Laserfiche WebLink
r <br /> o Transit Mix Concrete Co. <br /> trends northeast-southwest along the west fault line. According to the mining plan maps <br /> submitted,this portion of the fault zone will be mined out by the North Pit Expansion. <br /> Does the applicant anticipate any slope stability issues along the southern pit wall of the <br /> North Pit Expansion related to mining out this arm of the creek fault zone?Because the <br /> North Pit Expansion will be mined below the elevation of Deadman Creek, what <br /> potential impacts to Deadman Creek,if any,might occur due to mining out this arm of <br /> the creek fault zone?Might this fracture zone work as a water conduit into the pit during <br /> high precipitation events?If so,will the applicant have sufficient pumping capacity to <br /> mitigate? <br /> Response: The configuration of the North Pit Extension has been modified so that <br /> the base of pit does not mine below the elevation of Deadman Creek.As a result, <br /> there is no longer a southern pit wall for the North Pit Extension and considerations <br /> for slope stability and water management for that wall are no longer applicable. <br /> 163) Comment: The text states that well permit information from the DWR well database <br /> indicates that water supply wells located west of the high-angle thrust faults produce <br /> water from the granodiorite hard rock. Are these wells completed in the Little Turkey <br /> Creek fault zone? <br /> Response: The majority of the wells located to the west of the proposed quarry are <br /> completed in the faulted areas associated with Little Turkey Creek. These wells are <br /> located upgradient of the proposed quarry,and water will continue to reach these <br /> wells prior to reaching the quarry area. Mining operations are staying at least 10 <br /> feet above the creek elevation,and above the water table. Several boreholes were <br /> drilled in this area,and no significant sources of water were identified. Drilling <br /> mud was continuously lost with no fluid return while drilling any of the boreholes. <br /> Considering that the groundwater elevation is below the mine elevation, <br /> groundwater will not be intercepted by the mine,and there should be no impacts to <br /> the ground water system or the neighboring wells. <br /> Potential Surface Water Impacts <br /> 164) Comment: The text states that the North Pit Extension and the northeast portion of the <br /> North Pit will be filled to establish positive drainage to Deadman Creek,thus eliminating <br /> the need for pumping. On Figure G-12,it is difficult to determine how positive drainage <br /> will be established due to the green pattern that overlays the contours in this area. Please <br /> explain in detail how positive drainage will be created in disturbed areas for reclamation, <br /> or revise Figure G-12 so that the reclamation area pattern does not cover up the <br /> underlying contours to such an extent. <br /> Response: The North Pit Extension and the northeast portion of the North Pit will <br /> be filled with fines generated while mining the South Pit. The fines will be placed so <br /> that there is at least a 2% slope towards the creek. The figures and cross sections in <br /> Exhibits C,F,and G have been revised to better show site topography. These <br /> Hitch Rack Ranch Quarry(M-2016-010) <br /> Response to Comments—July 14, 2016 <br />