DERR-2024-011125

Tesoro #46 GWM Report 09/24 Page 1
ATLAS

358 East 700 South, B518
Salt Lake City, Utah 84102
Office: 801.935-4917
www.oneatlas.com

October 1, 2024

Mr. Kevin Beery
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, Utah 84114-4840

SUBJECT: Groundwater Monitoring Report (September 2024)
Tesoro #46
3596 West 3100 South
West Valley, Utah
Facility ID #4001074
UST Release Site LXX

Dear Mr. Beery:

Please find attached a copy of the September 2024 Groundwater Monitoring Report for the
above referenced site.

INTRODUCTION

In December 2023 Atlas Technical Consultants (Atlas) over saw a microbe and nutrient injection
project at the site. The primary objective of the corrective actions was to reduce the petroleum
constituent concentrations in the direct vicinity of MW-2 and MW-7 to below Utah Department of
Environmental Quality (?UDEQ) Tier I Screening Levels using the BOS-200® Trap-and-Treat
technology (BOS-200® Microbial and Nutrient Injection). In February 2024, a post injection
groundwater sampling event was conducted. During the event it was discovered that monitoring
wells MW-2 and MW -7 were almost completely filled with the BOS 200 slurry. Upon discussion
with the UDEQ project manager, MW -2 and MW -7 were abandoned and replaced with wells
MW -2R and MW -7R (Monitoring Well Installation Report dated June 18, 2024).

On September 9, 2024, Atlas conducted a groundwater sampling event at the site (Figure 1).
The sampling was performed on behalf of the Utah Department Environmental Quality, Division
of Environmental Response and Remediation (DERR), under Work Assignment LXX-22.

FIELD PARAMETER WELL PURGING PROCEDURES AND CHEMICAL ANALYSIS

The approved Work Plan for Groundwater Monitoring and Reporting included the collection of
groundwater elevation data from all monitoring wells and the sampling of monitoring wells MW -
2R, MW -7R, and MW-14.

Prior to well purging, groundwater depth was measured in each well using an electronic water
level/free product interface probe. No free product was observed in any of the monitoring wells
sampled. The water level/free product interface probe was decontaminated between each well
with an Alconox detergent wash and tap water rinse.

Tesoro #46 GWM Report 09/24 Page 2
ATLAS
Following field parameter measurements, the monitoring wells were purged using new, factory-
sealed disposable PVC bailers. All the monitoring wells sampled were purged three well casing
volumes or until dry. Groundwater removed from the wells was poured on the asphalt surface
and allowed to evaporate. After the purging process, the wells were allowed to recharge to
within 95 percent of the pre-purge water level before groundwater samples were collected. The
samples were transferred to appropriate containers and immediately placed on ice in an
insulated cooler and then transported under chain-of-custody documentation to a Utah-certified
laboratory for analysis. The groundwater samples were analyzed for methyl t-butyl ether,
benzene, toluene, ethyl benzene, total xylenes, naphthalene (MBTEXN) using EPA Method
8260; and for TPH as gasoline (TPH-GRO) and TPH as diesel (TPH-DRO) using EPA Method
8015.

The September 2024 groundwater elevation data were utilized to prepare a groundwater
contour map (Figure 2) for the site. The groundwater elevation data indicate a gradient beneath
the site of 0.005 ft/ft to the northwest measured between MW -5 and MW -9. Groundwater
elevation data collected from MW-11 and MW -12 were not utilized to construct the groundwater
gradient map because they are separated hydrologically form the site due to the presence of a
deep underground utility corridor present beneath 3600 West Street. The groundwater elevation
data are summarized in Table 1.

The September 2024 groundwater analytical data indicate the benzene Tier I Screening Level of
0.30 mg/L was exceeded in MW -7R (0.369 mg/L) and MW -14 (0.635 mg/L). No other petroleum
hydrocarbon constituents were measured above their respective Tier 1 Screening Levels in any
of the other wells sampled. Benzene was measured in MW -2R at a concentration of 0.164.
Benzene has historically been measured above its Tier I Screening Level in MW -1, MW -2 and
MW -7.

Concentrations of TPH-GRO were detected in all 3 wells sampled. TPH-GRO was measured in
MW -2R at a concentration of 1.740 mg/L, in MW -7R and a concentration of 3.500 mg/L, and in
MW -14 at a concentration of 3.830 mg/L. Concentrations of TPH-DRO were measured in MW -
2R (0.284 mg/L), MW -7R (1.330 mg/L), and MW-14 (2.960 mg/L). All of the concentrations of
TPH-GRO and TPH-DRO measured are below the Tier I Screening Level of 10 mg/L. The
laboratory results are summarized in Table 1 and a copy of the laboratory report is included in
Appendix A.

CONCLUSIONS AND RECOMMENDATIONS

Review of the post-injection groundwater laboratory results indicate that the microbe and
nutrient injection effort was successful at reducing groundwater impacts in the vicinity of MW -2R
and MW -7R since the July 2024 sampling event. However, the September 2024 results indicate
an increase in the benzene concentration in MW-7R to above the Tier 1 Screening Level. The
results also indicate that the benzene concentration in MW -14 continues to be above the Tier 1
Screening Level. The increased benzene concentration in MW -14 is likely due to the
mobilization of impacted groundwater during the injection event. No other petroleum
hydrocarbon constituents were measured above their respective Tier 1 Screening Levels in any
of the other wells sampled.

The September 2024 sampling event is the first under Work Assignment LXX-22. The next
sampling event is scheduled for December 2024.

Tesoro #46 GWM Report 09/24 Page 3
ATLAS
Our services consist of professional opinions and recommendations made in accordance with
generally accepted geotechnical and environmental engineering principles and practices. This
warranty is in lieu of all other warranties either expressed or implied. Should you have any
questions, please do not hesitate to call us at [phone].

Sincerely,

ATLAS
Olaf Questereit Jim Coletta, P.G.
Senior Technician Branch Manager
Utah Certified PST Consultant

Cc: Mr. Dennis Haggard, Hardy Enterprises Inc. (e-copy)

