Geotech soils report for vault.pdfTerracon Consultants, Inc.
Geotechnical Engineers and Environmental Consultants
21905 — 64t" Ave. West, Suite 100, Mountlake Terrace, Washington 98043 (425) 771-3304 / FAX (425) 771-3549
DAILY FIELD REPORT: 001
PROJECT: Edmonds Memory Care
CLIENT: RJ Development Services
TERRACON FIELD REP: Tori Hesedahl
ARR. / DEP. TIME: 12:30/13:30
WEATHER: Sunny, 70's
DATE: July 20, 2015 PAGE 1 OF 1
10 019 C11►`[11M3f r,r-M1L'L1
CONTRACTOR: Koelseh Construction
LOCATION: 21006 72"d ST SW, Edmonds, WA
PERMIT NUMBER: BLD2015-0744
EQUIPMENT USED: Refer to text
A Terracon representative visited the project site on behalf of the client, RJ Development Services, to observe
the stormwater vault subgrade.
Prior to our arrival, the contractor had excavated for the stormwater vault near the southeast corner of the
property. Terracon probed the exposed subgrade soil with a '/2-inch diameter steel T-probe and observed
penetration depths of approximately 1 inch or less. Subgrade soils generally consisted of silty, gravelly sands
and appeared generally consistent with soil descriptions for the site presented in the Geotechnical Engineering
Report. In our opinion, the exposed soils are suitable to support the planned storm water vault.
A 4-inch to 6-inch thick loose layer of 5/8-inch minus crushed rock had been placed over about the north half of
the stormwater vault excavation to level the subgrade. The plans indicate that the cast in place concrete should
be placed over dense native subgrade soils. We recommend that the crushed rock already placed and any
subsequently placed crushed rock be compacted with a vibrating steel drum roller to a firm and unyielding
condition prior to placing rebar and concrete.
A Terracon representative will return to the site at the request of the contractor to evaluate further earthwork.
REVIEWED BY: —Ryan Scheffler, P.E.
This report presents opinions formed as a result of our observations of the contractors activities relating to geotechnical engineering. We rely on the contractor to
comply with the plans and specifications throughout the duration of the project irrespective of the presence of the Terracon field representative. The presence of our
field representative will be for the purpose of providing observation and field testing services. Our work does not include supervision or direction of the actual work of
the contractor, its employees, or agents. Neither the presence of the Terracon field representative nor the observation and testing by Terracon shall excuse the contractor
in any way for defects discovered in its work. Terracon will not be responsible for job or site safety on this project.
Terracon Consultants, Inc.
Geotechnical Engineers and Environmental Consultants
21905 — 64th Ave. West, Suite 100, Mountlake Terrace, Washington 98043 (425) 771-3304 / FAX (425) 771-3549
DAILY FIELD REPORT: 002
PROJECT: Edmonds Memory Care
CLIENT: RJ Development Services
TERRACON FIELD REP: Tori Hesedahl
ARR. / DEP. TIME: 09:30/10:00
WEATHER: Sunny, 70's
DATE: July 22, 2015 PAGE 1 OF 1
10 11C1►`[1 3f rlr-M1L'L1
CONTRACTOR: Koelsch Construction
LOCATION: 21006 72"d ST SW, Edmonds, WA
PERMIT NUMBER: BLD2015-0744
EQUIPMENT USED: Refer to text
A Terracon representative visited the project site on behalf of the client, RJ Development Services, to observe
the stormwater vault subgrade.
Since our previous visit, it was determined that the storm water vault excavation had been cut too deep by
approximately one foot. Prior to our arrival, the earthwork contractor placed and compacted a one foot thick
(compacted thickness) lift of native soil across the base of the excavation from the onsite stockpile. The
earthwork contractor reported that compactive effort had been applied with a Vibromax 605 single vibrating
drum roller, which was observed to be onsite by Terracon.
Terracon probed the exposed subgrade soil with a '/2-inch diameter steel T-probe and observed penetration
depths of approximately 1 inch or less. Terracon observed construction equipment including a small track hoe,
and a rubber tired back hoe operating atop the fill while fine grading the edges of the excavation. The
compacted fill appeared firm and unyielding under the observed equipment loads.
Terracon verbally reported the observations and recommendations above to Scott, superintendent for Koelsch
Construction, prior to their departure.
Subgrade soils generally consisted of silty, gravelly sands and appeared generally consistent with soil
descriptions for the site presented in the Geotechnical Engineering Report. In our opinion, the one foot fill
placed over the undisturbed native subgrade is suitable to support the planned storm water vault.
A Terracon representative will return to the site at the request of the contractor to evaluate further earthwork.
REVIEWED BY: —Ryan Scheffler, P.E.
This report presents opinions formed as a result of our observations of the contractors activities relating to geotechnical engineering. We rely on the contractor to
comply with the plans and specifications throughout the duration of the project irrespective of the presence of the Terracon field representative. The presence of our
field representative will be for the purpose ol'providing observation and field testing services. Our work does not include supervision or direction of the actual work of
the contractor, its employees, or agents. Neither the presence of the Terracon field representative nor the observation and testing by Terracon shall excuse the contractor
in any way for defects discovered in its work. Terracon will not be responsible for job or site safety on this project.
