HomeMy WebLinkAboutRTC Batch 1 RETEST_03-10-26OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
March 12, 2026
Ashley Kollmorgen
Encore Environmental LLC
P.O. Box 1150
Issaquah, WA 98027
Re: Analytical Data for Project Renton Transit Center
Laboratory Reference No. 2603-121
Dear Ashley:
Enclosed are the analytical results and associated quality control data for samples submitted on March 10, 2026.
The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you
require longer storage, please contact the laboratory.
We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data,
or need additional information, please feel free to call me.
Sincerely,
David Baumeister
Project Manager
Enclosures
2
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
Case Narrative
Samples were collected on March 10, 2026 and received by the laboratory on March 10, 2026. They were
maintained at the laboratory at a temperature of 2oC to 6oC.
Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below.
However the soil results for the QA/QC samples are reported on a wet-weight basis.
General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a
reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be
discussed in detail below.
3
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
GASOLINE RANGE ORGANICS
NWTPH-Gx
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Gasoline ND 100 NWTPH-Gx 3-12-26 3-12-26
Surrogate: Percent Recovery Control Limits
Fluorobenzene 75 62-122
4
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
GASOLINE RANGE ORGANICS
NWTPH-Gx
QUALITY CONTROL
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0312W1
Gasoline ND 100 NWTPH-Gx 3-12-26 3-12-26
Surrogate: Percent Recovery Control Limits
Fluorobenzene 81 62-122
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 03-121-01
ORIG DUP
Gasoline ND ND NA NA NA NA NA 30
Surrogate:
Fluorobenzene 75 77 62-122
5
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
DIESEL AND HEAVY OIL RANGE ORGANICS
NWTPH-Dx
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Diesel Range Organics ND 250 NWTPH-Dx 3-11-26 3-11-26
Lube Oil Range Organics ND 250 NWTPH-Dx 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
o-Terphenyl 79 50-150
6
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
DIESEL AND HEAVY OIL RANGE ORGANICS
NWTPH-Dx
QUALITY CONTROL
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0311W1
Diesel Range Organics ND 250 NWTPH-Dx 3-11-26 3-11-26
Lube Oil Range Organics ND 250 NWTPH-Dx 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
o-Terphenyl 95 50-150
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: SB0311W1
ORIG DUP
Diesel Fuel #2 580 499 NA NA NA NA 15 40
Surrogate:
o-Terphenyl 119 103 50-150
SPIKE BLANK
Laboratory ID: SB0311W1
Diesel Fuel #2 580 500 NA 116 54-123 NA NA
Surrogate:
o-Terphenyl 119 50-150
7
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
VOLATILE ORGANICS EPA 8260D/624.1
Matrix: Water
Units: ug/L
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Acetone ND 5.0 EPA 8260D 3-10-26 3-10-26
2-Butanone ND 5.0 EPA 624.1 3-10-26 3-10-26
Benzene ND 0.20 EPA 8260D 3-10-26 3-10-26
Toluene ND 1.0 EPA 8260D 3-10-26 3-10-26
Ethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
m,p-Xylene ND 0.40 EPA 8260D 3-10-26 3-10-26
o-Xylene ND 0.20 EPA 8260D 3-10-26 3-10-26
n-Propylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,3,5-Trimethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,2,4-Trimethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
p-Isopropyltoluene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,2-Dichlorobenzene ND 0.20 EPA 624.1 3-10-26 3-10-26
n-Butylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
