2013-02-01_REPORT - M1983194 ‎(2)‎

• Permit No: M1983194
• IBM Index Class Name: REPORT
• Doc Date: 2/1/2013
• Doc Name: ANNUAL FEE/REPORT
• From: OPERATOR
• To: DRMS
• Email Name: THM
• Media Type: D
• Archive: No

4.4 Geotechnical Program
NSI monitors two (2) time - domain - reflectometry monitor wells, the 4A -5M and 3M -TDR.
There has been no indication of subsidence near the 4A -5M well since installation. The
3M -TDR well was drilled late in 2003. Two of the four TDR cables in 3M -TDR subsidence
well appear to have water infiltration damage. In 2012, readings were again taken and
data was gathered from cables two and three. In addition to the monthly NSI readings, the
installation contractor also collects data quarterly; no significant ground movement has
been detected near the 3M -TDR well since the cables were installed.
4.4.1 Subsurface Subsidence Geophysical Logging
The initial gamma ray and casing collar locator logs (GR/CCL) in the 12H production
pair was done while drilling the wells in April /May of 2012. This data will be used as a
baseline for future subsidence geophysical log monitoring of this well pair.
4.4.2 Surface Subsidence Monitoring
No surface subsidence survey was conducted in 2012, the next surface subsidence
survey will occur in 2013. No new surface monuments were added to the existing 11
monuments located throughout the well field in 2012. There are plans to add surface
monuments in 2013 to monitor the 12H and 13H well pairs.
4.5 Water Well Pumpage
In 2012, approximately 40.6 million gallons of water was pumped from water supply
wells 90 -1 and WSW -2 with an average of 77.06 gpm. The total pumpage from WSW -2
was 37.3 million gallons, and the total pumpage from 90 -1 was 3.3 million gallons.
5.0 Environmental Monitoring and Protection
5.1 Hydrology Monitoring
5.1.1 Introduction
NSI's hydrology monitoring program concentrates on ground water, as there are no
perennial streams or springs located on or near the sodium leases. The USGS stream
gauging station - monitoring program is conducted, with NSI support, to provide regional
surface stream flow data on Yellow and Piceance Creeks.
The hydrology- monitoring plan is designed to determine impacts of NSI's solution mining
operations on underground sources of drinking water, as designated by the US EPA.
Refer to Figure 3 for the locations of existing monitor wells. A thorough discussion of
historical water monitoring data has been presented in previous Annual Reports and will
not be repeated in this report.
Through 2012, dewatering did not affect the Perched aquifer. The A- Groove aquifer
water level was affected locally by pumping from the water supply well.
Daub & Associates, Inc. 13 NSI Annual Report 2012