Irerracon
Consulting Engineers & Scientists
21905 64"' Ave. West, Ste. 100, Mountlake Terrace, Washington 98043 (425) 771-3304 / FAX: (425) 771-3549
DAILY FIELD REPORT: 010 DATE: August 26, 2015 PAGE 1 OF 1
PROJECT: Edmonds Memory Care
CLIENT: RJ Development Services
TERRACON FIELD REP: D. Detterich
ARR. / DEP. TIME: 1:OOPM/1:30PM
WEATHER: Sunny, low 700s
TERRACON PROJECT NO.: 81145006A
CONTRACTORS: Koelsch Construction Inc.,
Tastad Construction Inc.
LOCATION: 21006 72nd St SW, Edmonds, Washington
PERMIT NUMBER: BLD2015-0744
EQUIPMENT: Refer to text
A Terracon representative visited the project site at the request of the contractor to observe drainage and
waterproofing for the storm vault.
Upon our arrival, we inspected drainage installation around the perimeter of the stormwater vault. Six-inch
diameter perforated pipe was placed at top of footing and wrapped with clean free draining round rock.
Waterproof barrier was installed around exterior walls. Work appears to be in general accordance with approved
plans and specifications.
A representative of Terracon will visit the site for observation of backfill placement and compaction for the
vault tomorrow afternoon.
REVIEWED BY: Ryan Scheffler, P.E.
This report presents opinions formed as a result of our observations of the contractors activities relating to geotechnical engineering. We rely on the contractor to
comply with the plans and specifications throughout the duration of the project irrespective of the presence of the Terracon field representative. The presence of our
field representative will be for the purpose of providing observation and field testing services. Our work does not include supervision or direction of the actual work of
the contractor, its employees, or agents. Neither the presence of the Terracon field representative nor the observation and testing by Terracon shall excuse the
contractor in anyway for defects discovered in its work. Terracon will not be responsible for job or site safety on this project.
Irerracon
Consulting Engineers & Scientists
21905 64t" Ave. West, Ste. 100, Mountlake Terrace, Washington 98043 (425) 771-3304 / FAX: (425) 771-3549
DAILY FIELD REPORT: 011 DATE: August 27, 2015 PAGE 1 OF 2
PROJECT: Edmonds Memory Care
CLIENT: RJ Development Services
TERRACON FIELD REP: Dave Bernier
ARR. / DEP. TIME: 12:00pm/2:OOPM
WEATHER: Sunny, low 80's
TERRACON PROJECT NO.: 81145006A
CONTRACTORS: Koelsch Construction Inc.,
Tastad Construction Inc.
LOCATION: 21006 72"d St SW, Edmonds, Washington
PERMIT NUMBER: BLD2015-0744
EQUIPMENT: Refer to text
A Terracon representative visited the project site at the request of the contractor to perform moisture -density
testing on previously placed backfill on the west, north and south sides of the stormwater vault
We observed the contractor place and compact an approximately 3 to 4 foot wide area of soil between the vault
and soil cut face in lifts with a mini track hoe with attached hoe pack.
We performed 5 compaction tests on the compacted material with a nuclear densometer. Tests indicated that the
minimum of 90% relative density of ASTM:D1557 noted on sheet S1 was achieved. At the time of our
departure, backfill was approximately 12 to 16 inches below the top of the vault stem walls.
Terracon will return to the site upon request for further earthwork and backfill observation.
REVIEWED BY: Ryan Scheffler, P.E.
This report presents opinions formed as a result of our observations of the contractors activities relating to geotechnical engineering. We rely on the contractor to
comply with the plans and specifications throughout the duration of the project irrespective of the presence of the Terracon field representative. The presence of our
field representative will be for the purpose of providing observation and field testing services. Our work does not include supervision or direction of the actual work of
the contractor, its employees, or agents. Neither the presence of the Terracon field representative nor the observation and testing by Terracon shall excuse the
contractor in any way for defects discovered in its work. Terracon will not be responsible for job or site safety on this project.
Irerracon
Consulting Engineers & Scientists
21905 64"' Ave. West, Ste. 100, Mountlake Terrace, Washington 98043 (425) 771-3304 / FAX: (425) 771-3549
DAILY FIELD REPORT: 011 DATE: August 27, 2015 PAGE 2 OF 2
PROJECT: Edmonds Memory Care
Table 1—Summary of Field Density Test Results
TERRACON JOB NO.: 81145006A
Feet
Field
%
Test. No.
Test Date
General Location
Elev. (ft)
to
Material
Type
Dry
D(epn
% Field
Moisture
Compaction
Pass/Fail
Grade
fly
Field
1
8/27/15
West side vault middle
-
-14"
1
124.3
8.3
92
P
2
8/27/15
North side vault west 1/3
-
-14"
1
122.4
7.8
90
P
3
8/27/15
North side vault middle
-
-16"
1
122.0
7.5
90
P
4
8/27/15
North side vault East 1/2
-
-16"
1
126.9
8.0
93
P
5
8/27/15
East side vault middle
-
-14"
1
124.0
6.9
92
P
Percent compaction based on:
❑ Standard proctor, ASTM D698
® Modified proctor, ASTM D1557
❑ Other
Test method:
® N = Nuclear (ASTM D6938)
❑ SC = Sand Cone (ASTM D1556)
❑ DC = Drive Cylinder (ASTM D2937)
Guage: Troxler 3440 (SN 31207)
Specification:
90% D698
95% D698
90% D1557
95% D1557
Other
Material
Reference
Max. Dry
Optimum
Type
Sample No.
Material Description
Density
Moisture
(pcf)
(%)
1
Brown Silty Sand w/Gravel
135.3
8.1