HomeMy WebLinkAboutMINDYER MANORS Plat#78-294 No header sheet S-4880
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
PLATTING OR PLANNING AND ZONING CASE REVIEW
DATE RECEIVED
CASE NUMBER S-488(~'~
,\
PETITION FOR REZONING ~ OF
SPECIAL EXCEPTION~
VACATION
RE{3UBDIVISION
COMMENT TO PLANNING BY ',IUd,,,V 19, ~1978
COMMENTS:
ENVIRONMENTAL SANITATION:
Youngs Subdivision; Tryck Nyman Hayes for Youngs
FOR MEETING OF
August 2, 1978
PUBLIC WATER NOT AVAILABLE
of Cases
PUBLIC SEwER':;NOT AVAILABLE TO SERVICE PETITION AREA.
, ' , \ -f . ,' ¢, ii
ENVIRONMENTAL ENGINEERING:
71-014 (9/76)
4040 "B" STREET
ANCHORAGE, ALASKA 99503
(907) 278-1551
August 8, 1978
W.O. #A18567
Mr. Tod Youngs
P.O. Box 4-2482
Anchorage, AK
99509
Subject:
Subsurface Investigation for Youngs Subdivision
Located in the SW 1/4, Section 3, T. 11N.,
R. 3 W., Seward Meridian, Alaska
Dear Mr. Young:
We were requested by Mr. Dave Grenier with Tryck, Nyman &
Hayes to perform a preliminary subsurface investigation on
the above referenced parcel to ascertain its suitability for
construction of on-site sewage disposal systems in conjunc-
tion with the development of R-6 type lots.
A total of seven, 16' test holes were drilled on the site
using a track mounted Mobile Drill B-50 drill rig owned and
operated by Denali Drilling, Inc. The test holes were
logged and the drilling supervised by Mr. Terry L. Barber,
staff geologist with Alaska Testlab.
Each hole was drilled using continuous, solid flight auger.
As the drill bit was brought to the surface at 5' intervals,
samples were taken directly off the drill bit, placed in
sealed plastic bags and transported to the laboratory where
their natural moisture content and dry strength were determined.
Each sample was then visually classified with samples of
similar color, texture, and grain size distribution being
given an arbitrary group designation. Further testing was
then performed on composite sample from. the group rather
than on individual samples.
Due to the necessity of getting this report out prior to the
Municipal Planning meeting, we have not yet completed the
laboratory testing on the soils samples. We have therefore,
included with this report copies of the field logs and no
laboratory test results. In a few days an addendum to this
report will be issued with the final test hole logs, descrip-
tion of soil types encountered and copies of the laboratory
test results.
Mr. Tod Youngs
~ugust 8, 1978
Page 2
Slotted, 3/4" PVC pipe was placed to full depth in test
holes #1, #5, and #7 and a percolation test run in those
holes° The results of those percolation tests are:·
Test Hole 91:
Test Hole #5:
Test Hole #7:
10 minutes/inch
8 minutes/inch·
20 minutes/inch
In addition, to drilling the holes and running a percolation
test, our geologist walked the entire site, mapping out the
paths of the two streams that transverse the site. It
became obvious from the drilling, and from walking the site,
that there were areas of poor drainage the ground surface
and shallow soils were saturated. Four major areas where
this occurred were identified and are mapped out by ~he
geologist. These are shown on Figure 1. In addition, there
were two areas where seepage was coming out of road cuts'and
those were also identified on the enclosed Figure 1.
It should be noted that shallow, subsurface water was
encountered in test holes #4, #4A, #2, and #6. There is
some problem with subsurface water on this site.
Except in the areas immediately adjacent to the two streams,
we do not feel that this shallow, subsurface water is true
ground water, or even perched water. It is our opinion~.~·~_
that it is merely surface runoff associated With the heavy~
rains of the past two months that has not drained'properly
and has saturated certain areas of the site. This saturation
generally extends to a realtively shallow depth, i.e., less
than ·10' In other cases, it is following more permeable
seams and may exist relatively close to the surface, say
less than 10'.
Based on the data that we have collected there should be no
problem, from a permeability standpoint, with constructing
on-site sewage disposal systems to meet MUnicipal standards
on all proposed lots within the subdivision. Additional
soils and percolation data may be present to give specific
design values for certain lots. We refer you to Table B
included in this report, that is the summary listing of each
lot of the subdivision with an estimated percolation rate.
However, due to the presence in some areas, as identified on
Figure ~ of shallow, subsurface water, it may be necessary
to do additional testing to verify locations on specific
lots where shallow, subsurface water will not affect the on-
Mr. Tod Youngs
~ugust 8, 1978
Page 3
site disposal system. It may also be necessary to reduce
the area of influence, and the amount, of shallow, .subsurface
water through the use of improved drainage and ditching.
This matter needs further consideration.
If we can offer any clarification for any item discussed in
this report or any data presented, please contact us.
