1999-08-23_HYDROLOGY - M1999051

• Permit No: M1999051
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/23/1999
• Doc Name: Surface & Ground Water Monitoring Plan
• From: TRC Hydro-Geo Consultants
• To: DRMS
• Media Type: D
• Archive: No

I • Surface and Ground Water Monitoring Plan •
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AmerAlia, Inc. — Experimental Pilot Plant - Nahcolite Project 99 -043P
Following is a brief description of the proposed monitoring wells:
3.1 Alluvial Aquifer Monitoring
AM— 1
AM -1 will be an alluvial monitoring well. Existing well, "84 Mesa Well" upstream of the
project facilities will be used for this monitoring site, if possible. If "84 Mesa Well" is not
suitable for monitoring, a new well will be installed near this location. This new well will be
designed to monitor the alluvial aquifer upstream of the Project facilities. The well will penetrate
the entire thickness of the alluvial sediments, with a screened interval in the bottom portion of
the saturated alluvium. The well will be constructed with 4 -inch, Schedule 40 PVC casing and
screen. The annulus of the screened interval will be packed with gravel or sand. A bentonite and
cement seal will be placed above the screened interval, as shown on Figure 2.
AM -2:
This monitoring well will be installed downstream of the Project facilities, including the
potential water supply well field, in the Yellow Creek alluvium. This well will be installed
downgradient of the Project site as shown on Figure 1. This well will monitor the affect of the
nahcolite recovery process and the water well pumping on the shallow alluvial ground water
system. The well will also monitor the surface /ground water relationship in Yellow Creek and
any potential impacts to this system. Well AM — 2 will be located upstream of any potential
impacts of other sodium producers east of the Rock School Lease Tract. The construction of this
well will be similar to that for well AM —1 (see Figure 2).
3.2 Bedrock Aquifers Monitoring
TH 75 -7A:
Well TH75 -7A was installed in 1975 by the USGS and completed in the Upper Aquifer. The
well is open from 157 feet to the total depth of 1,080 feet. It is recommended that TH75 -7A be
included in the ground water monitoring plan because limited water level and water quality data
are available for this well. The historical data will be beneficial for establishing baseline
information on the Project area. This well is located directly downgradient and approximately
1,200 feet east - northeast of the proposed production well field, and is considered a good location
for a ground water compliance monitoring well. It will be necessary to use a drilling rig to
investigate the current condition of this well, prior to including it in the Monitoring Plan. It is
recommended that a 5 -inch Schedule 80 PVC protective casing liner be installed in this well
approximately 100 feet below the static water. A submersible pump will then be installed in the
lined interval about 75 feet below static water level. The proposed construction of this well is
presented on Figure 3.
TH75 -7B:
This well was installed in 1975 by the USGS and completed in the Lower Aquifer and is
constructed with 6 5/8 -inch diameter casing to a depth of 1,183 feet. Bottom part of the well is
open from 1,183 to 1,498 feet. It is recommended that TH75 -7B be included in the ground water
monitoring plan because limited water level and water quality data are available for this well.
The historical data will be beneficial for establishing baseline information on the Project area. It
will be necessary to use a drilling rig to investigate the current condition of this well, prior to
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