REVIEWED RESUB BLD2021-0088+Geotechnical_Addendum_Letter_2+5.21.2021_8.15.38_PM+2211575Irerracon
December 6, 2019
CA Senior Living Holdings, LLC
130 E. Randolph St., Ste 2100
Chicago, IL 60601
Attn: Mr. Michael Duggan — Vice President of Development
P: (312) 248-2091
E: mduggan@ca-ventures.com
Re: Geotechnical Engineering Report — Addendum Letter No. 2
Edmonds Senior Living
21200 72nd Ave. W
Edmonds, Washington
Terracon Project No. 81185173
Dear Mr. Duggan:
This letter serves as an addendum to the Geotechnical Engineering report dated December 20,
2018 and was developed in general accordance with the Supplement to Agreement for Services
(Change Order No. 2) dated November 15, 2019 and your email authorization dated November
21, 2019. Presented in this letter are the following:
a summary of the subsurface conditions observed from advancement of additional soil
borings near the southwest and northwest portions of the site
supplemental geotechnical engineering recommendations as it relates to the subsurface
conditions observed.
Updated surface elevations for boring logs B-1 through B-4 based on interpolation of the
topographic site plan which became available after the geotechnical engineering report
was published
The conclusions and recommendations presented herein are based on the shoring and
foundation plan sets dated August 29, 2019 and October 3, 2019, respectively.
SUBSURFACE CONDITIONS
A total of four (4) soil borings were performed to provide additional subsurface information for aid
in final design of the shoring and foundation plans. The soil borings were advanced via hollow -
stem auger using a track -mounted drill rig and smaller, hand -portable drilling equipment. During
soil boring advancement, soils samples were obtained in regular 2 1/2 to 5-foot intervals via
standard penetration testing (SPT) until dense to very dense native soils were contacted.
The subsurface conditions observed were generally consistent with those presented in the
geotechnical engineering report though the fill unit (Stratum 1) was thinner and less apparent
where explored. The dense to very dense native soils (i.e. Stratum 3), capable of an allowable
Terracon Consultants, Inc. 21905 64th Ave. W, Suite 100 Mountlake Terrace, WA 98043
P (425) 771 3304 F (425) 771 3549 www.terracon.com
Geotechnical Engineering Report — Addendum Letter No. 2 Irerracon
Edmonds Senior Living Edmonds, Washington
December 6, 2019 Terracon Project No. 81185173
bearing pressure of a least 5,000 psf, were observed between 5'/z and 11 feet near the southwest
region and 3 to 5 feet near the northwest region below existing ground surface. Approximate
elevations of the stratum contacts are presented on the boring logs. The location of the contact
will vary between explorations and will not be known until earthwork construction. A site plan
presenting the locations of the soil borings and the boring logs are presented as an attachment
at the end of this letter.
FOUNDATION DESIGN AND CONSTRUCTION CONSIDERATIONS
Based on our understanding of the foundation plan, the dense native soils are likely to be present
at or near the planned footing elevations for the majority of the perimeter footings along the
shoring walls. Based on a projection of the contact elevations of dense native soils from the boring
locations to the shoring walls for the above stated plan sets, it appears some overexcavation will
be necessary:
East Wall: Approx. 4 to 5 feet between E5 and E12
South Wall: Approx. 1 to 2 feet between S3 and S23
These depths should be used for planning purposes only. The actual depth of excavation will
depend on conditions exposed in the field at the time of construction. We anticipate that
overexcavation along the West and North shoring walls will not be necessary for perimeter
footings to bear on dense native soils. Footings located at the interior of the building will need to
be overexcavated to dense native soils, if necessary. We assume the contractor will perform the
overexcavation using shallow, sloped excavation cuts of limited length that will be backfilled
immediately to reduce potential impacts to the shoring walls.
We recommend that a geotechnical engineer observe the footing subgrades at the time of
construction to help identify the dense, native soil unit targeted for footing subgrade.
