HomeMy WebLinkAboutRS_Geotechnical_Report_251102_v1 Gary A. Flowers, PLLC
Geological & Geotechnical Consulting 5205 23rd Avenue W
Everett, WA 98203
Gary A. Flowers, PLLC.
5205 23rd Avenue W Everett, Washington 98203 206-819-4304
1
July 8, 2024
Project No. 24011
Xiao Lan Zhang
562 Graham Ave NE
Renton, WA 98059
Subject: Geotechnical Services Report - Infiltration
3607 NE 12th Street
Renton, Washington, 98056
This report summarizes the results of our geological and infiltration evaluation of the property
located at the above noted address in Renton, WA. The property was a portion of a larger parcel
that was divided into 2 separate lots (Parcel A and Parcel B) via a boundary line adjustment. Parcel
A has an address of 1157 Queen Ave NE and Parcel B has an address of 3607 NE 12th Street.
EXISTING CONDITIONS
The subject property (Parcel B, 3607 NE 12th Street) is rectangular shaped and measures about
210 feet in the north-south direction by 134 feet in the east-west direction. The property is flat
lying with a barely discernible downward slope from SE to NW. Overall relief is about 2 feet.
The site is currently developed with an old, single story house, detached garage, several
outbuildings and an asphalt driveway. The site is primarily vegetated with tall field grass, several
large and small deciduous and evergreen trees and some shrubs around the house. .
At the time of our study there was no evidence of standing or flowing water on the parcel.
Subsurface Exploration
In order to confirm subsurface conditions on the property a series of 3 exploration pits were
excavated on October 13, 2021. Logs of the exploration pits are attached with this report.
Generally, medium dense to very dense silty sand with gravel was observed on the site. This
sediment is interpreted to be Vashon age lodgement till. Lodgement till is a nonhomogeneous
mixture of sand and gravel in a silt/clay matrix. This material was deposited in front of the
advancing ice sheet on the order of 13,500 years ago and subsequently overrun by the ice which
is thought to have been in excess of 3,000 feet thick in this area. The result is a densely
consolidated soil with high strength and low permeability characteristics.
Zhang Property Geotechnical Services Report
3607 NE 12th Street, Renton, Washington
Gary A. Flowers, PLLC.
5205 23rd Avenue W Everett, Washington 98203 206-819-4304
2
Ground water seepage was not observed in any of the exploration pits and no caving conditions
were observed within the sidewalls of the exploration pits.
Although we had no access to Parcel B at the time of our field study, exploration pit EP-3 was
specifically placed adjacent to the boundary adjustment line in order to confirm that the lodgement
till sediments continued to the north and onto the subject property (Parcel B).
Mappings and Nearby Studies
According to the Geologic Map of King County, Washington, by Booth, Troost and Wisher, March
2007, the subject site is mapped as Vashon age glacial till (Qvt). Our explorations are in agreement
with the published geology map of the area.
A study performed for a small housing development at 3716 NE 12 Street, about 200 feet to the
east and just across NE 12th Street from the subject site, excavated 6 exploration pits and confirmed
the presence of glacial till soils and potential shallow perched water during the wetter season.
Infiltration of Storm Water
We understand that infiltration of storm water on-site was to be considered for the entire property.
Our previous subsurface explorations were located in order to encompass both potential building
sites should the short plat be granted.
In order to verify whether or not there was any infiltration potential within the observed sediments
an infiltration test was performed on the site.
Testing was completed in general accordance with City of Renton 2017 Storm Water Design
Manual and Reference 6-A for a small scale pilot infiltration test (PIT). The pit was excavated to
a depth of 3.1 feet and the bottom measured 4.7 feet long and 4.1 feet wide for a total area of 19.27
square feet. Presoaking and testing was completed using a garden hose running into a 4-foot long,
4-inch diameter, perforated, pvc pipe with a cap for a splash plate on the bottom end. The pvc
pipe was marked in half-inch increments as required. Water was then added to the pit for the pre-
soak period and maintained at a depth of 12 to 14 inches for 6 hours. It should be noted that little
to no water flow was required in order to maintain the water depth. In fact, at the lowest water
flow setting attainable with the available equipment the water level continued to rise throughout
the soak period. Following the pre-soak, the water flow was shut off to allow the water level to
adjust to the required 6-inch head. After 2 hours the water level had only reduced by less than 1
inch.
