REP09352 - Laserfiche WebLink

Home Browse Search

i ~ Mr. Dick Gamewell June 22, 1982 Page - Two - Colorado Department of Health - Permits Division Comment No. 1 - "The 100 year flood plain mapping is still not accurate. Don Simpson has discussed this matter with Dick Gamewell before and has indicated that the mapping along the contour lines is not consistent. Therefore, several of the structures at the mine may be in the flood plain area that do not appear on the present map." Response to Comment No. 1 - Since the date of this comment, Cotter filed a revised flood plain analysis with the Radiation Control and Water Quality Control Divisions of the Colorado Department of Health, The Colorado Water Conservation Division and the Denver Urban Drainage and Flood Control District. The latter two agencies reviewed Cotter's flood plain analysis and maps carefully for the Jefferson County Com- missioners. All elements of the analysis and flood protection design were agreed to by these two agencies. In addition, please note that all existing and proposed structures to be regulated by the radioactive materials license will be protected from the flood plain. Comment No. 2 - "The emergency response procedure for a loss of the volume of liquid in the thickener tank should include a containment area capable of handling the entire volume. If the leak from the tank occurs at a rate greater than what the pumps can handle the spill might enter Ralston Creek. Also, if either pump is not functioning properly the liquid could enter the Creek." Response to Comment No. 2 - The emergency response procedure described in Section 5.3 of the application was developed for the purpose of precluding the contents of the ore sorter thickener tank from reaching Ralston Creek in the event of a spill. Comment No. 3 - "The License contains a stipulation for collection and containment of surface runoff at the ore crusher-sorter and water treat- ment plant but not at the waste dump areas. Why haven't these areas been included?" Response to Comment No. 3 - The waste dump areas fall within the juris- diction of the Colorado Division of Mined Land Reclamation. Referring to the MLRB permit for this site (MLRB File No. 77-300, Cotter is required by that permit to construct a runoff control ditch above the waste dump during the relcamation of the mine site. In addition, a soil analysis was conducted by Tom Colbert and Associates using soil samples collected between the'•wa' ump and Ralston Creek in October, 198. The chemical analysis of these samples indicated no evidence of radio- nuclide runoff or infiltration into these soils as a result of precipi- tation runoff from the waste dump.