Recommendations for backfilling overexcavated footing subgrades are presented in the
geotechnical engineering report. The backfilling recommendations presented in Addendum Letter
No. 1 are not applicable for foundations designed for an allowable bearing of 5,000 psf. Backfilling
must use lean mix concrete or controlled density fill (CDF) to maintain an allowable bearing
capacity of at least 5,000 psf beneath the footings.
The recommendations provided herein are to be used with the recommendations provided in the
geotechnical engineering report. Recommendations for subgrade preparation can be found in the
section of the geotechnical engineering report.
Responsive ■ Resourceful ■ Reliable 2
Geotechnical Engineering Report — Addendum Letter No. 2 Irerracon
Edmonds Senior Living Edmonds, Washington
December 6, 2019 Terracon Project No. 81185173
We appreciate the opportunity to be of service to you on this project. If you have any questions
concerning :r service, pleas- r-nf.-f 1 is
Sincerely,
Terracon
Zachary L. P.Ut-71 III, F .
Project Engineer
Attachments:
Site Exploration Plan
Soil borings logs B-1 to B-8
Senior Engineering Consultant
Responsive ■ Resourceful ■ Reliable 3
Geotechnical Engineering Report — Addendum Letter No. 2
Edmonds Senior Living Edmonds, WA
December 6, 2019 Terracon Project No. 81185173
Irerracon
•1�2. I t S
I Boring
(Nov-
2019)
DIAGRAM IS FOR GENERAL LOCATION ONLY, AND IS AERIAL PHOTOGRAPHY PROVIDED
NOT INTENDED FOR CONSTRUCTION PURPOSES BY MICROSOFT BING MAPS
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BORING LOG NO. B-1 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
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LOCATION See Exploration Plan
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Latitude: 47.8067' Longitude:-122.3303'
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Approximate Surface Elev.: 379.5 (Ft.) +/-
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DEPTH ELEVATION Ft.
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0.6 ASPHALT, approx. 1.5 inches of asphalt over 2 inches base coarse 379+/-
SANDY SILT (ML), trace gravel, fine to coarse grained, olive brown to dark
brown, moist to wet, soft, trace organics (FILL)
5
12
6-1-5
S-1
N=6
7.5 372+/-
SILTY SAND (SM), reddish brown to brown, moist, medium dense,
(RECESSIONAL OUTWASH)
rust staining in top of S-2, possibly evidence of seasonal groundwater
18
8N=316
N=31
S-2
10.5 369+/
1*113.0
SANDY SILT ML , olive gray to gray, moist, very stiff, GLACIAL TILL
( 1 9 Y 9 Y rY ( )
366.5+/-
SILTY SAND (SM), trace gravel, gray, moist, very dense
15
16-16-24
trace gravel, dense, interbedded silt
18
N=40
S-3
2
18
6" 0/ -30-5
11 -30-5
S-4
14
28
rock fragment in S-4, possibly over -stated blow -count
21.5 358+/
Boring Terminated at 21.5 Feet
Stratification lines are approximate. In -situ, the transition may be gradual. Hammer Type: Automatic (ETR = 88 % )
Samples obtained using a 2" O.D. split spoon sampler Boring log updated from Dec. 2018
Advancement Method:
See Exploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
and additional data (If any).
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with bentonite
Surface capped with concrete
Elevations were interpolated from a topographic site
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WATER LEVEL OBSERVATIONS
Boring
1 rerraco,
Started: 12-05-2018
Boring Completed: 12-05-2018
Groundwater not encountered
Drill Rig: D-50track
Driller: Holocene
i
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-2 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
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LOCATION See Exploration Plan
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Latitude: 47.8067' Longitude:-122.331'
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Approximate Surface Elev.: 379 (Ft.) +/-
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DEPTH ELEVATION Ft.
