DERR-2024-006563

SPA 1 and SPA 1A Monitoring
Northwest Oil Drain Canal,
Salt Lake City, UT
July 6, 2023

Page B-1 Dalton, Olmsted & Fuglevand, Inc.
SPA 1 and SPA 1A Monitoring
Northwest Oil Drain Canal,
Salt Lake City, UT

Inspection Date July 6, 2023
Inspection Time 0900 - 1400
Inspection Type Second year following PRSCP
Inspector David Cooper - DOF

SITE OBSERVATIONS

Weather
• Partly Cloudy, 78F, winds from the north at approximately 13 MPH.

Fences and Gates
• Fences and gates were observed to be in generally good condition with no damage or breaches.
The north gate of SPA 1 was open at the time of our visit (providing access only to Tesoro property,
not accessible to the general public). The South gate of SPA 1A was open with access to the Salt
Lake City Water Reclamation Facility (SLCWRF) property (the SLCWRF likewise not accessible to
the public). External gates otherwise accessible to the public were secured from public entrance
by direct locking. Warning signs were in place at all gates.
• The warning sign at the south gate of SPA 1 was partially obscured by graffiti upon arrival and
replaced with a clean/new sign prior to departure.

SPA 1 Site Use
• SPA 1 was generally vacant with the exception of a few steel brackets in the SW corner and half a
dozen stockpiles of gravel borrow in the NE corner. It appeared to be generally unused.

SPA 1 Condition
• During our visit, SPA 1 appeared to be in good condition, the subgrade appeared dense and non-
yielding with no significant ruts or gouges.
• On November 14, 2023, Diamond Land Surveyors LLC measured the ground surface elevations at
each of the seven monitoring locations (coordinates presented on Figure B3) in order to
determine the difference between the ground surface elevation and the elevation of the marker
layer at each location. The elevation of the marker layer was established during the September
2022 monitoring event.
• Based on the survey data, SPA 1 Cover thickness ranged from 0.62’ to 1.58’, all greater than the
trigger criteria of 0.5’. Cover thicknesses are listed on Table B1 and shown on Figure B3.

SPA 1 Adjacent Canal
• The Canal adjacent to SPA 1 appeared to be free of any sheen.

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-2 Dalton, Olmsted & Fuglevand, Inc.

SPA 1A Condition
• Spa 1A appeared to be generally undisturbed and in good condition. The subgrade soils were
generally vegetated with a variety of weeds and brush and no obvious evidence of human
disturbance. The area subgrade consists of a general depression and is separated from the canal
by an adjacent roadway dike that is higher in grade by at least three feet, therefore there is no
potential for erosion into the canal.

SPA 1A Adjacent Canal
• The Canal adjacent to SPA 1A appeared to be free of any sheen.

Photographs
• Standard Photograph locations and orientation are represented for SPA 1 on Figure B-1 and for
SPA 1A on Figure B-2.
• The August 2023 Photographs of SPA 1 (locations P1 through SP8) and SPA 1A (locations Pa1- Pa8)
along with canal adjacent photographs SP2 and SP12 are attached.

CORRECTIVE ACTIONS

Corrective actions:
• The graffiti obscured sign at the SPA 1 south gate was replaced with a new one.

ATTACHED
Table B1. SPA 1 Cover Thickness Measurements
Table B2. Sheen Monitoring Observations in Canal Adjacent to SPAs
Photographs: Standard Photographs at SPA 1 (P1 through P8) and SPA 1A (P1a through P8a)
Photographs: Standard Photographs of Canal Adjacent to SPAs
Figure B-1 SPA 1 Site Map
Figure B-2 SPA 1A Site Map
Figure B-3 SPA Cover Thickness

REFERENCES
DOF, 2021, NWOD Post Removal Site Control Plan (PRSCP), September 2021

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-3 Dalton, Olmsted & Fuglevand, Inc.
Table B1. SPA 1 Cover Thickness Measurements (see attached Figure B-3 for location of measurements).
Date of Measurements: 11/14/23
Station Thickness
Gravel Cover
(ft.)*
Description and Comments
T1 1.58 Very dense gravelly sand atop orange non-woven geotextile
T2 0.80 Very dense gravelly sand atop orange non-woven geotextile
T3 1.45 Very dense gravelly sand atop orange non-woven geotextile
T4 1.02 Very dense gravelly sand atop orange non-woven geotextile
T5 0.62 Very dense gravelly sand atop orange non-woven geotextile
T6 0.64 Very dense gravelly sand atop orange non-woven geotextile
T7 0.82 Very dense gravelly sand atop orange non-woven geotextile
* Calculated cover thickness based on Diamond Land Surveying LLC survey on November 14, 2023.

Table B2. SHEEN MONITORING OBSERVATIONS IN CANAL ADJACENT SPA
Date of Monitoring: 8/8/23
Location Sheen
Type*
~Area
(ft2)
Description Apparent Source
SPA 1 None
SPA 1A None
* Sheen Type: Oil, Scum, Sheen (brown, rainbow, silver), None
• Oil - Visible free oil on the water surface or coating on debris.
• Scum - Accumulated film that is likely biological in origin.
• Sheen - Sheens are described based on their color in accordance with the NOAA Shoreline Assessment
Manual1. Colors used to describe sheens, from thickest to thinnest, are brown (0.003mm thick), rainbow
(0.0003mm thick), and silver (0.00007mm thick).
• None - No sheen observed.

