HomeMy WebLinkAboutSWP273529-5wp 'i:71LL
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Contaminated Soils and
Groundwater Report
Lake Avenue South Storm
System Project
(SWP-27-3529)
March 2011
Parametrix
CITATION
Parametrix. 2011. Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529).
Prepared by Parametrix, Puyallup, Washington. March 2011.
CERTIFICATION
The technical material and data contained
supervision and direction of the undersigned,
licensed to practice as such, is affixed below.
1
Prepared by Michael R. Warfel, LG, LHG
ak-' ,u U4.
Checked by Lisa A. Gilbert, LG, LHG
Approved by Kenneth T. Fellows, P.E.
March 2011 1218-1779-036
Contaminated Soils and Groundtvater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
in this document were prepared under the
whose seal, as a professional Hydrogeologist
TABLE OF CONTENTS
1. BACKGROUND AND PURPOSE
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
....................1-1
2. STATUS OF ADJACENT CONTAMINATED SITES.........................................2-1
2.1 SAFEWAY PROPERTY.......................................................................................2-1
2.2 WALKER'S RENTON SUBARU PROPERTY....................................................2-1
2.3 DISCUSSION WITH ECOLOGY REPRESENTATIVE......................................2-2
3. SOIL SAMPLING DURING GEOTECHNICAL DRILLING................................3-1
4. MANAGEMENT OF CONTAMINATED SOILS AND GROUNDWATER
DURING CONSTRUCTION...............................................................................4-1
4.1 POTENTIAL FOR ENCOUNTERING CONTAMINATION..............................4-1
4.1.1 Soil Contamination.......................................................................................4-1
4.1.2 Groundwater Contamination........................................................................4-1
4.2 SOIL AND GROUNDWATER MANAGEMENT APPROACH .........................4-1
4.3 WORKER HEALTH AND SAFETY CONSIDERATIONS................................4-1
5. REFERENCES...................................................................................................5-1
LIST OF FIGURES
1-1 Project Location.....................................................................................................1-3
4-1 Location of Potential Soil and Groundwater Contamination.................................4-3
LIST OF TABLES
3-1 Data for Soil Samples Collected from Geotechnical Borings................................3-1
APPENDICES
A Information from Safeway Site Ecology File
B Information from Walker's Renton Subaru Site Ecology File
C Laboratory Report for Soil Samples Collected During Project Geotechnical
Investigation
D Contaminated Soil and Groundwater Management Plan
Much 2011 1 218-1779-036 i
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP_27-3529)
City of Renton
KEY TERMS
µg/L
micrograms per liter
bgs
below ground surface
City
City of Renton
Ecology
Department of Ecology
HAZWOPER
hazardous waste operations
mg/kg
milligrams per kilogram
MTCA
Model Toxics Control Act
TPH
total petroleum hydrocarbons
UST
underground fuel storage tank
March 2011 1 218-1779-036 iii
Contaminated Soils and Groundwater Report I
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
BACKGROUND AND PURPOSE
The Lake Avenue South Storm System project proposes to replace a portion of the existing City
of Renton (City) storm drain system from the intersection of South 2nd Street and Lake Avenue
South, to the intersection of Rainier Avenue South and South 3rd Street (Figure 1-1). The
existing storm system is located within an existing utility easement that was formed when the
Lake Avenue South right-of-way was vacated between South 2nd Street and South 3rd Street.
Based on information provided by the City, flooding has occurred on Lake Avenue South, north
of 2nd Street. During intense or prolonged rainfall, water has overtopped the curbs and flooded
the properties on the west and east sides of Lake Avenue South.
The scope of this project task included the following:
• Obtain information regarding documented soil and groundwater contamination
adjacent to the storm drain on the Safeway and Walker's Renton Subaru properties;
• Test soil samples collected during drilling of geotechnical borings at the project site
and test these samples for the presence of petroleum hydrocarbons;
• Assess the potential for encountering contaminated soils and groundwater during
project construction (to be conducted by the boring and jacking method) involving
soil excavation work and construction dewatering;
• Develop an approach to managing contaminated soil and groundwater that could be
encountered during construction; and
• Document the methods, findings, and recommendations of this task in a report.
