1999-05-21_HYDROLOGY - M1999051 - Laserfiche WebLink

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ACTION BY: DISCUSSION • • • Well field; • Three evaporation ponds for wastewater which will include boiler and water treatment blowdown; and • Surface processing facilities The following also was discussed: • Approximately 60 acres will be disturbed; • The water storage pond will have a single liner (HDPE, PVC or equal); • The evaporation ponds will be double lined with a monitoring system; the liner will be HDPE, PVC or equal depending on compatibility with the wastewater; • During the pilot phase there will be six production /injection wells; over the life of the project there may be approximately thirty wells; one to two wells will be operated at a time; cavities will be approximately 2,500 feet deep; • Utilities will include electricity (probably from White River Electric Cooperative) and Natural Gas (Western Gas Supply Company or another similar gas company); the utility corridors have not been selected, but they will follow existing corridors as much as possible including the plant access road; and • The site area consists primarily of sagebrush and pinyon - juniper vegetation (white areas and green areas, respectively, on a USGS map). 8. A storm water pollution prevention plan will be developed. 9. Product will be trucked from the site, 2/3 of the product is expected to be trucked to the users, 1/3 is expected to go by rail to the users. 10. The site stratigraphy and relationship of the cavities to ground water was discussed. A diagram similar to the attached figure was drawn. The proposed area to be mined is below the saline zone well below the A and B Grooves which are potential sources of drinking water. The area to be mined is a dry formation. Solution mining cannot be conducted outside the nahcolite deposit in the halite or saline area because salts interfere with the process. 11. The formation is approximately 27 percent nahcolite with the remainder consisting mostly of oil shale. Thus, the solution mining will leave a large amount of rubble and subsidence is not expected. Also, there will be pillars between the cavities. 12. At the end of the project, material from the evaporation ponds will be removed and disposed in accordance with the then existing regulations. The pond liners then will be folded over and a liner cap will be placed over the ponds which will be left in place. The DMG discussed the following: Clark/ 1. Since the project will disturb more than 60 acres, a 112 Permit will be Raytheon required. The attached "Regulation (112) Operation Reclamation Permit Application Package" was provided. G: \L M W 178545.002\M I N 001. d oc