DERR-2024-010764

Table 1
Historical Soil Analytical Results
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
(feet bgs)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)
0.20 9 5 142 150
0.90 25 23 142 1500
SW Tank Basin 1991 12 1.37 210 60.5 364 4,630
NE Tank Basin 1991 12 <0.2 <0.2 <0.2 0.607 1.63
SW Pre-mix Tank 1991 12 <0.2 <0.2 <0.2 <0.2 <1.0
NE Pre-mix Tank 1991 12 20.9 8.93 80.4 697 10,200
SE Tank Basin 1991 12 4.93 2.09 <0.2 63.3 911
NW Tank Basin 1991 12 22.5 197 48.5 467 6,750
50' From Tank 1991 2 <0.2 <0.2 <0.2 <0.2 4.15
700' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 5,680
650' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 217
600' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
550' From Bottom 1991 1 <0.2 0.49 0.71 10.4 15,800
500' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
450' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 3,040
400' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
350' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 791
300' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
250' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
200' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
150' From Bottom 1991 1 <0.2 <0.2 0.2 2.06 221
100' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
50' From Bottom 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
End of Pipe 1991 1 <0.2 <0.2 <0.2 <0.2 <1.0
Area #1 (tank basin)6/7/1991 2 12.2 325 111 756 8,000
Area #1 (outside tank basin)6/7/1991 2 <0.2 <0.2 <0.2 <0.2 <1.0
Area #2 6/7/1991 2 <0.2 15.8 14.5 174 2,570
Area #3 6/7/1991 2 <0.2 <0.2 <0.2 <0.2 <1.0
Area #4 6/7/1991 2 60.2 906 286 1.69 15,300
Area #5 6/7/1991 2 <0.2 <0.2 <0.2 <0.2 10.7
Area #6 6/7/1991 2 <0.2 <0.2 <0.2 <0.2 <1.0
See Notes on Page 2.
Tier 1 SLs:
DateSample Location
Total Xylenes TPH-GRODepth
DERR ISLs:
Benzene EthylbenzeneToluene
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Table 1
Historical Soil Analytical Results
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Notes:
Concentrations are reported in mg/kg and approximate parts per million.
Samples were analyzed by United States Environmental Protection Agency Methods 8020 and 8015 modified.
<0.2 = Not detected at or above the method detection limit of 0.2 mg/kg.
Analytical reports included in Site Abatement and Initial Site Characterization Reports.
Samples analyzed by ChemTech Analytical Laboratory.
Bold data exceed ISLs.
Bold and shaded data exceed Tier 1 SLs.
Hatched data indicate the area was excavated during tank removal.
Acronyms and Abbreviations:
' = foot or feet
DERR = Utah Department of Environmental Quality, Division of Environmental Response and Remediation
ISL = Initial Screening Level
mg/kg = milligrams per kilogram
NE = northeast
SW = southwest
TPH-GRO = total petroleum hydrocarbons - gasoline range organics
SL = Screening Level
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
MRB-4 7/1/1993 ND ND ND ND NA NA ND NA NA 61.98 0.00 3,637.97