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TABLES

Page 1 of 5
SAMPLE ETHYL-NAPH-
LOCATION DATE BENZENE TOLUENE BENZENE XYLENES THALENE MTBE TPH-GRO TPH-DRO DO TEMP.DTW FP WTE
TOC (ft.)MM/DD/YY (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(Co )(feet)(feet)(feet)
Initial Screening Level 0.005 1.0 0.7 10 0.7 0.2 1.0 1.0
RBCA Tier 1 Screening 0.3 3.0 4.0 10 0.7 0.2 10 10
MW-1 09/28/07 3.60 0.025 J 0.280 0.299 0.079 J <0.120 13.0 1.5 NM NM 9.33 0.00 84.33
93.66 04/07/08 2.00 0.013 0.110 0.1002 0.082 0.0056 11.0 1.0 NM NM 8.28 0.00 85.38
10/21/08 3.10 0.018 J 0.070J 0.032 J 0.140 <0.10 8.0 1.2 NM NM 9.64 0.00 84.02
03/19/09 1.60 0.0029 J 0.053 0.0268 J 0.063 0.0017 J 4.0 1.7 NM NM 9.11 0.00 84.55
09/23/09 0.860 0.0037 0.084 0.0147 0.100 0.00092 J 2.5 3.6 NM NM 9.41 0.00 84.25
03/22/10 0.40 13.1 9.28 0.00 84.38
09/13/10 0.120 0.011 0.0096 0.0022 0.008 <0.001 0.42 0.52 0.39 13.6 9.02 0.00 84.64
03/02/11 0.362 <0.005 0.037 <0.015 0.025 Jlo 0.007 0.968 F 1.0 M,X,F, Jhi 0.66 12.7 8.20 0.00 85.46
11/28/11 0.530 <0.01 0.039 <0.03 0.049 <0.01UJ 1.45 F <1 M,X,F 0.89 16.5 8.61 0.00 85.05
03/21/12 0.249 <0.001 0.038 <0.003 0.009 Jhi <0.001 0.781 F <1 M,X,F 0.54 13.0 8.39 0.00 85.27
99.59 11/07/12 0.234 <0.01 0.069 <0.03 0.034 <0.01 0.543 <1 M,X,F 0.78 16.3 11.91 0.00 87.68
04/30/13 1.31 <0.02 0.237 0.062 0.126 <0.02 4.11 <1 M,X,UJ,F 0.63 12.9 10.45 0.00 89.14
11/12/13 0.108 <0.005 0.021 <0.015 <0.01 <0.005 0.353 F 1.0 M,X,F 0.50 19.8 12.33 0.00 87.26
06/23/15 2.31 0.033 0.205 0.097 0.338 <0.005 4.48 3.1 0.42 16.1 10.40 0.00 89.19
09/15/16 1.46 0.020 0.057 0.055 0.399 <0.005 3.49 3.0 0.33 19.5 11.32 0.00 88.27
10/31/17 1.61 <0.125 <0.125 <0.125 0.482 <0.050 2.10 3.5 0.36 19.5 11.68 0.00 87.91
01/30/19 1.28 0.020 0.043 0.050 0.360 <0.005 2.76 3.0 0.77 15.9 10.43 0.00 89.16
04/09/20 0.835 0.0188 0.0336 0.0480 0.345 <0.100 4.090 3.490 0.61 14.3 10.93 0.00 88.66
06/09/21 0.319 0.00830 0.0375 0.0149 0.0877 <0.00100 2.15 2.92 NM NM 10.53 0.00 89.06
07/12/22 0.262 <0.012 <0.012 0.014 0.203 <0.005 J-LOW 0.959 2.0 NM NM 10.98 0.00 88.61
02/27/24 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 NM NM 9.11 0.00 90.48
06/14/24 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0365 B,J 0.0769 B,J NM NM 9.90 0.00 89.69
09/09/24 NM NM 10.76 0.00 88.83

MW-2 09/28/07 2.00 0.037 J 0.520 0.408 0.120 J <0.120 9.5 0.98 NM NM 9.52 0.00 84.33
93.85 04/07/08 0.470 0.0061 J 0.002 J 0.0208 J 0.042 0.0017 J 8.1 1.1 NM NM 8.38 0.00 85.47
10/21/08 0.830 0.037 0.150 0.095 0.160 <0.005 5.1 1.0 NM NM 9.78 0.00 84.07
03/19/09 0.960 0.015 0.068 0.033 0.140 0.00094 J 2.1 1.4 NM NM 9.24 0.00 84.61
09/23/09 2.200 0.033 0.160 0.0678 0.220 0.0011 6.2 1.8 NM NM 9.68 0.00 84.17
03/22/10 0.75 13.5 9.64 0.00 84.21
09/13/10 3.600 0.170 0.280 0.980 0.056 <0.001 13 0.63 0.82 13.7 9.22 0.00 84.63
03/02/11 0.706 <0.02 0.402 0.927 0.093 Jlo <0.02 10.5 F <1 M,X,F 0.53 12.5 8.37 0.00 85.48
11/28/11 2.00 0.013 0.019 0.066 0.036Jhi <0.01 3.39 F <1 M,X,F 0.99 17.1 8.75 0.00 85.10
03/21/12 5.620 0.010 0.085 0.059 0.082 Jhi <0.001 9.79 F <1 M,X,F 0.52 12.6 8.78 0.00 85.07
99.78 11/07/12 0.007 0.005 <0.005 <0.015 <0.01 <0.005 <0.05 F <1 M,X,F 0.94 16.8 12.17 0.00 87.61
04/30/13 2.04 <0.02 0.039 <0.06 0.052 <0.02 2.94F <1 M,X,F 0.32 12.9 10.37 0.00 89.41
11/12/13 0.485 <0.02 <0.02 <0.06 <0.04 <0.02 0.681 F <1 M,X,F 0.44 19.0 12.59 0.00 87.19
06/23/15 9.34 0.047 0.177 0.112 0.303 <0.005 11.5 2.7 0.44 17.4 10.38 0.00 89.40
09/15/16 1.96 0.009 0.006 0.008 0.034 <0.005 2.8 1.2 0.31 19.8 11.54 0.00 88.24
10/31/17 4.37 <0.125 <0.125 <0.125 0.290 <0.050 4.66 2.7 0.32 19.6 11.88 0.00 87.90
01/30/19 4.44 0.035 0.041 0.051 0.212 <0.005 5.90 2.4 0.61 15.2 10.28 0.00 89.50
04/09/20 3.190 0.0371 0.0690 0.0725 0.495 0.00118 10.700 2.720 0.39 14.0 10.40 0.00 89.38
06/09/21 2.00 0.0289 0.0484 0.0505 0.356 0.00133 7.91 3.49 NM NM 9.76 0.00 90.02
07/12/22 0.975 QM-4x 0.020 0.028 0.032 0.286 <0.005 J-LOW 2.74 2.4 NM NM 10.53 0.00 89.25
02/27/24 NM NM NM NM NM
06/04/24 NM NM NM NM NM
MW-2R 06/14/24 0.0214 0.000388 J 0.000836 J 0.000459 J <0.00500 0.000416 J 0.780 0.0453 B,J NM NM 10.23 0.00 89.56
99.79 09/09/24 0.164 0.00135 0.00785 0.00388 0.00226 J 0.000592 J 1.740 0.284 B NM NM 10.97 0.00 88.82

