Laserfiche WebLink
Cretaceous Dakota Sandstone/Dakota Group and underlying Cheyenne Sandstone Member of the <br /> Purgatoire Formation. The Pierre Shale depositionally sits between approximately 850—5,000 <br /> feet above the Dakota Sandstone. This wide range accounts for potential erosive loss of the <br /> Pierre Shale that is between 0—4,000 feet thick in the area. It is not expected that groundwater <br /> will be encountered during any phase of mining. <br /> 3. Water Consumption for the Operation and Water Rights <br /> Groundwater is very unlikely to be encountered during any phase of mining at the Bradford <br /> Mesa Quarry; therefore, a Substitute Water Supply Plan (SWSP) is not necessary. Because the <br /> basalt sill to be mined is dry, no water losses will occur from the resource during mining. <br /> Dust will be controlled by water. Additional dust mitigation on roadways includes bi-annual or <br /> as needed applications of magnesium chloride. Water will be used as needed to spot eliminate <br /> any problem dust areas and to be used in a spray bar during initial crushing. Any water required <br /> for all aspects of dust mitigation will be purchased from the City of Walsenburg and brought on <br /> site by an independent Operator. 40,000—50,000 gallons is a high and conservative estimate of <br /> purchased off site water to be brought on site daily, as needed. <br /> Bradford Mesa Quarry <br /> August 2019 G-4 <br />