Very sincerely,
ALASKA TESTLAB
Melvin R. Nichols, P.E~
Laboratory Manager
MRN:rb:mm
Enclosures
Lot'
Block 1
Block 2
Percolation
Rating
8 Min/inch
12 Min/inch
15 Min/inch
15 Min/inch
12 Min/inch
12 Min/inch
20 Min/inch
20 Min/inch
20 Min/inch
20 Min/inch
TABLE B
Comments
Measured rating.
Estimated rating. Keep
system in SW portion of lot.
Estimated rating. Keep
system well above stream
and wet area. May encounter
shallow subsurface water.
Estimated rating. Control
shallow subsurface water or
find a spot on the lot '
where it does not present a'
problem.
Visual rating. Control shallow
subsurface or find an area on
the lot where it does not
present a problem.
Visual rating. Control shallow
surface water or find an area
found on the lot where it does
not present a problem.
Measured rating. System needs
to be kept to the rear of the
lot to avoid problems with
shallow subsurface water.
Measured rating. Keep the
system to the rear of the lot
to avoid problem with shallow
subsurface water.
Measured rating. Keep the
system mid-way between the two
streams to avoid shallow
subsurface water.
Estimated rating. Keep the
system mid-way'between the two
streams on the rid~? to avoid
problems with shallow subsurface
water.
(Continued)
Table B (Continued)
Lot
(Block 2)
5
Block 3
1
Percolation
Rating
12 Min/inch
20 Min/inch
20 Min/inch
10 Mifr/-i'Ach
Co~,~,ents
Estimated rating. Keep the
system to the north portion of
the lot to avoid
shallow subsurface water
problems.
Estimated rating. Shallow
subsurface water if encountered
should be controlled or an
area on the lot found where it
does not present a problem.
Estimated rating. Shallow
subsurface water when encountered
must'be controlled or found on
..an area of the lot where it
does not present a problem.
Measured rating.
NOTES:
Ail estimated ratings are from extropolated data and
are intended to be quite conservative. It may prove
economic on those lots to actually place a test hole
and run a percolation test prior to constructing a
system on the site. This is particularly true on Lots
3, 4, 5, 6, and 7, Block 2.
5
It is anticipated that shallow, subsurface water may
present problems in Block 1, Lots 2, 3, 4, 5, and 6;
Block 2, Lots 6 and 7.
Test HOle Field
Hole No.
Location
Water Level While Drilling
Water Level After Drilling,
Frost /"/ r~ ~, ~ Drill ,C~ .... /.
Log
Weather
Project f,, '2 -~'i/'/.
Hole No. ~ ~
Location
Test H'~le
Field- Log
Water Level While Drilling ~/.¢;--,.- Logged By,&~/,'/
Water Level After
Penetration
Client
Project
Hole
Locotion
Test H61e
Water Level While Drilling
Water Level After Drilling
Frost // .... u.: Drill ......
Field- Log
W, O. No.
Logged By--'v
Driller
Weather ,~/L/j/ -/
A-~TES~TLAB
Client
Project
Ho~e No. ///~
Location
Test Hole Field'Log
W.O.
Date
III II I I I II I I II I
Water Level While Drilling ~-"'--/'~
· _:. Logged By
Water Level After Drilling Driller ;2,
Frost /}}~, .~ '~ ~
/:~ ~- Drill ~_~-~9/J ~' Weather
'-T-ESTLAB)
Client
Project
Hole No.
Location
Test Hole Field' L'og
W.O. No. /r- ,, ,
Date
Water Level While Drilling -~>~,~ ._/.x~? Logged By---?'
Water Level After Drilling. Driller .!-'~./'..~'
Frost /-/~ ~' .~ "? ~ ~:Drill ./'/-:" ..'? "?~ Weather
I
Ill tl I II II I I II I
Client '>%,..- ~
Project ~'
Hole No. ~_~ --
Location
Test H'O'I e
Field-Log
Water Level While Drilling
Water Level After Drilling
Frosf '; ' J
Date ?- ~7- '-: :'
~;' - ~ Logged By ~':
-'T /'
Driller _,/~4~
Drill /~'L"'_'k½ -: Weather
(ALAS ~KA~-TES.TLAB'')
Client · .~/~a
Project )'~O ..,..~ ~'¢T/~ ~
Hole No. 7 J
Location
Test Hole Field'L'og
W.O. No.~ ~ ... ~-, /
Date '~ -/- -?~'
Water Level While Drilling //~?,-,, '? "~ '. Logged By.
Water Level After Drilling Driller
Frost: ~ '3 ~ , .: '~ ~.~Drill ~ ~-.": Weather
Test Hole Lo~l - Description Guide
The soil descriptions shown on the lugs are the best estimate of the soil's
characteristics at the time of field examination and as such do not achieve the
precision of a laboratory testing procedure. If the log includes soils samples,
thom samples receive an independent textural classification' in the laboratory
to verify the field examination.
The logs often include the following items:
Depth Interval - usually shown to 0.1 foot, within that zone no
significant change in soil type was observed through drill action, direct
observation or sampling,
Frost Classification - NFS, FI, F2, F3, F4, see "Soil Classification
Chart"
Texture of Soi~ - An engineering classification of the.soils by particle
stze and proportion, see "Soil Classification Chart", note the
proportions are approximate and modifications to the soil group due to
stratificatinn, inclusions and changes in properties are included.
