Laserfiche WebLink
Paul Banks and Associates, LLC <br />locations) for which they have an access easement with the landowner (Stonewall <br />Springs Quarry, LLC). These wells previously supplied two pivot irrigation systems on <br />the property. There are no known off -site wells owned by others located within 600 feet <br />of the mining limits. Wells in the area are shown on Exhibit C -1. Due to the high <br />transmissivity of the alluvial aquifer, off -site wells are not expected to be affected by <br />dewatering at the mine site. A gravel pit located approximately 3 / -mile to the west has <br />been dewatering continuously for two years with no apparent or known impact to nearby <br />wells. <br />Four ground water monitoring wells have been installed on the property to establish <br />baseline conditions and to monitor the impact of dewatering. The proposed monitoring <br />well locations are also shown on Exhibit C -1. <br />Runoff From Disturbed Ground <br />Storm water runoff will be directed into either the mine pit or a settling pond at the <br />southern portion of the property. Exhibit C -3 shows the location of the proposed settling <br />pond. A Stormwater Management Plan (SWMP) has been developed and implemented <br />for the property, and a discharge permit has been obtained prior to site disturbance, as <br />required by the Colorado Department of Public Health and Environment (CDPHE). <br />Dewaterinq Water Discharge <br />Dewatering water will be transmitted and discharged to the Arkansas River pursuant to <br />an approved Colorado Discharge Permit System (CDPS) General Permit for Sand and <br />Gravel Mining and Processing from the Colorado Department of Public Health and <br />Environment (CDPHE). <br />The outfall will be designed to minimize erosion, dissipate the velocity of the flow and <br />spread out the flow so that impacts to the bed, bank and riparian areas of the Arkansas <br />River are minimized. The outfall structure has a Nationwide Permit from the U.S. Army <br />Corps of Engineers. The location of the dewatering pipe and outfall are shown on Exhibit <br />C -3. <br />Project Water Requirements <br />The following table summarizes water demand for the proposed operation. <br />St. Barbara Sand and Gravel Mine 10031 <br />Pete Lien & Sons, Inc. 19 June 15, 2011 <br />