MW-3 09/28/07 1.80 0.046 J 0.210 0.172 0.370 <0.120 8.9 0.80 NM NM 9.66 0.00 84.41
94.07 04/07/08 1.70 0.029 J 0.170 0.092 J 0.140 <0.10 7.9 1.7 NM NM 8.65 0.00 85.42
10/21/08 1.80 0.033 0.093 0.0886 0.240 0.00038 J 6.8 1.7 NM NM 9.92 0.00 84.15
03/19/09 1.40 0.014 0.038 J 0.0403 J 0.085 J <0.10 3.8 2.0 NM NM 9.43 0.00 84.64
09/23/09 1.00 0.013 0.078 0.0264 0.160 <0.001 4.0 1.4 NM NM 9.70 0.00 84.37
03/22/10 0.75 15.0 9.32 0.00 84.75
09/13/10 0.200 0.0026 0.022 0.011 0.063 <0.001 1.5 1.5 0.71 15.3 9.30 0.00 84.77
03/02/11 0.010 <0.001 <0.001 <0.003 0.003 Jlo <0.001 0.055 F 1.0 M,X,F, Jhi 1.01 13.6 8.00 0.00 86.07
11/28/11 0.008 <0.001 0.001 <0.003 0.002 <0.001UJ <0.05 F <1 M,X,F 0.67 18.1 8.80 0.00 85.27
03/21/12 0.013 <0.001 <0.001 <0.003 <0.002 <0.001 0.104 F <1 M,X,F 0.51 13.6 8.93 0.00 85.14
100.00 11/07/12 0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.05 F <1 M,X,F 0.59 17.2 12.20 0.00 87.80
04/30/13 0.007 <0.001 <0.001 <0.003 <0.002 <0.001 0.080F <1 M,X,UJ,F 1.25 13.5 10.38 0.00 89.62
Not Sampled
Not Sampled
Not Sampled
WEST VALLEY, UTAH
TABLE 1
GROUNDWATER ANALYTICAL and ELEVATION DATA
TESORO #46
3596 WEST 3100 SOUTH
Not Sampled, filled with BOS 200 Slurry
Not Sampled
Decommissioned. Replaced by MW-2R
Page 2 of 5
SAMPLE ETHYL-NAPH-
LOCATION DATE BENZENE TOLUENE BENZENE XYLENES THALENE MTBE TPH-GRO TPH-DRO DO TEMP.DTW FP WTE
TOC (ft.)MM/DD/YY (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(Co )(feet)(feet)(feet)
Initial Screening Level 0.005 1.0 0.7 10 0.7 0.2 1.0 1.0
RBCA Tier 1 Screening 0.3 3.0 4.0 10 0.7 0.2 10 10
WEST VALLEY, UTAH
TABLE 1
GROUNDWATER ANALYTICAL and ELEVATION DATA
TESORO #46
3596 WEST 3100 SOUTH
MW-3 11/12/13 NM NM 11.93 0.00 88.07
Cont.06/23/15 NM NM 9.73 0.00 90.27
09/15/16 0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 1.9 1.17 22.1 6.52 0.00 93.48
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 1.20 20.2 11.78 0.00 88.22
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.60 16.4 9.93 0.00 90.07
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 0.958 2.47 14.0 8.85 0.00 91.15
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 2.28 B NM NM 10.48 0.00 89.52
02/27/24 NM NM 8.80 0.00 91.20
06/14/24 NM NM 10.46 0.00 89.54
09/09/24 NM NM 10.99 0.00 89.01

MW-4 09/28/07 0.022 0.0011 J 0.011 0.00557 J 0.0078 <0.005 0.5 J 0.75 NM NM 9.62 0.00 84.13
93.75 04/07/08 0.0016 J <0.005 0.00039 J <0.005 0.0019 J <0.005 0.035 J 0.25 NM NM 8.51 0.00 85.24
10/21/08 0.0076 0.0003 J 0.0014 J 0.00046 J 0.00069 J <0.005 <0.5 0.57 NM NM 9.89 0.00 83.86
03/19/09 0.00082 J <0.005 0.00017 J <0.005 0.0028 J <0.005 0.017 J 0.39 NM NM 9.32 0.00 84.43
09/23/09 0.0058 <0.001 0.0012 0.00119 J <0.001 <0.001 0.29 0.51 NM NM 9.88 0.00 83.87
03/22/10 1.75 11.7 9.82 0.00 83.93
09/13/10 1.7 12.5 9.62 0.00 84.13
03/02/11 1.7 11.4 8.61 0.00 84.62
11/28/11 0.003 0.001 <0.001 <0.003 <0.002 <0.001 0.053 F <1 M,X,F 0.87 16.6 8.91 0.00 84.84
03/21/12 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 0.070 F <1 M,X,F 2.20 11.8 8.98 0.00 84.77
99.59 11/07/12 <0.005 <0.005 <0.005 <0.015 <0.01 <0.005 <0.05 F <1 M,X,F 0.51 16.4 12.09 0.00 87.50
04/30/13 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.05 F <1 M,X,F 1.53 11.9 10.90 0.00 88.69
11/12/13 NM NM 12.62 0.00 86.97
06/23/15 NM NM 11.09 0.00 88.50
09/15/16 <0.002 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0 0.48 16.2 11.73 0.00 87.86
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 1.49 18.6 12.17 0.00 87.42
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 2.74 12.9 10.95 0.00 88.64
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0382J 0.0829 J 2.67 10.4 11.36 0.00 88.23
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 0.551 NM NM 11.30 0.00 88.29
02/27/24 NM NM 9.10 0.00 90.49
06/14/24 NM NM 11.10 0.00 88.49
09/09/24 NM NM 11.39 0.00 88.20

MW-5 09/28/07 0.001 J 0.00035 J 0.0004 J 0.00071 J 0.0066 0.018 0.11 0.41 NM NM 9.29 0.00 84.32
93.61 04/07/08 0.00042 J <0.005 <0.005 <0.005 0.00065 J 0.013 0.048 J 0.16 NM NM 8.15 0.00 85.46
10/21/08 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.5 0.12 NM NM 9.55 0.00 84.06
03/19/09 0.00021 J <0.005 <0.005 <0.005 <0.005 0.0082 0.018 J 0.32 NM NM 9.01 0.00 84.60
09/23/09 0.00018 J <0.001 0.0002 J 0.00098 J 0.00058 J 0.0045 0.063 J 0.74 NM NM 9.39 0.00 84.22
03/22/10 0.48 13.9 9.35 0.00 84.26
09/13/10 0.58 14.2 8.99 0.00 84.62
03/02/11 0.86 13.2 8.16 0.00 85.45
11/28/11 <0.001 <0.001 <0.001 <0.003 <0.002 0.004Jlo <0.005 F <1 M,X,F 0.69 17.9 8.67 0.00 84.94
03/21/12 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 0.097 F <1 M,X,F 0.87 13.6 8.65 0.00 84.96
99.54 11/07/12 <0.001 <0.001 0.001 0.007 <0.002 <0.001 <0.05 F <1 M,X,F 0.72 17.3 12.01 0.00 87.53
04/30/13 0.002 <0.001 <0.001 <0.003 <0.002 <0.001 <0.05 F <1 M,X,UJ,F 0.68 13.9 10.24 0.00 89.30
11/12/13 NM NM 12.20 0.00 87.34
06/23/15 NM NM 9.87 0.00 89.67
09/15/16 <0.002 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0 0.60 21.2 10.88 0.00 88.66
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.65 20.1 11.12 0.00 88.42
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.31 16.3 9.85 0.00 89.69
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 0.000111 J <0.100 <0.100 1.31 14.4 10.12 0.00 89.42
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 0.210 B NM NM 9.62 0.00 89.92
02/27/24 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 NM NM 8.89 0.00 90.65
06/14/24 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0410 B,J 0.162 B NM NM 9.82 0.00 89.72
09/09/24 NM NM 10.53 0.00 89.01

