HomeMy WebLinkAboutNORTON PARK Soils Information S-3317
279-2S8!
*~c~. ^~.,',~".*' ~..bruary 12, 1974
~' W.O. 16492
_Mr. L. E. Wyrick
c/o D~%, Consul.ting Engineers
800 Cordova Street
~cho~age, Alaska 99501
ktt~m, tion ,'
Mr. Maurice Oswald
Pro j e ct:
Norton Park Subdivision
DOWL W.O. 7166
S ~j ~ct:
S'ubEnrface Soils Exploration
Transmitted herein are the results of test pits placed at the
· specified locations and to maximum depths of Mr. Wyrick's
~,quipment.
The data is organized in this report as follows:
Location Sketch
Typical Soil Groups (this study)
Test Pit Logs
Standard Explanatory Data
Data not on Logs
Figure 1
Table A
Sheets 1 to 5
Sheets 6 to 8
Sheets 9 to 13
The test pits were placed by Mr. Wyrick uusing a wheel mounted
backkoe.
The test pit logging, sampling, san~p].e testing, data analysis
and report were done by Alaska Testlab.
The soils were exa/(~ined in the field axed in the laboratory with
the latter examination including grouping hy representative
textural types.
The upper soils tend to be silts (sand silt mixtures or clayey
silts) underlain by non-frost susceptible sands and gravelly
sands. Water was not encountered in any of the test pits opened.
~e site for Test Pit Six was heavily wooded, ,%nd the client's
equip~nt was too small to clear and excavate. Therefore, ~
Test Pit Six was not exca%-ated.
MEMDER
The materials encountered tended to be hard and/or dense
throughout.
The soils are described on 'the test hole logs in terms of the
text~ral, frost and Unified classifications. "Relative group"
is shown by sample and defined in Table A (the "relative
group" is a convenience with the group letters referring to this
study only}.
The group A soils are sands, and are non-frost susceptible.
The group B soils are gravelly sands, non-~rost susceptible.
The group C soils are slightly sandy, plastic silts, frost
susceptible°
The group D soils are slightly sandy silts (non-plastic)
a trace' of organic material, frost susceptible.
~%e group E soils are coarse silts (non-plastic), and frost
susceptible.
The gro~p F soi]-~ are sandy gravels, non-frost susceptible.
The group G soils are silty sands containing a trace of
organic material, and are frost susceptible.
~f we may be of further service to you in this regard, please
contact our office.
Very truly yours,
ALASKA TESTLAB
Laboratory Supervisor
EnclOSures
L~, [ i T' ? HOI~] LOCATION SKETCH
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DRAWN
2750 J,,7166
CHECKED
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TABLE A
Soil Groups
Typical Soil Types Encountered This Study
Frost Unified Textural
Group · Class. Class. Classification
A NFS SP . Sand
B NFS SP Gravelly Sand
C F-4 CL/ML Sandy Silt
D F-4 ML Sandy Silt
E F-4 ~ Silt
F NBS GP Sandy Gravel
G F-2 SM- Silty Sand
Sieve
Analysis
Sheet 9
Sheet 10
Sheet 11
.Not run
Sheet 12
Sheet 13
Not run
Test Pit
Occurance
1,2,4,5
3,5
3,4,5
2,4
1,3,4,5
1
1
Test Pit 1
Elevation: Exist ~2%? ground
W.O. 16492
Depth in Feet
From To
0.0' 1o5'
1.5' 3.0'
3.0' 8.0'
Soil Desc. r.iption
Brown, damp, silty sand, F-2, S~ (random
small ~ravel with trace of o__r3anic) ,
~roup C
Tan, damp, silt, F-4, ML, hard, non-plastic,
Group E.
