REVIEWED PLN BLD2022-0462+Geotechnical_Report+5.6.2022_2.46.01_PM+2853667Aug 21 01 02:11p GEOTECH CONSULTANTS INC I4251747-6561
P. 1
UE U TE C H 13256 NE 201h Street, Suite 16
Bellevue, WA 98005
CONSULTANTS, INC. (425) 747-5618 FAX 747-8561
------ -
Reviewed by
Fax City of Edmonds ' RECEIVED
JN: 01248� � ' 5/6/2022
Planning Division
To: Stan Piha
Fern Scott Stevens i _ _ - - - _ -
CITY OF EDMONDS
Company. Prha/Rogel Date: August 21, 2001 DEVELOPMENT
- SERVICES DEPARTMENT
FAX: (206) 441-1080 Pages: 5
Phone: (206) 443-8213 RE: Edmonds Terrace Development, Soil Sample
ourgeut OFor Review QPlease Comment ❑Please Reply oplease Recycle
Stan,
This memo is to outline environmental observations on the proposed site of the Edmonds
Terrace Multi -Family Project, located at 236XX 84th Avenue West in Edmonds, Washington.
As part of the work for our Geotechnical Engineering study, we completed eight test pits at
various locations on the proposed building site. During the excavation of the test pits we
observed discoloration of the native soil and a petroleum odor from Test Pit 6.
Test Pit 6 was located in the proposed access easement near 238th Street Southwest. The
test pit encountered dense to very dense glacial fill approximately 4 feet below the existing
grade_ Discoloration and petroleum odors were also noted within the test pit from approximately
5 to 8 feet below grade.
We retained a sample of the suspect soil and had it tested for total petroleum hydrocarbons in
the diesel and oil range (TPHd+o) according to NWTPH-Dx. The results of this analytical
testing is tabulated below.
LABORATORY RESULTS - SOIL
NWTPH-Dx
Test Pit
Depth Contaminant Quantitative Amount
Action Level
TP-6
5-8 feet Kerosene/Jet Fuel 360 mg/kg'
2000 mg/kg2
TP-6
5-8 feet Diesel/Fuel Oil Nd3
2000 mg/kgz
TP-6
5-8 feet Heavy Oil Nd3
2000 mg/kg2
Notes:
1.
mg/kg equates parts per million (ppm)
2.
Method A of the Model Toxics Control Act (MTCA), Chapter 173-340-740 of the
Washington Administrative Code (WAC).
3.
Nd - Non -Detect
08-21-01 13:14 RECEIVED FROM:425 747 8561 P.01
Aug 21 01 02:11P
GEOTECH COPISULTHNTS INC (425)747-6561
P.2
R&P Investment Co., LLC, C/o CCA A-chitects JN 01248
August 21, 2001 Page 2
The state cleanup guidelines are published in the Model Toxics Control Act, Chapter 173-340 of
the Washington Administrative Code (WAC). According to the analytical results of the soil
sampling performed on the property, results for Total Petroleum Hydrocarbons in the form of
Kerosene/Jet Fuel are above the minimum detection level of the laboratory and below the state
listed cleanup levels.
It has been our recent experience at several sites that sail with odors or other indications of
contamination, while clean according to WDOE guidelines, is not generally accepted for export.
It has to be disposed of or treated as contaminated, or reused onsite in accordance with WDOE
Guidelines for use of petroleum contaminated soil.
In our opinion the earthwork and excavation costs of this project in this area will likely increase
due to the presence of impacted sal. The extent of soil disturbance in the proposed easement
area is still in the planning phase. Disposal costs of contaminated soil are higher than
uncontaminated soil and the amount of soil for potential use at another site as fill will be limited
Again, the amount of soil affected by this potential contamination is unknown, and will likely not
be fully known until the time of excavation.
We understand that another environmental consulting firm is preparing a Phase 1
Environmental Site Assessment {ESA} at this time. We would recommend thoroughly
reviewing their results to determine a potential source of contamination to the subject property.
We could assist in the delineation of the horizontal extent of the contamination and /or the
determination of a potential cause if it is in the interest of the development.
If you have any questions, or if we may be of further service, please do not hesitate to contact
us.
'`"Scott Stevens
Geotechnical Engineer
Cc: CDA Architects, Incorporated
Attn: Seth Hale / Bryan Berchers
Fax: 206-368-9558
Poggemeyer Design Group
Attn: Chuck Shields
Fax: 425-828-4850
08-21-01 13:14
RECEIVED FROM:425 747 8561
P.02
Aug 21 01 02:11p GEOTECH
CONSULTANTS INC (4251747-8561 p.3
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08-21-01 13:15
RECEIVED FROM:425 747 8561
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08-21-01 13:16 RECEIVED FROM:425 747 8561 P-05