Due to the conditions detailed above, the constant head test was not performed. The falling head
test was then performed for an hour. During the falling head test the water level reduced by
approximately .5 inches in one hour even with a 12-inch head instead of a 6-inch head.
Zhang Property Geotechnical Services Report
3607 NE 12th Street, Renton, Washington
Gary A. Flowers, PLLC.
5205 23rd Avenue W Everett, Washington 98203 206-819-4304
3
Based on the results of our explorations on Parcel A, and the other study explorations across NE
12th Street that encountered glacial till sediments at shallow depth it is apparent that the subject
site is underlain by very dense, glacially consolidated sediments (glacial till) that forms an
impermeable layer at shallow depth. As such there is no adequate separation prior to encountering
the impermeable sediments and there is a potential for shallow groundwater atop the glacial till
sediments during the wet season. In addition, applying the measured infiltration rate for our
previous infiltration test on Parcel A and the required correction factors for testing, geometry and
plugging, it is our opinion that the design infiltration rate is nil, and no consideration should be
given to infiltration of storm water on this property. This is typical for sites that are underlain by
glacial till sediments.
SUMMARY
Our findings and recommendations provided in this report were prepared in accordance with
generally accepted principles of engineering geology and geotechnical engineering as practiced in
the Puget Sound area at the time this report was submitted. We make no other warranty, either
express or implied.
Thank you for the opportunity to be of service. Should you have any questions please do not
hesitate to contact our office.
Respectfully submitted,
Gary A. Flowers, P.G., P.E.G.
Principal Engineering Geologist
Attachments: Exploration Pit Logs
Site & Exploration Plan
Zhang Property Geotechnical Services Report
3607 NE 12th Street, Renton, Washington
Gary A. Flowers, PLLC.
5205 23rd Avenue W Everett, Washington 98203 206-819-4304
4
EXPLORATION PIT LOGS
1157 Queen Avenue NE & 3607 NE 12th Street
Renton, WA
EP-1 Approximate elevation 432 feet.
0.0’ – 1.0’ Loose, moist, grayish-black, silty SAND (topsoil) and grass sod
1.0’ – 2.5’ Medium dense, light brown, silty sand with gravel (glacial till) [SM]
2.5’ – 4.0’ Very dense, light brown, silty sand with gravel (glacial till) [SM]
Bottom of pit at 4.0 feet on 10/13/2021. No ground water. No caving.
EP-2 Approximate elevation 432 feet.
0.0’ – 1.0’ Loose, moist, grayish-black, silty SAND (topsoil) and grass sod
1.0’ – 2.5’ Medium dense, light brown, silty sand with gravel (glacial till) [SM]
2.5’ – 4.0’ Very dense, light brown, silty sand with gravel (glacial till) [SM]
Bottom of pit at 4.0 feet on 10/13/2021. No ground water. No caving.
EP-3 Adjacent to Parcel B boundary adjustment line. Approximate elevation 431 feet.
0.0’ – 1.0’ Loose, moist, grayish-black, silty SAND (topsoil) and grass sod
1.0’ – 2.5’ Medium dense, light brown, silty sand with gravel (glacial till) [SM]
2.5’ – 4.0’ Very dense, light brown, silty sand with gravel (glacial till) [SM]
Bottom of pit at 4.0 feet on 10/13/2021. No ground water. No caving.
IP-1 Approximate elevation 430 feet
0.0’ – 1.0’ Loose, moist, grayish-black, silty SAND (topsoil) and grass sod
1.0’ – 2.5’ Medium dense, light brown, silty sand with gravel (glacial till) [SM]
2.5’ – 3.1’ Very dense, light brown, silty sand with gravel (glacial till) [SM]
Bottom of pit at 4.0 feet on 10/13/2021. No ground water. No caving.