TOC:10/20/1993 ND ND ND ND NA NA ND NA NA 64.66 0.00 3,635.29
3,699.95 3/17/1994 ND ND ND ND NA NA ND NA NA 52.4 0.00 3,647.55
6/9/1994 ND ND ND ND NA NA ND NA NA 52.25 0.00 3,647.70
12/15/1994 ND ND ND ND NA NA ND NA NA 51.89 0.00 3,648.06
3/8/1995 ND ND ND ND NA NA ND NA NA 53.68 0.00 3,646.27
6/7/1995 ND ND ND ND NA NA ND NA NA 54.03 0.00 3,645.92
12/6/1995 ND ND ND ND NA NA ND NA NA 28.38 0.00 3,671.57
5/30/1996 ND ND ND ND NA NA ND NA NA 32.44 0.00 3,667.51
12/18/1996 ND ND ND ND NA NA ND NA NA 30.83 0.00 3,669.12
6/18/1997 ND ND ND ND ND ND ND NA NA 29.66 0.00 3,670.29
12/18/1997 ND ND ND ND ND ND ND NA NA 22.00 0.00 3,677.95
6/17/1998 ND ND ND ND ND ND ND NA NA 19.34 0.00 3,680.61
12/22/1998 ND ND ND ND ND ND ND NA NA 21.72 0.00 3,678.23
6/21/1999 ND ND ND ND ND ND ND NA NA 21.48 0.00 3,678.47
11/12/1999 <0.0005 <0.0005 <0.0005 <0.0005 NS <0.002 <0.05 NA NA 17.81 0.00 3,682.14
5/19/2000 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <0.5 NA NA 28.09 0.00 3,671.86
11/9/2000 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <0.5 NA NA 27.15 0.00 3,672.80
5/3/2001 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <0.5 NA NA 38.8 0.00 3,661.15
9/18/2002 <0.0005 <0.0005 <0.0005 <0.0015 NA <0.0025 <0.05 NA NA 51.85 0.00 3,648.10
9/17/2003 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 0.0005 <0.05 NA NA 62.25 0.00 3,637.70
9/22/2004 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 0.0005 <0.05 0.45 NA 70.74 0.00 3,629.21
10/6/2005 <0.0005 0.0009 <0.0005 0.003 <0.001 <0.0005 <0.05 0.63 NA 74.05 0.00 3,625.90
10/5/2006 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.5')0.00 NC
10/18/2007 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.0')0.00 NC
9/16/2008 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.0')0.00 NC
9/28/2009 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.12')0.00 NC
9/26/2010 DRY DRY DRY DRY DRY DRY DRY DRY NA 74.2 0.00 3,625.75
12/10/2011 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.022 <0.50 NA 63.45 0.00 3,636.50
12/10/2012 DRY DRY DRY DRY DRY DRY DRY DRY NA 74.92 0.00 3,625.03
6/23/2014 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.022 NA NA 74.81 0.00 3,625.14
9/28/2015 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.3')0.00 NC
5/16/2019 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.2')0.00 NC
12/10/2019 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (76.1')0.00 NC
5/5/2020 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY(75.2)0.00 NC
10/6/2020 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY(75.2)0.00 NC
3/23/2021 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.4)0.00 NC
5/25/2021 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.4)0.00 NC
8/3/2021 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.38)0.00 NC
11/4/2021 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.38)0.00 NC
MRB-4 11/8/2023 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (75.26)0.00 NC
