HomeMy WebLinkAboutRTC WT Discharge_04-14-26OnSite 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
April 16, 2026
Ashley Kollmorgen
Encore Environmental LLC
P.O. Box 1150
Issaquah, WA 98027
Re: Analytical Data for Project Renton Transit Center
Laboratory Reference No. 2604-172
Dear Ashley:
Enclosed are the analytical results and associated quality control data for samples submitted on April 14, 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
Project: Renton Transit Center
Case Narrative
Samples were collected on April 14, 2026 and received by the laboratory on April 14, 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Gasoline ND 100 NWTPH-Gx 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
Fluorobenzene 88 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0415W1
Gasoline ND 100 NWTPH-Gx 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
Fluorobenzene 72 62-122
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 04-172-01
ORIG DUP
Gasoline ND ND NA NA NA NA NA 30
Surrogate:
Fluorobenzene 88 79 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Diesel Range Organics ND 250 NWTPH-Dx 4-14-26 4-14-26
Lube Oil Range Organics ND 250 NWTPH-Dx 4-14-26 4-14-26
Surrogate: Percent Recovery Control Limits
o-Terphenyl 98 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0414W1
Diesel Range Organics ND 250 NWTPH-Dx 4-14-26 4-14-26
Lube Oil Range Organics ND 250 NWTPH-Dx 4-14-26 4-14-26
Surrogate: Percent Recovery Control Limits
o-Terphenyl 101 50-150
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 04-172-01
ORIG DUP
Diesel Range ND ND NA NA NA NA NA 40
Lube Oil Range ND ND NA NA NA NA NA 40
Surrogate:
o-Terphenyl 98 94 50-150
SPIKE BLANK
Laboratory ID: SB0414W1
Diesel Fuel #2 388 500 NA 78 54-123 NA NA
Surrogate:
o-Terphenyl 94 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Acetone ND 5.0 EPA 8260D 4-15-26 4-15-26
2-Butanone ND 5.0 EPA 624.1 4-15-26 4-15-26
Benzene ND 0.20 EPA 8260D 4-15-26 4-15-26
Toluene ND 1.0 EPA 8260D 4-15-26 4-15-26
Ethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
m,p-Xylene ND 0.40 EPA 8260D 4-15-26 4-15-26
o-Xylene ND 0.20 EPA 8260D 4-15-26 4-15-26
n-Propylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,3,5-Trimethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,2,4-Trimethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
p-Isopropyltoluene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,2-Dichlorobenzene ND 0.20 EPA 624.1 4-15-26 4-15-26
n-Butylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
Dibromofluoromethane 106 68-133
Toluene-d8 102 79-123
4-Bromofluorobenzene 99 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0415W1
Acetone ND 5.0 EPA 8260D 4-15-26 4-15-26
2-Butanone ND 5.0 EPA 624.1 4-15-26 4-15-26
Benzene ND 0.20 EPA 8260D 4-15-26 4-15-26
Toluene ND 1.0 EPA 8260D 4-15-26 4-15-26
Ethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
m,p-Xylene ND 0.40 EPA 8260D 4-15-26 4-15-26
o-Xylene ND 0.20 EPA 8260D 4-15-26 4-15-26
