HomeMy WebLinkAboutRS_ER_Proposed_Approach_to_Address_Contamination_190916_v1
17425 NE Union Hill Road, Suite 250
Redmond, Washington 98052
425.861.6000
6860774.1
June 4, 2019
Bryant Motors
1300 Bronson Way North
Renton, Washington 98057
Attention: Russ Bryant
Subject: Proposed Approach to Address Contamination_06.04.19
Bryant Motors
1300 Bronson Way North
Renton, Washington
File No. 21948-001-02
INTRODUCTION AND BACKGROUND
The Bryant Motors Property (Property) is located at 1300 Bronson Way North in Renton, Washington and
historically was the site of a gasoline station with gasoline underground storage tanks (USTs). The USTs
were removed in the 1980s and a cleanup to remove gasoline-contaminated soil was completed as part of
the UST removal. A report to document the UST removal is not available.
Residual contamination in soil and groundwater was identified during subsurface explorations completed
in 2018 and 2019. Gasoline-range hydrocarbons were identified in soil samples from the southwestern
portion of the property at concentrations greater than the Model Toxics Control Act (MTCA) Method A
cleanup level of 100 milligrams per kilogram (mg/kg). Based on chemical analytical data and field
screening results, contamination in soil is located approximately 20- and 25-feet below ground surface
(bgs) in the southwestern corner of the property (see Figure 1). Gasoline-range hydrocarbons were identified
in a groundwater sample from a permanent monitoring well, BMW-1, at 1,100 micrograms per liter (g/L),
which slightly exceeds the MTCA Method A cleanup level of 1,000 g/ (see Figure 2).
OBJECTIVE AND PROPOSED APPROACH
The objective of the proposed approach is to achieve cleanup of residual gasoline-range hydrocarbons in
soil and groundwater at the Property under the Model Toxics Control Act (MTCA) with regulatory agency
review by the Pollution Liability Insurance Agency (PLIA). The goal is to receive an opinion of No Further
Action for the Property following the completion of remedial activities. The cleanup action consists of a
phased approach, beginning with a relatively low-cost/low effort cleanup method and progressing to a
higher cost/higher effort cleanup method if the Property cleanup goal is not achieved. The scope of services
associated with this proposed cleanup action includes the following:
Bryant Motors, Inc. | June 4, 2019 Page 2
6860774.1 File No. 21948-001-02
■ Initial phase of remedial actions at the Property.
▪ Withdraw approximately 2,500 gallons of groundwater from on-site monitoring well, BMW-1,
using a vacuum truck to remove potentially contaminated water in contact with
gasoline-contaminated soil. Dispose of extracted groundwater at a permitted, off-site disposal
facility.
▪ Install Regenesis Advanced Oxygen Releasing Compound (ORC) Filter Sock(s) into BMW-1 for
a treatment period of approximately 12 weeks.
▪ Obtain groundwater sample from monitoring well BMW-1 for chemical analysis of gasoline-
range hydrocarbons by Ecology Method NWTPH-Gx to evaluate progress of ORC in reducing
subsurface contamination. This will occur at least two weeks after the removal of the ORC filter
socks to allow subsurface conditions to stabilize.
▪ Compare groundwater sample results with MTCA Method A cleanup levels.
o If gasoline-range hydrocarbon concentrations in groundwater sample from BMW-1 are
greater than MTCA Method A cleanup levels,
• Consider withdrawl of another volume of groundwater from on-site monitoring well
BMW-1.
• Re-install ORC filter socks in BMW-1 for a period of approximately 12 weeks.
• Conduct groundwater sampling at BMW-1 at least two weeks after the removal of
the ORC filter socks to allow subsurface conditions to stabilize.
• The groundwater sample will be submitted for chemical analysis of gasoline-range
hydrocarbons by Ecology Method NWTPH-Gx
• Compare sample results with MTCA Method A cleanup levels.
o If gasoline-range hydrocarbon concentrations in groundwater samples from BMW-1 are
less than MTCA Method A cleanup levels,
• Conduct three additional quarterly groundwater monitoring events at BMW-1, and
possibly any other monitoring well required for sampling by the applicable regulatory
agency, for chemical analysis of gasoline-range hydrocarbons by Ecology Method
NWTPH-Gx.
