HomeMy WebLinkAboutAPPROVED_ES16_Geotech Addendum Report_ROW Improvements_220526
Kirkland | Tacoma | Mount Vernon
425-827-7701 | www.aesgeo.com
May 18, 2022
Project No. 20180398E002
Renton School District No. 403
7812 South 124th Street
Seattle, Washington 98178
Attention: Traci Brewer-Rogstad
Subject: Geotechnical Recommendations Addendum Report
Right-of-Way Improvements
Renton School District Elementary School #16
1075 Duvall Avenue NE
Renton, Washington
References: Updated Subsurface Exploration and Geotechnical Engineering Report
Renton School District Elementary School #16
1075 Duvall Avenue NE
Renton, Washington
Dated December 22, 2020
New Elementary No. 16
Renton School District No. 403
Volumes I, II, III - Permit Resubmittal 90% CD
Prepared by Hutteball+Oremus Architecture
Dated December 3, 2021
Dear Ms. Brewer-Rogstad:
As requested, this report presents an addendum to our previous geotechnical report to provide
recommendations for the proposed off-site, right-of-way, and frontage improvements at the
Elementary No. 16 project in Renton, Washington (Figure 1). This work represents a continuation
of our participation on the project, which has included completion of subsurface explorations,
preparation of geotechnical engineering reports, consultation throughout the design process,
and geotechnical construction observations of work completed to date.
SITE AND PROJECT DESCRIPTION
The site includes 15 former residential parcels that were combined, and two City of Renton
Rights-of-Way parcels totaling 12.77 acres in total area. The parcels were previously developed
Renton School District Elementary School #16 Geotechnical Recommendations Addendum Report
Renton, Washington Right-of-Way Improvements
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with homes and mature landscaping. Initial site demolition has been completed with only
subsurface utilities remaining onsite. The project includes constructing a new two-story
elementary school with a parking lot, bus loop, grass playfield, hard-surfaced play area, and
associated landscaping, hardscapes, and underground utilities. Extensive off-site, right-of-way,
and frontage improvements are proposed. Based on the above-referenced 90% CD project plans
provided by Hutteball+Oremus Architecture, we understand that the frontage and off-site
improvements associated with the project will include:
• Connecting the asphalt-paved bus loop to Duvall Avenue NE from STA 18+00 to STA 21+40
and from STA 26+28 to STA 26+88.
• Concrete curb and sidewalk along the west shoulder of Duvall Avenue NE from NE 12th
Street to NE 10th Street (approximately 1,250 lineal feet).
• 14 luminaires along the Duvall Avenue NE project frontage.
• Mast arm traffic signal poles, sign poles, and pedestrian pedestals on each corner of the
intersection of Duvall Avenue NE and NE 10th Street (10 total new foundations).
• Three new flashing beacon sign poles: NE corner of NE 10th Street and Chelan PL NE,
SW corner of NE 10th Street and Bremerton CT NE, and the west shoulder of Duvall
Avenue NE at STA 26+10.
• Driveway repairs and improvements to the neighboring Jehovah’s Witnesses property.
The purpose of our study is to provide additional subsurface exploration data and geotechnical
engineering recommendations for use in design of the improvements in the bulleted list above.
Our study included a review of selected available geologic literature, advancing 10 additional
hollow-stem auger and vacuum explorations, and performing geologic studies to assess the type,
thickness, distribution, and physical properties of the subsurface sediments and shallow
groundwater. Geotechnical engineering studies were completed to formulate recommendations
for support of the off-site improvements in the bulleted list above. This report should act as an
addendum to our above-cited geotechnical report and summarizes our fieldwork and offers
recommendations based on our present understanding of the project.
SUBSURFACE EXPLORATION
Our field study included drilling six hollow-stem auger exploration borings (EB’s) and excavating
four vacuum-truck assisted borings (VB’s) to obtain subsurface information about the site.
Exploration work was completed under a City of Renton right-of-way work permit. The various
types of sediments, as well as the depths where characteristics of the sediments changed, are
indicated on the exploration logs presented in Appendix A. Hollow-stem auger borings completed
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Renton, Washington Right-of-Way Improvements
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for this supplementary study were numbered consecutively with borings previously completed
onsite for the above-referenced geotechnical engineering study. The depths indicated on the logs
where conditions changed may represent gradational variations between sediment types in the
field. The explorations were approximately located in the field relative to known site features.
The approximate locations of all of our on-site and off-site explorations are shown on Figure 2.
The conclusions and recommendations presented in this report are based, in part, on the
subsurface conditions encountered in our explorations. The locations, depths, and number of
explorations were selected within site and budgetary constraints. It should be noted that
subsurface conditions differing from those depicted on the logs in Appendix A may be present at
the site due to the random nature of deposition and the alteration of topography by past grading
and/or filling. The nature and extent of any variations beyond the field exploration may not
become fully evident until construction. If variations are observed at that time, it may be
necessary to re-evaluate specific recommendations in this report and make appropriate changes.