;Moisture Con£ent this is a qualitative measure:
dry, m~ or little apparent surface moisture,
damp, moisture forms portion of color, less than plastic limit,
wet, no frec water, often soft, ii' cohesive soil,
saturated, free water may be squeezed out, ifa free draining soil;
dilatent at natural moisture content, if a non-plastic silt or fine
sand. (The moisture content is further defined by reference to PI,
LW, NP. M%or dilatency.)
Density - refers to more-or-less non-cohesive soils, such as sand gravel
mixtures with or without a fine fraction, derived from drilling action
and/or sample data: usually described as: very loose, loose, medium
dense, very dense. General intent is to portray earthwork
characteristics.
Stiffness - refers to more-or-less cohesiv? soils and-fine grained silts of
t e'"~y-silt groups. Derived from drill action and/or sample data. Very
soft, soft, stiff, very stit'f and hard are commonly used serms.
Particle size - The largest particle recovered by the split spoon is
1-3/8". Shelby tube Y'. auger (lights (minute-man) 2". Auger flights
(13-50 hollow stem) b"-8". Larger particles are described indirectly by
action of cite drilling and are referred to as cobbles, 3" to 8", or
boulders 8"+. Therefore when reviewing the gradation sheets, if any,
the description on'the hole log must be considered for an'indication of
larger particles,
Unified Soft Classification - This is a two letter code, See Unified
Classification sheet t~r further definition. In some cases AASHO and/or
FAA soil classifications may be shown as well as the unified.
Atterberg Limits - useful for fine grained and other plastic soils.
PI; natural moisture content believed to be less than plastic limit
PI+; natural moisture content believed to be between plastic and liquid
I-/mits
L..~; natural moisture content believed to be greater than liquid limit
- N.~.P; non-plastic, useful as a modifying description of some silty
mat~ri~ls.
Dilatencv, - is the abdity o( water to migrate to the surface of a
saturated or nearly saturated soil sample when vibrated or jolted - used
as an aid to determine if a fine grained soil is a slightly or non-plastic
silt or a volcanic ash.
Rock flour - finely ground soil that is not plastic but otherwise appears
similar to a c~yey silt.
Organic Content - usually described as Peat, PT, sometimes includes
discrete particles such as wood, coal, etc. as a modifier to an inorganic
soil. Quantity described as; trace, or an estimate of volume, or, in case
of ail organic, - as Peat. This may include tundra, muskeg and bog
material.
Muck - a modifier used to describe very soft, semi-organic deposits
usually occuring below a peat deposit.
Amorphus peat - organic particles nearly or fully disintegrated.
Fibrous Peat - organic particles more-or-less intact.
Bottom ofTesthole - includes last sample interval.
Frost Line - seasonal frost depth as described by drilling action and/or
samples at the time of drilling.
Frozen Ground - other than frost line. described by samples, usually
includes description of ice content, often will include modified Unified
Classification for frozen soils - this is a special case related to
permafspst studies,
Free Water Level -- The free water level noted during drilling. This is
not necessarily the static water table at the time of drilling ot ~t other
seasons. Static water table determination in other than very permeab e
soils requires observation wells or piezometer installations, used only in
special cases.
Blow/6" - The number of blows of a 140 weight free falling 30" to
advance a 2" split spoon 6"; the number of blows for a 12" advance is,
by definition, thc standard penetration.
.A% - natural moisture content of the soil sample, usually nnt
pe--~r ormed on clean sands or gravels below the water table.
Type of Sample -
S__P, refers to 2" split spoon driven into the soil by la0 pound
weight, a disturbed sample,
_S, thin wall tube, "Shelby" Used to obtain undisturbed samples
of fine grained soil,
G, "grab" disturbed sample from auger flights or wall of trench.
.~, cut sample, undisturbed sample from wall of trench.
Dry Strength - a useful indicator of a soil's clayey fraction, N=None.
L=Low, M~Medium, H=High
- The samples are placed into apparently similar groups based
or and texture and are arbitrarily assigned a group '.etter. Further
disturbed tests including Atterberg Limits, grain size, moisture~tensity
relationship, etc. may be performed on the group and are assumed to
reflect the general distrubed characteristics of the soils assigned to the
group. This is an important phase of the soil analysis and is used to
standardize the various qualitative determinations and to reduce the
number of quantitative tests necessary to describe the soil mass.
SOIL CLASSIFICATION CHART
30% GRAVEL
CLAY
\
CLAYEY CLAYEY CLAYEY
oR\
OR
SI LTY SI LTY
SILTY
SAND
GRAVELLY SAND
CLAYEY
SILTY
SANDY GRAVEL
GRAVEL
GRAVEL (+#4 SCREEN) % BY WEIGHT
NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN 0,02 mm.
GROUPS OF FROST-SUSCEPTIBLE SOILS:
F1 GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mm.
