GENERAL34093 - Laserfiche WebLink

Home Browse Search

1994 at 38 gpm. Temperature and most chemical parameters have also remained constant over the mine's 10-year mining term. A slight elevation in conductivity has occurred in the Caldirola Well, exceeding 600 mg/l afrer 1987. Water depth has dropped due to the dry conditions experienced in the area. Further review of this fact by the Division in 1990 stated that the water level drop is not related to the mine water being pumped from the mine. The groundwater monitoring plan meets the requirements of Rule 4.05.13(1). In regard to surface water monitoring, there never has been any surface water to monitor at either the mine or sales site. Lewis Gulch drainage is an ephemeral drainage with most all its surface flow divertP,d by the local towns upstream in the headwaters of the West Mountains to the west. South Oak Creek, also an ephemeral drainage, is adjacent to the sales site but only contains surface flow in times of flooding. The north spoil pile and dewatering pump both have NPDES permits and are monitored accordingly for excedences. No excedences have occurred to date. The mine dewatering pump was decommissioned in September 1993 and is no longer pumping water for discharge to the surface. G. Transfer of Wells Twin Pines Investment Limited plans to reclaim the TPW-1 well prior to Phase Ili, while the Caldirola well is owned by the city of Rockvale. The well was originally drilled by Mr. Caldirola, owner of the historic Caldirola Mine. For additional information on the historical significance of this well, please refer to Appendix D of the permit application. H. Discharge of Water into an Underground Mine There is no discharge of surface water or other underground flow into the Twin Pines No. 2 Mine. No discharge is planned for the reclamation of the site or during the teen of this permit. Stream Buffer Zones There are no perennial streams or surface drainages in either the mine or sales area that support significant biological communities as described in Rule 4.05.18(3). J. Probable Hydrologic Consequences The original Findings Document includes extensive information regarding the probable hydrologic consequences that may result from mining operations of the Twin Pines No. 2 Mine. Extensive information as to the geologic and hydrologic character of the region can also be determined from the original Findings Document. Since the mine has ceased mining operations, no additional impact to the hydrologic system is expected. Subsequent reviews of hydrology data verify no impact. Therefore, the information and hydrologic 24