Brown, damp, sandy ~ravel, NFS, GP, high
density, well graded, rounded ~ravel to
1-1/2", Group G
Brown, da/ap, medium to fine, sand, NFS,
SP, higk density, Group A
Bottom of Test Pit:
Frost Line:
~Free Water Level:
S amp] e De~_~
1 1.0'
2 2.0'
3 4.5'
4 9.0'
5 13.0'
13o0'
3.0'
None
Biows/6"
Type of Dry
Sam~e Strength Grou~
10.7 Grab N G
11.0 Grab L-N E
2.5 Grab N F
4.2 ~ Grab N A
4.0 Grab N A
Remarks:
1o Gro~p refers to similar materi'al, this study only
2. Dry strength, N = None, L = Low, ~. = ~.~ed., H = High
Test Pit 2 W.O. 16492
Elevation: E~isting ground
Depth in Feet
From To
0.0' 4.7'
4.7' 13.0'
Soil. Description
Brown, damp, s~ndv silt, F-4, ~, hard,
rmndom ~_~el~ organic on top, Grou~ D
Brown, medium to fine, damp, sand, NFS,
SP, high density, Group A
Bottom of Test Pit :
Frost Line:
Free Water Level:
~ample~ DeDt____~h
1 2.0'
2 6.0'
3 12.0'
13.0'
4.7'
None
Blows/6"
Type of Dry
M% Sample Strength Grou?
15.8 Grab L D
2.0 Grab M A
2.0 Grab N A
Remarks:
1. Group refers to similar material, this study only
2. Dry strength, N = None, L = Low, M = Med., H = High
Test Pit 3
Elevation: Existing ground
Depth in Feet
From To
0.0' 8.0'
8'.0' 9.5'
9.5.' 14.0'
W.O. 16492
Soil Description
Tan, damp, silt, F-4, CL/~, hard, PI-,
Group C
Tan, damp, silt, F-4, ~4L, hard, NP,
Group E
Brown, damp, gravelly sand, ~FS, SP, high
density, rounded ~ravels to ].-1/2", Group B
Bottom of Test:
Frost Line:
Free Water Level:
~amP.!~ Depth
1 4.0'
2 - 9.0'
3 10 ' -14 '
14.0'
2.5'
None
Blows/6"
Type of Dry
M% Sample Strength Grou~..
19.7 Grab M-H C
2 B. 4 Grab L E
1.9 Grab N B
Remarks:
1. Group refers to similar material, this study only
2. Dry s%reng~k, N = None, L = Low, M = Ned., H = High
Test Pit.4 W.O. 16492
Elevation: Existing ground
Depth in Feet.
From
0.0 ' l./-"
1.2'
7.0'
8.0~
Soil Description
Tan, damp, ~a~y_ silt, F-4, ~, stiff,
trace of organic, Group D
Tan, damp, silt, F-4, CL-~, hard, Pi-,
Group C
Tan, damp, silt, F-4, .~L, hard, NP, ~roup E
Brown, damp, medium to fine sand, NFS,
SP, high density, Group A
Bottom of Test. Fit:
Frost Line:
Free Water
Sample Depth
1 1.0'
2- 4.0'
3 7.5'
4 8'-1~"
12.0'
2.0'
None
Blows/6"
Type of Dry
~.{% Sample Strength Grou~ ·
17.1 Grab N D
22.5 Grab H C
26.4 Grab L E
15.7 Grab N A
G~o~r~ refers to similar material, this study only
Dry strength, N = None, L = Low, ~4 = .~4ed., E = High
Test Pit 5 W.0. 16492
Elevation: Exis ting gro~d
Depth in Feet
From To
0.0' 3.0'
3.0~ 7.5'
7.5' 9.5'
11.5'
11.5 ' 12.5 '
Soil Descri~ion
Be~, trees, other o_~.ani__c and silt mixture
Tan, ~amp, silt, F-4, CL/.ML, Pi-, very
hard, Group C
Brown, damp, mediu]~ to fine sand, NF'S, SP,
luigh d~ns ity, Group A
Tan, Oamp, silt, F-4, /~J~, NP, very hard,
Group E
Brown, damp, .g.r_~av_el~ly_ sand, NFS, SP, high
~usity~ to%untied ~ to 1-1/2"
Bottom of Test Pit-~:
~rost Line:
Free Water Level:
~ Dep~_
1 5.0~
2 7.5'-9'
3 9.5'-11.5'
4 12o0'
Re~arks: 1. ~
2.
3.
12.5'
2°0'
None
Type of Dry
Blows/6" M% Sample Strength Group
--- 19.8 Grab L-M C
--- 2.3 Grab N A
--- 15.9 Grab N E
--- 5.1 Grab N B
No s~ple taken.