Exploration Borings
Six supplementary exploration borings were completed using a limited-access,
rubber-track-mounted, hollow-stem auger drilling rig under subcontract to AESI. During the
drilling process samples were generally obtained at 2.5 to 5-foot-depth intervals. The borings
were continuously observed and logged by a geologist from our firm. The exploration logs
presented in Appendix A are based on the field logs, drilling action, and inspection of the samples
secured.
During drilling, disturbed but representative samples were obtained using the Standard
Penetration Test (SPT) procedure in accordance with ASTM International (ASTM) D-1586. This
test and sampling method consists of driving a standard, 2-inch, outside-diameter, split-barrel
sampler a distance of 18 inches into the soil with a 140-pound hammer free-falling a distance of
30 inches. The number of blows for each 6-inch interval is recorded and the number of blows
required to drive the sampler the final 12 inches is known as the Standard Penetration Resistance
(“N”) or blow count. If a total of 50 is recorded within one 6-inch interval, the blow count is
recorded as the number of blows for the corresponding inches of penetration. The resistance, or
N-value, provides a measure of the relative density of granular soils or the relative consistency of
cohesive soils; these values are plotted on the attached exploration boring logs.
The samples obtained from the split-barrel sampler were classified in the field by a geologist from
our firm and representative portions placed in watertight containers. The samples were then
transported to our laboratory for further visual classification, as described below.
Vacuum Assisted Borings
Four vacuum assisted borings were completed by a vacuum truck using dry suction and a high-
pressure air knife. During excavation, AESI acquired representative samples using a
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Renton, Washington Right-of-Way Improvements
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hand-operated, 4-inch-diameter soil auger and other hand tools. As excavation progressed, AESI
conducted Dynamic Cone Penetrometer tests to estimate the relative density of soils
encountered. Each vacuum-assisted boring was excavated between 7 and 7.5 feet below existing
grade.
Samples collected with the hand auger were classified in the field by a geologist from our firm,
and representative portions were placed in watertight containers. The samples were then
transported to our laboratory for further visual classification, as described below.
Previous Explorations by AESI
AESI previously conducted subsurface explorations on the project site for the above-referenced
geotechnical report. Previously completed explorations included borings distributed throughout
the project site that encountered subsurface conditions similar to those described below. The
locations of subsurface exploration borings for our previous phases of work are displayed on
Figure 2 and interpretive exploration logs are included as Appendix A.
AESI also completed five direct-push Geoprobe explorations associated with soils with potential
hydrocarbon odor that were unexpectedly encountered during geotechnical drilling. Geoprobe
exploration data were not relied on to formulate conclusions and recommendations contained
in this report. Copies of the Geoprobe exploration logs are available on request but are not
included in Appendix A.
SUBSURFACE CONDITIONS
Stratigraphy
The subsurface explorations summary that follows is limited to supplementary explorations
completed offsite in support of frontage and off-site improvements.
Subsurface conditions in the off-site improvement areas were inferred from the field
explorations accomplished for this study and previous studies, visual reconnaissance of the site,
and review of selected applicable geologic literature. As shown on the exploration logs, the
overall stratigraphic sequence observed in our explorations included topsoil and fill underlain by
glacially derived sediments. The following section presents more detailed subsurface information
on the sediment types encountered at the site.
Grass/Topsoil
A surficial layer of grass and/or organic-rich topsoil was encountered at all supplementary
explorations completed offsite for this addendum. Topsoil was observed to be approximately
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Renton, Washington Right-of-Way Improvements
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8 inches thick in all the supplementary explorations except VB-2 where it was observed to be
approximately 1 foot thick. Topsoil is not considered suitable for foundation support.
Fill
Explorations EB-23, EB-24, EB-26, and vacuum boring VB-3 encountered fill of variable thickness
and composition. Where encountered, observed fill depths ranged from 5 to 7.5 feet.
Vashon Recessional Outwash
Underlying the topsoil at exploration boring EB-25, our exploration encountered medium dense,
stratified, orangish brown, fine to medium sand, with some gravel and some silt. We interpret
these sediments to be representative of Vashon recessional outwash. Vashon recessional
outwash was deposited from meltwater streams extending from a retreating glacial ice sheet
near the end of the Vashon Stade of the Fraser Glaciation, approximately 12,500 to 15,000 years
ago. Recessional outwash is suitable for structural loads when prepared as recommended in this
report.
Vashon Lodgement Till
Underlying the topsoil, fill, or recessional outwash, all explorations encountered dense to very
dense, unsorted, brownish gray to gray, silty fine sand, with some gravel. We interpret these
sediments as representative of Vashon lodgement till. The Vashon lodgement till was deposited
directly from basal, debris-laden glacial ice during the Vashon Stade of the Fraser Glaciation,
approximately 12,500 to 15,000 years ago. The high relative density characteristic of the Vashon
lodgement till is due to its consolidation by the massive weight of the glacial ice from which it
was deposited. Lodgement till is suitable for support of structural loads when prepared as
recommended in this report.
Regional Geologic Mapping Review
We reviewed a regional geologic map (J.C. Yount, J.P. Minard, and G.R. Dembroff, 1993, Geologic
Map of Surficial Deposits in the Seattle 30’ by 60’ Quadrangle, Washington: U.S. Geological
Survey, Open-File Report 93-233, scale 1:100,000). The referenced map indicates that the site is
expected to be underlain at shallow depths by Vashon lodgement till. Our on-site explorations
and interpretations are generally consistent with the conditions depicted on the referenced
published map.