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0.6 ASPHALT, approx. 1.5 inches of asphalt over 2 inches of base coarse 378.5+/-
DRILL OUT
5
1
15
20.0 359+/-
2
POORLY GRADED SAND WITH SILT (SP-SM), light brown to brown,
4-13-25
moist, dense, (GLACIAL TILL)
12
N-38
S 4
22.5 356.5+/-
SILTY SAND (SM), reddish brown to olive gray, moist, very dense, silty
sand with interbedded silt
25
25-30-36
rust staining in S-5, possibly evidence of seasonal groudwater
18
N=66
S-5
..26.5
352.5+/-
Boring Terminated at 26.5 Feet
Stratification lines are appro)amate. In -situ, the transition may be gradual. Hammer Type: Automatic (ETR = 88 % )
Samples obtained using a 2" O.D. split spoon sampler Boring log updated from Dec. 2018
Advancement Method:
See Exploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
Boring passed through an abandoned borehole of an unknown
and additional data (If any).
nature. Drill out upper 20 feet due to evidence of borehole backfill.
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with Auger Cuttings and/or Bentonite
Surface capped with concrete
Elevations were interpolated from a topographic site
nl
WATER LEVEL OBSERVATIONS
Boring
1 rerraco,
Started: 12-05-2018
Boring Completed: 12-05-2018
Groundwater not encountered
Drill Rig: D-50track
Driller: Holocene
i
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-3
Page 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
(3
LOCATION See -)loration Plan
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Latitude: 47.8066° Longitude:-122.3307°
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Appropmate Surface Elev.: 377 (Ft.) +/_
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TOPSOIL 7 +-
SAND WITH SILT (SP-SM), trace gravel, brown to grayish brown, moist,
medium dense, some woody debris and cobbles (FILL)
3.5 373.5+/-
SAND WITH SILT fSP-SMI, light brown to brown, moist, medium dense,
(RECESSIONAL GLACIAL OUTWASH)
5
6
5-6-13
S-1
N=19
increasing silt content, transitions to silty sand
10.0 367+/-
1
SILTY SAND (SM), light brown to brown, moist, dense, (GLACIAL TILL)
15-18-13
16
N=31
S 2
15
15
10-15-15
S-3
16
13
N=30
rust staining in S-4, possibly evidence of seasonal groundwater
2
18
10-11-21
N=32
S-4
•
20.5 356.5+/-
2 1. 0 SANDY SILT (MIL), reddish brown to olive brown, moist, hard 356+/-
SAND (SE!), trace silt, brown to reddish brown, moist, dense
'..'
rust staining in S-5, possibly evidence of seasonal groundwater
2
18
37 33- 25-
N33-
S-5
•
2s.s 351.s+/-
SILTY SAND (SM), gray to dark gray, moist, very dense
26.5 350.5+/-
Boring Terminated at 26.5 Feet
Stratification lines are appropmate. In -situ, the transition may be gradual. Hammer Type: Automatic (ETR = 88%)
Samples obtained using a 2" O.D. split spoon sampler Boring log updated from Dec. 2018
Advancement Method:
See E)ploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
Boring located in landscaped area.
and additional data (If any).
See Supporting Information for eplanation of
symbols and abbreviations.
Abandonment Method:
Boring backfilled with bentonite upon completion.
Elevations were interpolated from a topographic site
WATER LEVEL OBSERVATIONS
Boring
Irerracon
Started: 12-05-2018
Boring Completed: 12-05-2018
Groundwater not encountered
Drill Rig: D-50track
Driller: Holocene
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-4 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
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LOCATION See :nloration Plan
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Latitude: 47.8064' Longitude:-122.3304'
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Approximate Surface Elev.: 376 (Ft.) +/-
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DEPTH ELEVATION Ft.
