HomeMy WebLinkAbout20160674E002 Bethany Corner 2022-04-29 FR 037.pdf
Kirkland | Tacoma | Mount Vernon
425-827-7701| www.aesgeo.com
Date Mailed:
Principal / PM: Matthew A. Miller, P.E.
This document is considered a DRAFT until signed or initialed by an AESI Principal or Project Manager
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FIELD REPORT
Date Project Name Project No. Report No.
2022-04-29 Bethany Corner 20160674E002 037
Location Municipality AESI Project Manager AESI Field Rep
10969 SE 165th St. Renton Matthew A. Miller, P.E. Scott R. Hannah, L.G.
Permit No. Client/Owner Attn Requested By
B21005554-V2 Mark Seek (Tiger Mountain Homes) Mark Seek Contractor
Engineer/Architect General Contractor Earthwork Contractor Weather
HiLine Homes Tiger Mountain Homes / Mark Tiger Mountain Cloudy, 40’s
THE FOLLOWING WAS NOTED:
Lot 8 Building Foundation Excavation and Backfill, Permit #B21005554-V2:
Yesterday afternoon, the contractor informed us that they completed the excavation for the Lot 8 building foundation.
Based on our conversation, the over-excavated building area removed old fill soil, an underlying black, organic-rich
material, and wet, loose native soil like other building excavations in the development. Due to caving issues at the end of
yesterday, the contractor planned to temporarily backfill against the eastern cut slope with soil, as recommended. They
also requested that we make a site visit this morning.
Upon our arrival today at 7:45am, we observed that the excavation was up to 11 feet deep below surrounding grade. An
access ramp for the excavator was in the southwest corner of the excavation. We also observed soil stockpiled against the
eastern, temporary cut slope to help reduce caving beyond the excavation towards Lot 9. Native, suitably firm sediment
was observed in the bottom of the excavation where it was not covered by the eastern, temporary fill slope or by mud
created by the excavator. While onsite, we observed three, 10-yard dump trucks unload 2 to 4-inch size recycled
concrete (spalls) directly into the northern end of the excavation. The spalls were placed on native sediment consisting of
tan-brown, silty sand with some gravel. Mark with Tiger Mountain Homes informed us that they planned to have 21 more
loads of spalls delivered to the site today to backfill the excavation.
Mark planned to push the mud out of the flat, bottom part of the excavation and replace it with the spalls. We
recommended that the spalls be tamped down every 2 feet thick with the bucket of the excavator to create a tight mass
of unyielding material. We also recommended that they remove and replace short sections (10 feet wide or less) of the
soil placed against the eastern cut slope to help reduce further caving and potential exposure of the Lot 9 foundation. We
left the site at approximately 8:45am with plans to return later in the day.
A representative from AESI returned this afternoon from 12:30 to 3:30 pm and observed placement and compaction of
the spalls. The surface of the spalls were approximately 1.5 feet below footing base at the time of our arrival. We did not
observe the contractor replace the temporary soil slope against the eastern cut with spalls. The operator informed us
that they removed the temporary soil slope in 5-foot wide sections, replacing each section with compacted spalls before
removing the next section. We understand that the contractor might lower the designed bottom of footing elevation by a
couple feet and then backfill on both side of the foundation wall later.
Plans and photos are shown on the following pages.
Date Project Name Project No. Report No.
4/29/2022 Bethany Corner 20160674E002 037
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FIELD REPORT
Lot 8 Excavation
Date Project Name Project No. Report No.
4/29/2022 Bethany Corner 20160674E002 037
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FIELD REPORT
Lot 8 excavation looking SE
Date Project Name Project No. Report No.
4/29/2022 Bethany Corner 20160674E002 037
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Lot 8 excavation looking N
Date Project Name Project No. Report No.
4/29/2022 Bethany Corner 20160674E002 037
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FIELD REPORT
Lot 8 spall backfill looking S.