Hydrology
Groundwater was encountered at shallow depths at the time of exploration in each of the
supplementary explorations except VB-1. We interpret this shallow perched groundwater as
“interflow” present within existing fill, recessional outwash, and the upper, weathered
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lodgement till sediments. Interflow occurs when surface water infiltrates down through relatively
permeable soils such as the fill and recessional outwash sediments and becomes trapped or
“perched” atop a comparatively very low-permeability barrier such as silty unweathered
lodgement till. This perched water may travel laterally above less-permeable strata. The
explorations for this study occurred in early April when the interflow network is commonly
saturated. The duration and quantity of perched seepage will largely depend on the soil grain-size
distribution, topography, seasonal precipitation, on- and off-site land usage, and other factors.
Seepage quantities will likely be higher in low-lying areas with thicker fill or recessional outwash
overlying lodgement till, such as near EB-24 and EB-25.
DESIGN RECOMMENDATIONS
Our explorations indicate that, from a geotechnical engineering standpoint, the proposed
off-site, right-of-way, and frontage improvements are feasible if the recommendations in our
previous geotechnical report and in this addendum are implemented. The above-referenced
geotechnical report provides recommendations for site preparation, grading, types of suitable
foundations and floors, allowable foundation soil bearing pressure, anticipated foundation and
floor settlement, drainage considerations, and infiltration feasibility. We recommend that these
recommendations be used in design and construction of the proposed bus loop pavement
connection to Duvall Avenue NE and sidewalks and curbs along the Duvall Avenue NE frontage.
We recommend the proposed mast arm signal poles, luminaires, and smaller structures such as
pedestrian push buttons and strobes along Duvall Avenue NE be supported by drilled shaft
foundations with sufficient embedment depth to provide the necessary lateral resistance at each
pole site. Frontage improvement elements, Washington State Department of Transportation
(WSDOT) Standard Plan references, and geotechnical design parameters are summarized below.
Mast Arm Signal Pole Foundation Recommendations
The soils observed at the proposed mast arm signal pole locations varied and included loose to
medium dense fill, and dense to very dense lodgement till. The estimated standard penetration
resistance at these locations varied as well. We recommend using the following allowable lateral
bearing pressures, based on Table 17.2 of the WSDOT Geotechnical Design Manual and estimated
SPT N-Values. The Recommended Allowable Lateral Bearing Pressure values presented below
should be used together with Standard Plan J-26.10-03 to determine foundation diameters and
depths for mast arm signal poles:
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Recommended Lateral Bearing Capacity
Mast Arm Signal Poles
Duvall Avenue NE and NE 10th Street Intersection
Intersection
Corner AESI Exploration
Recommended Allowable Lateral
Bearing Pressure (psf)*
NW VB-1 2,500
NE VB-4 2,500
SE VB-3 1,000
SW VB-2 2,500
* Washington State Department of Transportation Geotechnical Design Manual, Table 17.2 psf = pounds per square foot
Luminaire and Accessory Structure Foundation Recommendations
The soils observed along the Duvall Avenue NE frontage varied and included loose fill, medium
dense recessional outwash, and dense to very dense lodgement till. The estimated standard
penetration resistance at these locations varied. We recommend using the following allowable
lateral bearing pressures for the noted locations, based on Table 17.2 of the WSDOT Geotechnical
Design Manual and estimated SPT N-Values. Foundations for luminaires should be designed and
constructed in accordance with WSDOT Standard Plan J-28.30-03. Foundations for smaller
accessory poles should be designed in accordance with WSDOT Standard Plan J-21.10-04:
Recommended Lateral Bearing Capacity
Arterial Luminaire Foundations
Duvall Avenue NE Frontage
Approximate Station AESI Exploration Recommended Allowable Lateral Bearing Pressure (psf)*
26+50 EB-21 2,500
24+75 EB-22 2,500
23+00 EB-23 1,000
21+25 EB-24 1,000
19+75 EB-25 1,000
18+25 EB-26 1,000
* Washington State Department of Transportation Geotechnical Design Manual, Table 17.2
psf = pounds per square foot
CONSTRUCTION RECOMMENDATIONS
The contractor should be prepared to address groundwater seepage encountered during
construction of foundation for mast arm poles, luminaires, and accessory frontage improvement
structures. Temporary casing, pumped sumps, and the use of tremie methods to place concrete
may be required. The need for control of groundwater seepage will vary depending on season
and weather conditions at the time of construction.
Renton School District Elementary School #16 Geotechnical Recommendations Addendum Report
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May 18, 2022 ASSOCIATED EARTH SCIENCES, INC.
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We also recommend that AESI be allowed to observe installation of foundations for frontage
improvement items included in this report to confirm that subsurface conditions encountered at
the time of construction are consistent with our observations during the design phase.
CLOSURE
We have enjoyed working with you on this study and are confident that these recommendations
will aid in the successful completion of your project. If you should have any questions or require
further assistance, please do not hesitate to call.
Sincerely,
ASSOCIATED EARTH SCIENCES, INC.
