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Kirkland | Tacoma | Mount Vernon 425-827-7701| www.aesgeo.com
Date Mailed:
Principal / PM: Bruce Guenzler, L.G., L.E.G.
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.
09/1/2022 Renton Elementary School 16 20180398E003 058
Location Municipality AESI Project Manager AESI Field Rep
1075 Duvall Ave NE Renton Bruce Guenzler, L.E.G. Samantha Parker
Permit No. Client/Owner Attn Requested By
B21004604 Renton School District No. 403 Ed Thomson Contractor
Engineer/Architect General Contractor Grading Contractor Weather
CPL / Hutteball + Oremus Cornerstone/Kyle Continental Dirt Contractors/ Jerry Jr. Sunny, 80’s
THE FOLLOWING WAS NOTED:
Associated Earth Sciences Inc. (AESI) was on-site in the morning for observation of Stormwater Detention Facility 2 progress,
electrical trench backfill, and water line backfill, and storm line backfill at the request of Jerry Jr. of CDC.
Stormwater Detention Facility 2
While on-site, we observed that the contractor had completed placement of the top geotextile protection liner. The PVC liner was
still partially completed. The contractor was beginning to place 0.5’ of clean aggregate across the bottom of Facility 2, as per plan.
The contractor informed AESI that the PVC liner would become available Friday and the remaining strip would be installed prior to
aggregate placement over the section. See Figure 1 for location of observed area today.
Electrical Trench Backfill
While onsite, AESI observed shallow electrical trench backfill that had been placed. Approximately 2’ of backfill, consisting of onsite
soils, was placed in 1’ lifts and compacted with a hoepac. AESI used a ½ inch diameter steel soils T-probe to assess the backfill
conditions. There were several areas where AESI observed loose material that appeared to have been placed without compaction.
Generally, the area probed approximately 6” to 18”. In one section, noted in Figure 2, significant rutting and pumping was observed.
Jason of Sare informed AESI that the contractors would be scheduled to be onsite again next week. AESI plans to return next week
for further observation. See Figure 2 for location of area observed today.
Water Line Backfill
While onsite, AESI observed 3’ to 4’ of water line backfill. The backfill, consisting of onsite soils, had been placed in 1’ lifts and
compacted with a hoepac and single drum vibratory roller. AESI used a density gauge to test the newly backfilled section. Test
results met or exceeded 95% compaction (Table 1). In our opinion, based on our observations and test results, we found the
observed area of backfill, to be firm and unyielding and suitable for support of planned paving. See Figure 3 for location of area
observed today.
Storm Line Backfill
While onsite, AESI observed an area of 2’ to 4’ of storm line backfill between building areas C and D. The backfill, consisting of onsite
soils, was placed in 1’ lifts and compacted with a hoepac. AESI used a density gauge to test the newly backfilled section. Test results
met or exceeded 95% compaction (Table 1). In our opinion, based on our observations and test results, we found the observed area of backfill, to be firm and unyielding and suitable for support of planned hardscape and landscaping. See Figure 4 for location of area
observed today.
Table 1: Compaction Test Results
Test
No. Location
Approximate
Backfill Depth
Relative to Existing
Ground Surface (ft)
Proctor
(ASTM D1557)
Dry Density
(pcf)
Moisture
%
Compaction
% Pass/Fail Notes
1 See Figure 3 0 129.9/9.2 123.4 7.2 96 Pass
2 See Figure 3 0 129.9/9.2 124.2 6.7 96 Pass
3 See Figure 3 0 129.9/9.2 122.8 7.1 95 Pass
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4 See Figure 3 0 129.9/9.2 122.7 7.3 95 Pass
5 See Figure 3 0 129.9/9.2 124.0 6.5 96 Pass
6 See Figure 4 0 126.9/10.5 121.2 7.8 96 Pass
7 See Figure 4 0 126.9/10.5 120.6 6.7 95 Pass
8 See Figure 4 0 129.9/9.2 127.8 5.5 98 Pass
9 See Figure 4 0 129.9/9.2 124.2 6.6 96 Pass
Figure 1. Sheet C2.0 The observed area of Stormwater Detention Facility #2. North is to the right of the figure.
Facility #2 – Missing area of PVC liner.
Facility #2 – Location of
observed bottom
geotextile, partial PVC
liner and top geotextile
liner. Installation of
aggregate underway.
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FIELD REPORT
Figure 2. Sheet C2.1 The location of electrical trench backfill is indicated in red. The area where pumping and yeilding was observed is
indicated in orange.
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FIELD REPORT
Figure 3. Sheet C3.1 Location of water line backfill observed today is indicated in green.
Figure 4. Sheet C2.2 The location of storm line backfill observed today is indicated in blue.
1 2 3 4
5
6
8
7
9
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FIELD REPORT
Photo 1. Facility #2 progress observed today.
Photo 2. Electrical trench backfill where yielding area was observed today.