27673 GEOTECHNICAL EVALUATION
71
- ~6ENfR,~~
~ NCJRTHWEST
: . ~ .
4btF~.
' SOlLS, TESTING & INSPECTION
~ August 1, 2002
Mr. Robert L. Heitman, Jr.
;.q Landmark Builders .
. 8225 North Division Street
0
Spokane, WA 99208 ~
~ n OFRC1Al. PU9UC DOCUMEKT
'Re: C-70-S020232 SppKANE COUtM ENGINEER'S OFFICE
Geotechnical Evaluation tn Proposed Shelley Lake 4 Addition PRWECCTT *
` Shelley Lake Lane SUBMITTAL # !
Spokane Counfiy, Washington RMRN TO COUMY ENGINEER
~
Dear Mr. Heitman:
-As you authorized on June 12, 2002, we have completed the geotechnical evaluation
for soil verification for the above referenced site in Spokane County, Washington. The
purpose of the testing was to verify soil conditions to assist Mr. Doug Desmond of CLC
Associates in design of stormwater management facilities and in preparing plans and
specifications for construction. These services are being provided to address the
conditions detailed in the Pre-Design Meeting Notes from the Spokane County
Engineer's Office dated May 29, 2002. This letter summarizes the results of our field
investigation.
RESULTS AND ANALYSIS
.s We excavated seven test pits to a depth of 15 feet. The test pit excavations were
located at proposed pond locations and select locations within the proposed roadway.
~ The locations are shown on the attached sketch. Also attached are logs of the test pits
~ showing the vertical sequence of soils encountered.
In general, the test pits encountered surficial deposits of silt -overlying alluvial gravels to
~ the termination depths of the test pits. Entry of water also was not present in any test
- pit excavation.
-y Grain size analysis tests were performed on samples obtained from three of the test
pits. The grain size analysis tests were then used to confi.rm our visual classification of
soils. Attached are grain size distribution curves for the samples tested. According to
' the SCS Soil Survey of Spokane County, the site soils are classified as Garrison very
~ gravelly loam and Garrison gravelly loam. Characteristic of these soils is a very dark to
black soil at the surface underlain by a substratum of brown to lig S. . This
-l
is consistent with our field fndings. A copy of the SCS soil surve 1W~~I`~
~ SEP 2 3 ?002
~ SPOKANE COUMY ENG1NEER
~ 2214 East Riverside Avenue • Spokane, WA 99202 • Phone (509) 534-9711 • Fax (509) 534-9755
z
' A Division of CLC Associates lnc.
~
z -
Robert L. Heitman, Jr. STI Project C-70-OS020232
Proposed Shelley Lake 4'h Addition - Geotechnical Evaluation August 1, 2002
~ STI Northwest Page 2
~ ' .
REMARKS
~ Services perFormed by the geotechnical engineers for this project have been conducted
~ in a manner consistent with that level of care ordinarily exercised by members of the
:
~ profession currently practicing in this area under similar budget and time restraints. No
warranty, expressed or implied, is made.
~
` We appreciate the opportunity to provide our services to you. If you have any questions
or need additional information, please do not hesitate to call Paul Nelson at 534-9711.
s •
Sincerely,
STI Northwest .
~
:c .
J
A`~i - . G+
Clint Wilson, E.I.T.
~ Staff Geotec ' I E ineer ~
~
,
~ ~ ~
.
~ ~ ~
Y Paul T. Nelson, P.E. .
Associate ExPtaES:
i
Attachments: Test Pit Location Sketch
Logs of Test Pits
~ Grain Size Distribution Curves
~ SCS Soil Survey Map
cc: Doug Desmond
CLC Associates
•1
~
•4,
i; caw/ptn/ckb:i:\documents\20021s100-s199\s020232\s020232 Qeotechnical report
~
. ~
_ - r~-x
~ - - 020232 JULY, 2Q02 C 70 S SHELLEY LAKE ~ ~ _ .