Surrogate: Percent Recovery Control Limits
Dibromofluoromethane 106 68-133
Toluene-d8 101 79-123
4-Bromofluorobenzene 98 78-117
8
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
VOLATILE ORGANICS EPA 8260D/624.1
QUALITY CONTROL
Matrix: Water
Units: ug/L
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0310W1
Acetone ND 5.0 EPA 8260D 3-10-26 3-10-26
2-Butanone ND 5.0 EPA 624.1 3-10-26 3-10-26
Benzene ND 0.20 EPA 8260D 3-10-26 3-10-26
Toluene ND 1.0 EPA 8260D 3-10-26 3-10-26
Ethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
m,p-Xylene ND 0.40 EPA 8260D 3-10-26 3-10-26
o-Xylene ND 0.20 EPA 8260D 3-10-26 3-10-26
n-Propylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,3,5-Trimethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,2,4-Trimethylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
p-Isopropyltoluene ND 0.20 EPA 8260D 3-10-26 3-10-26
1,2-Dichlorobenzene ND 0.20 EPA 624.1 3-10-26 3-10-26
n-Butylbenzene ND 0.20 EPA 8260D 3-10-26 3-10-26
Surrogate: Percent Recovery Control Limits
Dibromofluoromethane 107 68-133
Toluene-d8 100 79-123
4-Bromofluorobenzene 98 78-117
9
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
VOLATILE ORGANICS EPA 8260D/624.1
QUALITY CONTROL
Matrix: Water
Units: ug/L
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
MATRIX SPIKES
Laboratory ID: 02-114-01
MS MSD MS MSD MS MSD
Acetone 13.6 12.4 10.0 10.0 ND 136 124 37-164 9 29
2-Butanone 10.4 10.4 10.0 10.0 ND 104 104 56-143 0 19
Benzene 10.4 10.2 10.0 10.0 ND 104 102 69-129 2 16
Toluene 9.31 9.22 10.0 10.0 ND 93 92 71-128 1 19
Ethylbenzene 9.79 9.55 10.0 10.0 ND 98 96 84-123 2 17
m,p-Xylene 19.9 19.3 20.0 20.0 ND 100 97 82-125 3 17
o-Xylene 9.74 9.46 10.0 10.0 ND 97 95 83-123 3 17
n-Propylbenzene 10.4 9.75 10.0 10.0 ND 104 98 77-130 6 16
1,3,5-Trimethylbenzene 10.3 9.75 10.0 10.0 ND 103 98 79-131 5 16
1,2,4-Trimethylbenzene 10.1 9.58 10.0 10.0 ND 101 96 78-130 5 16
p-Isopropyltoluene 10.4 9.93 10.0 10.0 ND 104 99 81-135 5 16
1,2-Dichlorobenzene 10.4 9.97 10.0 10.0 ND 104 100 80-130 4 16
n-Butylbenzene 10.1 9.76 10.0 10.0 ND 101 98 82-140 3 17
Surrogate:
Dibromofluoromethane 106 107 68-133
Toluene-d8 100 102 79-123
4-Bromofluorobenzene 99 100 78-117
SPIKE BLANK
Laboratory ID: SB0310W1
Acetone 11.1 10.0 111 45-135
2-Butanone 10.5 10.0 105 62-129
Benzene 10.2 10.0 102 75-126
Toluene 9.31 10.0 93 75-127
Ethylbenzene 9.65 10.0 97 80-124
m,p-Xylene 19.7 20.0 99 80-124
o-Xylene 9.64 10.0 96 80-123
n-Propylbenzene 9.86 10.0 99 80-129
1,3,5-Trimethylbenzene 9.91 10.0 99 79-128
1,2,4-Trimethylbenzene 9.66 10.0 97 80-128
p-Isopropyltoluene 10.0 10.0 100 80-132
1,2-Dichlorobenzene 10.0 10.0 100 79-125
n-Butylbenzene 9.85 10.0 99 78-138
Surrogate:
Dibromofluoromethane 106 68-133
Toluene-d8 100 79-123
4-Bromofluorobenzene 100 78-117
10
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
PAHs EPA 625.1/8270E
Matrix: Water
Units: ug/L
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Naphthalene ND 0.95 EPA 625.1 3-11-26 3-11-26
2-Methylnaphthalene ND 0.95 EPA 8270E 3-11-26 3-11-26
1-Methylnaphthalene ND 0.95 EPA 8270E 3-11-26 3-11-26
Phenanthrene ND 0.95 EPA 625.1 3-11-26 3-11-26
Fluoranthene ND 0.95 EPA 625.1 3-11-26 3-11-26
Pyrene ND 0.95 EPA 625.1 3-11-26 3-11-26
Chrysene ND 0.95 EPA 625.1 3-11-26 3-11-26
Benzo[b]fluoranthene ND 0.95 EPA 625.1 3-11-26 3-11-26
Benzo[a]pyrene ND 0.95 EPA 625.1 3-11-26 3-11-26
Benzo[g,h,i]perylene ND 0.95 EPA 625.1 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
2-Fluorophenol 48 14 - 80
Phenol-d6 34 10 - 75
Nitrobenzene-d5 78 46 - 108
2-Fluorobiphenyl 76 37 - 103
2,4,6-Tribromophenol 76 35 - 123
Terphenyl-d14 88 47 - 115
11
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
