2008-08-29_APPLICATION CORRESPONDENCE - C2008086

Home Browse Search

Gary Isaac CAM-Colorado, LLC August 29, 2008 Page 9 The potential exists for surface disturbances, waste pile leachate, and mine water discharge to eventually impact the East Salt Creek alluvium. The potential impacts and the probable hydrologic consequences cannot be determined without adequate baseline characterization of the East Salt Creek alluvium. At least one well in the adjacent area along East Salt Creek is permitted for domestic use and future domestic and agricultural use of the water is reasonably probable. There is no discussion of East Salt Creek alluvium baseline water quality or quantity provided in the PAP. The Division is concerned that the alluvial groundwater in the vicinity of East Salt Creek has not been adequately characterized and the required baseline data have not been provided. In accordance with Rule 2.04.7 please amend the application to include a description of the quantity and quality of groundwater within the East Salt creek Alluvium. Please provide baseline groundwater monitoring data for the East Salt Creek alluvium. If data have not already been established, then incorporate a plan for additional groundwater monitoring wells within the East Salt Creek alluvium and obtain both water quantity (hydraulic properties) and quality information. The Division recommends at least three additional monitoring points be established. Two should be located along East Salt Creek within the saturated alluvium (one up gradient and one down gradient) from the point where mine discharge may potentially enter the stream. One additional monitoring well should be located along the stream/mine water flow path downstream of the major disturbance areas. 25. On page 2.04-19, CAM states that the applicant drilled eleven geotechnical holes within the permit area and nine of the holes were dry. This is not consistent with information provided elsewhere in the PAP. The plan view shown on Map 8 indicates numerous exploration holes were drilled within the permit boundary and at least three of these were converted to bedrock monitoring wells (8-2-8, 8-3-10, and 7-34-7). Please clarify this discrepancy and revise page 2.04-19, if appropriate. 26. The lithologic logs for eight of the geotechnical holes drilled within the permit area are provided on Map 8 Cross Section A-A'. It would be helpful to have the logs of all drill holes and test borings showing the lithologic characteristics, physical properties and thickness of each stratum which may be impacted incorporated into the PAP. Please provide the logs for all drill holes and test borings drilled within the permit area and include them as an exhibit in Volume III of the PAP. 27. Please provide the lithologic logs for the bedrock groundwater monitoring wells (7-34-7, 8-2-8, and 8-3-10) and include them with the well completion diagrams in Volume III, Exhibit 3. 28. The Division notes an inconsistency between the information presented in the Draft Environmental Impact Statement (DEIS) versus the PAP with regard to the data