See Notes on Page 8.
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
MRB-5 7/1/1993 ND ND ND ND NA NA ND NA NA 123.86 0.00 3,617.93
TOC:10/20/1993 ND ND ND ND NA NA ND NA NA 128.81 0.00 3,612.98
3,741.79 3/17/1994 ND ND ND ND NA NA ND NA NA NM NM NM
6/9/1994 ND ND ND ND NA NA ND NA NA 108.51 0.00 3,633.28
12/15/1994 ND ND ND ND NA NA ND NA NA 106.97 0.00 3,634.82
3/8/1995 ND ND ND ND NA NA ND NA NA 108.45 0.00 3,633.34
6/7/1995 ND ND ND ND NA NA ND NA NA 108.12 0.00 3,633.67
12/6/1995 ND ND ND ND NA NA ND NA NA 92.42 0.00 3,649.37
5/30/1996 ND ND ND ND NA NA ND NA NA 91.97 0.00 3,649.82
12/18/1996 ND ND ND ND NA NA ND NA NA 88.38 0.00 3,653.41
6/18/1997 ND ND ND ND ND ND ND NA NA 90.43 0.00 3,651.36
12/18/1997 ND ND 0.0022 0.0014 ND ND ND NA NA 81.48 0.00 3,660.31
6/17/1998 ND ND ND ND ND ND ND NA NA 81.97 0.00 3,659.82
12/22/1998 ND ND ND ND ND ND ND NA NA 78.98 0.00 3,662.81
6/21/1999 0.0021 ND ND ND ND ND ND NA NA 80.37 0.00 3,661.42
11/12/1999 <0.0005 <0.0005 <0.0005 <0.0005 NS <0.002 <0.050 NA NA 75.49 0.00 3,666.30
5/19/2000 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <5.0 NA NA 80.93 0.00 3,660.86
11/9/2000 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <5.0 NA NA 79.86 0.00 3,661.93
5/3/2001 <0.002 <0.002 <0.002 <0.006 <0.002 <0.002 <5.0 NA NA 86.81 0.00 3,654.98
9/18/2002 <0.0005 <0.0005 <0.0005 <0.0015 NA <0.0025 <0.050 NA NA 101.14 0.00 3,640.65
9/17/2003 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.050 NA NA 115.36 0.00 3,626.43
9/22/2004 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.050 0.33 NA 128.08 0.00 3,613.71
10/6/2005 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY 0.00 3,741.79
10/5/2006 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (133.8')0.00 NC
10/18/2007 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131')0.00 NC
9/16/2008 DRY DRY DRY DRY DRY DRY DRY DRY NA DRY (131')0.00 NC
9/28/2009 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.050 0.0037 NA 125.65 0.00 3,616.14
9/26/2010 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.022 <0.050 NA 121.64 0.00 3,620.15
12/10/2011 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.022 <0.050 NA 113.56 0.00 3,628.23
12/10/2012 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.022 <0.050 NA 118.55 0.00 3,623.24
6/23/2014 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (130')0.00 NC
9/28/2015 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (132')0.00 NC
5/16/2019 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (132.2')0.00 NC
12/10/2019 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.2')0.00 NC
5/5/2020 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (NA)0.00 NC
10/6/2020 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.2)0.00 NC
3/23/2021 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.2)0.00 NC
5/25/2021 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.25)0.00 NC
8/3/2021 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.25)0.00 NC
