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J&T Consulting, Inc. <br />January 3, 2007 <br />Erica Crosby <br />Environmental Protection Specialist <br />State of Colorado <br />Division of Reclamation, Mining, 8~ Safety <br />1313 Sherman Street -Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />JAN 0; 4 '2007 <br />Division of Reclamation, <br />Mining and Safety <br />RE: NCCI Pit #1, Technical Revision No. 3 Adequacy Review Response Questions <br />File No. M-2001-107 <br />Dear Ms. Crosby, <br />We have received the questions that the Division has regarding NCCI's Technical Revision No. <br />3 adequacy review response. NCCI offers the following response to the two questions that the <br />Division requires be addressed for the NCCI Pit #1 Technical Revision No. 3 request to be <br />approved: <br />1. NCCI submitted a map depicting 8 monitoring well locations and provided water level readings <br />for the wells. Please provide the Division with a monitoring plan, including the parameters to be <br />monitored and the timing of well data submittal. Typically field parameters are obtained and <br />submitted with the annual reclamation report <br />NCCI will be implementing recharge ditches/ponds around the perimeter of the mine to minimize <br />the affect that dewatering activities will have on the surrounding aquifer. NCCI intends to <br />construct the recharge ditches/ponds and begin the recharge activities as soon as possible. It <br />will take approximately 30 days for the cone of depressionlradius of influence to stabilize after <br />the recharge ditches/ponds have been implemented. Once the recharge ditcheslponds are in <br />use and the cone of depression/radius of influence has stabilized NCCI will begin measuring <br />and recording the groundwater depths in each of the monitoring wells. <br />For the first year after the recharge ditches/ponds are in use the groundwater depths will be <br />measured and recorded at least monthly in each well to establish what the seasonal <br />groundwater levels are for the stabilized cone of depression/radius of influence. These <br />measurements will be used as a benchmark for maintaining the groundwater levels in <br />subsequent years. <br />After the first year the groundwater depths will be measured and recorded on the same <br />schedule to verify that the benchmark depths are being maintained. It is NCCI's goal to maintain <br />the groundwater depths within one to two feet of the benchmark depths. If the measured <br />groundwater depths are seen to be outside that range for any area, NCCI will increase the <br />1400 W 122n° Avenue -Suite 120 • W estminster CO 80234 • Ph: 30357-0735 • Fax: 303-020-0343 <br />