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Mr. Peter Hays <br />Re: SerFer Pit, Adequacy Letter Response <br />August IS, 2008 <br />Page 3 of 6 <br />5. Please commit to provide the Division with a copy of Town, of Windsor Floodplain <br />Development Permit-for the SerFer Pit Project: <br />Upon approval of the Floodplain Development Permit by the Town of Windsor, a copy <br />will be submitted to the Division of Reclamation Mining and Safety. <br />6. Please commit to not exposing groundwater until the well permit and temporary <br />substitute water supply plan are obtained from the SEO. Please commit to providing the <br />Division with copies of the well permit and temporary substitute water supply plan once <br />approved by the State Engineers Office (SEO). <br />Connell Resources, Inc. will not expose groundwater until the well permit and temporary <br />substitute water supply plan are obtained from the State Engineer's Office (SEO). Copies <br />of each will be supplied to the Division of Reclamation Mining and Safety upon approval <br />from the SEO. <br />7. The applicant states on page 4 of the SerFer Pit Groundwater Monitoring Plan that <br />baseline date will be collected from the piezometers on a monthly basis (collected prior to. <br />dewatering operations). Please commit to collecting and reporting five (5) quarters of <br />data prior to starting dewatering operations. <br />Connell Resources, Inc. will monitor groundwater elevations monthly in the established <br />monitoring wells. Trigger points will be based upon the estimated groundwater depth as <br />well as actual observed groundwater depths identified during the installation of the <br />monitoring wells for this site. The trigger points will be set at two feet above or below the <br />historic high or low elevations in each well. <br />Historical data in the vicinity of the proposed site is consistent with the estimated depth <br />of 3 to ,4 feet. According to the Subsurface Exploration/Monitor Well Installation report <br />for the Kyger Pit, located on the northern boundary of the SerFer Pit, groundwater <br />depths ranged from 5 to 10 feet. The slight difference in groundwater height is to be <br />expected since the Serfer Pit is located closer to the Cache la Poudre River. A copy of <br />this report is included as an attachment to this letter. <br />The property located on the eastern border of the Kyger Pit and northeast of the SerFer <br />Pit has three permitted wells on site. According to the State Engineer Database, the <br />groundwater depths were recorded as 5 feet, 6 feet, and 7 feet. Figure 1, which is <br />attached to. this letter, shows the location and recorded depth of these wells. <br />In order to protect against adverse effects on existing groundwater conditions, the trigger <br />elevation for each monitoring well will be two feet above or below the elevation of the <br />observed and estimated level at each well for three consecutive months. It is important to <br />note that the estimated level for the site. is 3 to 4 feet. Based on historical data from wells <br />that are in close proximity to the SerFer Pit, the groundwater elevation for the <br />southwestern monitoring well is expected to be approximately 3 -feet below the surface.