11/4/2021 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.25)0.00 NC
MRB-5 11/8/2023 DRY DRY DRY DRY DRY DRY DRY DRY DRY DRY (131.00)0.00 NC
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
VRB-2 11/8/2023 NS NS NS NS NS NS NS NS NS 53.01 0.00
TOC:
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
VRB-8 5/9/2006 8.6 20 1.3 12 0.5 <0.010 110 160 NS 38.11 0.00 3,687.24
TOC:10/18/2007 9.5 31 2.8 24 0.78 <0.025 220 310 NS 25.02 0.20 3,700.48
3,725.35 9/16/2008 3.0 12 1.4 19 1.7 0.011 110 390 NS 27.60 0.00 3,697.75
9/28/2009 0.53 3.0 0.48 9.5 0.51 <0.010 110 790 NS 27.42 0.00 3,697.93
9/26/2010 6.6 9.1 0.7 15 0.6 0.036 130 270 NS 28.14 0.00 3,697.21
12/10/2011 16 19 0.74 16 0.59 0.078 180 17 NS 27.71 0.00 3,697.64
12/10/2012 9.8 12 1.2 20 0.94 0.061 230 56 NS 28.02 0.00 3,697.33
6/23/2014 5.3 13 1.7 24 0.85 0.045 200 40 NS 32.98 0.00 3,692.37
9/28/2015 4.6 5.6 0.25 7.4 0.32 <0.025 88 19 NS 26.26 0.00 3,699.09
3/19/2019 20 24 1.4 17 0.53 0.055 170 160 NS 27.73 0.00 3,697.62
5/16/2019 14 16 1.3 12 0.55 0.056 160 51 NS 27.81 0.00 3,697.54
12/10/2019 16 17 1.1 11 0.40 J 0.055 J 170 3.3 NS 27.31 0.00 3,698.04
5/5/2020 NS NS NS NS NS NS NS NS NS 27.55 0.00 3,697.80
10/6/2020 DRY DRY DRY DRY DRY DRY DRY DRY NS 25.93 0.00 3,699.42
3/23/2021 9.84 1.17 1.57 13.6 0.361 0.0392 J 113 377 NS 25.81 0.00 3,699.54
5/26/2021 10 15 2.23 18 0.521 0.045 J 146 446 NS 46.31 0.00 3,679.04
8/3/2021 NS NS NS NS NS NS NS NS NS 27.72 0.00 3,697.63
11/4/2021 NS NS NS NS NS NS NS NS NS 27.16 0.00 3,698.19
11/9/2023 16.4 18.1 1.36 12.3 0.545 J 0.0546 J 158 262 132 25.98 0.00 3699.37
VRB-8 11/9/2023 (DUP)16.4 16.9 1.27 11.1 0.589 0.0542 159 286 140 25.98 0.00 3699.37
VRB-8A 6/23/2014 1.5 2.6 0.089 15 0.35 0.005 71 12 NS 28.11 0.00 3,697.84
TOC:9/28/2015 4.2 3.6 0.099 7.9 0.16 <0.025 65 8.2 NS 27.79 0.00 3,698.16
3,725.95 3/19/2019 6.2 13 1.1 15 0.42 0.023 170 140 NS 25.84 0.00 3,700.11
5/16/2019 4.7 8.7 0.81 11 0.44 0.018 130 39 NS 26.02 0.00 3,699.93
12/10/2019 6.4 10 0.77 12 0.370 J <0.020 140 4 NS 24.85 0.00 3,701.10
5/5/2020 NS NS NS NS NS NS NS NS NS 25.90 0.00 3,700.05
10/6/2020 NS NS NS NS NS NS NS NS NS 27.90 0.00 3,698.05
3/23/2021 NS NS NS NS NS NS NS NS NS 28.00 0.00 3,697.95
8/3/2021 NS NS NS NS NS NS NS NS NS 25.47 0.00 3,700.48
11/4/2021 NS NS NS NS NS NS NS NS NS 27.42 0.00 3,698.53
VRB-8A 11/8/2023 NS NS NS NS NS NS NS NS NS 26.72 0.00 3,699.23
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
VRB-9 5/9/2006 13 27 2.1 15 0.41 <0.025 130 36 NS 28.33 0.00 3,698.52
TOC:10/18/2007 7.6 24 2.0 17 0.48 <0.013 120 54 NS 29.35 0.00 3,697.50
3,726.85 9/16/2008 5.7 16 1.3 17 0.41 <0.010 91 29 NS 29.89 0.00 3,696.96
9/28/2009 6.6 20 1.6 19 0.53 <0.010 120 31 NS 29.71 0.00 3,697.14
9/26/2010 4.9 16 1.4 19 0.49 <0.0005 120 28 NS 28.50 0.00 3,698.35
12/10/2011 3.7 15 1.3 18 0.55 <0.010 88 4.5 NS 29.57 0.00 3,697.28
12/10/2012 3.0 9.3 0.89 14 0.46 <0.010 83 13 NS 30.06 0.00 3,696.79
6/23/2014 4.1 13 1.6 17 0.53 <0.010 97 31 NS 30.08 0.00 3,696.77