PAHs EPA 625.1/8270E
QUALITY CONTROL
Matrix: Water
Units: ug/L
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0311W1
Naphthalene ND 1.0 EPA 625.1 3-11-26 3-11-26
2-Methylnaphthalene ND 1.0 EPA 8270E 3-11-26 3-11-26
1-Methylnaphthalene ND 1.0 EPA 8270E 3-11-26 3-11-26
Phenanthrene ND 1.0 EPA 625.1 3-11-26 3-11-26
Fluoranthene ND 1.0 EPA 625.1 3-11-26 3-11-26
Pyrene ND 1.0 EPA 625.1 3-11-26 3-11-26
Chrysene ND 1.0 EPA 625.1 3-11-26 3-11-26
Benzo[b]fluoranthene ND 1.0 EPA 625.1 3-11-26 3-11-26
Benzo[a]pyrene ND 1.0 EPA 625.1 3-11-26 3-11-26
Benzo[g,h,i]perylene ND 1.0 EPA 625.1 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
2-Fluorophenol 60 14 - 80
Phenol-d6 43 10 - 75
Nitrobenzene-d5 93 46 - 108
2-Fluorobiphenyl 88 37 - 103
2,4,6-Tribromophenol 83 35 - 123
Terphenyl-d14 94 47 - 115
12
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
PAHs EPA 625.1/8270E
QUALITY CONTROL
Matrix: Water
Units: ug/L
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
MATRIX SPIKES
Laboratory ID: 03-115-01
MS MSD MS MSD MS MSD
Naphthalene 14.5 14.2 18.9 18.9 ND 77 75 22 - 101 2 37
2-Methylnaphthalene 15.1 14.6 18.9 18.9 ND 80 77 27 - 103 3 41
1-Methylnaphthalene 15.2 14.9 18.9 18.9 ND 80 79 29 - 105 2 41
Phenanthrene 17.7 17.0 18.9 18.9 ND 94 90 54 - 109 4 39
Fluoranthene 17.4 16.8 18.9 18.9 ND 92 89 54 - 118 4 39
Pyrene 18.4 18.1 18.9 18.9 ND 97 96 52 - 116 2 37
Chrysene 18.0 17.5 18.9 18.9 ND 95 93 54 - 113 3 41
Benzo[b]fluoranthene 17.9 17.7 18.9 18.9 ND 95 94 55 - 117 1 42
Benzo[a]pyrene 17.9 17.5 18.9 18.9 ND 95 93 52 - 118 2 42
Benzo[g,h,i]perylene 17.5 17.2 18.9 18.9 ND 93 91 57 - 111 2 40
Surrogate:
2-Fluorophenol 54 52 14 - 80
Phenol-d6 37 36 10 - 75
Nitrobenzene-d5 91 89 46 - 108
2-Fluorobiphenyl 88 85 37 - 103
2,4,6-Tribromophenol 84 83 35 - 123
Terphenyl-d14 92 90 47 - 115
SPIKE BLANKS
Laboratory ID: SB0311W1
SB SBD SB SBD SB SBD
Naphthalene 15.3 15.9 20.0 20.0 77 80 36 - 96 4 38
2-Methylnaphthalene 15.8 16.2 20.0 20.0 79 81 32 - 100 2 33
1-Methylnaphthalene 16.2 16.7 20.0 20.0 81 84 35 - 102 3 39
Phenanthrene 18.6 18.8 20.0 20.0 93 94 65 - 110 1 21
Fluoranthene 18.5 18.8 20.0 20.0 93 94 60 - 114 2 27
Pyrene 19.8 19.9 20.0 20.0 99 100 70 - 112 1 22
Chrysene 19.3 19.2 20.0 20.0 97 96 62 - 110 1 21
Benzo[b]fluoranthene 19.3 19.5 20.0 20.0 97 98 63 - 111 1 21
Benzo[a]pyrene 19.0 19.1 20.0 20.0 95 96 64 - 112 1 20
Benzo[g,h,i]perylene 18.6 18.7 20.0 20.0 93 94 63 - 110 1 20
Surrogate:
2-Fluorophenol 62 63 14 - 80
Phenol-d6 45 45 10 - 75
Nitrobenzene-d5 95 95 46 - 108
2-Fluorobiphenyl 91 93 37 - 103
2,4,6-Tribromophenol 84 86 35 - 123
Terphenyl-d14 95 94 47 - 115
13
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
PCBs EPA 608.3
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Aroclor 1016 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1221 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1232 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1242 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1248 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1254 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1260 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1262 ND 0.049 EPA 608.3 3-11-26 3-11-26
Aroclor 1268 ND 0.049 EPA 608.3 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
DCB 90 53-130
14
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
PCBs EPA 608.3
QUALITY CONTROL
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0311W1
