Maintenance of Seepage Control System, Waterbury Dam, Waterbury, Vermont RFP
|Agency:||State Government of Vermont|
|Level of Government:||State & Local|
|Posted Date:||Jul 27, 2020|
|Due Date:||Aug 5, 2020|
Maintenance of Seepage Control System, Waterbury Dam, Waterbury, Vermont
Release Date: July 27, 2020
Proposals Due: August 5, 2020
Contact for Proposals: R. Green ANR, Department of Environmental Conservation,
Financial Operations: Rachel.Green@vermont.gov
THE STATE WILL MAKE NO ATTEMPT TO CONTACT VENDORS WITH UPDATED INFORMATION. IT IS THE
RESPONSIBILITY OF EACH VENDOR TO PERIODICALLY CHECK http://www.vermontbidsystem.com FOR ANY
AND ALL NOTIFICATIONS, RELEASES AND AMENDMENTS ASSOCIATED WITH THE RFP.
Introduction and Purpose
The State of Vermont, Department of Environmental Conservation, is seeking priced proposals for the documenting,
testing, and cleaning of dewatering wells; the replacement of dewatering well pumps and transducers, the cleaning and
camera inspection of conduit filter drain outlet pipes; and the cleaning and camera inspection of toe drain; located at
Waterbury Dam in Waterbury, Vermont. See the attachments for location of the dam and dewatering wells and various
This request for proposal describes the existing dam, the scope of work, required contents of proposals, and the
procedure and criteria for final selection.
Up to $240,000 is available for the period of performance.
Scope of Work
DEC seeks proposals for the following:
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TASK 1 – MOBILIZATION AND REMOVAL OF WELL COMPONENTS AND
INSPECTION OF PUMPS IN DEWATERING WELL 1, DEWATERING WELL 2,
DEWATERING WELL 3, DEWATERING WELL 4, DEWATERING WELL 5 (DW 1, DW 2,
DW 3, DW 4, DW 5)
1.1 Contractor shall notify the State at least 7 days before mobilizing so the dewatering wells can be disabled.
1.2 Remove pumps, transducers, and all piping and stainless-steel coupons from the wells to be cleaned. See
Figure 1-1 below. The working condition of each pump and transducer shall be documented and agreed
to by the Contractor and State prior to removal. Components shall be stored or handled in a safe manner
or location. Components damaged by the Contractor shall be replaced at the Contractor’s expense.
Splicing or cutting of transducer cable is NOT allowed.
Figure 1-1: Typical Dewatering Well Detail (Record Drawings)
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1.3 Inspect and digitally photograph pumps and describe color and texture of film on the pump and drop pipe.
Identify the well that the pump was removed from with clear signage in the photographs. Provide prints
of each image showing biofilm buildup on each pump in the inspection/cleaning report.
TASK 2 – WATER TESTS (DW 1, DW 2, DW 3, DW 4, DW 5)
2.1 Water samples from each well must be taken before pumps are disabled by the State. Contractor
must notify State at least 48 hours prior to water sampling so access to the wells can be scheduled. Pump
each well for 5 minutes before taking water sample. Measure and record temperature, pH, and Oxygen
Reduction Potential of the water from each well.
2.2 Have a qualified laboratory perform the following tests for water chemistry for each sample: Field:
Conductivity, pH, ORP, Temperature (C); Lab: Total Alkalinity (as CaCO3), Hardness (Total as CaCO3),
Solids Total Dissolved, Calcium ion concentration (as CaCO3), Iron concentrations (including Fe+2,
Fe+3, and total), Total Magnesium, Silica ion concentration (as SiO2). Include results of water tests in
the inspection/cleaning report described below.
TASK 3 – PRE AND POST CLEANING VIDEO INSPECTION (DW 1, DW 2, DW 3, DW 4, DW 5)
3.1 Pre-cleaning video inspections shall be performed before the initial slug testing and before addition of
chemicals to wells. Post-cleaning video inspections shall be performed after the wells have been
neutralized and before the post-cleaning slug test.