March 2011 1218-1779-036 171
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FOR CITY UTILITIES
Figure 1-1
Project Location
Lake Ave S / Rainier Ave S
Storm System Project
City of Renton Surface Water Utility
Contaminated Soils and Groundwater Report I
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
2. STATUS OF ADJACENT CONTAMINATED SITES
Parametrix reviewed files at the Department of Ecology (Ecology) office in Bellevue,
Washington, in March 2010 to obtain information about former underground fuel storage
tank (UST) leaks at locations of the current Safeway and Walker's Renton Subaru properties.
Both of these properties are listed by Ecology as sites of ongoing contamination cleanup. The
following descriptions of each contaminated site were obtained from this file information.
2.1 SAFEWAY PROPERTY
Safeway previously operated a smaller store on the property and retained an environmental
consultant in 1996 to assess adjacent property purchased to build a larger store. A review of
historical site records indicated that a gasoline service station formerly operated on the south
side of the property and that the USTs may not have been removed. Subsequent subsurface
investigations identified soil and groundwater contamination from gasoline -range compounds
and the presence of three USTs (two 800-gallon tanks and one 1,000-gallon tank). The tanks
were removed in May 1999, followed by excavation and off -site treatment of 1,160 tons of
petroleum -contaminated soil (Environmental Partners, Inc. 1999). Former locations of these
tanks and the contaminated soil excavation are shown in Appendix A.
During the site investigation and remediation, groundwater was encountered at
10 feet below ground surface (bgs). Based on data collected from monitoring wells
subsequently installed at the site, the groundwater flow direction beneath the site is generally
towards the west (see Appendix A).
Groundwater monitoring at the Safeway site has continued since 1999. The most recent
monitoring report in Ecology files was prepared by Environmental Partners in
November 2009 and showed the continued presence of gasoline -range hydrocarbons above
the Ecology Model Toxics Control Act (MTCA) cleanup levels in monitoring well MW-1
(see Appendix A). MW-1 is located in the southwest corner of the Safeway property, adjacent
to the Walker's Renton Subaru property. The TPH-gasoline concentration at MW-1 in
September 2009 was 1,600 micrograms per liter (µg/L), compared to the MTCA Method A
cleanup level of 1,000 µg/L. Groundwater monitoring continues on a semi-annual schedule
and is the responsibility of Safeway, Inc.
2.2 WALKER'S RENTON SUBARU PROPERTY
An environmental assessment of this property completed in 1996 by Groundwater Technology,
Inc. documented the presence of soil and groundwater contamination from three former
10,000-gallon USTs at the locations shown in Appendix B. A smaller UST associated with a
former Texaco service station was also reportedly located on the property adjacent to Rainier
Avenue South. A total of 100 tons of gasoline -contaminated soil was removed from the former
pump island area and treated off -site (Adapt Engineering 2000). Approximately 10 tons of
petroleum -contaminated soil was left in the ground near the northwest comer of the former pump
island (see Appendix B). Data from soil borings in this area indicated concentrations of
TPH-gasoline up to 1,200 milligrams per kilogram (mg/kg), which is above the MTCA Method A
cleanup level of 100 mg/kg.
Groundwater sampling conducted between 1996 and 2000 indicated contamination from
diesel fuel in the eastern part of the site and gasoline in the vicinity of the three large former
USTs (Adapt Engineering 2000). In -place treatment with oxygen -release compound in
monitoring wells MW-I, MW-2, and MW-4 (see Appendix B) reportedly reduced
contaminant concentrations in groundwater below cleanup levels by January 2000.
March 2011 1 218-1779-036 2-1
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
During the site investigation and remediation at the Walker's Renton Subaru site,
groundwater was encountered at 10 feet bgs. Based on data collected during the site
investigation, the groundwater flow direction beneath the site is generally towards the west
(see Appendix B).
No data regarding TPH concentrations in soil or groundwater after 2000 were available in the
Ecology file. The file included correspondence from June 2000 that documents a "No Further
Action" letter for soils on the site, provided that a restrictive covenant on the property is filed
with the King County Assessor's Office. The restrictive covenant prohibits any activities on
the site that have the potential to cause contact with, or a release of, TPH-contaminated soil
without prior written authorization from Ecology.