4TH ADDITION ~ , . - ~ . . . . DESIGN: CA 1 • ~ ~ . ~ - ~
, ~ ~ , ~ ~ ~ , \ . _ . • ~ - r~.w,.--- , • ` . , ~ ~ . c . . . . -
S okane'Coun . . _ _ . . P ~ ~ . . , REVIEWED BY: P . ~ (~R~THWEST' - ~ _ : ~ . • - ~ . ~ -
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~ LOG OF TEST PIT
~
jVTj NORTHWEST
: PRO.TECT: C-74-SQ20232 TEST PIT: TP-1
Geotechnical Evaluation LOCATTON:
~ Soil Type Verification See Attached Sketc6
; Shelly Lake 4th Addition
Spokane County, Washington
t DATE: 6/19/02 SCALE: 1" = 4'
. ASTM
° Elev. Depth D2487 Description of Materials WL Tests or Notes
2039.5 0.0 Symbol
SII,T witb GRAVEL, trace of roots, dark brown, -2038.5 1.0 moist.
~ - ~ (Topsoil) ~
SILT with GRAVEL, with cobbles, layered, brown,
moist.
3 (Alluvium)
-2035.5 4.0 .
~
0 4- WELL GRADED GRAVEL with SILT, medium to
y 0_ - coarse grained, with cobbles, light browq moist.
(Ailuvium)
_ ? _ GW :M
U '
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-2029.5 10.0
Y FOORLY GRADED GRAVEL wit6 SILT fine to
~ o - ~ t m~ium grained, dar~: brown, moisL
~
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GP o ,
> _ GM t
~
-2024.5 15.0 f ,
~
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~ ~ - END OF TEST PIT
- Water not observed to bottom of test piL
~
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Test pit immediately back-ftlled.
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: LOG UF TEST PIT
~ jWTff NORTHWEST
PROJECT: C 7aS020232 TEST PIT: TP-2
Geotechnical Evaluation LOCATTON:
~ Soil Type Verification See Attached Sketch
. .
Sheily Lake 4th Addition
Spokane County, Washingtoo
~ DATE: 6/19/02 SCALE: 1" = 4'
AST1Vi
~ Elev. Depth D2487 Description of Materials WL Tests or Notes
,2036.4 0.0 Symbol
~ _1U35.y U.~ IVL SQ.T with SAND, with roots, dark bmwn, mOist. -
~ . (Topsoil) ~
- t SII.TY GRAVEL, fine to medium grained, with
~ _ - ~ cobbles, lig}~t brawn, moist.
_ (Alluviuan)
~ - 1
A:2031.9 4.51
~
~ WELL GRA.DED GRAVEL wi~ SILT, medium to
~ - ~ coarse grainec, widi cohbles; layered, brown, moist
~ _ - GW ~ (Alluviuan)
- • ~
'>~,r
•~2027.9 8.51 .
POORLY GRADED GRAVEL with SILT, medium
~ s- ° t to coarse grained, with cobbles, browq moist.
(Alluvium)
0- GP k
~ cc GM o 00
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2021.4 15.0
~
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a END OF TEST PIT
Water not observed to bottom of test pit
~
~ v- Test pit immediately backfilled.
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LOG OF TEST PIT
~ ,*W NORTHWEST
i~ PROJECT: C-70-S020232 TEST PIT: TP-3
Geotechnical Evaluation LOCATION:
~ Soil Type Verification See Attached Sketch
Shelly Lake 4th Addition Spokane County, Washington
DATE: 6/19/02 SCALE: 1" = 4'
~ .
ASTM
y Elev. Depth D2487 Description of Materials WL Tests or Notx:s
20399 0.0 SYmbol •
` SILT, with fine roots, dark brown, moist.
' _2038.9 1.0 (Toosoil) -
WELL GRADED GRAVEL with SILT, medium to~
coarse grained, with cobbles, with fine roots down to
4 about 6', lingt brown, moist
• ~ (Alluvium)
_GW.~
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~ .
2033.4 6.51
1 WELL GRADED SAND with GRAVEL, mediwn
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to coarse grained., witii cobbles, brown., moisr.
.b - - r:•:• Sw (Alluvium)
~ > . .