1 National Oceanic and Atmospheric Administration. 2000. Shoreline Assessment Manual. HAZMAT Report No.
2000-1. Seattle, Washington.
NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-4 Dalton, Olmsted & Fuglevand, Inc.

SPA 1 PHOTOGRAPHS

Photo P1: SPA 1 South Fence Line and Gate.

Photo P2: SPA 1 North Fence Line and Gate.
NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-5 Dalton, Olmsted & Fuglevand, Inc.
PHOTOGRAPHS (Cont.)

Photo P3: SPA 1 East Fence Line

Photo P4: SPA 1 NWOD Canal Line looking north.

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-6 Dalton, Olmsted & Fuglevand, Inc.

PHOTOGRAPHS (Cont.)

Photo P5: SPA 1. Looking to center of site from NW corner of SPA

Photo P6: SPA 1. Looking to center of site from NE corner of SPA

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-7 Dalton, Olmsted & Fuglevand, Inc.

PHOTOGRAPHS (Cont.)

Photo P7: SPA 1. Looking to center of site from SW corner of SPA

Photo P8: SPA 1. Looking to center of site from SE corner of SPA

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-8 Dalton, Olmsted & Fuglevand, Inc.
SPA 1A PHOTOGRAPHS

Photo Pa1: SPA 1A South Fence Line and Gate.

Photo Pa2: SPA 1A North Fence Line and Gate.

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-9 Dalton, Olmsted & Fuglevand, Inc.
PHOTOGRAPHS (Cont.)

Photo Pa3: SPA 1A East Fence Line

Photo Pa4: SPA 1A West Fence Line.

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-10 Dalton, Olmsted & Fuglevand, Inc.

PHOTOGRAPHS (Cont.)

Photo Pa5: SPA 1A. Looking South near Station 1052 W

Photo Pa6: SPA 1A. Looking South near Station 1052 E

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-11 Dalton, Olmsted & Fuglevand, Inc.

PHOTOGRAPHS (Cont.)

Photo Pa7: SPA 1A. Looking North near Station 1049 W

Photo Pa8: SPA 1A. Looking North near Station 1049 E

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-12 Dalton, Olmsted & Fuglevand, Inc.
PHOTOGRAPHS of CANAL ADJACENT to SPAs

Photo SP2: SPA 1 Canal Looking downstream from Segment 1 inlet area.

Photo SP12: Canal adjacent to SPA 1A Looking downstream.

NWOD Canal Working Group SPA 1 and SPA 1A Monitoring
Salt Lake City, Utah Northwest Oil Drain Canal
December 18, 2023

Page B-13 Dalton, Olmsted & Fuglevand, Inc.
SPA 1 Sign Replacement

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Limits of SPA-1 Regraded Area
Photographic Marker (location where
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Source: Aerial photography: Google Earth Pro, 7/18/2019.
T1
T2
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T1 Approximate location of cover thickness measurement
Post Remediation Monitoring
SPA 1 SITE MAP AND STANDARD
PHOTO LOCATIONS
INSPECTION DATE: 09/22/22
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Pa1 South Fence Line and Gate
Pa2 North Fence Line and Gate
Pa3 East Fence Line
Pa4 West Fence Line
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Pa6 Looking South near Station 1052 E
Pa7 Looking North near Station1049 W
Pa8 Looking North near Station 1049 E
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Source: Aerial photography: Google Earth Pro, 7/18/2019.

Post Remediation Monitoring
SPA 1A SITE MAP AND STANDARD
PHOTO LOCATIONS
INSPECTION DATE: 09/22/22
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T1 (1001)
T2 (1002)
T3 (1003)
T4 (1004)
T5 (1005)T6 (1006)
T7 (1007)
Surface Elev. 4219.32'
CoverThickness 1.58'
Indicator Marker Elev. 4217.74'
Surface Elev. 4219.03'
Cover Thickness 0.80'
Indicator Marker Elev. 4218.23'
Surface Elev. 4219.10'
Cover Thickness 1.45'
Indicator Marker Elev. 4217.65'
Surface Elev. 4219.25'
Cover Thickness 1.02'
Indicator Marker Elev. 4218.23'
Surface Elev. 4219.07'
Cover Thickness 0.62'
Indicator Marker Elev. 4218.45'
Surface Elev. 4218.81'
Cover Thickness 0.64'
Indicator Marker Elev. 4218.17'
Surface Elev. 4218.88'
Cover Thickness 0.82'
Maker Layer Elev. 4218.06
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Scale in Feet
LEGEND
Monitoring Point Survey Location
Fence
Limits of SPA-1 Regraded Area
Source: Aerial photography: PlexEarth Imagery, Sept. 2022.
SPA 1
1007
2023-11 MONITORING LOCATIONS
NOTES:
1. Monitoring location and surface elevations
surveyed by Diamond Land Surveying LLC
November 2023.
2. Marker layer elevation based on cover
thickness measured by DOF in test pits on
September 22, 2022.
ID Easting Northing
1001 1522257.5 3452748.0
1002 1522291.3 3452572.8
1003 1522415.9 3452584.8
1004 1522389.3 3452440.5
1005 1522383.8 3452281.1
1006 1522492.2 3452290.4
1007 1522460.1 3452026.2
Horizontal Coordinates: Utah State Plane
North (NAD83) Feet