2.3 DISCUSSION WITH ECOLOGY REPRESENTATIVE
Parametrix obtained the following Ecology contact from the project file correspondence and
called him for information regarding the status of the two contaminated sites and potential
impacts of the Lake Avenue storm sewer construction on these sites:
Mark Adams, Hydrogeologist
Toxics Cleanup Program
Northwest Regional Office
Washington State Department of Ecology
Bellevue, Washington
Telephone:425-649-7107
Email: mada461@ecy.wa.gov
Mr. Adams confirmed that the Safeway and Walker Renton Subaru sites are included on the
Ecology Confirmed and Suspected Contaminated Sites List, indicating that cleanup has not
been completed at either facility. He noted that both sites are or were part of the Voluntary
Cleanup Program and that neither site was the subject of a cleanup order by Ecology or a
restrictive covenant that requires Ecology approval of any actions that could affect existing
soil and groundwater contamination. Therefore, any construction activities associated with
the Lake Avenue sewer project that potentially involve contaminated soil or groundwater do
not require approval by Ecology, but do need to comply with the MTCA regulations to ensure
the protection of human health and the environment. Mr. Adams appreciated the coordination
with Ecology on this project.
2-2 March 2011 1218-1779-036
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3519)
City of Renton
3. SOIL SAMPLING DURING GEOTECHNICAL DRILLING
Three geotechnical borings were drilled at the project site on March 3, 2010, at the locations
shown on Figure 1-1 to assess engineering properties of soils along the storm sewer
alignment. A Parametrix hydrogeologist was present during the drilling work to view soil
samples from the borings and collected soil samples for laboratory analysis of TPH. Results
of the soil sampling are summarized below in Table 3-1. The chemical results are expressed
in milligrams of contaminant per kilogram of soil (mg/kg). Laboratory reports are provided in
Appendix C.
Table 3-1. Data for Soil Samples Collected from Geotechnical Borings
Boring / Sample Number: B-1 / 7.5 B-1 / 10 B-2 17.5 B-3 / 7.5
Sample Depth (feet below ground):
7.5
10
7.5
7.5
Depth to Groundwater (feet):
10
10
9
10.5
Parameters Units MTCA A
TPH-Diesel mg/kg 2,000
27 U
260 U`
45 U
27 U
TPH-Motor Oil mg/kg 2,000
53 U
2,600
90
450
TPH-Gasoline mg/kg 30/100
5 U
7.1 U
14 U
4.7 U
Notes:
U = Not detected above specified detection limit.
Detection limit elevated due to interference from motor -oil range compounds.
mg/kg = milligrams per kilogram.
Model Toxics Control Act (MTCA) from Washington Administrative Code 173-340.
MTCA Method A Soil Cleanup Levels for Unrestricted Land Use: Table 740-1.
Shaded values indicate a result that is above the MTCA cleanup level and must be disposed of at a permitted facility if
removed from the ground.
The depths of the soil samples were selected by the Parametrix field geologist, based on
sample appearance and odor. Of the three samples, only the 10-foot sample from Boring B-1
showed a result slightly above the MTCA cleanup level (for TPH in the motor -oil range).
Because of this result, the soil from Boring B-1 was sent to a permitted facility for disposal.
The sampling results indicate that TPH in the soil can be encountered in areas of the project
site that are not within, or directly adjacent to, known prior locations of gasoline service
stations or associated fuel USTs. The result at Boring B-1 is likely due to the presence of low
levels of TPH in the material that was used to fill the area prior to development. Boring B-2
was located outside of the area of the former gasoline station that contaminated groundwater
on the Safeway property and was not expected to show soil contamination. The boring closest
to the former USTs on the Walker's Renton Subaru property (Boring B-3) is in the area
where soil was excavated and remediated and, therefore, would not be expected to show TPH
greater than MTCA cleanup levels in this area. Groundwater was observed in the three
borings at an approximate depth of 10 feet.
March 2011 1218-1779-036 3-1
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
4. MANAGEMENT OF CONTAMINATED SOILS AND
GROUNDWATER DURING CONSTRUCTION
4.1 POTENTIAL FOR ENCOUNTERING CONTAMINATION
4.1.1 Soil Contamination
Data from Ecology files for the two contaminated sites, and results from the soil samples
collected from the geotechnical borings, indicate that petroleum hydrocarbons may be
encountered in soils throughout the project area. Therefore, soils excavated during
construction of this project must be evaluated visually and analytically for the presence of
petroleum hydrocarbons, to allow for appropriate disposal options to be selected.
