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<br />' this installation will be provided to the Division within 30 days of the completion <br />of the well. This well will be maintained and employed for ground water <br />monitoring of the Santa Fe Aquifer as is approved in the permit for Wells M-9, <br />M-12, and M-13." <br />' Ms. Alana Scott of BMRI coordinated securing a suitable drilling rig and necessary materials to <br />effect the drilling and completion of these two new wells. She also notified the Division of <br />' Water Resources of BMRl's intent to install the two additional monitoring wells. On October <br />20, ] 993, BMRI received verbal approval for the well locations and clarification regarding <br />specific activities related to the two new wells. The Division stated that: 1) pump tests were <br />not required to be conducted, and 2) that geophysical logging was only required on well M-14. <br />' The provisions of conditions 2 and 4 have been met, and this report describes the field <br />investigations related to the installation of the two additional monitoring wells, the geophysical <br />logging of monitoring well M-14, field water quality parameters from those wells, and the <br />hydrogeology in the vicinity of the tailings facility and collection pond. <br />SITE GEOLOGY <br />' The San Luis Gold Mine is located in the foothills of the Sangre de Cristo mountains, about 5 <br />miles northeast of the town of San Luis, along the southeastern margin of the Stm Luis Valley. <br />' Sedimentary deposition in the San Luis Valley accumulated in grabens or downwarps <br />concurrently with block faulting controlled by the Neogene Rio Grande Rift system. The <br />' monitoring wells in the vicinity of the tailings facility are completed in the Tertiary Santa Fe <br />Formation. The Santa Fe Formation consists of a repetitive fanglomerate sequence of loosely <br />' consolidated silts, sands, gravels, and cobble lenses. <br />The drilling of the two additional monitoring wells, provided an opportunity to examine the <br />geologic section penetrated through return drill samples. The reverse air circullation aspect of <br />the drilling operation provided continuous, unaltered samples of the penetrated formation. The <br />' -2- <br />