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and crushing operations and for dust control is estimated to not exceed 4,000 gallons per <br /> month during operations. <br /> It is anticipated that sand and gravel excavation, crushing, and stockpiling at the site will <br /> not disturb surface water or ground water quality. Erosion control measures (Best <br /> Management Practices) will be installed along the perimeter of disturbed areas. A <br /> Colorado Department of Public Health and Environment Stormwater Construction Permit <br /> will be obtained prior to the start of mining operations. <br /> Previous test pitting performed by others at the Peters 313 site shows the water table is <br /> located more than 15 feet below the surface; therefore, it is anticipated that no <br /> groundwater will be encountered at the site. Weld County will ensure the pit excavation <br /> will not expose groundwater in the event that mining exceeds 15 feet by staying a <br /> minimum of two feet above groundwater. According to information obtained from the <br /> Colorado Division of Water Resources GIS files,the Peters 313 site is not located within a <br /> designated groundwater basin. <br /> d) Work Area Size <br /> Minimal stockpiling of overburden is anticipated. Mined soils unsuitable for construction <br /> use will be separated from the mined gravels and may be stockpiled at the site. These <br /> soil stockpiles will be utilized for excavation backfill and site reclamation. The active <br /> mining work area at any time will be approximately 5 to 10 acres in size. The active <br /> crushing work area at any time will be approximately 10 to 15 acres in size. <br /> e) Operation Time Table <br /> Mining operations have begun within the original permit area (M-2015-045). It is <br /> anticipated that sand and gravel excavation, processing (rock crushing and screening), <br /> and stockpiling within the amendment area will commence upon receipt of approval from <br /> the Colorado Division of Mining and Geology, and receipt of other necessary permits. <br /> Mining will start on the northwest portion of the permitted area and progress to the <br /> southeast. <br /> Gravel excavation and processing will be seasonal with stockpiling of gravel for future <br /> uses depending upon local road repair and construction needs. The material in stockpiles <br /> may be hauled out of the site at any time. The Peters site should not be considered an <br /> intermittent operation. <br /> f) Mined and Unmined Stratum on the Site <br /> Alluvial material will be mined to bedrock. The estimated thickness of gravel-bearing <br /> zones varies from 0 to 20 feet thick. No high wall mining is anticipated. <br /> The sand and gravel deposits to be mined are stream channel deposits associated with <br /> Porter Creek, an ephemeral stream that flows from Wyoming into Colorado and <br />