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ASPHALT, approx. 1.5 inches asphalt over 2 inches base coarse +
SILTY SAND WITH GRAVEL (SM), dark brown with olive brown mottling,
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moist, loose, woody debris (FILL)
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S-1
•
5.5 370.5+/-
5
14
2-2-2
N=4
S-2
SILTY SAND (SM), grayish brown to brown, moist, medium dense, sand
with silt interbeds (RECESSIONAL GLACIAL OUTWASH)
1
15
7-7-7
S 3
19
15
N=14
13.0 363+/-
SAND WITH SILT (SP-SM), light brown to brown, moist, dense to very
dense, silt interbeds (GLACIAL TILL)
15
16-27-28
decreasing silt content
17
N=55
S-4
9
6
18.0 358+/-
SANDY SILT (ML), light brown, moist, hard
rust staining observed in top of S-4, possible evidence of seasonal
•20.5 groundwater 355.5+/-
20--
X
18
-20-26
9N=46
N=46
S-5
SAND WITH SILT SP-SM , trace silt, brown, wet, dense
( �
becomes dark gray, very dense
25
17
18-30--30-36
S-6
25
89
25.5 350.5+/-
SILT (MLI, trace sand, gray, moist, hard
26.5 349.5+/-
Boring Terminated at 26.5 Feet
Stratification lines are appro)amate. In -situ, the transition may be gradual. Hammer Type: Automatic (ETR = 88 % )
Samples obtained using a 2" O.D. split spoon sampler Boring log updated from Dec. 2018
Advancement Method:
See E)ploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
and additional data (If any).
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with bentonite
Surface capped with concrete
Elevations were interpolated from a topographic site
nl
WATER LEVEL OBSERVATIONS
Boring
1 rerraco, i
Started: 12-05-2018
Boring Completed: 12-05-2018
While sampling
Drill Rig: D-50track
Driller: Holocene
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-5 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
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LOCATION See :nloration Plan
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Latitude: 47.8064' Longitude:-122.3308'
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Approximate Surface Elev.: 378 (Ft.) +/-
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DEPTH ELEVATION Ft.
OLU
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TOPSOIL, brown to dark brown, moist, loose
— '
1.0 377+/-
SILTY SAND (SM), trace gravel, yellowish brown to brown, moist, medium
dense, (RECESSIONAL GLACIAL OUTWASH)
5
3
9-8-4
S-1
N=12
6
14-14-10
S 2
N=24
1
11
14-24-50
N_74
S 3
10.5 367.5+/-
SILT ML yellowish brown to brown, moist, very stiff
11.0 �� Y rY 367+/-
POORLY GRADED SAND WITH SILT (SP-SM), trace gravel, yellowish
brown to grayish brown, moist, dense to very dense, (GLACIAL TILL)
15
11-17-26
S 4
N=43
15
14
16-19-18
S-5
N=37
16.5 361.5+/-
Boring Terminated at 16.5 Feet
Stratification lines are appro)amate. In -situ, the transition may be gradual. Hammer Type: Rope and Cathead
Samples obtained using a 2" O.D. split spoon sampler
Advancement Method:
See E)ploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
and additional data (If any).
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with bentonite upon completion.
Elevations were interpolated from a topographic site
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WATER LEVEL OBSERVATIONS
Boring
1 rerraco,
Started: 11-26-2019
Boring Completed: 11-26-2019
Groundwater not encountered
Drill Rig: Acker Soil Mechanic
Driller: Boretec
i
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-6 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
o
LOCATION See ':nloration Plan
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Latitude: 47.8064' Longitude:-122.3311'
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Approximate Surface Elev.: 378 (Ft.) +/-
0
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DEPTH ELEVATION Ft.
OLU
a
0.5 TOPSOIL, brown to dark brown, moist 377.5+/-
' !:
POORLY GRADED SAND WITH SILT AND GRAVEL (SP-SM), yellowish
°
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brown to brown, moist, medium dense, (RECESSIONAL GLACIAL
OUTWASH)
@S-1, wood debris. fine roots
4,
12
13-12-9
S-0
N=21
5
9
30-33-36
S-1
r115.5
372.5+/-
POORLY GRADED SAND (SP), yellowish brown to light brown, moist,
very dense, trace silt, trace gravel (GLACIAL TILL)
N=69
1
15
27-32-36
S 2
N=68
15
15
35-30-42
S-3
N=72
..:16.5
361.5+/-
Boring Terminated at 16.5 Feet
Stratification lines are appro)amate. In -situ, the transition may be gradual. Hammer Type: Rope and Cathead
Samples obtained using a 2" O.D. split spoon sampler
Advancement Method:
See E)ploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
and additional data (If any).
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with bentonite upon completion.