Kirkland, Washington
______________________________
Joshua S. P. Greer, L.G.
Senior Staff Geologist
______________________________
Bruce W. Guenzler, L.E.G. Kurt D. Merriman, P.E.
Senior Associate Geologist Senior Principal Engineer
Attachments: Figure 1: Vicinity Map
Figure 2: Site and Exploration Plan
Appendix A: Exploration Logs
DATA SOURCES / REFERENCES:
USGS: 7.5' SERIES TOPOGRAPHIC MAPS, ESRI/I-CUBED/NGS 2013
KING CO: STREETS, CITY LIMITS, PARCELS, PARKS 3/20
LOCATIONS AND DISTANCES SHOWN ARE APPROXIMATE
VICINITY MAP
RENTON SD ELEMENTARY NO. 16
RENTON, WASHINGTON
20180398E002 11/20 1
KING COUNTY
KING COUNTY
KING COUNTY
NEWCASTLE
RENTON
McKnight
Middle
School
Sierra Heights
Elementary
School
Highlands
Elementary
School Renton
Technical
College
Honey
Dew
Elementary School
Maplewood Heights
Elementary School
Hazen High
School
Apollo
Elementary
School
May Valley
Park
Maplewood
Park
Maplewood
Park
May CreekParkMay Creek
Park
May Creek
Park
Cougar
Mountain
Regional
Wildland Park
0 2000
Feet
PROJ NO.
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EB-2
EB-3
EB-4
EB-5
EB-6
EB-7
EB-8
EB-9
EB-10
EB-11
EB-12
EB-13
EB-14
EB-15
EB-16
EB-17
EB-18
EB-19
EB-20
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0 150
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DATA SOURCES / REFERENCES:
KING CO: STREETS, PARCELS, 9/21
AERIAL PICTOMETRY INT. 2021
LOCATIONS AND DISTANCES SHOWN ARE APPROXIMATE
20180398E002 5/22 2
EXISTING SITE AND
EXPLORATION PLAN
RENTON SD ELEMENTARY NO. 16
RENTON, WASHINGTON
LEGEND
SITE
VACUUM ASSISTED BORING, 2022
!(EXPLORATION BORING, 2022
GEOPROBE, 2021
!(EXPLORATION BORING, 2020
!(EXPLORATION BORING, 2019
!(EXPLORATION BORING, 2018
GP1
APPENDIX A
Exploration Logs
Grass / Topsoil
Vashon Lodgement Till
Moist, gray with some oxidation, very silty, gravelly, fine to medium SAND;unsorted (SM).
Becomes gray.
No recovery due to rock.
S-1
S-2
S-3
142850
3550/3"
50/1"
Bottom of exploration boring at 12.6 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~426
5
10
15
20
EB-1
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202278
5050/3"
5050/1"
Grass / Topsoil
Vashon Lodgement Till
Moist, oxidized gray, very silty, gravelly, fine to medium SAND; unsorted(SM).
Becomes gray.
Becomes very moist.
S-1
S-2
S-3
194240
2250/6"
382938
Bottom of exploration boring at 14 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~422
5
10
15
20
EB-2
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202282
5050/6"
67
Grass / Topsoil
Fill
Slightly moist to dry, brown to dark brown, very silty, fine SAND, tracegravel, trace charcoal and other organics (SM).
Moist, grayish brown, silty, fine to medium SAND, some gravel (SM).
Vashon Lodgement Till
Driller notes hard drilling at 7 feet.
Moist, gray, very silty, fine to medium SAND, some gravel; unsorted (SM).
Moist, oxidized gray, very silty, fine SAND, trace gravel; unsorted (SM).
S-1
S-2
S-3
435
50/6"
202640
Bottom of exploration boring at 14 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~414
5
10
15
20
EB-3
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202288
5050/6"
66
Grass / Topsoil
Fill
Moist, oxidized gray, very silty, fine to medium SAND, some gravel, tracecharcoal (SM).
Vashon Lodgement Till
Driller notes hard drilling at 7 feet.
Moist, gray, very silty, fine to medium SAND, some gravel; unsorted (SM).
As above.
S-1
S-2
S-3
8914
131517
222226
Bottom of exploration boring at 14 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~429
5
10
15
20
EB-4
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20222323
3232
4848
Grass / Topsoil
Vashon Lodgement Till
Slightly moist, oxidized gray, very silty, fine SAND, some gravel; unsorted(SM).
Becomes moist to very moist, gray.
Becomes moist.
S-1
S-2
S-3
161920
131717
182533
Bottom of exploration boring at 14 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~434
5
10
15
20
EB-5
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20223939
3434
58
Grass / Topsoil
Vashon Lodgement Till
Moist to very moist, gray with some oxidation, very silty, fine to mediumSAND, some gravel; unsorted (SM).
Contains trace to some coarse sand (SM).
S-1
S-2
71012
2350/4"
Bottom of exploration boring at 10.8 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~435
5
10
15
20
EB-6
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20222222
5050/4"
Grass / Topsoil
Vashon Lodgement Till
Moist, gray, silty, gravelly, fine to medium SAND; unsorted (SM).
As above.
