2017-11-14_REVISION - M1977219 - Laserfiche WebLink

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Exhibit G WATER INFORMATION There is no change to the baseline water information pre- sented from 1995 . The water discussion at that time addressed the needs, uses and surrounding conditions for the general area and will apply to the expansion of the mining area. All surface drainages was will remain in their current state and when recla- mation is completed the mined areas will be graded to retain the current drainage patterns on the site. No ground water will be exposed at this mine and all water used for dust control is purchased from a source approved for that use and hauled to the mine . Site berms and isolation ditches will be placed up-gradient from the disturbed area to prevent stormwater runoff from enter- ing the active mining area. Swales and berms will be used to direct any stormwater runoff to temporary detention ponds where it will be retained for no more then 72 hours before being released. This will provide the necessary time to clean the water to meet our discharge permit standards . Table G contains a list of all wells within 200 feet of the amended permit area and Map Exhibit G-1 shows the location of the well listed on Table G. The shallowest well is listed as being 315 feet deep, so since mining will only take place on the upper 40± feet, mining will not impact the groundwater aquifer associ- ated with the wells . There are no jurisdictional wetlands on the mining operation parts of the new area, therefore no 404 permit is needed. Review of the Reclamation Plan maps shows that the final land configurations for the mine will have the same drainage patterns as what now exits except on Area S where mining will create a hole in the surrounding land. There are not drainage features that cross the mined area and as noted isolations berms and ditches will be placed around the mined area to divert any surface runoff from adjoining parcels around the hole created. The remaining areas (A-F) slope from west to east and or daylights into the undisturbed canyons that travers the site. The eastern sides are open ended so no stormwater will accumulate in the excavated area. No water impoundments, stock ponds or permanent stormwater ponds will be built as part of the reclam- tion plan. Nor will the canyon areas be changed by mining. According to the state engineers records there are two water zones under the mine area. Choosing the shallowest and deepest well from the list and their corresponding ground elevations we can find the approximate ground water table elevation. The first is approximately 280 feet below the surface (5770 msl) and is 80 feet thick, the lower one is 835 feet below the surface (5455 mis) and is approximately 200 feet thick. The lowest point on the mine floor is 6080 or approximately 310 Feet above the closest aquifer. Mining will not impact the wells nor will groundwater be exposed. 11 (revised 11/10/17)