Aroclor 1016 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1221 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1232 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1242 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1248 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1254 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1260 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1262 ND 0.050 EPA 608.3 3-11-26 3-11-26
Aroclor 1268 ND 0.050 EPA 608.3 3-11-26 3-11-26
Surrogate: Percent Recovery Control Limits
DCB 99 53-130
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
SPIKE BLANKS
Laboratory ID: SB0311W1
SB SBD SB SBD SB SBD
Aroclor 1260 0.420 0.409 0.500 0.500 N/A 84 82 60-129 3 24
Surrogate:
DCB 93 91 53-130
15
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
TOTAL METALS
EPA 200.8/200.7
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Batch 1 Post Treatment Retest
Laboratory ID: 03-121-01
Arsenic 0.90 0.50 EPA 200.8 3-11-26 3-11-26
Cadmium ND 0.25 EPA 200.8 3-11-26 3-11-26
Chromium ND 1.0 EPA 200.8 3-11-26 3-11-26
Copper ND 2.0 EPA 200.8 3-11-26 3-11-26
Iron ND 50 EPA 200.7 3-11-26 3-11-26
Lead ND 0.50 EPA 200.8 3-11-26 3-11-26
Nickel 1.5 0.50 EPA 200.8 3-11-26 3-11-26
Zinc ND 2.5 EPA 200.8 3-11-26 3-11-26
16
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
TOTAL METALS
EPA 200.8/200.7
QUALITY CONTROL
Matrix: Water
Units: ug/L (ppb)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0311WH2
Iron ND 50 EPA 200.7 3-11-26 3-11-26
Laboratory ID: MB0311WH1
Arsenic ND 0.50 EPA 200.8 3-11-26 3-11-26
Cadmium ND 0.25 EPA 200.8 3-11-26 3-11-26
Chromium ND 1.0 EPA 200.8 3-11-26 3-11-26
Copper ND 2.0 EPA 200.8 3-11-26 3-11-26
Lead ND 0.50 EPA 200.8 3-11-26 3-11-26
Nickel ND 0.50 EPA 200.8 3-11-26 3-11-26
Zinc ND 2.5 EPA 200.8 3-11-26 3-11-26
17
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: March 12, 2026
Samples Submitted: March 10, 2026
Laboratory Reference: 2603-121
Project: Renton Transit Center
TOTAL METALS
EPA 200.8/200.7
QUALITY CONTROL
Matrix: Water
Units: ug/L (ppb)
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 03-091-01
ORIG DUP
Iron 896 890 NA NA NA NA 1 20
Laboratory ID: 03-011-02
Arsenic 1.52 1.43 NA NA NA NA 6 20
Cadmium ND ND NA NA NA NA NA 20
Chromium ND ND NA NA NA NA NA 20
Copper ND ND NA NA NA NA NA 20
Lead ND ND NA NA NA NA NA 20
Nickel 0.765 0.732 NA NA NA NA 4 20
Zinc 4.98 4.68 NA NA NA NA 6 20
MATRIX SPIKES
Laboratory ID: 03-091-01
MS MSD MS MSD MS MSD
Iron 22100 21300 20000 20000 896 106 102 75-125 4 20
Laboratory ID: 03-011-02
Arsenic 95.6 93.5 100 100 1.52 94 92 75-125 2 20
Cadmium 91.2 93.3 100 100 ND 91 93 75-125 2 20
Chromium 95.2 94.7 100 100 ND 95 95 75-125 1 20
Copper 94.9 95.4 100 100 ND 95 95 75-125 1 20
Lead 85.0 86.4 100 100 ND 85 86 75-125 2 20
Nickel 91.8 93.2 100 100 0.765 91 92 75-125 2 20
Zinc 101 101 100 100 4.98 96 96 75-125 0 20
SPIKE BLANK
Laboratory ID: SB0311WH2
Iron 20400 20000 N/A 102 85-115
Laboratory ID: SB0311WH1
Arsenic 98.9 100 N/A 99 85-115
Cadmium 99.3 100 N/A 99 85-115
Chromium 102 100 N/A 102 85-115
Copper 104 100 N/A 104 85-115
Lead 91.0 100 N/A 91 85-115
Nickel 100 100 N/A 100 85-115
Zinc 102 100 N/A 102 85-115
18
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1 - Sample extract treated with a sulfuric acid/silica gel cleanup procedure. X2 - Sample extract treated with a silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in methods 8260 & 8270, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Y1 - Negative effects of the matrix from this sample on the instrument caused values for this analyte in the bracketing continuing calibration verification standard (CCVs) to be outside of 20% acceptance criteria. Because of this, quantitation limits and sample concentrations should be considered estimates. Z -
ND - Not Detected at PQL
PQL - Practical Quantitation Limit
RPD - Relative Percent Difference