n-Propylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,3,5-Trimethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,2,4-Trimethylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
p-Isopropyltoluene ND 0.20 EPA 8260D 4-15-26 4-15-26
1,2-Dichlorobenzene ND 0.20 EPA 624.1 4-15-26 4-15-26
n-Butylbenzene ND 0.20 EPA 8260D 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
Dibromofluoromethane 107 68-133
Toluene-d8 101 79-123
4-Bromofluorobenzene 101 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: 04-172-01
MS MSD MS MSD MS MSD
Acetone 9.33 8.37 10.0 10.0 ND 93 84 37-164 11 29
2-Butanone 10.1 9.76 10.0 10.0 ND 101 98 56-143 3 19
Benzene 10.3 10.4 10.0 10.0 ND 103 104 69-129 1 16
Toluene 9.29 9.43 10.0 10.0 ND 93 94 71-128 1 19
Ethylbenzene 9.30 9.34 10.0 10.0 ND 93 93 84-123 0 17
m,p-Xylene 18.9 18.9 20.0 20.0 ND 95 95 82-125 0 17
o-Xylene 9.42 9.49 10.0 10.0 ND 94 95 83-123 1 17
n-Propylbenzene 9.37 9.49 10.0 10.0 ND 94 95 77-130 1 16
1,3,5-Trimethylbenzene 9.30 9.37 10.0 10.0 ND 93 94 79-131 1 16
1,2,4-Trimethylbenzene 9.31 9.36 10.0 10.0 ND 93 94 78-130 1 16
p-Isopropyltoluene 9.45 9.56 10.0 10.0 ND 95 96 81-135 1 16
1,2-Dichlorobenzene 9.31 9.47 10.0 10.0 ND 93 95 80-130 2 16
n-Butylbenzene 9.81 9.91 10.0 10.0 ND 98 99 82-140 1 17
Surrogate:
Dibromofluoromethane 102 103 68-133
Toluene-d8 100 101 79-123
4-Bromofluorobenzene 104 103 78-117
SPIKE BLANK
Laboratory ID: SB0415W1
Acetone 8.23 10.0 82 45-135
2-Butanone 10.3 10.0 103 62-129
Benzene 10.6 10.0 106 75-126
Toluene 9.56 10.0 96 75-127
Ethylbenzene 9.53 10.0 95 80-124
m,p-Xylene 19.3 20.0 97 80-124
o-Xylene 9.63 10.0 96 80-123
n-Propylbenzene 9.54 10.0 95 80-129
1,3,5-Trimethylbenzene 9.46 10.0 95 79-128
1,2,4-Trimethylbenzene 9.39 10.0 94 80-128
p-Isopropyltoluene 9.58 10.0 96 80-132
1,2-Dichlorobenzene 9.35 10.0 94 79-125
n-Butylbenzene 9.74 10.0 97 78-138
Surrogate:
Dibromofluoromethane 103 68-133
Toluene-d8 101 79-123
4-Bromofluorobenzene 101 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Naphthalene ND 0.96 EPA 625.1 4-15-26 4-16-26
2-Methylnaphthalene ND 0.96 EPA 8270E 4-15-26 4-16-26
1-Methylnaphthalene ND 0.96 EPA 8270E 4-15-26 4-16-26
Phenanthrene ND 0.96 EPA 625.1 4-15-26 4-16-26
Fluoranthene ND 0.96 EPA 625.1 4-15-26 4-16-26
Pyrene ND 0.96 EPA 625.1 4-15-26 4-16-26
Chrysene ND 0.96 EPA 625.1 4-15-26 4-16-26
Benzo[b]fluoranthene ND 0.96 EPA 625.1 4-15-26 4-16-26
Benzo[a]pyrene ND 0.96 EPA 625.1 4-15-26 4-16-26
Benzo[g,h,i]perylene ND 0.96 EPA 625.1 4-15-26 4-16-26
Surrogate: Percent Recovery Control Limits
2-Fluorophenol 44 14 - 80
Phenol-d6 31 10 - 75
Nitrobenzene-d5 69 46 - 108
2-Fluorobiphenyl 72 37 - 103
2,4,6-Tribromophenol 72 35 - 123
Terphenyl-d14 81 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0415W1
Naphthalene ND 1.0 EPA 625.1 4-15-26 4-16-26
2-Methylnaphthalene ND 1.0 EPA 8270E 4-15-26 4-16-26
1-Methylnaphthalene ND 1.0 EPA 8270E 4-15-26 4-16-26
Phenanthrene ND 1.0 EPA 625.1 4-15-26 4-16-26
Fluoranthene ND 1.0 EPA 625.1 4-15-26 4-16-26
Pyrene ND 1.0 EPA 625.1 4-15-26 4-16-26
Chrysene ND 1.0 EPA 625.1 4-15-26 4-16-26
Benzo[b]fluoranthene ND 1.0 EPA 625.1 4-15-26 4-16-26