Grouu refers to similar material, this study only
Dry strength, N = None, L = Low, ~ = Med., H = High
CONSULTATION
ALASKA TESTLAB
TESTING ~ EXPLORATION
CHEMICAL · MATERIALS · INSPECTION
50% GRAVEL
;IFICATION CHART
~ CLAYEY '
t../ CLAY E Y
/ OR \
<::)/ $ I.LT:Y' SI LTY
SI LTY ::~:: ',,, x \
\ ',,
s A N O . X,: .::::!! / :x x
\ IDY \GRAVE L
\ '~. \
GRAVELLY \ SA~
· o io zo 3o 40 50 60 70 80 90 ioo
GRAVEL (+~4$CREEN) % BY WEIGHT,_
NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN O.OZmm.
GR(XJPS OF FROST--SUSCEPTIBLE SOILS:
FI
F3 a.
F4, o.
b.
C.
GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN O.02mm.
SANDY SOILS' CONTAINING BETWEEN 3 AND 15% FINER THAN O.02mm.
GRAVELLY SOILS CONTAINING MORE THAN 20°/o FINER THAN O.O:~mm. AND SANDY SOILS
(EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mn',,
CLAYS WtTH PLASTICITY INDEXES OF MORE THAN 12. EXCEPT VARVED CLAYS.
ALL SILTS INCLUDING SANOY SILTS.
FINIS, SILTY SANDS CONTAINING MORE THAN 15% FINER THAN O.OZrnm.
LEAN CLAYS WITH PLASTICITY INDEXES OF LESS THAN 12..
VA. RVED CLAYS.
SHEE~ 7 OF 13
' ·TEST HOLE~LOGS
SOILS DESCRIPTIONS
The soil descriptions shown on the logs are the best estimate of the
characteristics at the time of field examination. Such examinations
do not achieve the precision of laboratory tests for the various
properties. ~
1. The relative type of soil and the frost classification is shown
on the sheet "Soil Classification Chart." An additional class or
classes are shown on "Unified" or other charts or references.
5
Other criteria:
Boulder - greater than 8" .~
Cobble- approximately 3" to 8"
B16w Count - blows/6" of 140 lb. weight falling 30"; 2" split
spoon. (The standard penetration J.s blows/12".)
Density - estimated by the rate of drilling, type of soil, blow
count and moisture range
PL - Plastic Limit, moisture content being-approximated as; above
(+) or below (-) plastic limit (PL) or liquid limit (Lw) as
appropriate
Lw ' Liquid Limit, see P
L
Dllatency - is the ability of water to migrate to the surface upon
vibration or jolting of a sample, an aid in determining
whet3~er a soil is predominately a clay or silt
Well graded -- uniformity coefficient greater than 7 See "Unified"
Poorly graded - uniformity coefficient less than 7 (Uniform
particles, gap graded) See "Unified"
Organic Content - estimated by volume, not particularly precise
Clayey Soils - a field method now being used as an aid to
identificatJ, on of these soils is a combination ball drop,
and rolled thread test in which a 2" diameter ball of the
Sand-Silt-Clay fraction is dropped 2' until a 1" thick pat
develops. The diameter of a thread at crtunblinG rolled from
the resultant pat determines whether clay or silt predominates
Dry Strength - a small sample of t. he soil is fotnmed into a cube
and air dried, and crushed between the fingers~ High dry
strengtk indicates clays and low indicates silts.
Water Table - the apparent water table at the time of observation.
Often t~e actual water table may be higher unless the hole
is allowed 'to remain open or is converted to an. observation
we 11.
Capillary Fringe - change from moist to very damp, or saturated
soil, usually indicates that water table is close.
Peat - Fibrous material of macrosc-,pic and microscopic frag.aents
of decayed vegetable matter; very compressible, unsuitable
for foundation or embankment. Color light brown to black.
· A° - The upper layer, surface soil or topsoil, containing hthmus
-- and/or organic debris, not satisfactory for foundation.
* Laboratory..data is often included for specific s~nples or groups of
samples, and may be included on the log or by separate tabulations
or enclosures.
ALASKA TESTLA~
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