2010-08-27_REPORT - M1983194

• Permit No: M1983194
• IBM Index Class Name: REPORT
• Doc Date: 8/27/2010
• Doc Name: Elevated Conductivity
• From: Daub & Associates, Inc.
• To: DRMS
• Email Name: THM
• Media Type: D
• Archive: No

Well Development and Groundwater Sampling
After completion, the BG-5 was developed by adding groundwater from the A-Groove Aquifer (hauled
from the 90-1 water supply well) to the BG-5 well and circulating the water across the open hole interval
from a depth of 1604 to 1645 feet (B Groove stratigraphic interval). The drill rods were used to try to air-
lift the groundwater from the casing. The small annular space between the casing and the drill rods
prevented the groundwater from being efficiently evacuated from the well. Limited success was achieved
by initially air lifting from shallower depths and incrementally air lifting from progressively deeper depths.
This may have resulted in drilling fluids remaining in the area of the B-Groove Aquifer and/or in the
immediate area near the well bore. Typically drilling fluids that are high in TDS are used when
drilling/coring near and below the Dissolution Surface. Elevated conductivity levels were noted in samples
collected during the May and June sampling events.
NSI used a 1000 CFM compressor and air lifted well bore fluid to develop the well. Field parameters
including water level, temperature, pH, and conductivity along with groundwater samples were collected
on a monthly basis beginning on October 7, 2009. As of June 23, 2010, a total of nine sample sets had
been collected and analyzed. Refer to tables 1 and 2 for the field and analytical data. Beginning in
February of 2010, the conductivity in the groundwater samples began to increase slightly from the apparent
baseline of 2500 µmhos/cm (January, 2010) to a high of 5740 µmhos/cm in June of 2010. Both the July 28
and August 2, 2010 samples showed a marked decrease of the previously elevated numbers to near baseline
conditions. Figures 1 through 7 are graphic illustrations of the analytical results for the BG-5 well. Piper
and Stiff diagrams for the BG-5 are presented as figures 8 and 9. Notes regarding specific tables or figures
may be found following Figure 9.
Natural Soda, Inc.
BG-5 Field Sampling Events
Manual DCS Water
Sampler's Conductivity temp
Date Water Level Level (ft pH o Remarks
Initials (µmhos/cm) C
(ft bgs) bgs)
Aug-09 522.46
Sep-09 522.46 2540 8.84 15.2
Oct-09 ?? _
521.09 2480 ? 8.70 13.6
Nov 09 521.10 521.52 2296 8.96 18.0

Dec 09 520.89 520.13 2333 9.21 9.2
Jan-10 522.16 520 27 2418 9.09 8.0
Feb 10 522.74 520.45 2850 9.00 10.5 _
Mar-10 522.83 520.70 2838
_ 8.97
-_
_
_ 13.5
?
Apr-10 -
521.59 519.88 2879 9
2i 11.3
May-10 520.81 519.33 4933
- 9.19 10.6
Jun-10 522.27 520.27 --? 5492 8.90 14.9
Sample tubing was disconnected and retrieved
7/28/2010 TJ and reset sampling pump at same depth.

7/29/2010 TJ 255.6 9.04 17.7 meter found to be out of calibration
resample after meter calibration, the meter
7/29/2010 TJ 1525 9.09 14.6
remains an issue _
8/2/2010 TJ 2575 8.97 15.2 A new, calibrated meter was used
8/13/2010 ES _ 2700 8.66 15.05
8/17/2010 TJ 522.84 2658 8.68 14.4
Table 1: BG-5 field sampling results and events.
Daub & Associates, Inc. BG-5 GW Sampling Anomaly 8-24-10 rgd
Printed: 8/24/2010 Page 2 of 15