9/28/2015 4.00 8.7 0.85 11 0.23 <0.050 72 2.4 NS 29.21 0.00 3,697.64
3/19/2019 2.50 8.5 0.78 13 0.34 <0.004 55 18 NS 31.08 0.00 3,695.77
5/16/2019 NS NS NS NS NS NS NS NS NS NM NM NM
12/10/2019 NS NS NS NS NS NS NS NS NS NM NM NM
5/5/2020 NS NS NS NS NS NS NS NS NS 37.35 0.00 3,689.50
10/6/2020 NS NS NS NS NS NS NS NS NS 49.95 0.00 3,676.90
3/23/2021 NS NS NS NS NS NS NS NS NS 52.26 0.00 3,674.59
8/3/2021 NS NS NS NS NS NS NS NS NS 55.03 0.00 3,671.82
11/4/2021 NS NS NS NS NS NS NS NS NS 54.12 0.00 3,672.73
VRB-9 11/9/2023 2.06 2.84 0.312 10.4 0.317 0.00243 J 64.3 99.6 66.1 50.34 0.00 3,676.51
VRB-9A 11/8/2023 NS NS NS NS NS NS NS NS NS DRY (24.38)0.00
TOC:
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
VRB-11 5/9/2006 13 25 1.9 15 0.54 <0.013 210 310 NS 35.16 0.26 3,693.11
TOC:10/18/2007 14 30 2.7 20 0.73 <0.025 210 400 NS 31.07 0.37 3,697.28
3,728.07 9/16/2008 7.3 20 2.1 18 0.53 <0.013 120 400 NS 41.11 0.00 3,686.96
9/28/2009 3.4 15 1.9 16 0.56 <0.010 130 410 NS 35.43 0.00 3,692.64
9/26/2010 NS NS NS NS NS NS NS NS NS 39.47 0.14 3,688.71
12/10/2011 6.5 16 1.7 18 0.72 0.018 180 290 NS 33.15 0.00 3,694.92
12/10/2012 4.0 15 1.4 17 0.5 0.013 180 15 NS 33.80 0.00 3,694.27
6/23/2014 NS NS NS NS NS NS NS NS NS 40.00 0.12 3,688.16
9/28/2015 NS NS NS NS NS NS NS NS NS 32.51 0.15 3,695.67
3/19/2019 1.2 5.6 1.1 19 0.73 <0.002 180 260 NS 33.22 0.00 3,694.85
5/16/2019 1.6 6.6 1.0 12 0.63 <0.001 120 130 NS 34.46 0.00 3,693.61
12/10/2019 1.9 7.7 0.9 14 0.45 <0.010 140 2.9 NS 33.22 0.00 3,694.85
5/5/2020 NS NS NS NS NS NS NS NS NS 35.48 0.00 3,692.59
10/6/2020 DRY DRY DRY DRY DRY DRY DRY DRY NS 35.15 0.00 3,692.92
3/23/2021 2.55 12.1 V 1.43 17.5 V 0.408 J J3 J5 <0.0101 J3 139 467 NS 30.82 0.00 3,697.25
5/26/2021 2.97 10.8 1.52 16.1 0.460 J <0.0101 116 494 NS 32.95 0.00 3,695.12
8/3/2021 NS NS NS NS NS NS NS NS NS 37.87 0.00 3,690.20
11/4/2021 NS NS NS NS NS NS NS NS NS 34.11 0.00 3,693.96
VRB-11 11/9/2023 2.90 6.81 0.716 18.1 0.655 0.0117 J 136 298 213 32.18 0.00 3,695.89
VRB-11A 11/8/2023 NS NS NS NS NS NS NS NS NS 29.01 0.00
TOC:
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
Sample Ethyl-Total TPH-TPH-TPH-Product Water
Location benzene Xylenes GRO DRO DRO (w/SGT)DTW Thickness Elevation
TOC Date (mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(BTOC feet)(feet)(feet amsl)
0.005 1 0.70 10 0.70 0.20 1.00 1.00 1.00 ------
0.3 3 4 10 0.70 0.20 10 10 10 ------
Naphthalene
DERR ISL:
Tier 1 SL:
Toluene MTBEBenzene
VRB-12 5/9/2006 0.59 0.16 0.22 2.1 0.38 0.001 17 32 NS 31.21 0.00 3,687.90
TOC:10/18/2007 0.032 0.005 0.012 0.25 0.065 <0.0005 3.1 13 NS 27.99 0.00 3,691.12
3,719.11 9/16/2008 0.097 0.004 0.006 0.052 0.025 <0.0005 2.5 NS NS 30.05 0.00 3,689.06
9/28/2009 0.084 0.003 0.007 0.01 0.002 <0.0005 3.1 7.0 NS 34.22 0.00 3,684.89
9/26/2010 <0.005 <0.005 <0.005 <0.005 <0.01 <0.005 0.99 2.9 NS 35.60 0.00 3,683.51
12/10/2011 DRY DRY DRY DRY DRY DRY DRY DRY NS DRY (43.1')0.00 NC