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~ ~029.9 10.0
k ~ POORLY GRADED GRAVEL with SILT, medium - ,
_ to coarse grained, with cohbles, brown, moist.
~ ° f (Alluvium)
~ - GP o ,
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~ .2-2024.9 15.0 ~
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END OF TEST PIT
. ~
~ - Water not observed to bottom of lest pit.
rn -
~ .b Test pit immediately backfilled
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LOG OF TEST PI7' -
~ jFTff NORTHWEST
PROJECT: C-74-S024232 TEST PIT: TP-4
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Geotechnicat Evaluation LOCATION:
Soil Type Verificatiofl See Attac6ed Sketch
~ Sheily Lake 4th Addition
Spokane County, Wast►ington
DATE: 6/19/02 SCALE: 1" = 4'
- ASTM
= Elev. Depth D2487 Description of Materials WL Tests or Notes
2039.9 0.0 SYmbol . ~
ML ~ SILT with GRAVEL, with roots, daz0brown, moist
~ 2038.4 1.51 MI' 1 (TO-ps°il) ~
SILT widi GRAVEL, vvith cobbles, brown, moist.
. 1 (Alluvium) ~
F WELL GRADED GRAVEL with SII.T, medium to
r
t coarse grained, with cobbles, brown, mois-t.
_ • (Alluvium)
~ o ~034.9 5.0
WELL GRADED GRAVEL, mediwn to coazse
grained, with cobbles, brown, moist.
(Alluvitun)
~
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~ ? 2024.9 15.0 ~
~
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~ - Water not observed to bottom of test piL
~
Test pit immediately bacldilled.
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` LOG OF TEST PIT-- jWTff NORTHWEST
. ,
PROJECT: C-70.S420232 TEST PIT: TP-5
Geotechnical Evaluation LOCATION:
= Soil Type Verification See Attached Sketch
` S6elly Lake 4th Addibon
~ Spokane County, Washington
DATE: 6/19/02 SCALE: 1" = 4'
' ASTM
p Elev. Depdi D2487 Descripbion of Materials WL Tests or Notes
~ 2047.6 0.0 SYmboI _
. _ ~ SILT with GRAVEL, with fiae roots, black, moist.
2046.1 1.51 (Topsoil)
- J i WELL GRADED GRAVEL with SILT, fine to
GW medium grained, with cobbles, with roots down 4',
~ - j brawn, moist.
2043.6 4.0 •
01 WELL GRADED GRAVEL with SILT, mediwn to
~ 0 - ~ coarse grained, with cobbles, brown, moist.
(Alluvium)
~ ~ - GW :N
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~
~ b -2037.6 10.0
P~RLY GRADED GRAVEL witti SILT, fine to
a _ °coarse grained, with cobbles, brown, moist
f -0
Z! - (Alluvium)
cu GP
> _ GM
0
-2032.6 15.0 °c f
~
~
- END OF TEST PIT
Water not observed to bottom of test pit.
~ b Test pit immediately backfilled
t:
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LOG OF TEST PIT -
z WTl N4RTHWEST
~
~ PROJECT: C-70-S020232 TEST PIT: TP-s
Geotechnical Evaluation LOCATION:
~ Soil Type Verification See Attached Sketch
; Shelly Lake 4th Addition
Spokane County, Wastungton
9 DATE: 6/19/02 SCALE: 1" = 4'
. ASTM
' Elev. Depth D2487 Descriptian of Materials WL Tests or Notes
„ 2047.7 0.0 Symbol
-2046.7 1.0 M~ SELT, with fine roots, black, moist. -
-N . (Topsoil)
_ SILTY GRAVEL with SAND, fiae to coarse
- GM~ c grained, with cobbles, brown, moist.
~ (Allwium)
_2044.2 3.51 g
~ i o POORLY GRADED GRAVEL with SILT and
~ o_ ~ k SAND, medium to coarse grained, with cobbles,
~ o - browq moisrt.
0 , (Alluvium)
~ k
C - ~
.U - N - GP
_GM~ k
o
} 03 - 3
y ?