F2 SANDY SOILS CONTAINING BETWEEN 3 AND 15% FINER THAN 0.02 mm.
F3 a. GRAVELLY SOILS CONTAINING MORE THAN 20% FINER THAN 0.02 mm. AND SANDY SOILS
{EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
b. CLAYS WITH PLASTICITY INDEXES OF MORE THAN 12. EXCEPT VARVED CLAYS.
F4 aD ALL SILTS INCLUDING SANDY SILTS.
b, FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
c. LEAN CLAYS WITH PLASTICITY INDEXES OF LESS THAN 12.
d. VARVED CLAYS,
/\
SAND GRAVELLY SAND SANDY GRAVEL GRAVEL
0 10 20 30 40 50 60 70 80 90 100
!
4040 "B" STREET
ANCHORAGE, ALASKA 99503
(907) 278-1551
W.6. #A18~67
Mr. Todd Youngs
P.O. Box 4-2482
Anchorage, AK 99509
Subject: Addendum to Subsurface Investigation for
~ubdivision ~'~ ~
Dear Mr. Youngs:
As discussed 'in our original report to you dated August 8,
1978, we had not time to complete the laboratory analysis of
the soil samples taken during the subsurface investigation
for the above referenced project. That work has now been
completed. This addendum is intended to give a detailed
description of the major soil groups encountered during the
exploration, present the final adjusted test hole logs, and
present all of the results of the laboratory testing.
Six major soil groups were identified and are described
be'iow:
Group A
is a brown Sandy Gravel, it is non-frost suscep-
tible, being rated NFS. Its unified classification
is GW and its gradation is shown on Sheet 1. This
material will be excellent for base material for
road construction. Its permeability is high and
it should prove excellent for disposal of effluent
from on-site sewage disposal systems.
Group B
is a grey Silty Gravelly Sand that is highly frost
susceptible, being rated F-3. Its unified class-
ificatioh is SM and its gradation is shown on
Sheet 2. This soil is moderately permeable.
Group C
is a grey to brown Silty Sandy Gravel that is
moderately frost susceptible, being rated F-1.
Its unified classification is SM. This is a
borderline material between a gravel and a sand.
The gradation for this group shown on Sheet 3
shows the soil as being a sand, however, this is
probably incorrect in a strict sense in the native
state, because the drilling does not pick up as
much of the coarse fraction as usually exists.
Therefore, on the test hole logs this material has
been referred to as a gravel rather than a sand.
Mr. Todd Youngs
August 14, 1978
Page Two
Group D
is a brown Sandy Silt that is highly frost sus-
ceptible being rated F-4. Its unified class-
ification is ML.
Group E
is a brown Silty Sand that is mcderately frost
susceptible, being rated F-2. Its unified class-
ification is SM.
Group F
Ks a grey Sandy Silt that is highly frost sus-
ceptible, being rated F-4. Its unified class-
ification is SM. Its gradation is shown on Sheet 4.
In reference to the Table B included in the initial report
dated August 8, 1978, it listed an estimated, or actual,
percolation rating for each lot of the subdivision. We
would like to add to that a note of caution. These values
obviously come from extrapolation of data. Indeed even
where a single test hole is placed on one lot, that test
hole represents a very small portion of the actual surface
area of the lot. Therefore, the values listed in that table
should only be used as an indicator and should be verified
by visUal classification of the soils at the time the exca~
vation of the absorption trench is completed. If the soils
appear to vary substantially from the descriptions given in
the test hole logs, either much more permeable or much less
permeable, the writer should then be contacted so that an
adjusted rating of the soil be accomplished.
If there are any further questions, please do not hesitate
to contact us.
Very sincerely,
ALASKA TESTLAB
Melvin R. Nichols, P.E.
Laboratory Manager
MRN:rb
Enclosures
Test Hole #1
Table A
WO #Al 8567
Logged By: O.M. Hatch
Date: 7-29-78
Depth in Feet
From To
0.0' - 0.5'
0.5' - 3.0'
3.0' - 16.0'
Soil Description
Brown Peat, Pt, damp, soft.
F-2, brown Silty Sand, SM, damp, medium density.
NFS, brown Sandy Gravel, GW, damp, medium den-
sity, Group A.
Bottom of Test Hole:
'Frost Line:
Free water Level:
16.0'
None Observed
None Observed
Sample Depth
1 5.0'
2 10.0'
Type of Dry
M% Sample Strength Group Unified
- G ..- A GW
- G - A GW
Remarks: 1.
3.
4.
5.
6.
Type of Sample, G=Grab, 'SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #2
Table A
WO #A18567
Logged By: O.M. Hatch
Date: 7-29-78
p~pth in Feet
From To
0.0' - 1.0'
1~0' - 7.0'
7.0' - 10.0'
10.0' - 16.0'
Soil Description
Brown Peat, Pt, damp, soft.
F-3, brown Silty Sandy Gravel, SM, damp,
medium density, particles to 3", Group B.
F-4, brown Sandy Silt, ML, damp, stiff, NP,
particles to 2", Group D.