S-1
S-2
193432
101931
Bottom of exploration boring at 11.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~433
5
10
15
20
EB-7
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202266
3364
Grass / Topsoil
Vashon Lodgement Till
Moist, gray, very silty, fine to medium SAND, some gravel; unsorted (SM).
Poor recovery due to gravel.
S-1
S-2
50/4"
50/1"
Bottom of exploration boring at 10.1 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 5 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~414
5
10
15
20
EB-8
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"CJK
DV2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
8/22/18,8/22/18
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill / Mini Track
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20225050/4"
5050/1"
Sod / Topsoil - ~4 inches
Vashon Lodgement TillMoist, orangish brown, silty, fine SAND, trace gravel; frequent organics(charcoal/rootlets) (SM).
Moist, orangish gray to brownish gray, silty, fine SAND, trace gravel;unsorted; diamict-like appearance; occasional organics (rootlets) (SM).
Moist, brownish gray, silty, fine SAND, trace gravel; rare organics; gravelsare subrounded, some broken; unsorted; diamict-like appearance (SM).
Driller notes hard drilling.
Moist, gray, silty, fine SAND, trace gravel; gravels are fine and subrounded;unsorted; diamict-like appearance (SM).
S-1
S-2
S-3
S-4
232
121822
141828
50/6"
Bottom of exploration boring at 10.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~436
5
10
15
20
EB-9
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202255
4040
4646
5050/6"
Sod / Topsoil - 4 inches
Fill / DuffMoist, orangish gray, silty, fine SAND, trace gravel; occasional organics(charcoal/rootlets); unsorted (SM).
Vashon Recessional Outwash
Slightly moist, brownish gray, fine SAND, some silt, trace gravel;occasional organics (charcoal/roots) (SP-SM).
Vashon Lodgement Till
Slightly moist, brownish gray, fine SAND, some silt, trace gravel; rareorganics (rootlets); unsorted (SP-SM).
Hard drilling/rig chatter at 9 feet.
Moist, brownish gray, fine to medium SAND, some silt to silty, trace gravel;weakly stratified zones of silty sand, unsorted, diamict-like and mediumsand, some silt (SM/SP-SM).
Hard drilling/rig chatter at 12 feet.
Moist to very moist, fine to medium SAND, some silt to silty, trace gravel;gravels are subrounded; faintly gradationally stratified (SP-SM/SM).
S-1
S-2
S-3
S-4
S-5
456
2310
4050/6"
192050/5"
50/5"
Bottom of exploration boring at 15.4 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~431
5
10
15
20
EB-10
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20221111
1313
90
5050/5"
5050/5"
Sod / Topsoil - 4 inches
Forest DuffMoist, orangish brown, silty, fine SAND, trace gravel; frequent organics(charcoal/rootlets) (SM).
Vashon Recessional Outwash
Moist, brownish gray with bands of iron oxide staining, fine to mediumSAND, some silt, trace gravel; rare organics (roots); gradationally stratified(SP-SM).
As above; gradationally stratified (SP-SM).
Vashon Lodgement Till
Hard drilling/rig chatter at 7 feet.
Moist, gray, silty, fine SAND, some gravel, some medium to coarse sand;unsorted; diamict-like appearance (SM).
Hard drilling/rig chatter at 13 feet.
As above; gravels are fine to coarse, broken, and weathered; unsorted;diamict-like appearance (SM).
S-1
S-2
S-3
S-4
S-5
221
5810
9910
2850/6"
4050/5"
Bottom of exploration boring at 15.9 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~409
5
10
15
20
EB-11
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202233
1818
1919
78
5050/5"
Fill
Moist, light brown to dark brown, silty, fine SAND, some gravel; abundantorganics (rootlets/wood debris); poor recovery (SM).
Vashon Lodgement Till
Slightly moist to moist, brownish gray with mottled iron oxide staining, silty,fine SAND, some gravel; gravels are fine to coarse, weathered, andbroken; unsorted; diamict-like appearance (SM).
As above; less iron oxide mottling; some coarse sand; broken gravelsthroughout (SM).
Hard drilling/rig chatter at 7 feet.
Slightly moist, brownish gray, silty, fine SAND, some gravel; section (~2inches thick) of broken gravel (SM).
Hard drilling at 11.5 feet.
Rig chatter at 12.5 feet.
Moist, brownish gray, silty, fine SAND, some gravel; broken gravelthroughout; unsorted; diamict like (SM).
S-1
S-2
S-3
S-4
S-5
345
132940
222948
4050/4"
50/3"
Bottom of exploration boring at 15.3 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~425
5
10
15
20
EB-12
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202299
69
77
5050/4"
5050/3"
Fill
Moist, orangish brown to dark brown, silty, fine to medium SAND, somegravel; frequent organics (charcoal/rootlets) (SM).
Upper 6 inches: very moist, brown to grayish brown, silty, fine to mediumSAND, some gravel (SM).
Vashon Lodgement Till
Lower 6 inches: moist, brownish gray with bands of iron oxide staining,silty, fine SAND, trace to some gravel; unsorted; diamict-like (SM),
Upper 6 inches: as above (SM).