MW-6 03/21/12 1.84 <0.005 0.197 0.124 0.409 Jhi <0.005 11.0 F 1.2 M,X,F 0.67 13.1 8.63 0.00 90.71
99.34 11/07/12 0.884 <0.01 0.029 0.030 0.100 <0.01 3.87 F <1 M,X,F 0.53 16.8 12.00 0.00 87.34
04/30/13 0.765 <0.02 <0.02 <0.06 0.142 <0.02 4.20F <1 M,X,F 0.46 13.1 10.84 0.00 88.50
11/12/13 0.835 <0.02 <0.02 <0.06 0.064 <0.02 4.07 F 1.9 M,X,F 0.26 18.4 12.35 0.00 86.99
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Page 3 of 5
SAMPLE ETHYL-NAPH-
LOCATION DATE BENZENE TOLUENE BENZENE XYLENES THALENE MTBE TPH-GRO TPH-DRO DO TEMP.DTW FP WTE
TOC (ft.)MM/DD/YY (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(Co )(feet)(feet)(feet)
Initial Screening Level 0.005 1.0 0.7 10 0.7 0.2 1.0 1.0
RBCA Tier 1 Screening 0.3 3.0 4.0 10 0.7 0.2 10 10
WEST VALLEY, UTAH
TABLE 1
GROUNDWATER ANALYTICAL and ELEVATION DATA
TESORO #46
3596 WEST 3100 SOUTH
MW-6 06/23/15 0.322 0.007 0.024 0.016 0.064 <0.005 1.38 1.5 0.36 15.4 10.99 0.00 88.35
Cont.09/15/16 0.706 0.008 0.005 0.009 0.156 <0.005 2.85 1.5 0.23 18.3 11.78 0.00 87.56
10/31/17 0.644 <0.012 <0.012 <0.012 0.188 <0.005 <0.125 1.8 0.49 19.3 11.98 0.00 88.22
01/30/19 0.095 <0.012 <0.012 <0.012 <0.012 <0.005 2.56 <1.0 0.22 14.8 11.11 0.00 88.23
04/09/20 0.215 0.00487 0.0111 0.00821 0.0553 0.00113 3.190 1.180 1.05 13.5 11.48 0.00 87.86
06/09/21 0.192 0.00591 0.0123 0.00802 0.0783 0.00235 3.35 2.59 NM NM 11.29 0.00 88.05
02/27/24 0.070 <0.012 <0.012 <0.012 <0.012 <0.005 0.754 <1.0 NM NM 10.11 0.00 89.23
06/14/24 0.108 0.00269 0.000754 J 0.00155 J 0.0108 0.0012 2.370 1.370 NM NM 10.99 0.00 88.35
09/09/24 NM NM 11.13 0.00 88.21

MW-7 03/21/12 1.39 0.023 0.079 0.069 0.269 0.003 6.35 F <1 M,X,F 0.98 14.1 8.46 0.00 90.75
99.21 11/07/12 1.26 Jcal 0.026 0.196 0.081 0.312 0.009 5.80 F <1 M,X,F 0.69 17.1 11.79 0.00 87.42
04/30/13 1.49 0.029 0.068 0.082 0.317 0.015 6.57F <1 M,X,F 0.63 13.8 10.65 0.00 88.56
11/12/13 1.59 0.023 0.158 0.072 0.243 <0.02 3.31 F 1.2 M,X,F 0.36 20.1 12.02 0.00 87.19
06/23/15 1.54 0.026 0.084 0.072 0.384 <0.005 3.72 2.7 0.41 16.8 10.73 0.00 88.48
09/15/16 0.886 <0.005 <0.005 <0.005 0.024 <0.005 1.01 2.0 0.36 20.7 11.50 0.00 87.71
10/31/17 1.02 <0.012 <0.012 <0.012 0.189 <0.005 <0.125 1.8 0.32 19.9 11.55 0.00 87.66
01/30/19 0.836 0.018 0.018 0.030 0.141 0.009 2.34 1.8 0.31 16.8 10.80 0.00 88.41
04/09/20 0.685 0.0181 0.00801 0.0325 0.0914 0.0112 6.040 2.220 0.67 14.3 11.03 0.00 88.18
06/09/21 0.761 0.0217 0.00843 0.0396 0.150 0.00832 6.57 3.74 NM NM 10.95 0.00 88.26
07/12/22 0.645 0.026 <0.012 0.043 0.167 <0.005 J-Low 2.58 2.1 NM NM 11.30 0.00 87.91
02/27/24 0.013 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 1.6 NM NM 8.91 0.00 90.30
06/04/24 NM NM NM NM NM
MW-7R 06/14/24 0.0871 0.00222 0.00239 0.00370 0.01060 0.000605 J 3.660 1.260 NM NM 10.53 0.00 89.26
99.79 09/09/24 0.369 0.00615 0.0163 0.00779 0.00542 0.00185 3.500 1.330 NM NM 10.98 0.00 88.81

MW-8 03/21/12 0.248 <0.001 0.082 0.557 0.043 Jhi <0.001 1.88 F <1 M,X,F 0.68 12.4 9.27 0.00 90.63
99.90 11/07/12 0.035 <0.001 0.009 <0.003 <0.002 <0.001 0.552 F <1 M,X,F 0.94 16.2 12.48 0.00 87.42
04/30/13 0.003 <0.001 <0.001 <0.003 <0.002 <0.001 0.256F <1 M,X,F 0.72 12.9 11.03 0.00 88.87
11/12/13 NM NM 12.81 0.00 87.09
06/23/15 NM NM 11.09 0.00 88.81
09/15/16 <0.002 <0.005 <0.005 <0.005 <0.005 <0.005 0.258 <1.0 0.35 16.4 11.90 0.00 88.00
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 0.126 <1.0 0.82 18.8 12.21 0.00 87.69
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 2.01 14.5 11.04 0.00 88.86
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0985 J <0.100 2.38 13.0 11.46 0.00 88.44
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.154 0.228 B NM NM 11.24 0.00 88.66
02/27/24 NM NM 10.03 0.00 89.87
06/14/24 NM NM 11.01 0.00 88.89
09/09/24 NM NM 11.54 0.00 88.36

MW-9 03/21/12 0.012 <0.001 <0.001 <0.003 0.016 Jhi <0.001 0.587 F <1 M,X,F 0.62 12.1 8.18 0.00 90.62
98.80 11/07/12 0.006 <0.005 <0.005 <0.015 0.016 <0.005 0.522 F <1 M,X,F 0.54 16.9 11.39 0.00 87.41
04/30/13 0.008 <0.005 0.005 <0.015 0.046 <0.005 0.770 F <1 M,X,F 0.66 12 10.20 0.00 88.60
11/12/13 NM NM 11.83 0.00 86.97
06/23/15 NM NM 10.50 0.00 88.30
09/15/16 0.011 <0.005 <0.005 <0.005 0.013 <0.005 0.854 1.0 0.41 16.9 11.26 0.00 87.57
10/31/17 0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.51 19.3 11.49 0.00 87.31
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.74 13.8 10.60 0.00 88.20
04/09/20 0.000171 J <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0942 J 0.187 2.46 11.6 10.84 0.00 87.96
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 <0.100 NM NM 10.62 0.00 88.18
02/27/24 NM NM 9.32 0.00 89.48
06/14/24 NM NM 10.49 0.00 88.31
09/09/24 NM NM 10.78 0.00 88.02