F-3, brown Silty Sandy Gravel, SM, damp, high
density, particles to 12", Group B.
Bottom of Test Hole:
Frost Line:
Free Water Level:
16.0'
None Observed
3.0' two days after drilling
Sample Depth
I 5.0'
2 10.0'
3 16.0'
M%
Type of Dry
Sample Strength Group Unified
G - B SM
G - D ML
G - B SM
Remarks: 1.
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study Qnly.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #4
Table A
WO #A18567
Logged By: T.L. Barber
Date: 8-5-78
Depth in Feet
From To
0.0' - 0.5'
0.5' - 12.0'
12.0' - 16.0'
Soil Description
Brown Peat, Pt, wet to saturated, soft.
NFS, brown Sandy Gravel, GW, damp to saturated,
high density,.Group A.
F-3, grey Silty Gravelly Sand, SM, saturated,
medium to high density, particles to 1",
Group B.
Bottom of Test Hole:
Frost Line:
Free Water Level:
16.0'
None Observed
7.5'
Sample Depth
1 5.0'
2 10.0'
3 16.0'
Type of Dry..
M% Sample Strength Group Unified
4.2 G N A GW
8.7 G N A GW
12.3 G L B SM
Remarks: 1.
e
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #4A
Table A
WO #A18567
Logged By: T.L. Barber
Date: 8-5-78
Depth in Feet
From To
0.0' - 3.0'
3.0' - 16.0'
Soil Description
Brown Peat, Pt, saturated, soft.
F-l, grey to brown Silty Sandy Gravel, GM,
damp to saturated, damp aT ]~.07~ ~-~up C.
Bottom of Test Hole:
Frost Line:
Free Water Level:
16.0'
None Observed
6.5'-12.0'
Type of
Sample Depth M% Sample
1 5.0' 7.7 G
2 10.0' 10.2 G
3 16.0' 11.6 G
Dry
Strength Group Unified
N-L C GM
L C GM
L C GM
Remarks: 1.
'2.
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #5
Table A
WO #A18567
Logged By: T.L. Barber
Date: 8-7-78
Depth in Feet
From To
0.0' - 0.5'
0.5' - 6.5'
6.5' - 11.'5'
11.5' - 16.0'
Soil Description
Brown Peat, Pt,. damp, soft.
F-l, brown Silty Sandy Gravel, GM, damp,
high density, Group C.
F-4, brown Sandy~Silt, ML, random gravel,
damp, stiff, NP, Group D.
F-2, brown Silty Sand, SM, damp, medium to
high density, particles to 3/4", tight,
Group E.
Bottom of Test Hole:
Frost Line:
Free Water Level:
Sample" Depth M%
1 2.5' 3.8
2 10.0' 11.7
3 16.0' 8.1
16.0'
None Observed
None Observed
Type of Dry
Sample Strenqth Group Unified
G N C GM
G L . D ML
G L E SM
Remarks: 1.
e
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #6
Table A
WO #A18567
Logged By: T.L. Barber
Date: 8-7-78
Depth in Feet
From To
0.0' - 10.0'
10.0' - 15.0'
Soil Description
F-l, brown Silty Sandy Gravel, GM, damp to
saturated, me~' density, Group C.
F-3, brown Silty Gravelly Sand, SM, damp to
wet, Group B.
Bottom of Test Hole:
Frost Line:
Free Water Level:
15.0'
None Observed
Saturated 4.0' to 8;0'
Sample Depth
1 2.5'
2 5.0'
3 10.0'
4 15.0'
Type Of Dry
M% Sample Strength Group Unified
9.0 G L C GM
9.3 G L C GM
10.2' G L-M B SM
10.2 G L B SM
Remarks: 1.
e
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
Test Hole #7
Table A
WO #A18567
Logged By: T.L. Barber
Date: 8-7-78
Depth in Feet
From To
0.0' - 0.5'
0.-5' - 7.0'
7.0' - 20.0'
Soil Description
Brown Peat, Pt, wet to saturated, soft.
F-3, brown Silty Gravelly Sand, SM, medium
density, Group B.
F-4, grey Gravelly Sandy Silt, SM, damp to
wet, stiff, NP, Group F.
Bottom of Test Hole:
Frost Line:
Free Water Level:
20.0'
None Observed
None Observed
Sample Depth
I - 2.5'
2 5.0'
3 10.0'
4 15.0'
5 20.0'
Type of Dry
M% Sample Strength Group Unified
7.4 G L B SM
8.9 G N C GM
10.1 G L-M F SM
-9.6 G N-L F SM
12.0 G L-M F SM
Remarks: 1.
m
3.
4.
5.
6.
Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
Dry Strength, N=None, L=Low, M=Medium, H=High.
Group refers to similar material, this study only.
General Information, see Sheet 1.
Frost and Textural Classification, see Sheet 2.
Unified Classification, see Sheet 3.
o ~ ~ o
II II
o~
~ ~ ~ o
Test Hole Lo~ - Description Guide
The soil descriptions shown on the logs are the best estimate of the soil's
characteristics at the time of field examination and as such do not achieve the
precision of a laboratory testing procedure, If the log includes soils samples,
those samples receive an independent textural classification in the laboratory
to verify the field examination.