The greatest potential for encountering TPH-contaminated soil that exceeds cleanup levels
will likely occur along the southern segment of the storm sewer replacement project, on the
Walker's Renton Subaru property where the boring for the new sewer pipe will pass through
or near the area identified by Adapt Engineering (1999) as the "estimated area of residual
TPH-gasoline and benzene contaminated soil" (Figure 4-1). The soil boring nearest to this
area shown in the Adapt report indicated a TPH-gasoline concentration of 1,200 mg/kg. The
potential also exists for encountering TPH in soil along the northern segment of the project
near Test Boring B-1.
4.1.2 Groundwater Contamination
Groundwater contaminated with petroleum hydrocarbons has been documented beneath both
the Safeway and Walker's Renton Subaru sites. Concentrations of TPH in groundwater at the
Safeway site have been consistently monitored for a number of years and currently are localized
in the vicinity of monitoring well MW-1 (in the southwest corner of the Safeway property [see
Figure 4-1]). As noted above in Section 2.1, the TPH-gasoline concentration at MW-1 in
September 2009 was 1,600 µg/L (compared to the cleanup level of 1,000 µg/L), and TPH
concentrations in groundwater at the Walker's Renton Subaru site were reportedly below the
cleanup level in 2000. The TPH-gasoline concentration contours shown on Figure 4-1 were
mapped by Environmental Partners (2009) and do not extend beyond the area near well MW-1
where they had collected samples.
The dewatering system required to drop the elevation of the water table prior to pipeline
construction for the project will intercept groundwater from beneath both the Safeway and
Walker's Renton Subaru properties; therefore, the discharge from the dewatering system will
potentially contain detectable concentrations of TPH-gasoline.
4.2 SOIL AND GROUNDWATER MANAGEMENT APPROACH
Parametrix prepared a Soil and Groundwater Management Plan for inclusion in the bid
specifications which is included in Appendix D.
4.3 WORKER HEALTH AND SAFETY CONSIDERATIONS
Federal and State regulations require that personnel working on a contaminated site that is on
a State or Federal contaminated site list (such as the Safeway and Walker's Renton Subaru
sites) have appropriate training and carry out work under a formal Health and Safety Plan.
Therefore, the plans and specifications will require contractor personnel who may come in
contact with contaminated soils and groundwater to have 40-hour hazardous waste operations
March 2011 1 218-1779-036 4-1
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
(HAZWOPER) training and an up-to-date annual HAZWOPER refresher course certificate.
The contractor will also be required to retain a Certified Industrial Hygienist to develop a
Health and Safety Plan for on -site workers.
4-2 March 2011.I 218-1779-036
C
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APPENDIX A
Information from
Safeway Site Ecology File
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APPENDIX B
Information from
Walker's Renton Subaru Site Ecology File
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APPENDIX C
Laboratory Report for Soil Samples Collected
During Project Geotechnical Investigation
4:,
OnSite
Environmental Inc.
14648 NE 95th Street, Redmond, WA 98052 • (425) 883-3881
March 11, 2010
Mike Warfel
Parametrix, Inc.
1231 Fryar Avenue
Sumner, WA 98390
Re: Analytical Data for Project 218 1779 036 01 05
Laboratory Reference No. 1003-029
Dear Mike:
Enclosed are the analytical results and associated quality control data for samples submitted on
March 3, 2010.
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
OnSite Environmental, Inc. 14648 NE 95"' 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.
2
Date of Report: March 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
Case Narrative
Samples were collected on March 3, 2010, and received by the laboratory on March 3, 2010. They were
maintained at the laboratory at a temperature of 20C to 60C except as noted below.
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.
NWTPH Gx Analysis
Per EPA Method 5035A, samples were received by the laboratory in pre -weighed 40 mL VOA vials within
48 hours of sample collection. They were stored in a freezer at between -70C and -200C until extraction or
analysis.
Any other QA/QC issues associated with this extraction and analysis will be indicated with a footnote
reference and discussed in detail on the Data Qualifier page.