Benzo[a]pyrene ND 1.0 EPA 625.1 4-15-26 4-16-26
Benzo[g,h,i]perylene ND 1.0 EPA 625.1 4-15-26 4-16-26
Surrogate: Percent Recovery Control Limits
2-Fluorophenol 51 14 - 80
Phenol-d6 37 10 - 75
Nitrobenzene-d5 79 46 - 108
2-Fluorobiphenyl 80 37 - 103
2,4,6-Tribromophenol 80 35 - 123
Terphenyl-d14 91 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
Project: Renton Transit Center
PAHs EPA 625.1/8270E
QUALITY CONTROL
Matrix: Water
Units: ug/L
Percent Recovery RPD
Analyte Result Spike Level Recovery Limits RPD Limit Flags
SPIKE BLANKS
Laboratory ID: SB0415W1
SB SBD SB SBD SB SBD
Naphthalene 14.3 15.3 20.0 20.0 72 77 36 - 96 7 38
2-Methylnaphthalene 15.0 16.1 20.0 20.0 75 81 32 - 100 7 33
1-Methylnaphthalene 15.3 16.3 20.0 20.0 77 82 35 - 102 6 39
Phenanthrene 17.2 17.7 20.0 20.0 86 89 65 - 110 3 21
Fluoranthene 17.4 17.9 20.0 20.0 87 90 60 - 114 3 27
Pyrene 17.6 18.6 20.0 20.0 88 93 70 - 112 6 22
Chrysene 18.2 19.0 20.0 20.0 91 95 62 - 110 4 21
Benzo[b]fluoranthene 18.2 19.3 20.0 20.0 91 97 63 - 111 6 21
Benzo[a]pyrene 18.4 19.3 20.0 20.0 92 97 64 - 112 5 20
Benzo[g,h,i]perylene 18.3 19.3 20.0 20.0 92 97 63 - 110 5 20
Surrogate:
2-Fluorophenol 54 59 14 - 80
Phenol-d6 39 42 10 - 75
Nitrobenzene-d5 77 83 46 - 108
2-Fluorobiphenyl 79 83 37 - 103
2,4,6-Tribromophenol 81 85 35 - 123
Terphenyl-d14 87 92 47 - 115
MATRIX SPIKES
Laboratory ID: 04-172-01
MS MSD MS MSD MS MSD
Naphthalene 13.3 13.1 19.1 19.1 ND 70 69 22 - 101 2 37
2-Methylnaphthalene 13.9 14.1 19.1 19.1 ND 73 74 27 - 103 1 41
1-Methylnaphthalene 14.1 14.2 19.1 19.1 ND 74 74 29 - 105 1 41
Phenanthrene 15.3 16.4 19.1 19.1 ND 80 86 54 - 109 7 39
Fluoranthene 15.6 16.7 19.1 19.1 ND 82 87 54 - 118 7 39
Pyrene 15.7 16.5 19.1 19.1 ND 82 86 52 - 116 5 37
Chrysene 16.1 17.1 19.1 19.1 ND 84 90 54 - 113 6 41
Benzo[b]fluoranthene 16.2 17.0 19.1 19.1 ND 85 89 55 - 117 5 42
Benzo[a]pyrene 16.3 17.2 19.1 19.1 ND 85 90 52 - 118 5 42
Benzo[g,h,i]perylene 16.3 17.1 19.1 19.1 ND 85 90 57 - 111 5 40
Surrogate:
2-Fluorophenol 51 52 14 - 80
Phenol-d6 35 37 10 - 75
Nitrobenzene-d5 74 77 46 - 108
2-Fluorobiphenyl 75 77 37 - 103
2,4,6-Tribromophenol 77 81 35 - 123
Terphenyl-d14 81 84 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Aroclor 1016 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1221 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1232 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1242 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1248 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1254 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1260 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1262 ND 0.048 EPA 608.3 4-15-26 4-15-26
Aroclor 1268 ND 0.048 EPA 608.3 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
DCB 86 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0415W1