MW-10 03/21/12 0.028 <0.001 <0.001 <0.003 0.037 Jhi 0.028 0.483 F <1 M,X,F 0.76 13.9 8.70 0.00 90.86
99.56 11/07/12 0.066 <0.001 0.009 <0.003 0.020 0.043 0.652 F <1 M,X,F 0.71 17.1 12.01 0.00 87.55
04/30/13 0.009 <0.001 <0.001 <0.003 0.003 0.017 0.192 F <1 M,X,F 0.56 14.5 10.42 0.00 89.14
11/12/13 NM NM 12.32 0.00 87.24
06/23/15 NM NM 10.14 0.00 89.42
09/15/16 0.014 <0.005 <0.005 <0.005 0.006 0.014 <0.050 <1.0 0.42 20.6 11.23 0.00 88.33
10/31/17 0.109 <0.071 <0.071 <0.071 0.081 <0.029 <0.714 1.1 0.49 20.6 11.15 0.00 88.41
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Decommissioned. Replaced by MW-7R
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Page 4 of 5
SAMPLE ETHYL-NAPH-
LOCATION DATE BENZENE TOLUENE BENZENE XYLENES THALENE MTBE TPH-GRO TPH-DRO DO TEMP.DTW FP WTE
TOC (ft.)MM/DD/YY (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(Co )(feet)(feet)(feet)
Initial Screening Level 0.005 1.0 0.7 10 0.7 0.2 1.0 1.0
RBCA Tier 1 Screening 0.3 3.0 4.0 10 0.7 0.2 10 10
WEST VALLEY, UTAH
TABLE 1
GROUNDWATER ANALYTICAL and ELEVATION DATA
TESORO #46
3596 WEST 3100 SOUTH
MW-10 01/30/19 0.093 <0.012 <0.012 <0.012 0.059 0.009 0.408 1.2 0.26 17.1 10.10 0.00 89.46
Cont.04/09/20 0.0557 0.00121 0.000961J 0.00165J 0.0334 0.00854 0.891 0.883 0.74 15.4 10.11 0.00 89.45
06/09/21 0.0314 <0.00100 <0.00100 <0.00300 0.0362 0.00647 0.556 1.04 NM NM 9.85 0.00 89.71
02/27/24 NM NM 9.03 0.00 90.53
06/14/24 NM NM 9.92 0.00 89.64
09/09/24 NM NM 10.75 0.00 88.81
MW-11 04/30/13 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.005 F <1 M,X,F 1.06 12.9 9.73 0.00 89.52
99.25 11/12/13 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.05 F <1 M,X,F 1.01 20.2 10.80 0.00 88.45
06/23/15 NM NM 8.86 0.00 90.39
09/15/16 <0.002 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0 0.36 19.3 10.48 0.00 88.77
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 1.23 19.8 11.00 0.00 88.25
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 3.01 14.0 10.22 0.00 89.03
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 0.0331 J <0.100 2.25 11.3 10.93 0.00 88.32
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 <0.100 NM NM 10.09 0.00 89.16
02/27/24 NM NM 8.38 0.00 90.87
06/14/24 NM NM 9.21 0.00 90.04
09/09/24 NM NM 9.53 0.00 89.72
MW-12 04/30/13 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.005 F <1 M,X,F 0.96 10.3 10.17 0.00 88.58
98.75 11/12/13 <0.001 <0.001 <0.001 <0.003 <0.002 <0.001 <0.05 F <1 M,X,F 0.89 20.4 11.71 0.00 87.04
06/23/15 NM NM 9.60 0.00 89.15
09/15/16 <0.002 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0 0.88 19.0 8.64 0.00 90.11
10/31/17 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 0.93 19.3 11.34 0.00 87.41
01/30/19 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005 <0.125 <1.0 2.10 12.6 9.69 0.00 89.06
04/09/20 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 <0.100 1.99 10.9 10.49 0.00 88.26
06/09/21 <0.00100 <0.00100 <0.00100 <0.00300 <0.00500 <0.00100 <0.100 <0.300 NM NM 10.06 0.00 88.69
02/27/24 NM NM 5.29 0.00 93.46
06/14/24 NM NM 10.44 0.00 88.31
09/09/24 NM NM 10.15 0.00 88.60

