Riley Group-Final Inspection Report (5-30-14).pdfMay 30, 2014
Ms. Tov6 Skaftun
Community Health Center of Snohomish County
8609 Evergreen Way
Everett, Washington 98206
c/o Mr, Vlad Oustimovitch
VOKA Incorporated
RE: Final Geotechnical Inspection Report
Edmonds Community Health Center of Snohomish County
23320 Highway 99
Edmonds, Washington 98026
RGI Report No. 2012-599
Dear Ms, Skaftun:
The Riley Group, Inc. (RGI) was retained by Community Health Center of Snohomish County
to provide intermittent earthwork observation and geotechnical special inspection services
during the construction of the above -referenced project from July 29, 2013 to May 16, 2014,
Our services were completed in accordance with the inspection requirements outlined in
the City of Edmonds' requirements in the pre -construction meeting. Our observations
included soil bearing capacity, fill compaction, excavation stability, erosion, control, rockery
and retaining wall installation, and other geotechnical related issues.
RGI reviewed the site and design plans approved by City of Edmonds for construction. Based
on our observation, the earthwork construction has been completed in substantial
conformance with City of Edmonds' approved plans and the geotechnical special inspection
requirements. The following briefly summarizes the services that we have performed'.
1. Soil Bearing Capacity
The building is supported on a continuous exterior and interior spread column foundations
bearing on very dense native soil. Based on our observations of the native foundation
subgrade soils, the native soil is suitable for the design bearing capacity of 5,000 pounds per
square foot (psf).
2. Excavation Observations
A RGI representative observed the major site excavations, footings, and utility trenches
during construction. our observations indicated' that the excavations were performed in
dense native soil. The temporary cut slopes were observed to be in stable condition. No
significant soil movement was observed on the site or adjacent properties. The backfill has
been placed to re-establish the lateral support for the adjacent properties.
Tacoma, Washington Corporate Office Kennewick, Washington
Phone 253.565.0552 17522 Bothell Way Northeast Phone 509.586.4840
Bothell, Washington 98011
Phone 425.415.0551 R' Fax 425.415.0311
www.riley-groupxom
CHC Edmonds Page 2 May 30, 2014
Edmonds, Washington RGI Project No. 2012-599
3, Structural Fill and Compaction
RGI observed and verified the structural fill placed on site during constructioln. Both native
soil and imported structural fills were used for the project. The structural fills were placed in
lifts and properly compacted. Based on our observations, the structural fills placed on the
site were adequately compacted.
4. Subsurface Drainage
RGI observed the installation of subsurface drainage. The drainage was installed per the
approved plans.
S. Erosion Control - Temporary
During our site visits, RGI representatives did not observe erosion on the site or sediment
tracking onto the streets, the public storm water system or adjoining properties during
construction.
6. Rockeries and Retaining Walls
RGI observed the installation of rockeries along the property lines. The excavation was in
stable condition and rockeries were installed properly.
RGI also observed the construction of retaining walls onsite. All retaining walls were
supported on dense native soil subgrade. The retaining walls were backfifled and compacted
properly to have met the design requirements,.
7. Other Geotechnical
RGI attended the pre -construction meeting with the City of Edmonds on the 'project site. All
inspections were performed based on the requirements discussed in the pre -construction
meeting.
Please call us if you have any questions or need additional information at (425) 415-0551.
Sincerely yours,
THE RILEY GROUP, INC.
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Ricky R. Wang, Ph.D., P.E.
Principal Engineer
Attachment: Field Reports I to 46
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