• Present groundwater monitoring results in a summary report to PLIA with a request
for a no further action determination.
■ If attempts to obtain four quarters of sample results for gasoline-range hydrocarbons at
concentrations less than MTCA Method A cleanup levels at BMW-1 are unsuccessful, implement
the next phase of remedial actions relative to residual gasoline-range hydrocarbon contamination
in soil and groundwater at the Property.
▪ Inject PetroFix™ remediation fluid on a grid pattern throughout the treatment area
(approximately 35 feet long by 25 feet wide) on a grid pattern. Design of grid pattern and
volume of treatment fluid will be provided by Regenesis and executed by Cascade Drilling.
Bryant Motors, Inc. | June 4, 2019 Page 3
6860774.1 File No. 21948-001-02
▪ Following a remediation interval of approximately one month following the injection of PetroFix,
conduct first of four quarterly groundwater monitoring events at BMW-1 and possibly any other
monitoring well required for sampling by the applicable regulatory agency.
▪ Submit groundwater samples for chemical analysis of gasoline-range hydrocarbons by Ecology
Method NWTPH-Gx.
▪ If gasoline-range hydrocarbon concentrations in groundwater samples from BMW-1 and any
other sampled monitoring well are less than MTCA Method A cleanup levels in first monitoring
event, complete an additional three quarterly monitoring events for chemical analysis of
gasoline-range hydrocarbons. Present groundwater monitoring results in a summary report to
the Regulatory Agency with a request for a no further action determination.
▪ If attempts to obtain four consecutive quarters of sample results for gasoline-range
hydrocarbons at concentrations less than MTCA Method A cleanup levels are unsuccessful,
discuss other potential remedial alternatives with Client.
LIMITATIONS
Our services are for the exclusive use of Bryant Motors. There are no intended third-party beneficiaries
arising from the services described in this document and no party other than Bryant Motors shall have the
right to legally rely on the product of our services without prior written permission of GeoEngineers.
Any Third Party requesting the right to place legal reliance on the instruments of service produced by
GeoEngineers under this agreement shall be required by GeoEngineers to sign a Third-Party Reliance Letter.
The provisions of the letter shall include a requirement for third party to agree to the same limitations in
scope and any limitations in liability negotiated between GeoEngineers and client.
We appreciate the opportunity to assist you with this project. Please call if you have questions concerning
this proposed scope of services.
Sincerely
GeoEngineers, Inc.
Paul Craig, LG Tony Orme, PE
Senior Project Manager Associate
PRC:TNO:lw
Attachments
Figure 1. Site Plan with Soil Sample Results
Figure 2. Site Plan with Groundwater Sample Results
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
B8
B20
B21
B19
MW-14
BMW-1
BMW-2
Figure 1
1300 Bronson Way North
Renton, Washington
Site Plan with Soil Sample Results
W E
N
S
Legend
\\geoengineers.com\WAN\Projects\21\21948001\CAD\01\Environmental\2194800101_F02_Site Plan with Soil Sample Results.dwg TAB:F02 Date Exported: 05/08/19 - 16:12 by mwoodsNotes:
1. The locations of all features shown are approximate.
2. This drawing is for information purposes. It is intended to
assist in showing features discussed in an attached document.
GeoEngineers, Inc. cannot guarantee the accuracy and content
of electronic files. The master file is stored by GeoEngineers,
Inc. and will serve as the official record of this communication.
Data Source: Aerial from Pictometry dated 2017.
