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'4?k <br /> NATURAL SODA <br /> Natural Soda LLC <br /> DS-4 to BG-8 (DS-4) (10H-C) <br /> Conversion from Dissolution Surface Aquifer Monitor Well to B-Groove Aquifer <br /> Monitor Well Summary Report <br /> Prepared for <br /> Natural Soda LLC <br /> By <br /> Daub &Associates, Inc. <br /> Summer 2016 <br /> Introduction <br /> The Natural Soda LLC (NS) DS-4 well was first completed in 2009 as a vertical rotary drilled and <br /> cored hole converted to a groundwater monitoring well, with a perforated monitoring interval <br /> from 1,877 to 1,917 feet GL in the L-5 Zone of the Parachute Creek Member of the Green River <br /> Formation in the central Piceance Creek Basin of Northwestern Colorado. The well is located <br /> on U.S. Department of the Interior, Bureau of Land Management 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 39.927762' North latitude, 108.351047' West longitude, referenced to NAD <br /> 83. The as-built ground elevation is 6,699.0 feet above mean sea level. Depths mentioned in <br /> the text are measured depths reported relative to ground level. In August of 2015, a video log <br /> run to investigate sampling problems revealed that the 4.5 inch casing had parted and was <br /> damaged in at least four places at 1,763.5, 1,783.1, 1,803.9, and 1,824.4 feet. The video log <br /> could not pass 1,825 feet due to casing offset caused by the parting at 1,824.4 feet, therefore <br /> the well was not evaluated below this depth. In July of 2016, the DS-4 well was converted from <br /> a Dissolution Surface Aquifer (DS) groundwater monitor well to a B-Groove Aquifer (BG) <br /> groundwater monitor well, and was renamed BG-8 (DS-4). <br /> The recompletion drilling contractor was Himes Drilling Company Inc. (Himes) based out of <br /> Grand Junction, Colorado. Himes used the Portadrill rotary rig number R-7 to convert the well. <br /> Himes worked in 12-hour day shifts and traveled to and from location from Rifle, Colorado <br /> daily. Jet West Geophysical Services out of Farmington, New Mexico, performed the <br /> perforation operations. D&P Water, Inc. (D&P), based out of Meeker, Colorado, provided water <br /> Daub&Associates, Inc. Page 1 of 5 July 2016 <br />