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.?k <br />NATURAL SODA <br />Natural Soda, Inc. <br />Plug and Abandonment Report <br />Subsidence Monitoring Well 88 -1 <br />Prepared for <br />Natural Soda, Inc. <br />By <br />Daub & Associates, Inc. <br />2013 <br />Introduction <br />The Natural Soda, Inc. (NSI) 88 -1 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 NE 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 39.99351000° North latitude, 108.36081000° West longitude, referenced to <br />NAD 27. The as -built ground elevation is 6,647.5 feet above mean sea level. Depths mentioned <br />in the text are measured depths reported relative to ground level (GL). The primary objective <br />of the 88 -1 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 />Northwest Ready Mix, based out of Meeker, Colorado, provided cement for the plugging <br />operations. <br />Daub & Associates, Inc. Page I of 3 88 -1 Plug and Abandonment Report <br />