The logs often include the following items: ,
Depth Interval - usually shown to 0.1 foot, within that zone no
significant change in soil type was observed through drill action, direct
observation or sam piing.
Frost Classification - NFS, Fl, F2, F3, F4, see "Soil Classification
Texture of Soil - An engineering classification of the soils by particle
size and. proportion, see "Soil Classification Chart", note the
proportions are approximate and modifications to the soil group due lo
stratification, inclusions and changes in properties are included.
Moisture Content this is a qualitative measure:
d_[Z, no or little apparent surface moisture,
damp. moisture forms portion of color, less than plastic limit,
wet, no free water, often soft, if cohesive soil,
saturated, free water may be squeezed out, ifa free draining soil;
dilatent at natural moisture content, if a non-plastic silt or fine
sand. (The moisture content is further defined by reference to PI,
LW, NP, M%or dilatency.)
Density - refers to more-or-less non-cohesive soils, such as sand gravel
mixtures with or without a fine fraction, derived from drilling action
and/or sample data; usually described as: very loose, loose, medium
dense, very dense. General intent is to portray earthwork
characteristics.
Stiffness - refers to more-or.less cohesive soils and fine grained silts of
~silt groups. Derived from drill action and/or sample data. Very
soft, soft, stiff, very stiff and hard are commonly used terms.
Particle size -- The largest particle recovered by the split spoon is
1-3/8", Shelby tube 3", auger flights {minutc-manJ 2", Auger flights
(13-30 hollow stem) 6"-g". Larger particles are described indirectly by
actioh of tile drilling and are referred to as cobbles, Y' to 8". or
boulders 8"+. Therefore when reviewing the gradation sheets, if any,
the description on the hole log must be considered for an'indication of
larger particles.
Unified Soil Classification - This is a two letter code. See Unified
Classification sheet lk)r further definition. In some cases AASHO and/or
FAA soil classifications may be shown as well as the unified.
Atterberg Limits - useful for fine grained and other plastic soils.
Pl; natural moisture content believed to be less than plasti~ limit
PI+; natural moisture content believed to be between plastic and liquid
l~mits
Rock flour - finely ground soil that is not plastic but otherwise appears
similar to a clayey silt.
Organic Content - usually described as Peat, PT, sometimes includes
discrete particles such as wood, coal, etc. as a modifier to an inorganic
soil. Quantity described as; trace, or an estimate of volume, or, in case
of all organic, - as Peat. This may include tundra, muskeg and bog
material.
Muck - a modifier used to describe very soft, semi-organic deposits
usually occuring below a peat deposit.
Amorphus peat - organic particles nearly or fhlly disintegrated.
Fibrous Peat - organic particles more-or-less intact.
Bottom of Testhole - includes last sample interval.
-.
Frost Line - seasonal frost depth as described by drilling action and/or
samples at the time of drilling.
Frozen Ground - other than frost line, described by samples, usually
includes description of ice content, often will include modified Unified
Classification for frozen soils - this is a special case related to
permafrost studies.
Free Water Level - The free water level noted during drilling. This is
not necessarily the static water table at the time of drilling or at other
seasons. Static water table determination in other than very permeable
soils requires observation wells or piezometer installations, used only in
special cases..
Blow/6" - The number of blows of a 140 weight free falling 30" to
advance a 2" split spoon 6"; the number of blows for a 12" advance is,
by defi~tition, the, standard penetration.
,d% - natural moisture content of the soil sample, usually not
pe~ormed on clean sands or gravels below the water table.
Type of Sample -
S.._P. refers to 2" split spoon driven into the soil by 140 pound
weight, a disturbed sample,
S, thin wall tube. "Shelby" used to obtain undisturbed samples
of fine grained soil,
G, "grab" disturbed sample from auger flights or wall of trench,
C. cut sample, undisturbed sample from wall of trench.
Dry Strength - a useful indicator of a soil's clayey fraction, N=None,
L=Low, M=Medium, H=High
L_._~; natural moisture content believed to be greater than Liquid limit Group - The samples a, re placed into apparently similar groups based
.... on color and texture and are arbitrariiy'a~signed a group '.etter. Further
NP; non-plastic, useful as a modifying description of some silty disturbed tests including Atterberg Limits, grain size, moisture4ensity
materials, . relationship, etc. may be performed on the group and are assumed to
reflect the general distrubed characteristics of the soils assigned to the
Dilatency - is the abdity of water to migrate to the surface of a group. This is an important phase of the soil analysis and is used to
saturated or nearly saturated soil sample when vibrated or jolted -- used standardize the various qualitative determinations and to reduce the
as an aid to determine if a fine grained soil is a slightly or non-plaltic number of quantitative tests necessary to describe tile ~oil mass.
silt or a volcanic ash,
SOIL CLASSIFICATION CHART
!