MW-14*04/05/07 7.1 0.040 1.3 0.086 0.60 <0.005 3.3 15 NM NM 8.11 0.00 NC
03/19/09 4.800 0.039 J 0.380 0.0923 J 0.400 0.030 J 13.0 4.5 NM NM 8.80 0.00 NC
09/23/09 5.500 0.044 0.110 0.1025 0.680 0.026 14.0 3.8 NM NM 9.29 0.00 NC
03/22/10 0.85 14.3 9.29 0.00 NC
09/13/10 2.50 0.091 J 0.150 0.028 J 0.230 0.015 J 8.9 2.3 0.89 14.7 8.95 0.00 NC
03/02/11 2.86 <0.02 0.203 <0.06 0.319 Jlo 0.038 5.36 F 2.5 F 0.74 13.4 8.06 0.00 NC
11/28/11 5.08 0.215 0.240 0.337 0.531 <0.05UJ 10.2 F 2.5 F 0.66 18.8 8.42 0.00 NC
03/21/12 4.44 0.026 0.106 0.046 0.602 0.013 10.9 F 2.3 M,X,F 0.72 14.2 8.47 0.00 NC
11/07/12 2.33 0.025 0.040 <0.06 0.272 <0.02 7.05 F <1 M,X,F 0.68 17.2 11.89 0.00 NC
04/30/13 1.09 0.006 0.011 0.017 0.117 0.024 3.54 F <1 M,X,F 0.64 14.9 10.53 0.00 NC
11/12/13 1.18 <0.01 0.023 <0.03 0.129 0.014 2.91 F 2.7 M,X,F 0.53 20.4 12.19 0.00 NC
06/23/15 0.049 <0.005 <0.005 <0.005 <0.005 <0.005 <0.24 <1.0 2.02 19.7 10.84 0.00 NC
09/15/16 0.270 <0.005 <0.005 <0.005 <0.005 <0.005 <0.050 <1.0 0.41 20.6 11.38 0.00 NC
10/31/17 0.274 <0.050 <0.050 <0.050 0.060 0.023 <0.500 <1.0 0.60 19.9 11.02 0.00 NC
01/30/19 0.230 <0.012 <0.012 0.014 0.022 0.011 0.624 <1.0 0.78 17.3 10.63 0.00 NC
04/09/20 0.251 0.00497 0.00266 0.0153 0.0327 0.0142 2.760 1.370 1.59 15.2 10.97 0.00 NC
06/09/21 0.258 0.00594 0.00260 0.0152 0.0476 0.0114 2.86 2.11 NM NM 10.72 0.00 NC
02/27/24 0.691 0.012 0.012 0.029 0.238 <0.005 1.84 1.9 NM NM 9.49 0.00 NC
06/14/24 0.669 0.0113 0.00948 0.0283 0.196 0.00635 4.360 2.710 NM NM 10.42 0.00 NC
09/09/24 0.635 0.0139 J 0.00716 J 0.0252 J 0.198 0.00710 J 3.830 2.960 NM NM 10.89 0.00 NC
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Page 5 of 5
SAMPLE ETHYL-NAPH-
LOCATION DATE BENZENE TOLUENE BENZENE XYLENES THALENE MTBE TPH-GRO TPH-DRO DO TEMP.DTW FP WTE
TOC (ft.)MM/DD/YY (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(Co )(feet)(feet)(feet)
Initial Screening Level 0.005 1.0 0.7 10 0.7 0.2 1.0 1.0
RBCA Tier 1 Screening 0.3 3.0 4.0 10 0.7 0.2 10 10
WEST VALLEY, UTAH
TABLE 1
GROUNDWATER ANALYTICAL and ELEVATION DATA
TESORO #46
3596 WEST 3100 SOUTH
Notes:
mg/L = MILLIGRAMS PER LITER, WHICH APPROXIMATES PARTS PER MILLION
TOC = SURVEYED ELEVATION TOP-OF-CASING FP = FREE PRODUCT DO = DISSOLVED OXYGEN
RBCA = RISK BASED CORRECTIVE ACTION NC = NOT CALCULATED M = MICRO-EXTRACTION USED FOR TPH DRO
F = NO DUAL COLUMN CONFIRMATION TEMP = TEMPERATURE X = HEXANE USED FOR EXTRACTIONS
DTW = DEPTH TO GROUNDWATER NM = NOT MEASURED
Jlo = ESTIMATED VALUE. RESULTS MAY BE BIASED LOW. SPIKE OR SURROGATE RECOVERY ABOVE QC LIMITS
Jcal = ESTIMATED VALUE. RESULT OUTSIDE LINEAR CALIBRATION RANGE OF INSTRUMENT.
Jhi = ESTIMATED VALUE. RESULTS MAY BE BIASED HIGH. SPIKE OR SURROGATE RECOVERY BELOW QC LIMITS
UJ = ANALYTE NOT DETECTED. SPIKE OR SURROGATE RECOVERY BELOW LIMITS
WTE = WATER TABLE ELEVATION, CORRECTED FOR FREE PRODUCT IF PRESENT, USING A SPECIFIC GRAVITY OF 0.75
" < " = NOT DETECTED AT THE INDICATED LABORATORY REPORTING LIMIT
BOLDED VALUES INDICATE AN EXCEEDENCE OF THE TIER 1 SCREENING LEVEL
* = MONITORING WELL ASSOCIATED WITH RELEASE FFB, LOCATED SOUTH OF THE TESORO PROPERTY
J = THE IDENTIFICAATION OF THE ANALYTE IS ACCEPTABLE; THE REPORTED VALUE IS AN ESTIMATEJ-LOW= ESTIMATED LOW DUE TO LOW RECOVERY OF LCS OR CCV
B = THE SAME ANALYTE IS FOUND IN THE ASSOCIATED BLANK
QM-4X = THE SPIKE RECOVERY WAS OUTSIDE ACCEPTANCE LIMITS FOR THE MS AND/OR MSD DUE TO ANALYTE CONCENTRATION AT 4 TIMES OR GREATER
THE SPIKE CONCENTRATION. THE QC BATCH WAS ACCEPTED BASED ON LCS AND/OR LCSD RECOVERIES WITHIN THE ACCEPTANCE LIMITS.

