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Two principal ways that gravel pit mining could affect the water quality of the area downstream <br /> are through poor sediment control within the site causing increased sedimentation downstream, <br /> and by fuel leakage from a ruptured tank. Water encountered in the pit will not be released from <br /> the site. The only water that will be found within the disturbed area is storm water runoff and <br /> water hauled to the mining area used in processing and for dust control. Once excavation of new <br /> phases begins, all water from the disturbed area will drain to the benned pit and cannot leave the <br /> site. Fuel leakage is an unanticipated problem because all fuel tanks on site have secondary <br /> containment as well as strict SPCC Plan procedures for spill prevention and control. <br /> According to searches on the Division of Water Resources (DWR) database,there are two wells <br /> within 600 feet of the Garrett Pit site; both are east of the site and are found approximately at <br /> quarter section junctions. Well 8897-F belongs to Albert Claunch and is 345 feet deep. Well <br /> 5873-F belongs to Albert Claunch and is 779 feet deep. Both wells are permitted for irrigation <br /> use. A third well, 306510-, is approximately 720 feet from the property boundary to the south <br /> (location from DWR Well Permit Search) listed for domestic stock use by the Mast family and <br /> drilled to a depth of 220 feet. According to DWR, this well location was spotted from quarters <br /> but is described by the land owner as adjacent to their home; regardless, the well and house are <br /> outside of the 200 foot buffer from the disturbed area. <br /> 2. Groundwater <br /> The site will mine the Quaternary sand and gravel deposit found in the San Luis Valley derived <br /> from alluvial fans draining the San Juan Mountains to the west. Groundwater is encountered <br /> >100 feet below the undisturbed ground surface in undifferentiated alluvial aquifers of the San <br /> Luis Valley. It is not expected that groundwater will be encountered during any phase of mining. <br /> 3. Water Consumption for the Operation and Water Rights <br /> Groundwater is unlikely to be encountered during any phase of mining at the Garrett Pit. <br /> Because the alluvial gravel to be mined is dry, no water losses will occur from the gravel <br /> resource during mining. <br /> Dust will be controlled by water. Water will be used as needed to spot eliminate any problem <br /> dust areas. 0.5 acre-feet per year will be allocated to dust control, or 0.04 acre-feet per month. <br /> King Pit GM►xwkU OW nuociatm PlIk <br /> ,4eptember•2018 G-2 <br />