Projection: NAD83 Washington State Planes, North Zone, US Foot
Feet
020 20
Direct-Push Boring by TerraconB8
Monitoring Well Installed by GeoEngineers in March 2019BMW-1
MW-14 Monitoring Well by City of Renton
Brons
o
n
W
a
y
NGarden Ave NBryant Motors
1300 Bronson Way N
BMW-2 (mg/kg)
Sample Name G D LO B T E X
BMW-2-22.5 <5.7 <29 <57 <0.020 <0.057 <0.057 <0.057
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
milligrams per kilogrammg/kg =
gasoline-range hydrocarbonsG =
diesel-range hydrocarbonsD =
lube oil-range hydrocarbonsLO =
benzeneB =
tolueneT =
ethylbenzeneE =
xylenesX =
Model Toxics Control ActMTCA =
Cleanup LevelCUL =
1,200 Cell shading indicates a concentration that
exceeds the MTCA Method A cleanup level
1,200 Bold cell value indicates analyte was
detected above laboratory Reporting level
B20 (mg/kg)
Sample Name G D LO B T E X
B20-15.5 <3.0 <25 <50 ND ND ND ND
B20-21.5 40 <25 <50 ND ND ND ND
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
B19 (mg/kg)
Sample Name G D LO B T E X
B19-15.5 76 93 <50 ND ND ND ND
B19-17.5 <3.0 <25 <50 ND ND ND ND
B19-22 6 <25 <50 ND ND ND ND
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
BMW-1 (mg/kg)
Sample Name G D LO B T E X
BMW-1-18.5 <6.6 <130 <61 <0.020 <0.066 <0.066 <0.066
BMW-1-23.5 370 <29 <59 <0.020 <0.081 1.5 0.59
BMW-1-31.5 42 <29 <57 <0.020 <0.062 0.16 0.081
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
B8 (mg/kg)
Sample Name G D LO B T E X
B8-21 <3.0 <25 - - ND ND ND ND
B8-22.5 1,200 57 <50 ND ND ND ND
B8-23 37 <25 - - ND ND ND ND
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
B21 (mg/kg)
Sample Name G D LO B T E X
B21-16 10 <25 <50 ND ND ND ND
B21-21.5 220 <25 <50 ND ND ND ND
MTCA Method
A CUL 100 2,000 2,000 0.03 7 6 9
Not Analyzed"- -" =
Not DetectedND =
B8
B20
B21
B19
MW-14
20.51
BMW-1
20.54
BMW-2
20.54
Figure 2
1300 Bronson Way North
Renton, Washington
Site Plan with Groundwater Sample Results
W E
N
S
Legend
\\geoengineers.com\WAN\Projects\21\21948001\CAD\01\Environmental\2194800101_F03_Site Plan with Groundwater Sample Results.dwg TAB:F03 Date Exported: 05/08/19 - 16:15 by mwoodsNotes:
1. The locations of all features shown are approximate.
2. This drawing is for information purposes. It is intended to
assist in showing features discussed in an attached document.
GeoEngineers, Inc. cannot guarantee the accuracy and content
of electronic files. The master file is stored by GeoEngineers,
Inc. and will serve as the official record of this communication.
Data Source: Aerial from Pictometry dated 2017.
Projection: NAD83 Washington State Planes, North Zone, US Foot
Feet
020 20
Boring by TerraconB8
Brons
o
n
W
a
y
NGarden Ave NBryant Motors
1300 Bronson Way N
micrograms per Literμg/L =
gasoline-range hydrocarbonsG =
diesel-range hydrocarbonsD =
lube oil-range hydrocarbonsLO =
benzeneB =
tolueneT =
ethylbenzeneE =
xylenesX =
Model Toxics Control ActMTCA =
Cleanup LevelCUL =
1,200 Cell shading indicates a concentration that
exceeds the MTCA Method A cleanup level
1,200 Bold cell value indicates analyte was
detected above laboratory reporting levelB21 (μg/L)
Sample Name G D LO B T E X
B21 1,700 560 <250 ND ND 2.3 ND
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
Not DetectedND =
B8-W (μg/L)
Sample Name G D LO B T E X
B8-W <50 <130 <250 <2.0 <2.0 <2.0 <4.0
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
BMW-2 (μg/L)
Sample Name G D LO B T E X
BMW-2 <100 <0.25 <0.40 <1 <1 <1 <1
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
BMW-1 (μg/L)
Sample Name G D LO B T E X
BMW-1 1,100 <0.64 <0.40 <1 <1 <1 <1
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
B20 (μg/L)
Sample Name G D LO B T E X
B-20 <50 <130 <250 ND ND <2.0 ND
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
MW-14 (μg/L)
Sample Name G D LO B T E X
MW-14 <100 <0.25 <0.40 <1 <1 <1 <1
MTCA Method
A CUL 1,000 500 500 5 1,000 700 1,000
BMW-1
20.54
DW-14
20.51
Monitoring Well by City of Renton
and Groundwater Elevation
Monitoring Well Installed by GeoEngineers in
March 2019 and Groundwater Elevation
General Groundwater Flow Direction based on
historic data provided by The City of Renton