0103_001NELSON
GEOTECHNICAL
ASSOCIATES, INC.
17311 135" Ave. NE #A-500
FIELD REPORT
Project:
Owner:
Location:
Weather:
Woodinville, WA 98072 Purpose of
(425) 486-1669 FAX 481-2510 Visit:
East Wenatchee, WA 98802
(509)665-7696
Trieu Patio Development
Paul Trieu
7011 Lake Ballinger Way
Edmonds, WA
Sunny, 60's
Geotechnical Consultation and
Construction Monitoring
File No.: 1180220
Date: 5/12/2020
Report No: 1
Page 1 of 3
By: ABR
We visited the site today at the request of Roger Wilson with Premier Homes on behalf of the home
owner to provide geotechnical consultation and earthwork construction monitoring services for the
construction of the elevated patio structure at the site at 7011 Lake Ballinger Way in Edmonds,
Washington.
Upon arriving to the site we met with Ross the landscape contractor to discuss plans. We were informed
the contractors were in the process of excavating foundation lines for the proposed retaining walls
around the perimeter of the new elevated paver patio area. Upon reaching subgrade elevation or below
for the northern and eastern portions of the proposed retaining wall, we were informed that loose
saturated soils were encountered.
We observed that the northern and eastern retaining wall alignments were excavated approximately 5-
feet and 2- to 3-feet below the adjacent existing grade, respectively, while the western excavation was
not yet finished. We evaluated the base of excavations along the northern and eastern proposed retaining
wall alignments with a 1/2 diameter steel probe rod under moderate pressure. We were generally able to
probe 3- to 5-inches along the eastern line and 18- to 24-inches along the lower northern excavation,
which we interpreted as loose to medium dense and loose, respectively. We observed the sidewalls and
base of the excavations and observed dark brown undocumented fill soils underlain by gray sandy
materials at the base, which we interpreted as native soils. We also observed significant groundwater
seeping into the lower northern excavation.
Due to the loose soils encountered at roughly subgrade or below we recommended the contractors place
a minimum of 2-feet of 2- to 4-inch quarry spalls within the base of the existing approximately 5-foot
overexcavation trench along the northern portion of the wall and compact to a firm and unyielding state.
We recommended the span reinforced base extend a minimum of 1-foot outside of the wall base on
either side. Similarly, we recommended overexcavating the eastern and western retaining wall
alignments a minimum of 1-foot and replacement with 1.25-inch minus crushed rock due to the lack of
groundwater seepage water and relatively higher density. The contractor agreed with the
recommendations.
Attachment: Site Plan
Signed: _ AJ144V
Distribution: Alex Rinaldi
FIELD REPORT
NELSON
Project:
Trieu Patio Development
GEOTECHNICAL
Owner:
Paul Trieu
ASSOCIATES, INC.
Location:
7011 Lake Ballinger Way
Edmonds, WA
17311 135TH Ave. NE #A-500
Weather:
Sunny, 60's
Woodinville, WA 98072
Purpose of
Geotechnical Consultation and
(425) 486-1669 FAX 481-2510
Visit:
Construction Monitoring
East Wenatchee, WA 98802
(509)665-7696
File No.: 1180220
Date: 5/12/2020
Report No: 1
Page 2of3
K-19WEIVO."I"
Our opinions are based on observations while on site. We will continue to monitor the construction of
the earthwork phase of the patio and retaining wall development project on a part time basis and are able
to return to the site upon request.
Attachment: Site Plan Signed:
Distribution: Alex Rinaidi
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NELSON
Project:
Trieu Patio Development
GEOTECHNICAL
Owner:
Paul Trieu
ASSOCIATES, INC.
Location:
7011 Lake Ballinger Way
Edmonds, WA
7311 1351 Ave. NE #A-500
Weather:
Cloudy, 60's
Woodinville, WA 98072
Purpose of
Geotechnical Consultation and
(425) 486-1669 FAX 481-2510
Visit:
Construction Monitoring
East Wenatchee, WA 98802
(509)665-7696
File No.: 1180220
Date: 5/14/2020
Report No: 2
Page 1 of 3
By: ABR
We visited the site today at the request of Roger Wilson with Premier Homes on behalf of the home
owner to provide geotechnical consultation and earthwork construction monitoring services for the
construction of the elevated patio structure at the site at 7011 Lake Ballinger Way in Edmonds,
Washington.