30
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TREE CANOPY/DRIP LINE
FENCE LINE (TYPE AS NOTED)x
BUILDING LINE
TELEPHONE RISERTJR
MONUMENT (FOUND AS NOTED)
SIGN
DECIDUOUS TREE
CONIFEROUS TREE
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FIRE HYDRANT
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POST OR BOLLARD
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LEGEND
(C)
(M)
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CALCULATED DIMENSION
MEASURED DIMENSION
PROPERTY LINE
CHAIN LINK FENCE
WATER LINE PER RECORD DATAW(D)
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FOUND 1/2"
REBAR AND CAP
AT GRADE
"MHT 9470"
E. 0.1'
09-02-21
FOUND 1/2" REBAR AND
CAP IN 5" X 5" CONC
"MHT 9470"
E. 0.1'
09-02-21
FOUND BARE 1/4"
REBAR
W. 0.5'
09-02-21
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PARCEL A
KING COUNTY BOUNDARY
LINE ADJUSTMENT
REC.NO. 9802099012
SSMH
TOP 432.03
IE 427.63 (8" PVC (OUT-N)
BOTTOM STRUCTURE
ELEV. 427.66
NO CHANNEL
SSMH
TOP 434.25
8" PVC (W), 8" CONC (N),
8" CONC (S)
CENTER CHANNEL
ELEV. 425.43
CATCH BASIN
TOP 433.33
6" CONC IE 432.30 (IN-W)
8" CMP IE 431.28 (OUT-S)
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TOP REBAR/CAP
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N87°59'50"W 134.14'(C) 134.13'(R1)
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FENCE 0.1' S. OF P/LFENCE 0.2' S. OF P/L
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TOP REBAR/CAP
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4.8'
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TOP 433.61
6" CONC IE 432.30 (OUT-E)
SSSS ~
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Save Date:
Plot Date:
9/21/2021 2:46 PM
9/24/2021 10:35 AM
By: Arj P:\O\OWDV01880001\0400CAD\SV\BASES\SV-TP-OWDV01880001.dwg
Aaron JenningsBy:
File:
POR. NW 1/4, NE 1/4, SEC. 9, TWP. 23 N., RGE. 5 E., W.M.
TOPOGRAPHIC SURVEY
FOR
SHUM PROPERTY
HOI-FUNG SHUM
17723 110TH PLACE SE, RENTON, WA 98055
SE
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®
20300 Woodinville Snohomish Rd. NE, Ste A
Woodinville Washington 98072
Phone: 425.415.2000
NORTH
1. INSTRUMENTATION FOR THIS SURVEY WAS A TRIMBLE
TOTAL STATION. PROCEDURES USED IN THIS SURVEY WERE
FIELD TRAVERSE, MEETING OR EXCEEDING STANDARDS SET
BY WAC 332-130-090.
2. PRIMARY CONTROL POINTS AND ACCESSIBLE MONUMENT
POSITIONS WERE FIELD MEASURED UTILIZING GLOBAL
POSITIONING SYSTEM (GPS) SURVEY TECHNIQUES USING
TRIMBLE EQUIPMENT. MONUMENT POSITIONS THAT WERE
NOT DIRECTLY OBSERVED USING GPS SURVEY TECHNIQUES
WERE TIED INTO THE CONTROL POINTS UTILIZING TRIMBLE
ELECTRONIC TOTAL STATIONS FOR THE MEASUREMENT OF
BOTH ANGLES AND DISTANCES. THIS SURVEY MEETS OR
EXCEEDS THE STANDARDS SET BY WAC 332-130-090.
3. THE INFORMATION DEPICTED ON THIS MAP REPRESENTS
THE RESULTS OF A SURVEY MADE ON SEPTEMBER 3, 2021
AND CAN ONLY BE CONSIDERED AS INDICATING THE
GENERAL CONDITION EXISTING AT THAT TIME.
4. NO EASEMENTS, RESTRICTIONS OR RESERVATION OF
RECORD WHICH WOULD BE DISCLOSED BY TITLE REPORT
ARE SHOWN.
5. CONTOUR INTERVAL: 2 FOOT
PARCEL A OF KING COUNTY BOUNDARY LINE
ADJUSTMENT, RECORDED UNDER RECORDING NO.
9802099012, RECORDS OF KING COUNTY, WASHINGTON.
NAVD 88
BASED ON GPS OBSERVATIONS.