12/10/2012 DRY DRY DRY DRY DRY DRY DRY DRY NS DRY (43.1')0.00 NC
6/23/2014 0.004 <0.0005 <0.0005 <0.0005 <0.0001 <0.0005 <0.022 <0.050 NS 28.91 0.00 3,690.20
9/28/2015 0.002 <0.0005 <0.0005 0.0005 0.002 <0.0005 0.044 <0.046 NS 29.14 0.00 3,689.97
5/16/2019 NS NS NS NS NS NS NS NS NS NM 0.00 NM
12/10/2019 NS NS NS NS NS NS NS NS NS NM 0.00 NM
5/5/2020 NS NS NS NS NS NS NS NS NS 29.95 0.00 3,689.16
10/6/2020 NS NS NS NS NS NS NS NS NS 43.11 0.00 3,676.00
3/23/2021 NS NS NS NS NS NS NS NS NS DRY (43.12)0.00 NC
5/26/2021 NS NS NS NS NS NS NS NS NS DRY (43.12)0.00 NC
8/3/2021 NS NS NS NS NS NS NS NS NS DRY (43.12)0.00 NC
11/4/2021 DRY DRY DRY DRY DRY DRY DRY DRY NS DRY (43.12)0.00 NC
VRB-12 11/8/2023 NS NS NS NS NS NS NS NS NS 19.56 0.00 3,699.55
VRB-12A 11/8/2023 NS NS NS NS NS NS NS NS NS 20.95 0.00
TOC:
See Notes on Page 8.
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Table 2
Groundwater Gauging and Analytical Data
Former Chevron Marina #7-2804
Halls Crossing Marina
Lake Powell, Utah
NoteSamples:
Bold indicates concentrations exceeding DERR ISL
ShadiTOCng indicates concentrations exceeding the Tier 1 SL
BTEX, Naphthalene, and MTBE analyzed by EPA method 8260B from June 2003 to present.
TPH-DRO analyzed by EPA method 8015B Modified.
TPH-GRO analyzed by EPA method 8015B Modified.
Values in bold exceed the ISLs or DERR policy levels.
Lake Powell's elevation was obtained from the U.S. Bureau of Reclamation website.
MRB-4 and MRB-5 were dry (since 9/28/2015).
All sample results may be biased high due to no purge sampling. No purge sampling completed due to communication limitations at the site during the sampling event.
Not representative of full three well volume purge because VRB-8 and VRB-11 went dry.
W ells were purged day before sampling to allow sufficient time for recharge; 0.98 well volumes purged from VRB-8 and 1.01 well volumes purged from VRB-11 on 11/08/2023. VRB-9 was grab-sampled on 11/09/23.
TPH-DRO AND TPH-GRO analyzed by EPA method 8015D in November 2023
Acronyms and Abbreviations:
µg/L = micrograms per liter NC = not calculated
amsl = above mean sea level ND = Not detected at concentrations at or above the method detection limit. The method detection
BTEX = benzene, toluene, ethylbenzene, and total xylenes limit is listed in the analytical report.
BTOC = below top of casing NS = not sampled for the specific parameter
DTW = depth to water SGT = silica gel treatment
EPA = United States Environmental Protection Agency SL = screening level
ISL = Division of Environmental Response and Remediation (DERR) Initial Screening Level TOC = top of casing elevation in feet above mean sea level
MTBE = methyl tert-butyl ether TPH-DRO = total petroleum hydrocarbons - diesel range organics
NM = not measured TPH-GRO = total petroleum hydrocarbons - gasoline range organics
NA = not analyzed J = The identification of the analyte is acceptable; the reported value is an estimate
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