Lower 6 inches: becomes moist, gray to greenish gray, silty, fine SAND,some gravel; gravels are fine to coarse, weathered, and broken (SM).
Upper 4 inches: as above; moderate to strong organic/petrochemical odor(SM).Moist, brownish gray with mottled iron oxide staining, silty, medium SAND,some gravel, some purple gravel (rhyolite?); unsorted; diamict-like (SM).
Hard drilling/rig chatter at 12.5 feet.
Moist, brownish gray, silty, fine to medium SAND, some gravel; unsorted;diamict-like appearance; gravels are subrounded, some broken, andweathered (SM).
Upper 6 in: moist, brownish gray, interbedded silty, fine SAND (SM) andmedium SAND, trace silt (SP).
At 20.5 ft: Vashon Lodgement Till / Vashon Advance Outwash ? - Lower6 in: moist to very moist, brownish gray, fine to medium SAND, some silt,trace gravel (SP-SM); moderately bedded with occasional interbeds (~1/2inch thick) of silty fine sand (SM).
S-1
S-2
S-3
S-4
S-5
S-6
321
2915
81116
101516
50/6"
4050/5"
Bottom of exploration boring at 20.9 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~424
5
10
15
20
EB-13
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202233
2424
2727
3131
5050/6"
5050/5"
Sod / Topsoil - 4 inches
FillMoist, orangish brown, silty, fine SAND, trace gravel; frequent organics(charcoal/rootlets) (SM).
Vashon Lodgement Till
Slightly moist, brownish gray with mottled iron oxide staining, silty, fineSAND, some gravel; massive; unsorted; gravels are fine to coarse, broken,and weathered (SM).
Hard drilling at 4 feet.
Moist, brownish gray with mottled iron oxide staining, silty, fine SAND,some gravel; unsorted; diamict-like; gravels are broken and weathered(SM).
Slightly moist to moist, brownish gray, silty, fine to medium SAND, somegravel; gravels are broken and weathered; section (~2 inches thick) ofbroken gravel; less silt and moisture with depth (SM).Hard drilling/rig chatter at 11 feet.
Moist, brownish gray, silty, fine to medium SAND, trace to some gravel;gravels are broken throughout; unsorted; diamict-like appearance (SM).
Hard drilling/rig chatter at 16 feet.
Upper 5 inches: moist, brownish gray, silty, fine SAND, trace gravel;unsorted; diamict-like (SM).
At 20.4 ft: Vashon Advance Outwash / Vashon Lodgement Till ? -Becomes moist to very moist, brownish gray, interbedded, silty, fine SAND(SM) and fine to medium SAND, some silt (SP-SM); moderatelybedded in layers (~1/2 inch thick); higher moisture in less silty interbeds.
S-1
S-2
S-3
S-4
S-5
S-6
322
102022
91523
4050/4"
50/6"
171340
Bottom of exploration boring at 21.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~421
5
10
15
20
EB-14
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
ALG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
9/27/19,9/27/19
Logged by:
Shelby Tube Sample
140# / 30"Boretec / Rubber-Track Volvo EC55C HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202244
4242
3838
5050/4"
5050/6"
53
Topsoil - 6 inchesMoist, dark brown, sandy, SILT; frequent rootlets/organics (ML).
FillLower 6 inches: moist, orangish brown with moderate oxidation, mostly fineto medium SAND, some silt; occasional mica, charcoal, and rootlets;discontinuous lens of dark brown, sandy, silt (SP-ML).
Upper 6 inches: as above; becomes heavily oxidized; silty; moderate fineorganics/rootlets (SM).Lower 12 inches: moist, grayish brown with slight to moderate oxidationstaining, silty, fine SAND, some gravel; one broken gravel in sampler;unsorted (SM).
Moist to very moist, brownish gray, silty, fine SAND, some gravel; scatteredclasts of brown, sandy, silt with moderate oxidation; unsorted (SM-ML).
Vashon Lodgement TillIncreased drilling difficulty at 6.5 feet.
Moist, brownish gray with slight oxidation, silty, fine to medium SAND,some gravel; becomes very moist within sandier zones; unsorted (SM).
As above; moist.
As above.
S-1
S-2
S-3
S-4
S-5
S-6
344
41513
568
34150/3"
274750/5"
151732
Bottom of exploration boring at 16.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~433
5
10
15
20
EB-15
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202288
2828
1414
5050/3"
5050/5"
4949
Topsoil - 12 inchesMoist to very moist, dark brown,sandy, SILT; frequent fine organic debris,roots, and rootlets (ML).
Vashon Lodgement TillLower 12 inches: moist, brown with moderate oxidation, silty, fine SAND,trace gravel; occasional rootlets (SM).Grinding and increased drilling difficulty at 2 feet.Moist, grayish brown with slight oxidation, silty, fine to medium SAND,some gravel to gravelly; contains sandier zones; unsorted (SM).
As above; becomes brownish gray; lack of sandier zones; blowcounts areslightly overstated (SM).Bouncing on rock at 5 feet.
Moist, brownish gray, silty, fine to medium SAND, some gravel; unsorted(SM).
As above.