SITE BENCH MARKS:
TBM 1: TOP OF REBAR AND CAP, SET IN ASPH DRIVE,
46'± SW OF SW CORNER OF SUBJECT PROPERTY ON SITE AS SHOWN
ELEVATION = 434.36'
TBM 2: TOP OF REBAR AND CAP, SET IN MIDDLE OF SUBJECT
PROPERTY AS SHOWN
ELEVATION = 430.64'
EROF
GI
E OY
D
U
Call: TOLL FREE
1-800-424-5555
C
LLA
B CALL BEFORE YOU DIG
1. KING COUNTY BOUNDARY LINE ADJUSTMENT,
RECORDED UNDER RECORDING NO. 9802099012,
RECORDS OF KING COUNTY, WASHINGTON.
09-24-21
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TJR
8"DEC(2)
FOUND 1/2" REBAR AND
CAP AT GRADE
"MHT 9470"
E. 0.1'
09-02-21 FOUND 1/2" REBAR AND
CAP IN 5" X 5" CONC
"MHT 9470"
E. 0.1'
09-02-21
x
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EXTRUDED CURB
EXTRUDED CURB
STOP SIGN
SPEED SIGN
SIGN
"DEAD END"
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CULVERT
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IE 428.96'
FOG LINE
FOG LINE
OP OP OP OP OP OP OP OP OP OP OP OP OP OP OP OP OP OP
OP OP OP OP
SINGLE STORY
WOOD HOUSE
WOOD GARAGE
SHED ON
CONC SLAB
TREE CANOPY
LINE (TYP)
TREE CANOPY
LINE (TYP)
TREE CANOPY
LINE (TYP)
CHIMNEY
SHED
432
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~
N87°59'46"W 2,625.71'(M)(R1)
~
~
1,506.81'(C)(R1)
134.07'(C)(R1)
PARCEL B
KING COUNTY BOUNDARY
LINE ADJUSTMENT
REC.NO. 9802099012
PARCEL A
CATCH BASIN
TOP 430.37
12" CONC IE 427.29 (OUT-W)
12" CONC IE 427.34 (IN-S)
CATCH BASIN
TOP 429.84
12" ADS IE 428.12 (OUT-W)
12" ADS IE 428.16 (IN-E)
SSMH
TOP 430.09
8" CONC (W), 18" PVC (SE),
8" CONC (S)
CENTER CHANNEL ELEV. 424.53
SDMH
TOP 430.15
12" CONC IE 427.69 ( OUT-N)
12" CONC IE 427.85 (OUT-W)
12" CONC IE 427.90 (IN-E)
CATCH BASIN
TOP 429.80
12" CMP IE 428.11 (OUT-W)
12" CMP IE 428.13 (IN-SE)
DITCH
SSMH
TOP 430.12
8" PVC (NW), 8" PVC (E),
CENTER CHANNEL ELEV. 424.92
SSMH
TOP 434.30
8" PVC (W), 8" PVC (S)
CENTER CHANNEL
ELEV. 425.89
SS
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SS~SD SD SD SD SD
SD
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TBM 1
TOP REBAR/CAP
EL = 430.40'
TBM 2
TOP REBAR/CAP
EL = 430.29'
429
.
7
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9
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9
S0
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°
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'
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"
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'
N87°59'50"W 134.14'
N87°59'46"W 134.08'
FENCE 0.3'
E. OF P/L
FENCE 0.2'
W. OF P/L
FENCE 0.3'
W. OF P/L
FENCE 0.5'
W. OF P/L
1.5'
2.5'
FF ELEV. 432.76'
FF ELEV. 431.47'
FF ELEV. 430.30'
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SSSS ~
SSSS ~
FOUND PUNCH ON
1 1/2" BRASS DISK IN
IN CASE
DOWN 0.7'
08-30-21
UN
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FOUND 1/8" PIN
IN CONC
MON IN CASE
DOWN 1.5'
08-30-21
805.92'(C)(R1)
MO
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CONC MON IN CASE
DOWN 2.1'
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178.92'(M)
TREE CANOPY/DRIP LINE
FENCE LINE (TYPE AS NOTED)x
BUILDING LINE
MONUMENT (FOUND AS NOTED)
SIGN
DECIDUOUS TREE
CONIFEROUS TREE
WATER VALVE
FIRE HYDRANT
HOSE BIB
STORM DRAIN MANHOLE
STORM CATCH BASIN
SEWER MANHOLE
POWER POLE/LIGHT POLE
GUY ANCHOR
GAS METER
S
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GM
WV
POWER OVERHEAD LINEOP
SANITARY SEWER PIPESS
STORM DRAIN PIPESD
CONCRETE PAVING
ASPHALT PAVING
REBAR (FOUND AS NOTED)
POST OR BOLLARD
GAS VALVEGV
F FIR TREE
M MAPLE
TREE LEGEND
LEGEND
WATER LINE PER RECORD DATAW(D)
(C)
(M)
P/L
CLF
CALCULATED DIMENSION
MEASURED DIMENSION
PROPERTY LINE
CHAIN LINK FENCE
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Save Date:
Plot Date:
9/24/2021 9:48 AM
9/24/2021 10:36 AM
By: Arj P:\O\OWDV01890001\0400CAD\SV\BASES\SV-TP-OWDV01890001.dwg
Aaron JenningsBy:
File:
POR. NW 1/4, NE 1/4, SEC. 9, TWP. 23 N., RGE. 5 E., W.M.