Aroclor 1016 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1221 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1232 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1242 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1248 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1254 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1260 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1262 ND 0.050 EPA 608.3 4-15-26 4-15-26
Aroclor 1268 ND 0.050 EPA 608.3 4-15-26 4-15-26
Surrogate: Percent Recovery Control Limits
DCB 92 53-130
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
MATRIX SPIKES
Laboratory ID: 04-172-01
MS MSD MS MSD MS MSD
Aroclor 1260 0.490 0.472 0.476 0.476 ND 103 99 51-136 4 17
Surrogate:
DCB 91 88 53-130
SPIKE BLANKS
Laboratory ID: SB0415W1
SB SBD SB SBD SB SBD
Aroclor 1260 0.491 0.477 0.500 0.500 N/A 98 95 60-129 3 24
Surrogate:
DCB 95 94 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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: RTC Water Treatment DP-08
Laboratory ID: 04-172-01
Arsenic ND 0.50 EPA 200.8 4-15-26 4-15-26
Cadmium ND 0.25 EPA 200.8 4-15-26 4-15-26
Chromium ND 1.0 EPA 200.8 4-15-26 4-15-26
Copper ND 2.0 EPA 200.8 4-15-26 4-15-26
Iron ND 50 EPA 200.7 4-15-26 4-15-26
Lead 5.7 0.50 EPA 200.8 4-15-26 4-15-26
Nickel 1.4 0.50 EPA 200.8 4-15-26 4-15-26
Zinc 22 2.5 EPA 200.8 4-15-26 4-15-26
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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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: MB0415WH2
Iron ND 50 EPA 200.7 4-15-26 4-15-26
Laboratory ID: MB0415WH1
Arsenic ND 0.50 EPA 200.8 4-15-26 4-15-26
Cadmium ND 0.25 EPA 200.8 4-15-26 4-15-26
Chromium ND 1.0 EPA 200.8 4-15-26 4-15-26
Copper ND 2.0 EPA 200.8 4-15-26 4-15-26
Lead ND 0.50 EPA 200.8 4-15-26 4-15-26
Nickel ND 0.50 EPA 200.8 4-15-26 4-15-26
Zinc ND 2.5 EPA 200.8 4-15-26 4-15-26
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 04-172-01
ORIG DUP
Iron ND ND NA NA NA NA NA 20
Laboratory ID: 04-089-02
Arsenic ND ND NA NA NA NA NA 20
Cadmium ND ND NA NA NA NA NA 20
Chromium ND ND NA NA NA NA NA 20
Copper 2.17 ND NA NA NA NA NA 20
Lead 2.41 2.22 NA NA NA NA 8 20
Nickel 1.38 0.556 NA NA NA NA 85 20
Zinc 20.7 18.4 NA NA NA NA 12 20
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: April 16, 2026
Samples Submitted: April 14, 2026
Laboratory Reference: 2603-057
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
MATRIX SPIKES
Laboratory ID: 04-172-01
MS MSD MS MSD MS MSD
Iron 20300 21500 20000 20000 ND 102 108 75-125 6 20
Laboratory ID: 04-089-02
Arsenic 109 104 100 100 ND 109 104 75-125 5 20
Cadmium 112 106 100 100 ND 112 106 75-125 5 20
Chromium 108 101 100 100 ND 108 101 75-125 6 20
Copper 105 98.3 100 100 2.17 103 96 75-125 6 20
Lead 102 98.8 100 100 2.41 100 96 75-125 3 20
Nickel 104 96.6 100 100 1.38 103 95 75-125 8 20
Zinc 135 130 100 100 20.7 115 109 75-125 4 20
SPIKE BLANK
Laboratory ID: SB0415WH2
Iron 21700 20000 N/A 109 85-115
Laboratory ID: SB0415WH1
Arsenic 97.9 100 N/A 98 85-115
Cadmium 98.8 100 N/A 99 85-115
Chromium 97.4 100 N/A 97 85-115
Copper 94.0 100 N/A 94 85-115
Lead 92.9 100 N/A 93 85-115
Nickel 93.5 100 N/A 94 85-115
Zinc 101 100 N/A 101 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