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lAk <br />NATURAL SODA <br />Natural Soda, Inc. <br />Plug and Abandonment Report <br />Subsidence Monitoring Well 90 -2 <br />Prepared for <br />Natural Soda, Inc. <br />By <br />Daub & Associates, Inc. <br />2013 <br />Introduction <br />The Natural Soda, Inc. (NSI) 90 -2 was a vertical rotary drilled well. Originally drilled as a vertical <br />sodium bicarbonate production well, it was recompleted as a subsurface subsidence monitoring <br />well. The well was drilled in the Parachute Creek Member of the Green River Formation in the <br />Piceance Creek Basin located in Northwestern Colorado. The well is located on U.S. <br />Department of the Interior, Bureau of Land Management (BLM) property in the SE quarter of <br />the SW quarter of Section 26, Township 1 South, Range 98 West, in Rio Blanco County, CO. The <br />as -built location is 39.992766° North latitude, 108.36312° West longitude, referenced to NAD <br />27. The as -built ground elevation is 6,691.5 feet above mean sea level. Depths mentioned in <br />the text are measured depths reported relative to ground level (GL). The primary objective of <br />the 90 -2 was to monitor for subsurface subsidence in the mined interval of Panel 1. The well <br />was scheduled for plugging and abandonment (P &A) due to cessation of mining operations in <br />Mine Panel 1 and its advanced age. <br />The P &A contractor was Red Rock Well Service (RRWS) based out of Blanding, Utah. RRWS <br />used workover rig number RR -3 to P &A the well. RRWS worked in day shifts and traveled to <br />and from location from Rifle, Colorado daily. <br />Meeker Sand & Gravel, based out of Meeker, Colorado, provided cement for the plugging <br />operations. <br />Daub & Associates, Inc. (D &A), based in Grand Junction, Colorado, engineered the P &A and <br />secured the contract. A geologist from D &A was on -site during all phases of the abandonment <br />operation, provided field coordination - supervision, and quality control and confirmation of the <br />P &A activity. The D &A geologist performed the following duties: <br />• provided QA /QC of all operations <br />• maintained a chronological log of daily activities <br />• coordinated contractor operations <br />• provided cost tracking and reporting <br />Daub & Associates, Inc. Page 1 of 3 5H Plug and Abandonment Report <br />