Elevations were interpolated from a topographic site
nl
WATER LEVEL OBSERVATIONS
Boring
1 rerraco,
Started: 11-26-2019
Boring Completed: 11-26-2019
Groundwater not encountered
Drill Rig: RCT60
Driller: Boretec
i
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-7 Paqe 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
o
LOCATION See Exploration Plan
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Latitude: 47.8066' Longitude:-122.3311'
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Approximate Surface Elev.: 378 (Ft.) +/-
0
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DEPTH ELEVATION Ft.
OLU
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0.5 TOPSOIL, brown to dark brown, moist 377.5+/-
POORLY GRADED SAND WITH SILT AND GRAVEL (SP-SM), yellowish
°
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brown to light brown, moist, (medium dense), (RECESSIONAL GLACIAL
OUTWASH)
'.
5.0 373+/-
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POORLY GRADED SAND WITH SILT AND GRAVEL (SP-SM), yellowish
°
rp
brown to light brown, moist, dense, (GLACIAL TILL)
13
9-21-24
S 1
N=45
:;Ifs
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°
8.5 369.5+/-
16
1 N136 1
S 2
SILTY SAND (SM), trace gravel, yellowish brown to brown, moist, dense
1
15
10-19-30
S-3
N=49
15
10-20-19
S-4
N=39
14.0 364+/-
Boring Terminated at 14 Feet
Stratification lines are appro)amate. In -situ, the transition may be gradual. Hammer Type: Rope and Cathead
Samples obtained using a 2" O.D. split spoon sampler
Advancement Method:
See Exploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
and additional data (If any).
See Supporting Information for a>planation of
symbols and abbreviations.
Abandonment Method:
Boring backflled with bentonite upon completion.
Elevations were interpolated from a topographic site
nl
WATER LEVEL OBSERVATIONS
Boring
1 rerraco,
Started: 11-26-2019
Boring Completed: 11-26-2019
Groundwater not encountered
Drill Rig: RCT60
Driller: Boretec
i
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173
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BORING LOG NO. B-8
Page 1 of 1
PROJECT: Edmonds Senior Living
CLIENT: CA Senior Living Holdings, LLC
Chicago, IL
SITE: 21200 72nd Ave. W
Edmonds, WA
(3
LOCATION See -)loration Plan
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Latitude: 47.8068' Longitude:-122.3311'
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Appropmate Surface Elev.: 380 (Ft.) +/-
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DEPTH ELEVATION(Ft.)O
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ASPHALT +
-TlzGGREGATE
BASE COURSE +
SILTY SAND WITH GRAVEL (SMI, grayish brown to dark brown, moist,
(medium dense), (FILL)
.
• 3.0 377+/-
10-26-27
POORLY GRADED SAND WITH SILT (SP-SMJ, trace gravel, yellowish
12
N-53
S 0
brown to brown, moist, dense to very dense, (GLACIAL TILL)
5
yellowish brown to light brown
14
10-19-25
S 1
N=44
18
16-25-28
S 2
N=53
1
yellowish brown to grayish brown
@S-4,increasing gravel content
15
12-19-19
S 3
N=38
18
12-21-25
S-4
N=46
15
18
8-17-27
S-5
N=44
16.5 363.5+/-
Boring Terminated at 16.5 Feet
Stratification lines are appro)dmate. In -situ, the transition may be gradual. Hammer Type: Rope and Cathead
Samples obtained using a 2" O.D. split spoon sampler
Advancement Method:
See E)ploration and Testing Procedures for a
Notes:
Hollow Stem Auger
description of field and laboratory procedures used
@S-1, S 3, and S 4, rock fragments, blow count might be over
and additional data (If any).
stated
See Supporting Information for eplanation of
symbols and abbreviations.
Abandonment Method:
Boring backfilled with bentonite
Surface capped with concrete
Elevations were interpolated from a topographic site
WATER LEVEL OBSERVATIONS
Boring
Irerracon
Started: 11-26-2019
Boring Completed: 11-26-2019
Groundwater not encountered
Drill Rig: RCT60
Driller: Boretec
21905 64th Ave W, Ste 100
Mountlake Terrace, WA Project
No.: 81185173