Upon arriving to the site we met with Ross the landscape contractor to discuss plans. We were informed
the northern retaining wall alignment excavation was filled with the recommended 2-feet of spalls
spanning a zone approximately 7-feet wide (north -south) along with 1.25 inch minus crushed rock to fill
the excavation back to grade (approximately 3-feet). Additionally, we were informed that all of the
undocumented fill soils in the backfill zone behind the planned walls were removed and approximately
18 -inches of type 17 structural fill was placed, such that the backfill zone and base of wall elevation
were roughly equal. We were also informed the block wall would be constructed with Baslite Geowall
Pro blocks and Miragrid 5XT geogrid placed 16- and 32-inches up from the base of the wall.
We evaluated the surface of the fill placed within the northern wall alignment and the backfill zone with
a 1/2-inch diameter steel probe rod. We were generally able to probe 1- to 2-inches wluch we interpreted
as medium dense or better conditions. We observed that the materials were compacted with large walk -
behind vibratory plate compactors. We also performed in -place nuclear densometer tests on the type 17
backfill behind the proposed walls and obtained results greater than or equal to 95 percent compaction
per ASTM D 1557 as shown on the attached density tests results sheet. Based on the results of our in -
place density tests and probing evaluation it is our opinion that the backfill materials were placed and
compacted adequately. We will return to the site to evaluate the remaining fill material to be placed in
the backfill zone.
Our opinions are based on observations while on site. We will continue to monitor the construction of
the earthwork phase of the patio and retaining wall development project on a part time basis and are able
to return to the site upon request.
Attachment: Site Plan, Density Test Results
Signed:i�=��
Distribution: Alex Rinaldi
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NELSON GEOTECHNICAL
` ASSOCIATES, ��.
N �"' A I�IN-PLACE MOISTURE AND DENSITY TESTS
GEOTECHNICAL ENGINEERS & GEOLOGISTS
Project Name: Trieu Residence Patio Development
Job Number: 11802-20
Location: Edmonds, WA
Report Number: 02
Page: 3 of 3
Proctor Method:
ASTM D-698-91 / X ASTM D-1557-91
Test Conducted bv: ABR
DATE
TEST
NUMBER
APPROX. FEET
TO GRADE
APPROX.
FILL DEPTH
PERCENT
MOISTURE
WET
DENSITY
DRY
DENSITY
MAX.
DENSITY
%
COMP.
%
SPEC.
COMMENTS
HAMMER
BLOWS
PASS /
FAIL
5/14/2020
DTI
4
1.5
5.1
135.8
129.2
136.0
95
95
Type 17
18
Pass
5/14/20
DT2
4
1.5
4.9
140.8
134.2
136.0
99
95
Type 17
15
Pass
5/14/20
DT3
4
1.5
4.0
140.5
135.1
136.0
99
95
Type 17
16
Pass
FIELD REPORT
NELSON
Project:
Trieu Patio Development
File No.: 1180220
GEOTECHNICAL
Owner:
Paul Trieu
Date: 5/15/2020
ASSOCIATES, INC.
Location:
7011 Lake Ballinger Way
Report No: 3
Edmonds, WA
17311 135' Ave. NE #A-500
Weather:
Cloudy, 60's
Page 1 of 3
Woodinville, WA 98072
Purpose of
Geotechnical Consultation and
(425) 486-1669 FAX 481-2510
Visit:
Construction Monitoring
By: AJS
East Wenatchee, WA 98802
(509)665-7696
We visited the site today at the request of Roger Wilson with Premier Homes on behalf of the home
owner to provide geotechnical consultation and earthwork construction monitoring services for the
construction of the elevated patio structure at 7011 Lake Ballinger Way in Edmonds, Washington.
Upon arriving to the site we met with Ross the landscape contractor to discuss plans. We were informed
that the northern retaining wall alignment had been filled with an additional 4 inches of 5/8" minus
crushed rock for a leveling pad. Additionally, we were informed that more type 17 had been added to
the backfill zone behind the proposed walls and another 12-inches of type 17 structural fill was placed.
Placement of the retaining wall blocks would begin later in the day.
We evaluated the surface of the fill placed within the northern wall alignment and the backfill zone with
a 1/2-inch diameter steel probe rod. We were generally able to probe 1 to 2-inches which we interpreted
as medium dense or better conditions. We observed that the materials being compacted with large walk -
behind vibratory plate compactor and a small vibratory drum roller. We also performed in -place nuclear
densometer tests on the type 17 backfill behind the proposed walls and obtained results greater than or
equal to 95 percent compaction per ASTM D 1557 as shown on the attached density tests results sheet.
We were informed that backfrlling of the retaining wall would happen throughout the day, and were
requested to return later in the day to test an additional 6 inch layer of type 17 backfill.
PM Visit: In -place density test results indicated 95 percent or better compaction. Based on the results of
our in -place density tests and probing evaluation it is our opinion that the backfill materials observed
today were placed and compacted adequately. We will return to the site to evaluate the remaining fill
material to be placed in the backfill zone on Monday, 5/18/2020.