S-1
S-2
S-3
S-4
S-5
4514
51018
154135
4150/5"
50/6"
Bottom of exploration boring at 10.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~428
5
10
15
20
EB-16
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20221919
2828
76
5050/5"
5050/6"
Topsoil - 6 inches
Vashon Lodgement TillLower 6 inches: moist, brown with moderate to heavy oxidation, silty, fineto medium SAND, trace gravel; moderate rootlets/charcoal (SM).Drilling difficulty and grinding increases at 1.5 feet.
Moist, grayish brown with slight to moderate oxidation, silty, fine to mediumSAND, trace gravel; unsorted (SM).
Drilling difficulty increases.
Moist, brownish gray with slight oxidation, silty, fine to medium SAND,some gravel; unsorted; broken gravel within sampler; blowcounts areslightly overstated (SM).
As above.
As above; poor recovery; bouncing on rock; blowcounts overstated.
As above; broken gravel within sampler; blowcounts slightly overstated.
S-1
S-2
S-3
S-4
S-5
S-6
345
101817
113848
223234
50/3"
503636
Bottom of exploration boring at 16.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~428
5
10
15
20
EB-17
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202299
2525
86
66
5050/3"
72
Topsoil - 6 inches
FillLower 6 inches: moist, brown with slight oxidation, silty, fine SAND;occasional rootlets/charcoal (SM).
Upper 6 inches: as above (SM).
Vashon Lodgement TillLower 12 inches: moist, grayish brown, silty, fine to medium SAND, tracegravel; occasional rootlets; unsorted (SM).
Drilling difficulty increases at 4.5 feet.
Moist, brownish gray with slight oxidation, silty, fine to medium SAND,some gravel; broken gravel within sampler; unsorted (SM).
As above; lack of slight oxidation (SM).
As above; pounding on rock; blowcounts overstated.
As above; contains sandier zones; ranges to very moist within sandierzones.
S-1
S-2
S-3
S-4
S-5
S-6
345
111336
192131
124450/5"
4350/5"
1550/5"
Bottom of exploration boring at 16 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~431
5
10
15
20
EB-18
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202299
4949
52
5050/5"
5050/5"
5050/5"
Topsoil - 2 inches
FillLower 10 inches: moist, brown, silty, fine to medium SAND, some gravel;moderate rootlets/fine organic debris/charcoal; chaotic structure (SM).
As above; poor recovery/brick debris (SM).
Upper 6 inches: as above.
Vashon Lodgement TillLower 12 inches: moist, grayish light brown with slight oxidation, silty, fineto medium SAND, some gravel; broken gravel within sampler; unsorted(SM).
Moist, brownish gray, silty, fine to medium SAND, some gravel; brokengravel within sampler; unsorted (SM).
As above.
S-1
S-2
S-3
S-4
S-5
358
4410
31850/6"
172850/6"
3650/6"
Bottom of exploration boring at 11 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~430
5
10
15
20
EB-19
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20221313
1414
5050/6"
5050/6"
5050/6"
Topsoil - 2 inches
FillLower 10 inches: moist, brown to dark brown with moderate oxidation, silty,fine to medium SAND; moderate roots, rootlets, and charcoal; chaoticstructure (SM).
Vashon Lodgement Till
Moist, grayish brown with moderate oxidation staining, silty, fine SAND;unsorted (SM).
Increased drilling difficulty.
Moist, grayish brown with slight oxidation, silty, fine to medium SAND,some gravel; unsorted (SM).
Moist, brownish gray, silty, fine to medium SAND, some gravel; unsorted(SM).
No recovery; bouncing on rock.
S-1
S-2
S-3
S-4
S-5
222
5119
81118
484150/6"
50/3"
Bottom of exploration boring at 10.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 8 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~434
5
10
15
20
EB-20
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
CRC2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
10/6/20,10/6/20
Logged by:
Shelby Tube Sample
140# / 30"Advance Drill Tech / D50 Mobile Track Rig
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202244
2020
2929
5050/6"
5050/3"
Grass / Topsoil - 8 inches
Vashon Lodgement Till
Very moist at top to moist at tip, gray, silty, fine SAND, some gravel;unsorted (SM).
As above; moist.
As above.
S-1
S-2
S-3
243850/3"
3050/4"
50/3"
Bottom of exploration boring at 8 feetGroundwater encountered 0 to 3 feet.0 to 2.5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~425
5
10
15
20
EB-21
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20225050/3"
5050/4"
5050/3"
Grass / Topsoil - 8 inches
Vashon Lodgement Till
Very moist to moist at tip, brownish gray, silty, fine SAND, some gravel;unsorted (SM).
As above.
As above; poor recovery; driller notes sampling on gravel.
S-1
S-2
S-3
21718
61116
50/4"
Bottom of exploration boring at 15.3 feetGroundwater encountered 2 to 5 feet.0 to 5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~429
5
10
15
20
EB-22
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20223535
2727
5050/4"
Topsoil - 8 inches
Fill
Saturated due to seepage from above.
Wet, gray to brown, silty, fine SAND, trace gravel (SM).
Vashon Lodgement TillIncrease in drilling action.
Moist, gray, silty, fine SAND, some gravel; unsorted (SM).