OnSite Environmental, Inc. 14648 NE 95"' 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 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
NWTPH-Gx
Matrix: Soil
Units: mg/kg (ppm)
3
Date Date
Analyte
Result
PQL Method Prepared Analyzed Flags
Client ID:
B-2 7.5'
Laboratory ID:
03-029-01
Gasoline
ND
14 NWTPH-Gx 3-5-10 3-8-10
Surrogate:
Percent Recovery
Control Limits
Fluorobenzene
85
53-126
Client ID: B-1 7.5'
Laboratory ID: 03-029-02
Gasoline ND 5.0 NWTPH-Gx 3-5-10 3-8-10
Surrogate: Percent Recovery Control Limits
Fluorobenzene 98 53-126
Client ID: B-1 10,
Laboratory ID: 03-029-03
Gasoline ND 7.1 NWTPH-Gx 3-5-10 3-8-10
Surrogate: Percent Recovery Control Limits
Fluorobenzene 100 53-126
Client ID: B-3 7.5'
Laboratory ID: 03-029-04
Gasoline ND 4.7 NWTPH-Gx 3-5-10 3-8-10
Surrogate: Percent Recovery Control Limits
Fluorobenzene 93 53-126
OnSite Environmental, Inc. 14648 NE 95"' 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 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
NWTPH-Gx
QUALITY CONTROL
Matrix: Soil
Units: mg/kg (ppm)
4
Date Date
Analyte
Result
PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID:
M130305S2
Gasoline
ND
5.0 NWTPH-Gx 3-5-10 3-5-10
Surrogate:
Percent Recovery
Control Limits
Fluorobenzene
102
53-126
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 03-029-04
ORIG DUP
Gasoline ND ND NA NA NA NA NA 30
Surrogate:
Fluorobenzene
93 91 53-126
OnSite Environmental, Inc. 14648 NE 95"' 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.
9
Date of Report: March 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
NWTPH-Dx
Matrix: Soil
Units: mg/kg (ppm)
Date Date
Analyte Result POL Prepared Analyzed Flags
Lab ID: 03-029-01
Client ID: B-2 7.5'
Diesel Range
ND
45
3-5-10
3-5-10
Y
Lube Oil
90
90
3-5-10
3-5-10
Y
Surrogate: o-terphenyl
78%
50-150
Lab ID:
03-029-02
Client ID:
B-1 7.5'
Diesel Range
ND
27
3-5-10
3-5-10
Y
Lube Oil Range
ND
53
3-5-10
3-5-10
Y
Surrogate: o-terphenyl
86%
50-150
Lab ID:
03-029-03
Client ID:
B-1 10'
Diesel Range
ND
260
3-5-10
3-5-10
Y,U1
Lube Oil
2600
300
3-5-10
3-5-10
Y
Surrogate: o-terphenyl
80%
50-150
Lab ID:
03-029-04
Client ID:
B-3 7.5'
Diesel Range
ND
27
3-5-10
3-5-10
Y
Lube Oil
450
54
3-5-10
3-5-10
Y
Surrogate: o-terphenyl
80%
50-150
OnSite Environmental, Inc. 14648 NE 95"' 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.
1.9
Date of Report: March 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
NWTPH-Dx
METHOD BLANK QUALITY CONTROL
Date Extracted: 3-5-10
Date Analyzed: 3-5-10
Matrix: Soil
Units: mg/kg (ppm)
Lab ID: MB0305S1
Diesel Range: ND
PQL: 25
Identification: ---
Lube Oil Range: ND
PQL: 50
Identification: ---
Surrogate Recovery
o-Terphenyl: 90%
Flags: Y
OnSite Environmental, Inc. 14648 NE 95"' 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.
II
Date of Report: March 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
NWTPH-Dx
DUPLICATE QUALITY CONTROL
Date Extracted: 3-5-10
Date Analyzed: 3-5-10
Matrix: Soil
Units: mg/kg (ppm)
Lab ID: 03-029-02 03-029-02 DUP
Diesel Range: ND ND
PQL: 25 25
RPD: N/A
Surrogate Recovery
o-Terphenyl: 86% 81 %
Flags: Y Y
OnSite Environmental, Inc. 14648 NE 95"' 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.
