Laserfiche WebLink
Natural Soda, Inc. <br />Plug and Abandonment Report <br />Dissolution Surface/Subsidence Monitor Well 93-2M <br />Prepared for <br />Natural Soda, Inc. <br />By <br />Daub & Associates, Inc. <br />Summer 2010 <br />Introduction <br />The Natural Soda, Inc. 93-2M was a vertically drilled hydrologic and subsidence <br />monitoring well, drilled in the Green River Formation in the Piceance Creek Basin of <br />western Colorado. The well is located on U.S. Department of the Interior, Bureau of <br />Land Management property in the NE quarter of the SW quarter of Section 26, Township <br />1 South, Range 98 West, in Rio Blanco County, CO. The as-built location is <br />39.933353236° North latitude, 108.361759081 ° West longitude, referenced to NAD 27. <br />The as-built ground elevation is 6,659.3 feet above mean sea level. Depths mentioned in <br />the text are reported relative to ground level. <br />The primary objective of the 93-2M was to monitor the Dissolution Surface (DS) Aquifer <br />in the inactive solution mining Panel 1 and act as a subsidence monitoring well. After <br />initial drilling operations, the 93-2M had a cast iron bridge plug (CIBP) installed at a <br />depth of 1898 ft and the casing was perforated from 1876 to 1897 ft. On November 25, <br />2009, a video log was run in the well to determine a possible cause for water level rising <br />from 572 feet to 496 feet within a year. At a depth of 466 ft, a pinhole breach in the <br />casing was noted and a very minor amount of water was continuously entering the hole <br />through the leak. The well was scheduled for plugging and abandonment (P&A) due to <br />the casing breach. <br />The P&A contractor was Sanjel (USA) Inc. (Sanjel), based out of Rifle, Colorado. A <br />multi-purpose coiled tubing unit (CTU) was used to P&A the well. Sanjel worked in 12- <br />hour day shifts and traveled to and from location daily. <br />Jet West Geophysical, LLC (Jet West) based out of Farmington, New Mexico ran the <br />video log and performed the perforation operation prior to the P&A. <br />Daub & Associates, Inc. (D&A), based in Grand Junction, Colorado, engineered the P&A <br />and secured the contract. A geologist from D&A was on-site during all phases of the <br />abandonment operation. D&A geologists performed the following duties: <br />• provided QA/QC of all operations <br />• maintained a chronological log of daily activities <br />• coordinated contractor operations <br />Daub & Associates, Inc. Page 1 of 4 93-2M Plug and Abandonment Report