APPENDIX A

LABORATORY REPORTS

ANALYTICAL REPORT
September 17, 2024
One Atlas
Sample Delivery Group:L1775790
Samples Received:09/10/2024
Project Number:
Description:Tesoro #46
Report To:Jim Coletta
1775 South 4130 West, Ste A
Salt Lake City, UT 84104
Entire Report Reviewed By:
September 17, 2024
[Preliminary Report]
Daphne Richards
Project Manager
Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be
reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace
Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and
ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided,
and as the samples are received.
Pace Analytical National
12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 mydata.pacelabs.com
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
One Atlas L1775790 09/17/24 15:37 1 of 16
September 17, 2024
Daphne Richards
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
One Atlas L1775790 09/17/24 16:27 1 of 16
TABLE OF CONTENTS
Cp: Cover Page 1
Tc: Table of Contents 2
Ss: Sample Summary 3
Cn: Case Narrative 4
Sr: Sample Results 5
MW-2R L1775790-01 5
MW-7R L1775790-02 6
MW-14 L1775790-03 7
TRIP BLANK L1775790-04 8
Qc: Quality Control Summary 9
Volatile Organic Compounds (GC) by Method 8015D/GRO 9
Volatile Organic Compounds (GC/MS) by Method 8260B 10
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 13
Gl: Glossary of Terms 14
Al: Accreditations & Locations 15
Sc: Sample Chain of Custody 16
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
One Atlas L1775790 09/17/24 15:37 2 of 16
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
One Atlas L1775790 09/17/24 16:27 2 of 16
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-2R L1775790-01 GW Olaf Questereit 09/09/24 13:15 09/10/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC) by Method 8015D/GRO WG2361640 1 09/13/24 01:06 09/13/24 01:06 JHH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B WG2361748 1 09/14/24 19:48 09/14/24 19:48 DWR Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2362238 1 09/15/24 16:53 09/16/24 20:22 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-7R L1775790-02 GW Olaf Questereit 09/09/24 13:00 09/10/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC) by Method 8015D/GRO WG2361640 1 09/13/24 01:27 09/13/24 01:27 JHH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B WG2361748 1 09/14/24 20:09 09/14/24 20:09 DWR Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B WG2363529 5 09/16/24 22:14 09/16/24 22:14 DYW Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2362238 1 09/15/24 16:53 09/16/24 20:43 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-14 L1775790-03 GW Olaf Questereit 09/09/24 12:45 09/10/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC) by Method 8015D/GRO WG2361640 1 09/13/24 01:48 09/13/24 01:48 JHH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 8260B WG2361748 20 09/14/24 21:12 09/14/24 21:12 DWR Mt. Juliet, TN
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 WG2362238 1 09/15/24 16:53 09/16/24 21:03 DMG Mt. Juliet, TN
Collected by Collected date/time Received date/time
TRIP BLANK L1775790-04 GW Olaf Questereit 09/09/24 00:00 09/10/24 08:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 8260B WG2362464 1 09/14/24 07:16 09/14/24 07:16 JCP Mt. Juliet, TN
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
One Atlas L1775790 09/17/24 16:27 3 of 16
CASE NARRATIVE
All sample aliquots were received at the correct temperature, in the proper containers, with the
appropriate preservatives, and within method specified holding times, unless qualified or notated within
the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples
have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control
are within established criteria except where addressed in this case narrative, a non-conformance form
or properly qualified within the sample results. By my digital signature below, I affirm to the best of my
knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the
quality of the data have been identified by the laboratory, and no information or data have been
knowingly withheld that would affect the quality of the data.
[Preliminary Report]
Daphne Richards
Project Manager
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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Daphne Richards
Project Manager
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SAMPLE RESULTS - 01
L1775790
MW-2R
Collected date/time: 09/09/24 13:15
Volatile Organic Compounds (GC) by Method 8015D/GRO
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) Low Fraction 1740 31.4 100 1 09/13/2024 01:06 WG2361640
(S)
a,a,a-Trifluorotoluene(FID)92.4 78.0-120 09/13/2024 01:06 WG2361640
Volatile Organic Compounds (GC/MS) by Method 8260B
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 164 0.0941 1.00 1 09/14/2024 19:48 WG2361748
Toluene 1.35 0.278 1.00 1 09/14/2024 19:48 WG2361748
Ethylbenzene 7.85 0.137 1.00 1 09/14/2024 19:48 WG2361748
Total Xylenes 3.88 0.174 3.00 1 09/14/2024 19:48 WG2361748
Methyl tert-butyl ether 0.592 J 0.101 1.00 1 09/14/2024 19:48 WG2361748
Naphthalene 2.26 J 1.00 5.00 1 09/14/2024 19:48 WG2361748
(S) Toluene-d8 102 80.0-120 09/14/2024 19:48 WG2361748
(S) 4-Bromofluorobenzene 96.9 77.0-126 09/14/2024 19:48 WG2361748
(S) 1,2-Dichloroethane-d4 107 70.0-130 09/14/2024 19:48 WG2361748
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) High Fraction 284 B 24.7 100 1 09/16/2024 20:22 WG2362238
(S) o-Terphenyl 74.7 52.0-156 09/16/2024 20:22 WG2362238
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 02
L1775790
MW-7R
Collected date/time: 09/09/24 13:00
Volatile Organic Compounds (GC) by Method 8015D/GRO
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) Low Fraction 3500 31.4 100 1 09/13/2024 01:27 WG2361640
(S)
a,a,a-Trifluorotoluene(FID)120 78.0-120 09/13/2024 01:27 WG2361640
Volatile Organic Compounds (GC/MS) by Method 8260B
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 369 0.471 5.00 5 09/16/2024 22:14 WG2363529
Toluene 6.15 0.278 1.00 1 09/14/2024 20:09 WG2361748
Ethylbenzene 16.3 0.137 1.00 1 09/14/2024 20:09 WG2361748
Total Xylenes 7.79 0.174 3.00 1 09/14/2024 20:09 WG2361748
Methyl tert-butyl ether 1.85 0.101 1.00 1 09/14/2024 20:09 WG2361748
Naphthalene 5.42 1.00 5.00 1 09/14/2024 20:09 WG2361748
(S) Toluene-d8 97.2 80.0-120 09/14/2024 20:09 WG2361748
(S) Toluene-d8 107 80.0-120 09/16/2024 22:14 WG2363529
(S) 4-Bromofluorobenzene 95.9 77.0-126 09/14/2024 20:09 WG2361748
(S) 4-Bromofluorobenzene 107 77.0-126 09/16/2024 22:14 WG2363529
(S) 1,2-Dichloroethane-d4 107 70.0-130 09/14/2024 20:09 WG2361748
(S) 1,2-Dichloroethane-d4 109 70.0-130 09/16/2024 22:14 WG2363529
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) High Fraction 1330 24.7 100 1 09/16/2024 20:43 WG2362238
(S) o-Terphenyl 74.7 52.0-156 09/16/2024 20:43 WG2362238
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 03
L1775790
MW-14
Collected date/time: 09/09/24 12:45
Volatile Organic Compounds (GC) by Method 8015D/GRO
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) Low Fraction 3830 31.4 100 1 09/13/2024 01:48 WG2361640
(S)
a,a,a-Trifluorotoluene(FID)99.5 78.0-120 09/13/2024 01:48 WG2361640
Volatile Organic Compounds (GC/MS) by Method 8260B
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 635 1.88 20.0 20 09/14/2024 21:12 WG2361748
Toluene 13.9 J 5.56 20.0 20 09/14/2024 21:12 WG2361748
Ethylbenzene 7.16 J 2.74 20.0 20 09/14/2024 21:12 WG2361748
Total Xylenes 25.2 J 3.48 60.0 20 09/14/2024 21:12 WG2361748
Methyl tert-butyl ether 7.10 J 2.02 20.0 20 09/14/2024 21:12 WG2361748
Naphthalene 198 20.0 100 20 09/14/2024 21:12 WG2361748
(S) Toluene-d8 107 80.0-120 09/14/2024 21:12 WG2361748
(S) 4-Bromofluorobenzene 100 77.0-126 09/14/2024 21:12 WG2361748
(S) 1,2-Dichloroethane-d4 102 70.0-130 09/14/2024 21:12 WG2361748
Semi-Volatile Organic Compounds (GC) by Method 3511/8015
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
TPH (GC/FID) High Fraction 2960 24.7 100 1 09/16/2024 21:03 WG2362238
(S) o-Terphenyl 92.1 52.0-156 09/16/2024 21:03 WG2362238
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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SAMPLE RESULTS - 04
L1775790
TRIP BLANK
Collected date/time: 09/09/24 00:00
Volatile Organic Compounds (GC/MS) by Method 8260B
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene U 0.0941 1.00 1 09/14/2024 07:16 WG2362464
Toluene U 0.278 1.00 1 09/14/2024 07:16 WG2362464
Ethylbenzene U 0.137 1.00 1 09/14/2024 07:16 WG2362464
Total Xylenes U 0.174 3.00 1 09/14/2024 07:16 WG2362464
Methyl tert-butyl ether U 0.101 1.00 1 09/14/2024 07:16 WG2362464
Naphthalene U 1.00 5.00 1 09/14/2024 07:16 WG2362464
(S) Toluene-d8 105 80.0-120 09/14/2024 07:16 WG2362464
(S) 4-Bromofluorobenzene 102 77.0-126 09/14/2024 07:16 WG2362464
(S) 1,2-Dichloroethane-d4 94.6 70.0-130 09/14/2024 07:16 WG2362464