S-1
S-2
122
202750/3"
Bottom of exploration boring at 11.3 feetGroundwater encountered 1 to 6.5 feet.0 to 5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~433
5
10
15
20
EB-23
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 202244
5050/3"
Topsoil - 8 inches
Fill
Loose to medium dense, very moist, brown, silty, gravelly, fine SAND,trace organics (SM).
Wet, brown, silty, fine SAND, trace gravel, trace organics (SM).
Slow drilling, high drill action.
Vashon Lodgement Till
Moist, gray, silty, fine SAND, some gravel; unsorted (SM).
S-1
S-2
S-3
456
3450/5"
Bottom of exploration boring at 11 feetGroundwater encountered 5 to7.5 feet.0 to 5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~435
5
10
15
20
EB-24
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20221111
5050/5"
Topsoil - 8 inches
Vashon Recessional Outwash
Medium dense, moist, orangish brown, SAND, some gravel, some silt;stratified (SP-SM).
Slow drill progress.
Upper 6 inches: as above; wet.
Vashon Lodgement TillMoist, brownish gray, silty, fine SAND, some gravel; unsorted (SM).
As above.
Becomes gray.
S-1
S-2
S-3
S-4
3250/6"
3150/4"
50/6"
Bottom of exploration boring at 13 feetGroundwater encountered 2 to 7.5 feet.0 to 5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~436
5
10
15
20
EB-25
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20225050/6"
5050/4"
5050/6"
Grass / Topsoil - 8 inches
Fill
Loose, moist, brown, silty, fine SAND, trace gravel, trace organics (SM).
Conduit PVC pipe (4-inch diameter) in eastern sidewall.
High drill action at 5 feet.
Vashon Lodgement Till
Moist, brownish gray, silty, fine SAND, some gravel; unsorted (SM).
As above.
As above.
S-1
S-2
S-3
S-4
172424
172645
334948
Bottom of exploration boring at 15.5 feetGroundwater encountered 1 to 5 feet.0 to 5 feet excavated using Vac-Truck.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~438
5
10
15
20
EB-26
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/4/22,4/4/22
Logged by:
Shelby Tube Sample
140# / 30"Geologic Drill Partners / Mini Bobcat HSA
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 20224848
71
97
Topsoil - 8 inches
Vashon Lodgement Till
Medium dense, moist, brownish gray, fine SAND, some silt to silty, tracegravel; unsorted (SM).
Becomes dense to very dense; excavates in clasts.
S-1
S-2
S-3
Bottom of exploration boring at 7.5 feetNo groundwater encountered.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~437
5
VB-1
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/5/22,4/5/22
Logged by:
Shelby Tube Sample
140# / 30"APS / Vacuum Truck
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 2022
Topsoil
Vashon Lodgement Till
Medium dense to dense, moist, gray, silty, fine SAND, some gravel;unsorted (SM).
Difficult air knife excavation.
S-1
S-2
Bottom of exploration boring at 7 feetDiscontinuous slight groundwater seepage 1 to 4 feet.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~438
5
VB-2
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/5/22,4/5/22
Logged by:
Shelby Tube Sample
140# / 30"APS / Vacuum Truck
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 2022
Topsoil - 8 inches
Fill
Medium dense, moist to wet, brownish gray, silty, fine SAND, some gravel(SM).
Trace rootlets and cobbles at 5.5 feet.
Vashon Lodgement TillBecomes dense to very dense, moist, gray, silty, fine SAND, some gravel;unsorted (SM). Difficult air knife.
S-1
S-2
S-3
Bottom of exploration boring at 7.5 feetGroundwater seepage encountered 2.5 to 5.5 feet.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~437
5
VB-3
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/5/22,4/5/22
Logged by:
Shelby Tube Sample
140# / 30"APS / Vacuum Truck
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 2022
Grass / Topsoil - 8 inches
Vashon Lodgement Till
Medium dense, very moist, mottled brownish gray, silty, fine SAND, tracegravel; occasional intact till clasts and rootlets (SM).
Becomes dense to very dense and moist; difficult air knife.
Trace cobbles.
S-1
S-2
Bottom of exploration boring at 7 feetGroundwater seepage encountered 2 to 4 feet.
Ground Surface Elevation (ft)
Grab SampleSymbol 6 inches
40
Datum
Hammer Weight/Drop
Sampler Type (ST):
~437
5
VB-4
Ring Sample
No RecoveryGraphic 10 Other TestsHole Diameter (in)
DESCRIPTION
Driller/Equipment
Blows/6"JHS
JG2" OD Split Spoon Sampler (SPT)
3" OD Split Spoon Sampler (D & M)Water LevelProject Name
Water Level ()Approved by:
30
Blows/Foot
SamplesDepth (ft)S
T
Exploration Number20180398E002
4/5/22,4/5/22
Logged by:
Shelby Tube Sample
140# / 30"APS / Vacuum Truck
Exploration Boring
Water Level at time of drilling (ATD)
Renton School District Elementary School No. 16
M - Moisture
Project Number
20
Renton, WA Date Start/Finish
CompletionLocation
Sheet1 of 1
NAVD 88
WellAESIBOR 20180398E002.GPJ May 11, 2022