Laserfiche WebLink
Deficiency Issues for a NOI <br />Silver Wing Mine, NOI P- 2011 -027 <br />Please provide the following information regarding sampling protocols and QA /QC for the <br />samples procured by CGI on June 29, 2011: <br />a. How were the samples handled prior to delivery to the laboratory? <br />b. Were the samples filtered in the field or in the laboratory? <br />c. Method of preservation of the samples. <br />d. Were pH and conductivity measured in the field or in the laboratory? If they were <br />measured in the field, please report the field measurements. <br />4. As shown by the data on the table, water quality of the Animas River degrades from <br />upstream to downstream of the Silver Wing Mine. Increases in the concentrations of <br />arsenic, boron, copper, lead, nickel, selenium, silver, uranium, zinc, calcium, magnesium, <br />potassium, and sodium occur from upstream to downstream of the Silver Wing Mine. <br />However, the contributions from the mine drainage of aluminum, antimony, barium, <br />beryllium, cadmium, cobalt, iron, manganese, molybdenum, silicon, fluoride, sulfate, <br />and conductivity were not detected at the downstream sample location. <br />Under the NOI, the Applicant intends to conduct the following activities: <br />• Investigate the sources of drainage and determine whether grouting or bulk - <br />heading is an option to reduce or stop the drainage; <br />• Collect an undisclosed quantity of samples; <br />• General and undefined site clean -up; <br />• Remove sludge from the sediment pond and bury the sludge in a trench <br />excavated into the existing waste rock stockpile. NOTE: according to a document <br />generated by the IMP, Reclamation Feasibility Report, Animas River Above <br />Eureka, October, 1999, the waste rock is a source of acid mine drainage. <br />Clearly, the proposed activities have potential to exacerbate the existing adverse impact <br />to the water quality of the Animas River from the Silver Wing Mine. Pursuant to Rule <br />3.1.6(1)(b), the Division requires the Applicant obtain a Colorado Discharge Permit <br />System (CDPS) permit from the WQCD, or a letter from WQCD stating that a CDPS <br />permit is not required. <br />5. As shown in the photos, the sediment pond is lined. Please describe how the liner will <br />be protected during excavation of the sediment. Please provide the existing dimensions <br />of the impoundment and the final dimensions of the impoundment after the sediment <br />has been removed. Please discuss repair and /or replacement of the liner in the event <br />the liner is compromised during clean -out of the sediment. <br />6. The application does not address the performance standards of Rule 3.1. Pursuant to <br />Rules 5.1.2(g) and 5.3.1(b), please address the applicable requirements of Rules 3.1.5(2), <br />(3), (5), (10), (11), 3.1.6 and 3.1.7. Please include a water monitoring plan sufficient to <br />establish baseline conditions for surface and ground water through five quarters of <br />sampling and analysis. The baseline sampling plan should include no less than eight sets <br />of samples approximately equally spaced through the 15 -month period. The baseline <br />3 <br />