HomeMy WebLinkAboutBuilding Correspondence 2007-7-19 • SCANNED
K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
engineering
July 19,2007 Project:42.06
•
Mr. Duane Knights
2258 33rd St.
Springfield, OR 97477
•
Subject: Foundation pad inspection
Springfield permit no. COM2006-00115
6263/6265 Aster St., Springfield, Oregon
PURPOSE AND SCOPE
As requested, we have inspected the foundation pad excavated for the subject project. K &A Engineering, Inc.
has previously provided geotechnical recommendations for development of this project site.' The purpose of
. our inspection was to determine if the foundation pad has been prepared to adequately support foundation loads
of the proposed 2-story duplex.
The scope of our services for this inspection included several visual inspections during site development and
this report.
SITE INSPECTIONS
•
Buttress Retaining Walls
We inspected the site during construction of the buttress retaining walls (designed by K&A Engineering, Inc.
and provided with our supplemental recommendations dated October 18, 2006). Two terraced retaining walls,
consisting of segmental masonry facing with geogrid-reinforced mechanically stabilized earth backfill, were
constructed to our specifications for materials and methods. The subgrade for these walls was prepared
according to our recommendations and consisted of dense basalt silty-gravelly colluvium and bedrock.
Foundation Pad
The foundation pad located below the retaining walls, adjacent to the street right-of-way, consists of two
benches cut into the native dense basalt colluvial silty-sandy-gravelly colluvium. A thin lift (approximately 3 to
4-ihchesof 3 -inch minus dense-graded crushed aggregate was placed on the undisturbed colluvial subgrade.
SUMMARY AND RECOMMENDATIONS
Based on our site inspections, it is our opinion that the site has been adequately prepared according to our
recommendations and will provide suitable support for the proposed foundation system.
"'Level II geotechnical site assessment" September 21, 2006; "Supplemental recommendations—Springfield LDAP plan
review/correction letter dated 9/12/2006," October 18, 2006; and "Supplemental recommendations—wet weather
construction," December 6, 2006.
•
.
K & A Engineering, Inc.
We recommend acceptance of the foundation'pad and buttress retaining wall system, as constructed, by
the local building official.
Please note that it is vital that the perimeter foundation drainage system be constructed according to our original
recommendations. This drainage system should be installed after construction of the perimeter footing and
stem wall.
Thank you for the opportunity to be of service. Please call us if you have questions or need further assistance.
Sincerely,
SPED PROFFS
cc - 9 r
OREG'N
koy En-e` oa~
EXPIRES
•
Michael Remboldt, P.E.
K &A Engineering, Inc.
•
•
•
•
•
Project: 42.06 6263/6265 Aster St.,.Springfield, Oregon Page 2 of 2
Client: Knights July 19, 2007
•
•