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2361640
Volatile Organic Compounds (GC) by Method 8015D/GRO L1775790-01,02,03
Method Blank (MB)
(MB) R4119420-3 09/12/24 16:35
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
TPH (GC/FID) Low Fraction U 31.4 100
(S)
a,a,a-Trifluorotoluene(FID)93.0 78.0-120
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4119420-1 09/12/24 15:32 • (LCSD) R4119420-2 09/12/24 15:53
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
TPH (GC/FID) Low Fraction 5000 4250 4470 85.0 89.4 72.0-127 5.05 20
(S)
a,a,a-Trifluorotoluene(FID) 102 99.6 78.0-120
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2361748
Volatile Organic Compounds (GC/MS) by Method 8260B L1775790-01,02,03
Method Blank (MB)
(MB) R4120320-2 09/14/24 12:09
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
Toluene U 0.278 1.00
Ethylbenzene U 0.137 1.00
Total Xylenes U 0.174 3.00
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
(S) Toluene-d8 106 80.0-120
(S) 4-Bromofluorobenzene 99.3 77.0-126
(S) 1,2-Dichloroethane-d4 98.6 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4120320-1 09/14/24 11:26 • (LCSD) R4120320-3 09/14/24 12:50
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 4.85 5.03 97.0 101 70.0-123 3.64 20
Toluene 5.00 4.96 4.95 99.2 99.0 79.0-120 0.202 20
Ethylbenzene 5.00 4.98 4.92 99.6 98.4 79.0-123 1.21 20
Total Xylenes 15.0 14.8 14.7 98.7 98.0 79.0-123 0.678 20
Methyl tert-butyl ether 5.00 4.96 5.30 99.2 106 68.0-125 6.63 20
Naphthalene 5.00 4.68 4.44 93.6 88.8 54.0-135 J J 5.26 20
(S) Toluene-d8 104 104 80.0-120
(S) 4-Bromofluorobenzene 98.1 99.5 77.0-126
(S) 1,2-Dichloroethane-d4 98.0 98.4 70.0-130
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2362464
Volatile Organic Compounds (GC/MS) by Method 8260B L1775790-04
Method Blank (MB)
(MB) R4120337-3 09/14/24 05:48
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
Toluene U 0.278 1.00
Ethylbenzene U 0.137 1.00
Total Xylenes U 0.174 3.00
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
(S) Toluene-d8 104 80.0-120
(S) 4-Bromofluorobenzene 101 77.0-126
(S) 1,2-Dichloroethane-d4 90.9 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4120337-1 09/14/24 04:42 • (LCSD) R4120337-2 09/14/24 05:04
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 5.53 5.11 111 102 70.0-123 7.89 20
Toluene 5.00 5.73 5.20 115 104 79.0-120 9.70 20
Ethylbenzene 5.00 5.60 5.32 112 106 79.0-123 5.13 20
Total Xylenes 15.0 16.8 15.8 112 105 79.0-123 6.13 20
Methyl tert-butyl ether 5.00 5.92 5.68 118 114 68.0-125 4.14 20
Naphthalene 5.00 5.02 5.60 100 112 54.0-135 10.9 20
(S) Toluene-d8 104 103 80.0-120
(S) 4-Bromofluorobenzene 101 101 77.0-126
(S) 1,2-Dichloroethane-d4 96.7 96.1 70.0-130
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2363529
Volatile Organic Compounds (GC/MS) by Method 8260B L1775790-02
Method Blank (MB)
(MB) R4120748-3 09/16/24 18:23
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
(S) Toluene-d8 107 80.0-120
(S) 4-Bromofluorobenzene 101 77.0-126
(S) 1,2-Dichloroethane-d4 112 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4120748-1 09/16/24 16:43 • (LCSD) R4120748-2 09/16/24 17:06
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 5.61 5.20 112 104 70.0-123 7.59 20
(S) Toluene-d8 103 104 80.0-120
(S) 4-Bromofluorobenzene 103 107 77.0-126
(S) 1,2-Dichloroethane-d4 108 104 70.0-130
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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QUALITY CONTROL SUMMARYWG2362238
Semi-Volatile Organic Compounds (GC) by Method 3511/8015 L1775790-01,02,03
Method Blank (MB)
(MB) R4120461-3 09/16/24 16:41
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
TPH (GC/FID) High Fraction 62.9 J 24.7 100
(S) o-Terphenyl 76.0 52.0-156
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R4120461-1 09/16/24 10:37 • (LCSD) R4120461-2 09/16/24 10:57
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
TPH (GC/FID) High Fraction 1500 1500 1510 100 101 50.0-150 0.664 20
(S) o-Terphenyl 90.0 92.5 52.0-156
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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GLOSSARY OF TERMS
Guide to Reading and Understanding Your Laboratory Report
The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not
intended as a comprehensive explanation, and if you have additional questions please contact your project representative.
Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name,
Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and
Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received.
Abbreviations and Definitions
MDL Method Detection Limit.
RDL Reported Detection Limit.
Rec.Recovery.
RPD Relative Percent Difference.
SDG Sample Delivery Group.
(S)
Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and
Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be
detected in all environmental media.
U Not detected at the Reporting Limit (or MDL where applicable).
Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes
reported.
Dilution
If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the
standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the
laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the
result reported has already been corrected for this factor.
Limits
These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal
for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or
duplicated within these ranges.
Qualifier
This column provides a letter and/or number designation that corresponds to additional information concerning the result
reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and
potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable.
Result
The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was
no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL”
(Below Detectable Levels). The information in the results column should always be accompanied by either an MDL
(Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect
or report for this analyte.
Uncertainty
(Radiochemistry)Confidence level of 2 sigma.
Case Narrative (Cn)
A brief discussion about the included sample results, including a discussion of any non-conformances to protocol
observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will
be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report.
Quality Control
Summary (Qc)
This section of the report includes the results of the laboratory quality control analyses required by procedure or
analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not
being performed on your samples typically, but on laboratory generated material.
Sample Chain of
Custody (Sc)
This is the document created in the field when your samples were initially collected. This is used to verify the time and
date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This
chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the
samples from the time of collection until delivery to the laboratory for analysis.
Sample Results (Sr)
This section of your report will provide the results of all testing performed on your samples. These results are provided
by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for
each sample will provide the name and method number for the analysis reported.
Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and
times of preparation and/or analysis.
Qualifier Description
B The same analyte is found in the associated blank.
J The identification of the analyte is acceptable; the reported value is an estimate.
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122
Alabama 40660 Nebraska NE-OS-15-05
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California 2932 New Mexico ¹TN00003
Colorado TN00003 New York 11742
Connecticut PH-0197 North Carolina Env375
Florida E87487 North Carolina ¹DW21704
Georgia NELAP North Carolina ³41
Georgia ¹923 North Dakota R-140
Idaho TN00003 Ohio–VAP CL0069
Illinois 200008 Oklahoma 9915
Indiana C-TN-01 Oregon TN200002
Iowa 364 Pennsylvania 68-02979
Kansas E-10277 Rhode Island LAO00356
Kentucky ¹ ⁶KY90010 South Carolina 84004002
Kentucky ²16 South Dakota n/a
Louisiana AI30792 Tennessee ¹ ⁴2006
Louisiana LA018 Texas T104704245-20-18
Maine TN00003 Texas ⁵LAB0152
Maryland 324 Utah TN000032021-11
Massachusetts M-TN003 Vermont VT2006
Michigan 9958 Virginia 110033
Minnesota 047-999-395 Washington C847
Mississippi TN00003 West Virginia 233
Missouri 340 Wisconsin 998093910
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A2LA – ISO 17025 ⁵1461.02 DOD 1461.01
Canada 1461.01 USDA P330-15-00234
EPA–Crypto TN00003
ACCREDITATIONS & LOCATIONS

¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable
* Not all certifications held by the laboratory are applicable to the results reported in the attached report.
* Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical.
1 Cp
2 Tc
3 Ss
4 Cn
5 Sr
6 Qc
7 Gl
8 Al
9 Sc
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