dry well in the <br />proposed waste disposal area could be discontinued until <br />shortly before the construction of the waste disposal <br />area is started. The well should be probed for water <br />content prior to commencing the construction of the waste <br />pile so that, if groundwater is present at that time, <br />then a true background sample may be collected for <br />chemical analysis. <br />3) The operator provides three "Ventilation and Projection" <br />maps in the AHR. None of these maps show the hydrologic <br />monitoring stations. A map showing the hydrologic <br />monitoring stations would be more helpful to both the <br />person reviewing the AHR and to the general public, and <br />should, therefore, be provided in subsequent AHRs. <br />If you or the operator have any questions, please call. <br />cc: Larry Routten, Susan Burgmaier <br />