Our opinions are based on observations while on site. We will continue to monitor the construction of
the earthwork phase of the patio and retaining wall development project on a part time basis and are able
to return to the site upon request.
Attachment: Site Plan, Density Test Results
Distribution:
Signed: rim
Austin Slabaugh
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NELSON GEOTECHNICAL
N �A ASSOCIATES, INC. IN -PLACE MOISTURE AND DENSITY TESTS
GEOTECHNICAL ENGINEERS & GEOLOGISTS
Project Name: Trieu Residence Patio Development
Job Number: 11802-20
Location: Edmonds, WA
Report Number: 03
Page: 3 of 3
Proctor Method: ASTM D-698-91 / X ASTM D-1557-91
Test Conducted bv: AJS
DATE
TEST
NUMBER
APPROX. FEET
TO GRADE
APPROX.
FELL DEPTH
PERCENT
MOISTURE
WET
DENSITY
DRY
DENSITY
MAX.
DENSITY
%
COMP.
%
SPEC.
COMMENTS
HAMMER
BLOWS
PASS /
FAIL
5/15/2020
DTI
2
2
2.6
132.4
129.0
136.0
95
95
Type 17
17
Pass
5/15/20
DT2
2
2
4.1
135.6
130.3
136.0
96
95
Type 17
16
Pass
5/15/20
DT3
1.5
2.5
3.7
135.0
130.2
136.0
96
95
Aftemoon
20
Pass
FIELD REPORT
NELSON Project:
GEOTECHNICAL Owner:
ASSOCIATES, INC. Location:
17311 135TH Ave. NE #A-500 Weather:
Woodinville, WA 98072 Purpose of
(425) 486-1669 FAX 481-2510 Visit:
East Wenatchee, WA 98802
(509)665-7696
Trieu Patio Development
Paul Trieu
7011 Lake Ballinger Way
Edmonds, WA
Cloudy, 60's
Geotechnical Consultation and
Construction Monitoring
File No.: 1180220
Date: 5/18/2020
Report No: 4
Page 1 of 3
By: AJS
We visited the site today at the request of Roger Wilson with Premier Homes on behalf of the home
owner to provide geotechnical consultation and earthwork construction monitoring services for the
construction of the elevated patio structure at 7011 Lake Ballinger Way in Edmonds, Washington.
Upon arriving to the site, we met with the landscape workers, to discuss plans. We observed that the
contractors were in the process of constructing the block walls and the northern wall was currently 4
blocks high and type 17 backfill was approximately level with top of wall. An approximately 18 inch
wide zone of free draining rock consisting of 1.25 clean was placed behind the northern wall and was
separated from the type 17 by filter fabric to form a drainage chimney behind the wall. We also
observed 4-inch wall drains were installed behind the base of the wall and daylighting the base of the
wall in the western corner into a gravel bed. Although not directly observed, we were informed geogrid
was placed behind the eastern and western wall alignments and saw the geogrid onsite ready to install.
We evaluated the surface of the fill placed within the northern wall alignment and the backfill zone with
a 1/2-inch diameter steel probe rod. We were generally able to probe 1 to 2-inches which we interpreted
as medium dense or better conditions. We were told that the backfill was compacted with the small
vibratory drum roller. We also performed in -place nuclear densometer tests on the type 17 backfill
behind the proposed walls and obtained results greater than or equal to 95 percent compaction per
ASTM D 1557 as shown on the attached density tests results sheet. Based on the results of our in -place
density tests and probing evaluation it is our opinion that the backfill materials were placed and
compacted adequately.
Our opinions are based on observations while on site. We will continue to monitor the construction of
the earthwork phase of the patio and retaining wall development project on a part time basis and are able
to return to the site upon request.
Attachment: Site Plan, Density Test Results
Distribution:
Signed: A111A. EOM
Austin Slabaugh
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Project Name: Trieu Residence Patio Development
Job Number: 11802-20
Location: Edmonds, WA
Report Number: 04
Page: 3 of 3
Proctor Method:
ASTM D-698-91 / X ASTM D-1557-91
Test Conducted by: AJS
DATE
TEST
NUMBER
APPROX. FEET
TO GRADE
APPROX.
FILL DEPTH
PERCENT
MOISTURE
WET
DENSITY
DRY
DENSITY
MAX.
DENSITY
%
COMP.
%
SPEC.
COMMENTS
HAMMER
BLOWS
PASS I
FAIL
1/11/2020
DTI
0.5
3.5
5.0
136.4
129.9
136.0
96
95
Type 17
19
Pass
5/18/20
DT2
0.5
3.5
6.3
137.9
129.7
136.0
95
95
Type 17
22
Pass