F
Date of Report: March 11, 2010
Samples Submitted: March 3, 2010
Laboratory Reference: 1003-029
Project: 218 1779 036 01 05
% MOISTURE
Date Analyzed: 3-5-10
Client ID
Lab ID
% Moisture
B-2 7.5'
03-029-01
44
B-1 7.5'
03-029-02
6
B-1 10'
03-029-03
17
B-3 7.5'
03-029-04
7
OnSite Environmental, Inc. 14648 NE 95"' 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.
A,L
OnSite
Environmental Inc.
Data Qualifiers and Abbreviations
A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data.
8 - 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-napthalene) are present in the sample.
N - Hydrocarbons in the lube oil range are impacting the diesel range result.
N1 - Hydrocarbons in the diesel range are impacting the lube oil range result.
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.
Y - Sample extract treated with an acid/silica gel cleanup procedure.
Z-
ND - Not Detected at PQL
PQL - Practical Quantitation Limit
RPD - Relative Percent Difference
OnSite Environmental, Inc. 14648 NE 95"' 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.
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APPENDIX D
Contaminated Soil and
Groundwater Management Plan
Contaminated Soils and Groundivater Report
Lake Avenue South Storm System Project (SWP-27-3519)
City of Renton
APPENDIX D
Contaminated Soil and Groundwater Management Plan
1. Contaminated Soil Management
1.1. Contaminants of Concern
1.1.1. Total Petroleum Hydrocarbons (TPH), gasoline, and diesel fractions
1.2. Analytical Tests
1.2.1. Gasoline Fraction: NWTPH-Gx
1.2.2. Diesel Fraction: NWTPH-Dx
1.2.3. Testing for other analytes as required by the soil disposal facilities (see 1.7 below)
1.3. Analytical Testing Equipment
1.3.1. Mobile lab equipment from a WA -certified laboratory located within construction
trailer. Use of mobile lab contingent upon approved staging plan
1.3.2. Washington -certified fixed -base laboratory
1.4. Sample Turnaround Time
1.4.1. Less than 30 minutes for each sample
1.5. Soils to be Tested
1.5.1. Soils from excavation of pits for jacking and receiving of casing and pipe
1.5.2. Soils from jack and bore advancement of casing pipe
1.5.3. Soils from any other open cut trenches, excavations or boring that penetrates the
surface
1.6. Arrangement for Soil Transport
1.6.1. Licensed hauler for transport to disposal site
1.6.2. Dump trucks lined to prevent leakage of pore water, if present
1.7. Arrangement for Soil Disposal
1.7.1. Licensed facilities for disposal of contaminated soils
1.7.2. Confirm concentration limits and testing requirements for soils contaminated with
TPH-G and TPH-D
1.7.3. Specify facility for clean soils and facility for contaminated soils
1.7.4. Document TPH-Gx and TPH-Dx concentration criteria for disposal at each facility
1.8. Field Observations and Measurements
1.8.1. Staff: Prior experience with identification, sampling, and documentation of TPH-
contaminated soils
1.8.2. Observe soil in each excavator bucket prior to loading into dump truck
1.8.3. Check for odors or discoloration; log presence or absence in the field notebook.
1.8.4. Head -Space Test: Place a portion of the soil in a glass jar to the half -full mark.
Immediately cover the jar tightly with aluminum foil. Pierce the foil with the probe of a
calibrated Field Photoionization Detector (PID). Record the reading in the field
notebook.