30% GRAVEL
ClAY
OR
SILTY
SAND
SAND:':
CLAYEY
CLAYEY
/;:~CLAYEY
:":SILTY;:::'.'
.:.GRAVELLY SAND
GRAVELLY
20 30
GRAVEL
/
SAND
SILTY
SANDY GRAVEL
SANDY ;RAVEL
:GRAVEL,:
GRAVEL
0 1 0 40 50 60 70 80 90.
(+#4 SCREEN) % BY WEIGHT
NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN 0.02 mm.
GROUPS OF FROST-SUSCEPTIBLE SOILS:
F1 GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mm.
F2 SANDY SOILS CONTAINING BETWEEN 3 AND 15% FINER THAN 0.02 mm.
F3 a. GRAVELLY SOILS CONTAINING MORE THAN 20% FINER THAN 0.02 mm. AND SANDY SOILS
(EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
b. CLAYS WITH PLASTICITY INDEXES OF MORE THAN 12. EXCEPT VARVED CLAYS.
F4 a. ALL SILTS INCLUDING SANDY SILTS.
bo FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
c. LEAN CLAYS WITH PLASTICITY INDEXES OF LESS THAN 12.
d. VARVED CLAYS.
1 O0
SUBSURFACE INVESTIGATION FOR YOUNGS SUBDIVISION
SW1/4, Section 3, TllN, R3W, SM, Alaska.
The subsurface investigation was conducted on July 3, 1978 using
a Case 580 Backhoe to excavate the test pits.
Test pit sites were chosen by the Engineer and logging was performed
by Marvln Beyer, P.E.
A total of 2 test pits were placed at locations on the property so
as to reasonably represent the soils within the proposed subdivision.
Test pits are located by pacing from topographic features determined
from the topographic map of the area; therefore, locations are approximate.
The proposed subdivision is located south of Anchorage on the
eastern side of Turnagain Arm. The area is heavily tree covered with a
small stream traversing the property. The soil consists of about 2 feet
of black organic silt underlain with silty sandy gravel with lenses of
clean sand and clean gravel. An existing road traverses the property
and this road has been constructed by removing the black organic silt
topsoil grading and using native material for a road bed.
The free water level encountered in Test Pit No. 1 appears to be a
localized occurrance and is not indicative of the ground water level of
the area.
All soils analyses were by visual classification.
lmc
Test Pit No. 1
Depth in Feet
From To
0.0 o.5
0.5 2.2
2.2 4.8
4.8 I0.5
10.5 13.0
YOUNGS SUBDIVISION
Date: 7-3-78
Logged by: M. Beyer, P.E.
Soil Description
Vegetation
OL, black organic silt
F4, CL, clayey silt, blue, plastic, some gravel and
sand
F2, GM, silty sandy gravel
NFS, GP, fine sandy gravel
13.0
Free water level:
Bottom of Hole
10.5'
Test Pit No. 2
Depth in Feet
From To
0.0 1.0
1.0 7.O
7.O 8.2
8.2 12.0
YOUNGS SUBDIVISION
Date: 7-3-78
Logged by: M. Beyer, P.E.
Soil Description
Fl, GM, Silty gravel fill
F2, GM, Silty sandy gravel, damp
Fl, GM, Lens of cleaner sandy gravel, damp, loose
F2, GM, Silty gravelly sand, hard, dry, occasional
4"+ boulder
12.0
Free water level:
Bottom of Hole
None
~ ~Test Hole Lo9 - Descrintlon Guide
The ,'~ -h~criptions shown on the logs ate the hess estimate of the soil's
.:haracterishcs at thc time of field examination and its such do no[ achieve th~
precision -.~ a laboralo~y tcs(ing procedure. I[ t~e log ~cludes soils samplc~,
those samFs':s receive an independent textural classification in thc laboratory
The logs. hen include the following items:
usually shown to 0.! foot, within that zone no
D,..k, th lnte_.r~a~l "itl s~d type was observed through drill action, d~ect
observation or .ampling.
F~v'~ chssific.ado~ '~ NFS, Fl, F2, F3, F4, see "Soft Classification
-[, <~urc of soil -- An e.gincering classification of the soils by particle
~il~--~---~r~poruon: see "Soil Cl~sslfication Ch~r~", note thc
p.%mttio.s arc approxlmdte and m.di[ic~cions to the soil group due to
s-:~'t'i'~t"n mdusionsand ch~nges in properties ~re included'
'-~y~V: o~ I~ttle appdrcm snrfacc moisture,
~p m~.i~mrc forms portion ot color, less th~n plastic limit,
~i.'~.~ hc~ wa:e~, often sofh if cohesive soil,
saturated, free ~ater n ay be squeezed out, if~ free draining soil:
~l~c.~t ,,~t~al moisture corneal, if a non-plastic silt or fine
~nd (Thc moisture content is further definedby reference to ~1,
D', si ~ ~t~crs to mme.~)t-less non-cohc;ive soils, such as sand gravel
~ .7~s .oh o~ w.heut a fine frac6on, derived from drilling action
and/or ~ample da~a: o~'. a y described as: vury loose, loose, medium
~:Hffness ~- tefcr~ to more-o~-less cohesive soils and fine grained silts of
~l~-silt groups. Derived dom drill-action and/or s~mple data. Very
sof~. ¥~tt, c~fff, very s~df and bard are commofily used terms.