3.2 Video the screens of wells with a downhole color camera (500 lines/inch minimum resolution) equipped
with dive lights. The video well record shall include an image of the depth in feet below the measuring
point (the well riser top elevations). Also obtain 8 still images (4 pre-cleaning and 4 post-cleaning) at
equal spacing in the screened section in each well at a resolution that will allow enlargement up to 8-inch
x 10 inch without loss of detail. Provide digital files of video well records electronically in a format that
can be played on personnel computer programs such as Windows Media Player. Include 4 inch by 6-inch
color prints of each still image in the inspection/cleaning report described below. One copy of digital files
for still images shall also be furnished electronically.
TASK 4 – INITIAL SLUG TESTING (DW 1, DW 2, DW 3, DW 4, DW 5)
4.1 Initial slug testing shall begin after all scheduled initial video inspections have been completed and at least 5
days (120 hours) after all pumps are disabled by the State.
4.2 Measure depth to bottom of well to nearest 0.1 feet and calculate bottom elevation using well riser top
elevations shown on Table 4-1. Install a pressure transducer with an on-board datalogger that records at
logarithmic time intervals (In-Situ Level Troll 700 or equal, 30 pounds per square inch gauge (psig) full scale)
about 20 feet above the bottom of the well with communication cable. Record exact depth of nose of
transducer below top of well riser pipe to nearest 0.01 feet. Transducer shall be programmed to collect data
at true logarithmic intervals starting exactly when the slug is planned to be released into the well. Using a
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water level indicator, measure and record initial depth to water level in well from the top of the well riser pipe
to the nearest 0.01 feet and record the clock time of this measurement to the nearest minute.
Casing Pipe Diameter (in.)
Top of riser elevation
Top of screen elevation
Bottom of Pump elevation
Bottom of screen elevation
Bottom of Boring elevation
Table 4-1 Dewatering Well Elevations
Elevations are in feet, NGVD29
4.3 Fill a tank with 152 gallons (for DW 1 through DW 4) or 66 gallons (for DW 5) of water. Record the water level
in the tank. The tank shall be fitted with a 4-inch butterfly valve and 4inch diameter pipe or rigid-wall hose
sufficiently long to reach the well, plus a 90-degree elbow to direct the discharge from the tank into the well.
Tank shall be designed to produce a discharge curve equal to that shown in Figure 4-1 within a tolerance of ±
1% of the volume of water remaining in tank at any given elapsed time.
Water Remaining in Tank after Opening Valve
Elapsed Time in Seconds
Volume vs Elapsed Time (152 gallons Initially)
Figure 4-1 Water Remaining in 152-gallon Slug Test Tank Versus Elapsed Time After Opening 4-in. Valve
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4.4 Open 4-inch diameter valve at the exact clock time at which the level transducer/datalogger is programmed
to start recording, recording the exact clock time at which the valve is opened. Calculate and report the
volume of water discharged into the well.
4.5 The slug test for each well shall be 8 hours in length. The frequency of readings shall be, at a maximum: 1
second for the first 10 minutes, 15 seconds for the next 20 minutes, 1 minute for the next 30 minutes, and 5
minutes for the remaining 420 minutes. Upload the slug test data from the datalogger before removing it
from the well. Plot the data for each individual well, using the format shown in Figure 4-2 as a template.
Review the slug test data plot to evaluate whether or not the data appear to be reasonable. Rerun the slug
test if the data plot does not appear to be reasonable. The filenames shall identify the well number, date, and
start time of the test. The data and plots (Excel spreadsheet acceptable) shall be part of the final report
4.6 Slug testing shall be performed on only one well at a time, and slug testing shall not be started on a well that
has not been tested until at least 8 hours have elapsed after introduction of a slug to any other well.
Record of Slug Test
Well DW 1 - Waterbury Dam
Time Since Start of Test, minutes
Figure 4-2 Typical/sample Slug Test Curve
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