DERR-2024-011719

Jennifer Nelson <[e-mail]>
Fwd: Stantec - DVR Ski Rail GPR utility-locate
1 message
Jennifer Nelson <[e-mail]>Mon, Oct 28, 2024 at 4:54 PM
To: Jennifer Nelson <[e-mail]>
From: Russell, John <[e-mail]>
Date: Fri, Oct 25, 2024 at 4:03 PM
Subject: Stantec - DVR Ski Rail GPR utility-locate
To: David Bird <[e-mail]>
Hello Dave - Yesterday, I observed GPRS conduct a ground-penetrating radar (GPR) utility-locate of our PWP-
proposed, 19 soil test boring/well locations. Two items for your consideration…and we presume that this should not
impact the scheduling of our upcoming site characterization (week of Nov. 11th):

1) GPR found no signs of any buried oil/water separator tank/system at the two 8-in. dia., steel manhole covers. Upon
opening the two manholes w/a crowbar, I found a 4-in. dia. PVC pipe beneath each cover. Each PVC pipe was open
and totally dry to completion depths of 8 feet below grade. It appears that the two pipes may be sewer cleanout
access ports. We will drill the adjacent proposed soil test boring, as originally planned/proposed.

2) Per attached original PWP “Figure 5B”…and….attached “gpr-amended,” updated Figure 5B:

(2A) We are going to have to move one (1) proposed soil test boring (eastern-most subsurface soil gas boring) several
feet east of the originally-proposed location, due to too many utilities in the vicinity of the original location.

(2B) Likewise, we must relocate two (2) proposed well locations:

Originally, we had proposed one well within each of the two different landscaped areas located near the SE and E
sides of the property. However, we cannot drill in either of the two landscaped areas along the SE and E side of the
property…….waaay too many utilities at/near the road….and….a drill rig will not be able to access either landscaped
island area because the areas are bermed too high and covered by large boulders/cobbles.

A comparative analysis of the 2 attached figures identifies where I propose relocating the 2 wells….basically, moving
them each about 50 feet or so from each original location. I believe that the relocations will actually better satisfy our
needs for appropriate spacing for determining groundwater flow direction, anticipating a North to NEerly flow pattern,
etc……w/more emphasis on monitoring of the NE corner of the property, incl. downgrade of the entire UST area, etc.
I would appreciate your reviewing the 2 figures and letting me know if you prefer another arrangement --- keeping in
mind however, that we have GPR-cleared each of the original 19 boring locations – and the 2 amended well locations,
clearing utilities to a radial distance of 10 feet around each boring, etc. Thank you, John

John G. Russell, III CPG
10/28/24, 4:55 PM State of Utah Mail - Fwd: Stantec - DVR Ski Rail GPR utility-locate
https://mail.google.com/mail/u/0/?ik=8ae212892f&view=pt&search=all&permthid=thread-f:1814199330219861871%7Cmsg-a:r-813433088783003556…1/2
Sr. Hydrogeologist, Environmental Risk Manager

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Stantec

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2 attachments
Figure-5B utilities.pdf
179K
gpr-amended_Figure-5b utilities.pdf
163K
10/28/24, 4:55 PM State of Utah Mail - Fwd: Stantec - DVR Ski Rail GPR utility-locate
https://mail.google.com/mail/u/0/?ik=8ae212892f&view=pt&search=all&permthid=thread-f:1814199330219861871%7Cmsg-a:r-813433088783003556…2/2

Figure 5B
Estimated Locations of
Buried Utility Corridors

Ski Rail, LLC
LEGEND
Precise utilities in corridors are unknown:
Sanitary sewer
Water
Electrical
Natural gas
Cable

One Inch approxs. 50 feet

Date: 7/2024 Project No.: 203723752
Drawn By: JR First Review: TG Second Rev: RP
T2S, R4E Section 9 Summit County UT
NAD 1983 UTM Zone 12N

(Unidentified) two 8-in. dia. manhole covers with
8-ft. deep, 4-inch dia. PVC pipes: appear to be
sewer cleanouts.

Small floor-drain network inside building that is
believed to grade into sanitary sewer.
Utility locations estimated by means of identification of abovegrade utility assets and visible lineaments in the asphalt surface.
Utility corridors and abovegrade assets will be investigated further, prior to the drilling project, as Stantec will contract a Ground-
Penetrating Radar (GPR) study of the site. White utilities are unidentified utility corridors that may include multiple utilities.
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Proposed Soil Test Boring
Boring includes Subsurface Soil
Gas samples at 2-ft. & 5-ft. depths
Proposed Sub-Slab Soil Gas sample

Proposed Groundwater
Monitoring Well
SS