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~ ? -2032.7 15.0 , f
~
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~ ~ - END OF TEST PIT
'
~ - Water not observed to bottom of test pit
C/)
~ -a Test pit imraediately back6.lled.
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~ LOG UF TEST PIT -
~ jVr,ff NORTHWEST
~ PROJECT: C 70-S(YL0232 TEST PIT: TP-7
Geotechnical Evaluation LOCATION:
~ Soil Type Verification See Attached Sketch
Shelly Lake 4th Addition
Spolcane County, Washington
DATE: 6/19/02 SCALE: 1" = 4'
; ASTM
' Elev. Depth D2487 Description of Materials WL Tests or Nofies
„ 2044.9 0.0 Symbol
` -2-(44.2r 0-5 ML ~ SILT with GRAVEL, with fine roots, dark brown, r~
~ - - moist. .
Mi, (Topsoil) . .
~ SILT with GRAVEL,with cobbles, brown, moist.
2041.9 3.0 (Alluvium)
WELL GRADED GRAVEL with SILT, medium to
~ coarse grained, with cobbles, light brown to brown,
~ t 0 _ GM moist.
~ 0 ~ (Alluvium)
~ _2038.9 6.0
~ FOORLY GRADED GRAVEL wit6 SILT, fine ro
- k coarse grained, with cobbles, brown, moist
P.
(Alluvium)
00 -1__. a U 1
66
L: - - vlvl 00
f ° o~
-
b ~
~ cn .2029.9 15.0
~ b- - END OF TEST PIT
- Water not observed to bottom of tesrt pit.
~
~ - .
Test pit immediately back-filled.
~ -
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~ U.S. SIEVE OPENING IN INC, I U.S. SIEVE NUMBERS ITYDRO1uIETER
' 6 4 2 1.5 1 314 1n 3/8 3 4 6 810 14 16 20 30 40 so 60 100 140 ZU0
~
100 -
- 95 - : ~
y
~nJ ~ ~ } ~ ~ ~ ` ~ ~ • ~ ~ ~ ~ ~ ~ j ~ ~ ~ l ~ ~ ~ ' ~ ~ ~ ~ ~ ~ ~
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70 ,
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" 30 :
' 25-- _ : C- - - --r----
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100 10 1 0.1 0.01 O.W1
^ GRAIN SIZE IN MILLIMETERS
GRAVEL ~ SAND ~
COBBLES SILT OR CLAY
coarse ~ firte ~ coarse ~ medium ~ fine
~ Specimen Identifcation Description of Material LL ~ PL ~ PI ~ Cc I Cu
•1 TP-2 12.0 GP-GM Poorfy Graded Gravel with Sift 19.18 h5T.7
~ m ~ Tp-4 9.0 ~ GW - Well Graded Gravel 13•79 120.83
TP-6 8.0 ~ GP-GM - Poorfy Graded Gravel wi Sift and Sand ~ i 118•08 h 49.5
g I
I ~ I I I I
~ Specimen Identification ~ D100 ~ D60 ~ D30 ~ D10 %Gravel ~ %Sand ~ %Silt I °/flClay
• 1 TP-2 12.0 76.2 ~ 33.422 ~ 8.063 ~ 0.212 77.2 ~ 14.2 ~ 7.8
TP-4 9.0 101.6 ~ 27.819 ~ 11.873 ~ 1.335 ~ 79.0 ~ 13.0 ~ 4.4
$ TP-6 8.0 ~ 38.1 ~ 20.129 ~ 6.999 ~ 0.135 ~ 63.2 ~ 16.2 ~ 8.0
~ ~ ~ M I I I I I I
a
GRAIN SIZE DISTRIBUTION
d
N
s• Project: Soil Type Verifcation
Location: SheiiY Lake 4th Addition
JFTJ NORTHWEST rvumber: c-70-so20232 !
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SCS SOIL MAP
STI NORTHWEST Shelley Lake 4th Addition July 12, 2002
Spokane County,
AM "°RT""EST Washington JOB NO. C-70-S020232
DESIGN: CAW
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