HomeMy WebLinkAboutPermit Field Test & Inspection Report 2003-9-8
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HILL& DALE ENGINEERING, LLC
74 EAST 18TH AVENUE, #5
EUGEN E, OREGON 97401
541-868-0667
FAX: 541-868-0888
09/08/03
Larry Scoville
3466 Ambleside
Springfield, OR 97478
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RE: 3466 Ambleside - Site Inspection for retaining wall- Job #405-03
As you requested, a site visit was performed at the above address on 09/03/03, to inspect
the installed bulkhead retaining wall and fence at the back yard (north) property line,
Inspection of the retaining structure and fence showed it to be installed in a workmanship
manner, The 6"x6" pressure treated posts are full height to retain approximately 36" of
loam backfill and for fence construction, You informed me that there is drainage pipe
installed at the base of the backfill and that the posts are embedded in the native soil 48"
in a concrete filled hole approximately 12" in diameter, The bulkhead 3-4"xI2" pressure
treated girts spanning 8' to retain the 36" of backfIll as installed are satisfactory.
Attached are calculations that show this installation is satisfactory for the applied loads,
In addition, you requested that I inspect the west property line between your residence
and the neighboring residence that is currently under construction at a lower elevation
than your residence, It appears that the soil has been cut to a bank height of
approximately 5' for the new construction to the west of your property line, The concrete
porch of your residence, that also provides support for roof load, appears to be
undermined due to this bench cut, A retaining structure approximately 7'-8' in height
will be required to be installed at the property line to allow construction to repair the
undermined porch and ensure that the porch will not be undermined in the future.
installation of hollow block stack gravity wall (Diamond Block type) is not
recommended at this property line due to the close proximity of your residence to the
property line, Walls of this type require a width of backfill approximately the same as
the height, which is not available at this site, It is also not recommended to install a
shorter retaining structure that would require placement on clay fill soil, It is
recommended that a rip-rap gravity wall or a concrete or eMU retaining wall be installed
at the property line with the base placed on native grade.
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It is in the best interest of the owners of both properties, and highly recommended, that
the wall be designed in cooperation between both property owners and installed prior to
any additional exterior concrete work being placed at the west property under
construction, so that the most efficient retaining structure that will allow both property
owners the best use of their individual properties may be designed, A property line
retaining structure placed on native grade will be required regardless of cooperation as
the first step in repairing the undermined porch and root support at your residence.
Thank you for this opportunity to be of service, If you have any questions regarding this
report, contact me at 868-0667,
Sincerely,
Pamela S. Hillstrom, P,E,
".'H1LL.&.DALE ENGINEERING, LLC
74 EAST 18TH A VEN U E, SU ITE #5
EUGENE, OREGON 97401
(541) 868-0667
FAX: (541) 868-0888
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