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Day One at the Clarks, NE, site. The Geoprobe® R&D team used a 66 5CPT machine to collect Hydraulic Profiling Tool (HPT) logs near the two
public water supply wells. Steve Knobbe (left), Project Engineer, and Richard Holmgren, Direct Image® Specialist, work at the HPT1 location. |
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The Clarks South PWS well field is located in the flood plain of the Platte River in Central Nebraska. The Village Board of
Clarks worked with the local grocery store owner to install a reverse osmosis filtration system to provide “treated” bottled
water to the residents that wished to participate. The restaurant and convenience store also installed similar systems. |
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Tom Christy, Geoprobe® Vice President, (left)
explains downhole information displayed realtime
on the FC5000 Field Instrument to Dana
Peterson, with Tagge Engineering Consultants
in Holdrege, NE, as HPT logs are taken near the
Clarks South PWS well. Tagge Engineering was
investigating options for overcoming the high
levels of uranium in the PWS wells. Richard
Holmgren (far left) operated the 6625CPT
machine as the logs were collected. |
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(l to r) Wes McCall, Geoprobe®
Environmental Geologist, reviews HPT logs and
monitoring well installation plans with Tom
Christopherson, Tony Martinez, and Bob Byrkit,
all with the Nebraska Department of Health and
Human Services in Lincoln, NE. (The bottle of
suntan lotion in the foreground was a coveted
commodity under the hot September sun.) |
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Brent Kejr, Geoprobe® Product Engineer, uses 2.25 in. OD rods under the Geoprobe® 8040DT
machine during the monitoring well installation process. Some of the casings were driven to 118
feet depending upon the information obtained from the HPT logs. |
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Brent Kejr, Geoprobe® Product Engineer, uses the new 8040DT to set 0.75 in. prepacked screen monitoring wells. Eight of the nine prepacks were installed in
two days. The 8040DT machine drove the 2.25 in. casing to 118 feet in less than 30 minutes. |
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David Jundt, Water Supply Specialist with the Nebraska Department of
Health and Human Services, collects a sample for uranium from the South
4-in. test well. A Geoprobe® Electric Actuator draws samples through the
downhole Mechanical Bladder Pump which were then taken to the NEDHHS
lab for analysis. |
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Wes McCall, Geoprobe® Environmental Geologist and
Project Coordinator, checks formation collapse through
the ID of the well casing prior to grouting the well. |
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(left) Patrick Richmeier,
Product Engineer, uses the
new GS2250 Grout Machine
to tremie grout the nominal
0.75 in. prepacked screen
monitoring wells using a
nylon grout hose. Maximum
depth for grouting was about
100 feet.
(right) 3/8-in. OD grout
tubing is inserted down 2.25
in. OD probe rods as bottomup
grouting is completed at
well A1. |
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The Geoprobe® R&D team shares lunch at
the well field site. |
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The Geoprobe® Electric Actuator was
used to develop the prepacked screen wells with
PE tubing and downhole tubing check valve. |
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High turbidity development water is shown
from initial surging and purging. After initial development,
the Geoprobe® Mechanical Bladder
Pump was installed downhole to work with the
Electric Actuator for low flow sampling. |
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Flow from the downhole mechanical bladder
pumps was directed through the small flow
cell (left), and water quality parameters (DO,
ORP, pH, Specific conductance, and temperature)
were monitored with a YSI Model 556
water quality meter (right). Water quality
parameters were stabilized before samples
were collected. Dissolved oxygen (DO) was less
than 0.2 mg/L, and turbidity was below 10 NTU
for all samples. |
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