2007-12-19_REVISION - M1988112 (12)

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G.4 West Pit and Salazar Ranch Monitoring The current water monitoring program for the San Luis Mine is outlined in Technical Revision 32, Table 1-4. The monitoring described therein for the TDA remains active. However, this permit amendment revises the water monitoring in the vicinity of the West Pit and Salazar Ranch. G.4.1 West Pit Monitoring The water management program described in this permit amendment essentially continues the water management program implemented as part of TR-26. That is, ground water levels will be maintained to prevent outflow from the pit area and to limit fluctuation of the ground water table. Monitoring of the TR-26 water management program has demonstrated that the combination of ground water pumping in the West Pit and adjacent alluvial aquifer consistently and completely controls the flow of ground water as planned. Furthermore, the extensive water quality database also supports the conclusion that water quality has stabilized in the West Pit and vicinity. Because of the long-term data record associated with the West Pit water management program, and the fact that the revised water management program outlined in this permit amendment is based on the same ground water control program, BMRI proposes to revise the West Pit monitoring program as indicated in Table G.4-1. The monitoring indicated in Table G.4-1 will maintain the same level of environmental protection as has been provided. G.4.2 Salazar Ranch and Vicinity Monitoring of irrigation activities will be conducted at the Salazar Ranch. Table G.4- 1 provides a summary of monitoring associated with the irrigation activity. The monitoring presented in this section will ensure that there remains no adverse affect to ground water. In 2001, BMRI entered into an agreement with the San Luis Water and Sanitation District to install and monitor five ground water wells in the aquifer between the Battle Mountain Resources, Inc. 38 P:1Pmjectst212-Newmont(SenUus)\-. uis\Penrcmt Amendment - West Fit MntmgemenAV5 Report & PDFATextTetmitAmendmem_v5c.doc December 2007