Laserfiche WebLink
Logan Wash Mine Annual Report <br />Permit No.: M-1977-424 <br />daylights and discharges into the channel. The 4-inch diameter plastic pipe was buried at a 2 to <br />5-ft depth, depending on bedrock and grade needed for gravity drainage. <br />4.5 Other Mine-Water Plumbing <br />The retort water and L-1 mine water (Outfall 001) valves in the Lower Bench Vault were <br />plumbed to enable combining the Outfall 001 mine water with retort water that discharges to the <br />evaporation pond. This was done to accommodate additional flow of water to the pond for use by <br />Occidental Oil and Gas Company (OOGC) for gas-drilling make-up water. Combined flow was <br />implemented on June 14`x', and later re-segregated because OOGC decided not to use the pond <br />water. <br />4.6 Construction of Soil Barrow Area <br />TR. No. 7, Soil Amendment Reclamation, was submitted to DMG on August 10`", 2005 and <br />approved on August 1 1'~', 2005. TR No. 7 described the excavation of the Soil Barrow Area and <br />application of soil amendments to specific mine areas. The Soil Barrow Area is located in N1/4 <br />NE1/4 NEl/4, 525, T7S, R97W, immediately north of Logan Wash Road in a broad vegetated <br />drainage or Swale. Approximately 4,400 cubic yards of soil material was excavated and <br />deposited as a six-inch minimum layer on the "Lower Dump Toe" area, upper portion of the <br />Lower Access Road, the Upper Bench, Upper Bench Road, and Research Mine Bench. <br />Construction of the Soil Barrow Area resulted in a new surface disturbance of approximately 0.65 <br />acres that was later revegetated (see above). <br />4.7 Well Abandonment <br />Wells LW-108, LW-112, and LW-242 were abandoned during the reporting period. Well LW- <br />108 is located on the Upper Bench. Well LW-112 is located in Dry Gulch at the OOSI and BLM <br />property boundary. Well LW-242 is located in Logan Wash, approximately 4.2 miles east of <br />County Road 45. The Colorado Division of Water Resources approved the abandonment of Well <br />LW-242 by plugging with bentonite chips instead of tremied cement because the water column <br />length was relatively short. The table below summarizes well parameters and the abandonment <br />materials used. <br />Well Abandonment Information <br /> Total Inside <br /> Date Depth Diameter Depth to Materials <br />We11ID Abandoned ft in water ft Plu in Material Used <br />LW-108 1 l/03/05 1,103 6.0 230.3 Neat cement 217 sks, 55 <br />(# 19575) bbls <br />LW-112 12/08/05 75.25 4.25 66 Bentonite plug; 5 ft 9.5 sks <br /> cement surface lu bentonite <br />LW-242 12/09/05 177.6 6.0 145.2 Bentonite plug; 6 ft 45 sks <br /> cement surface lu bentonite I <br />4.8 Remaining Monitoring Wells <br />Wells not scheduled to be abandoned include Well LW-22, LW-32, LW-45, and LW-] 16. These <br />wells are to be used by Mr. Ned Prather, a local rancher, for stock-watering purposes. In addition <br />Well LWCW-lA will remain as adown-gradient compliance monitoring well. <br />Western Water & Land, Inc. 7 <br />