1.9. Soils Handling
1.9.1. Excavated soils placed directly in dump truck
1.9.2. Full dump truck proceeds to staging area
1.9.3. Truck and driver on standby until sample results from the mobile lab are received (see
1.12 below)
March 2011 1 218-1779-036 D-1
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
1.10. Soil Sample Collection
1.10.1. Sampling Frequency: One composite sample from each dump truck load
1.10.2. Use clean rigid plastic or metal pipe or core barrel
1.10.3. Insert pipe at three locations in dump truck bed
1.10.4. Place all three soil sample aliquots into a stainless steel bowl
1.10.5. Gently mix soil in bowl with clean spoon or spatula
1.10.6. Fill a laboratory -supplied clean 8-ounce glass sample jar with soil from the bowl
1.10.7. Replace jar lid and label sample jar with sample date, time, location, truck number, and
sample number
1.10.8. Deliver sample to on -site mobile laboratory
1.11. Soil Sample Analysis in Mobile Laboratory
1.11.1. Log sample in log book
1.11.2. Complete analysis for TPH-Gx and Dx
1.11.3. Record result in log book
1.11.4. Provide result to Contractor representative
1.12. Soil Disposal Decision Based on Sample Results
1.12.1. Select disposal site (clean or contaminated)
1.12.2. Document selection in log book
1.12.3. Inform truck driver of decision
1.12.4. Provide sample result documentation and load number to truck driver
1.12.5. Truck driver transports soil to disposal site and receives receipt
1.12.6. Truck driver provides the receipt to Contractor's representative
2. Contaminated Groundwater Management
2.1. Contaminants of Concern
2.1.1. Total Petroleum Hydrocarbons (TPH), gasoline, and diesel fractions
2.2. Analytical Tests
2.2.1. Gasoline Fraction: NWTPH-Gx
2.2.2. Diesel Fraction: NWTPH-Dx
2.2.3. Testing for other analytes required by discharge permit (see 2.5 below)
2.3. Analytical Testing Equipment
2.3.1. WA -certified laboratory, or
2.3.2. Mobile lab equipment from WA -certified laboratory located within construction trailer.
Use of mobile lab contingent upon approved staging plan.
2.4. Groundwater to be Tested
2.4.1. Discharge from construction dewatering system
2.5. Arrangement for Groundwater Disposal
2.5.1. Complete an "Industrial Waste Program Construction Dewatering Request" form using
groundwater sampling data provided with this Plan and submit the form to the City of
Renton Wastewater Utility
2.5.2. Obtain a permit from the City to discharge groundwater from the dewatering system to
the sanitary sewer manholes at the project site (as identified on the project drawings),
including payment of fees associated with the permit
2.5.3. Post a copy of the permit at the project site
D-2 March 2011 1218-1779-036
Contaminated Soils and Groundwater Report
Lake Avenue South Storm System Project (SWP-27-3529)
City of Renton
2.6. Groundwater Handling
2.6.1. Route any groundwater discharge to a holding tank with a valve -controlled outlet to the
sanitary sewer manhole identified on the project plans
2.6.2. Tank outlet shall be equipped with a flow meter capable of measuring instantaneous
flow and totalized flow in gallons per minute (gpm)
2.7. Groundwater Sample Collection
2.7.1. Staff. Prior experience with water sampling and sample documentation
2.7.2. Use clean sample bottles provided by the laboratory
2.7.3. Collect the sample volume required by the laboratory
2.7.4. Label each sample bottle with the sample date, time, location, discharge flow rate to
sanitary sewer, discharge manhole number, and sample number
2.7.5. Deliver sample to the on -site mobile laboratory
2.8. Groundwater Sample Analysis in Laboratory
2.8.1. Log sample in log book
2.8.2. Complete analysis for TPH-Gx and Dx
2.8.3. Record result in log book
2.8.4. Provide result to Contractor representative
2.9. Groundwater Discharge Permit Compliance Check
2.9.1. Compare groundwater concentrations to concentration limits specified in the
dewatering permit
2.9.2. If sample concentrations are below the specified limits, log the results in the log book
2.9.3. If any sample concentrations is greater than the respective limit, collect another sample
and submit sample to mobile laboratory for analysis
2.9.4. If any concentration in the second sample is greater than the respective limit,
immediately shut down the dewatering system and contact the Engineer
2.9.5. Log the original and second sample results in the log book, along with the time of
dewatering system shut down
2.9.6. If dewatering system is shut down for any reason other than completion of the project,
the system shall not be restarted without approval of the Engineer
2.10. Groundwater Discharge Sampling Frequency
2.10.1. Every 4 hours
2.10.2. If sample results are consistent and below the concentration limits specified in the
dewatering permit, extend the sampling interval to once every 24 hours, with approval
from the Engineer
2.10.3. If the dewatering system has been shut down due to exceedance of concentration limits,
resume 4-hour sampling frequency upon system start up, followed by extension of the
sampling interval, if supported by subsequent sample results
March 2011 1218-1779-036 D-3
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