DDW-2024-007284

154 EAST 14075 SOUTH  DRAPER, UTAH 84020
TEL: [phone]  FAX: [phone]
April 10, 2024
Mr. Russell Seeley
Utah Division of Drinking Water
P.O. Box 144830
Salt Lake City, Utah 84114-4830
Subject: Wall Brothers Well #1 (WS001), PWS# 25189, DDW File #13317 - Request for
Exception on Grout Sealing Requirements
Dear Mr. Seeley:
This exception request is prepared and submitted on behalf of Chris Wall, owner of Wall Brothers Well #1
(Well). The purpose of this letter is to request an exception to the grout seal rule requirements for the Well.
The rule exception is requested under rule R309-600-6 (6)(i) and related rule R309-515-6 (5)(iii) for the
certification process. This exception request is to allow a grout seal from 50 to 105 feet (total 55 feet) in
lieu of 100 feet due to equipment issues during construction that did not allow the Driller to complete the
seal.
Background Information. Pertinent background information for the exception request is attached, as
follows:
1. Loughlin Water Report – Well Sealing Observations
2. Driller’s Report (to date).
3. Grout Schematic (current)
The Loughlin Report documents the grout sealing that has occurred to date on the Well. The Driller’s report
provides the geologic log and as-built condition. On April 10th a video call with DDW was held to discuss
the project background and grouting problems. This exception request has been prepared based on that call.
Proposed Additional Work to Complete the Seal. The outer 12-inch casing cannot be removed because
it is grouted in place. The Driller will complete grouting between the 8-inch casing and the 12-inch casing
from 40 feet up to approximately 8 feet below ground surface to allow installation of a 5-foot pitless adapter.
A ¼-inch thick steel plate will be welded between the 8-inch ad 12-inch casings at ground surface. We
understand that DDW may assign additional Bac-T sampling requirements as part of the Operating Permit
for the Well.
Considerations Regarding the Current Seal. There are two hydrogeologic conditions to consider
regarding the effectiveness of the existing seal. The Driller’s Log (attached) indicates that clay and “mostly
clay” soils exist from a depth of 5 to 128 feet. The existing grout seal is at a depth of 50 to 105 feet and
covers 50 feet of this clayey interval. Therefore, the existing seal is placed adjacent to 55 feet of low
permeability clayey materials. The static water level in the Well is approximately 177 feet below ground
surface. Therefore, the water table at the Well site is significantly below the clay and clayey soils from 5 to
128 feet that protect the aquifer. The grout seal is in the vadose zone (unsaturated zone) about 70 feet above
Mr. Russell Seeley
April 10, 2024
Page 2
the water table. Pumping the well will not result in the potential to increase seepage or migration through
the annular grout seal because the grout seal is separated from the water table by dry unsaturated soils.
Thank you for your consideration of this exception request. Feel free to contact me, Christopher DeKorver,
or Chris Wall if you would like to discuss the exception request.
Sincerely,
Chris D. Mikell, P.G.
Hydrogeologist
Screen - Mills-knife Perforated Casing (steel) with 3/8-inch x 3.5-inch perfs,
4 per round at 1-foot vertical spacing.
Pitless Adapter (if installed) - Baker Monitor 8" ID Standard Pitless Unit
or equivalent. Pitless unit must be NSF 61 certified,meet Water
Systems Council Pitless Adapter Standard (PAS-97), and be installed
in accordance with R309-515-6 (10).
Notes:
Prior to the completion of the well, the driller shall retract and remove
the 12-inch casing completely out of the borehole for grout seal purposes.
FIGURE 3
CURRENT WELL CONSTRUCTION SCHEMATIC April 8, 2024
WALL BROTHERS WELL No. 1
NTS
P:\Wall Brothers Orchard\779-23-01 Wall Brothers Orchard Well PER and Specs\7.0 Specifications\Drilling\Figure 3 - Well Design.xls
Perforations/Screen - 190 ft to 230 ft,
openhole 230 to 263 ft
100 feet
100 FEET OF PERFORATIONS
PERFORATION/SCREEN INTERVAL
WITH 3/8-INCH PERFORATIONS
DEPTH LENGTH
Blank Casing +2 to 235 feet 237
263'
26
3
'
8" Dia Blank
Steel Casing
(0.250 inch Wall)
105'
6" Dia Mills-Knife Perforated Steel Casing
(0.250-inch wall), 3/8-inch x 3-inch perfs, 4
per round at 1-foot vertical spacing.
(190-230 ft bgs)
12" Dia Blank Steel Casing
(0.312 inch Wall)
10
5
'
6" Dia Open borehole
(235-263 ft bgs)
Neat Cement Grout Seal,
Certified by DDW Inspector
(50.5 -105 ft. bgs)
+2 Ft.
Note: If a pitless adapter is
installed the grout level will be
left approximately 10 ft below
ground surface and backfilled
with bentonite.
10
'
180'
8" Dia Blank
Steel Casing
(0.250 inch Wall)
190'
230'
235'
6" Dia Blank
Steel Casing
(0.250 inch Wall)
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177' (approx.)