TOPOGRAPHIC SURVEY
FOR
ZHANG PROPERTY
XIAO-LAN ZHANG
17723 110TH PLACE SE, RENTON, WA 98055
SE
P
T
E
M
B
E
R
2
4
,
2
0
2
1
AR
J
1"
=
1
0
'
OW
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1
8
9
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0
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0
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1
1
1
®
20300 Woodinville Snohomish Rd. NE, Ste A
Woodinville Washington 98072
Phone: 425.415.2000
NORTH
1. INSTRUMENTATION FOR THIS SURVEY WAS A TRIMBLE
TOTAL STATION. PROCEDURES USED IN THIS SURVEY WERE
FIELD TRAVERSE, MEETING OR EXCEEDING STANDARDS SET
BY WAC 332-130-090.
2. PRIMARY CONTROL POINTS AND ACCESSIBLE MONUMENT
POSITIONS WERE FIELD MEASURED UTILIZING GLOBAL
POSITIONING SYSTEM (GPS) SURVEY TECHNIQUES USING
TRIMBLE EQUIPMENT. MONUMENT POSITIONS THAT WERE
NOT DIRECTLY OBSERVED USING GPS SURVEY TECHNIQUES
WERE TIED INTO THE CONTROL POINTS UTILIZING TRIMBLE
ELECTRONIC TOTAL STATIONS FOR THE MEASUREMENT OF
BOTH ANGLES AND DISTANCES. THIS SURVEY MEETS OR
EXCEEDS THE STANDARDS SET BY WAC 332-130-090.
3. THE INFORMATION DEPICTED ON THIS MAP REPRESENTS
THE RESULTS OF A SURVEY MADE ON SEPTEMBER 3, 2021
AND CAN ONLY BE CONSIDERED AS INDICATING THE
GENERAL CONDITION EXISTING AT THAT TIME.
4. NO EASEMENTS, RESTRICTIONS OR RESERVATION OF
RECORD WHICH WOULD BE DISCLOSED BY TITLE REPORT
ARE SHOWN.
5. CONTOUR INTERVAL: 2 FOOT
PARCEL B OF KING COUNTY BOUNDARY LINE
ADJUSTMENT, RECORDED UNDER RECORDING NO.
9802099012, RECORDS OF KING COUNTY, WASHINGTON.
NAVD 88
BASED ON GPS OBSERVATIONS.
SITE BENCH MARKS:
TBM 1: TOP OF REBAR AND CAP, SOUTH
OF ASPH DRIVE ON SITE AS SHOWN
ELEVATION = 430.40'
TBM 2: TOP OF REBAR AND CAP, 3.0' NORTH
OF EDGE OF ASPHALT, 15'± WEST OF
CENTERLINE OF PIERCE ST. N.
ELEVATION = 430.29'
EROF
G
I
E OY
D
U
Call: TOLL FREE
1-800-424-5555
C
LLA
B CALL BEFORE YOU DIG
1. KING COUNTY BOUNDARY LINE ADJUSTMENT,
RECORDED UNDER RECORDING NO. 9802099012,
RECORDS OF KING COUNTY, WASHINGTON.
09-24-21