t~artide siz~ - Thc largest par6cl~ recovered by the split spoon is
i.~.'~gL:~bv tube 3", auger ~igh~s (minute-man) 2", Auger fligh~s
(B-50 holL~ ~tem~ b"8". Large: pi~6cles are described ind~ectly by
action ol :be dfiHb~g an~ arc referred to as cobbles, 3" to 8", or
boulders 8"*, Thecelorc whm~ ~eviewing the gradation shee~s, if ~n),
- H:,: hole log taus: ~c consi~e~e~ for affindicadon of
This is a wo totter code. See Unified
Unified Soil Cl.~s~r~?~ - dcfini.on. In some cases AASHO and or
FAA ~oil d~ssif~cadv-~ m~y be shown as well ~s ~he unified.
fi~te~berg Limits -usctul For fine grained and other plastic sous.
Dh r,~tmM moisture ~onte~t believed to be less th~n phs~ic ~mit
PI~: nat~l moisture content believed to be between plastic ~nd liquid
L~; n~tmal moisture content believed to be greater th~n liquid limit
NP; no~ph~tic, uscml as a modifying description of some silty
Ddatenc~ - is the ..bdity of wa~er to migrate to ~he surface of ~
saturated ar neatly ~aturatcd soil sample when vibrated or jolted -- used
as an aid [o determine if a fine grained soil is a slighdy ot non.plastic
Rock flour - finely ground soil that is not plastic but otber,.v~se
:,irnil~r~ to a clayey silt.
Organic Conical - usually described as Pe~t, PT. scmetime~ include:
~s~t~ partlc~ such as wood/coal, etc, as ~ modal;er to ,m inorgitm~.
soil, Quantity described as; trace, or an estimate of ~oiumc, or, m case
of all organic, - as Peat. This may include tundra, muskeg and brat
material.
Muck ~ a modifier used tn descril~e very sof~, semi.organic
usu~ yoccurlngbelewa peatdepos~
Am..~orphus, c~ - organic particles nearly or f~,!h disl,steg:itted-
Fibrous Peat - crgamc p~rticles more-or-less intac/..
Bottom of Tcsthole includes last sample interval.
Frost Line - sea.nil frost depth as described ~ drdli~ ~dion
~m~'~-s'a~ the t.ne o(
in~ dcscrip[~ot~ of ice content, often will r,:,.v~e mudO~cd
Cl~ssil~cahon for frozen soils -- dos is a sr:c~al cay
permaf[ost
Free Water Level - The f~ee water level n-~ed during.: .~ "g
not ~cessaril~ t~e stout v,'ate~ table ~t thc tbnc r,f dtt ,r a'
~oils requires observation wells o~ [,etomcter m~® o, ~ ! :~t~
special cases.
~1o~16" - The number o[ blov s of a 140 wegbt flee taql'~g 1W' ~'.
advance a 2" split spoon 6"1 the number o( bl:3-'-'s for a 12'~ advance
by definition, tbe ~andard pen~ ~ ~on.
weight, a disturbed s~mple,
~, ddn wMl tube, "Shelby" esed to obtain undisturbed sampl'
of fine g~amed soil,
~,"grab" disturbed sample from auger fllghtsor wall~a~trenc}
~, cut sample, undist,~bed s~mple (tom will of trench.
~ Strength - a useful indicator of a soil's clayey fi ~ction, N~Non
L= ~ow, M'=Medium, ti=High
- T~e sam les ~re placed n o a¢p~rently similar groups
disturbed tes~sincludi"g Attctbc?g Limits, grain si;e. moistu~ed.
reflccl the general distrubed characteristics al the sods ~ssiSi,cd m
group. This Is ~n important phase of ,be soil andysis ~nrl Is
number of quantitative tests necessary to describe the soil m~ss.
SOIL CLASSIFICATION CHART
0
~// /X ' ' y CLAYEY /~ X , t., CLAYEY
SAND ~ [ / ~ANDQ GRAVEL
0 l0 z .... ~ % BY WEIGHT
NONFROST SuscEPTIBLE SOILS ARE INORGANIC SOILS cONTAINING LESSTttAN 3
GROUPS OF [' ROST-SUSCEPTIBLE SOILS;
GRAVELLY SOILS cONTAINING BETWEEN 3AND20% FINER THAN 0.02 mm.
F2 SANDY SOILS coNTAINING BETWEEN 3 AND 15% FINER THAN 0.02 mm.
F3 'a. GRAVELLY SOiLS CONTAINING MORE THAN 20% FINER flIANO~O2mm'ANDSANDYSOILS
(EXCEPT FINE SILTY, SANDS) cONtAINING MORE TllAN 15% FINER Tt4&f4002
b, CLAYSW~TI4 pLASTICITY INDEXESOF MORE THAN t2. EXCEPT vARVEDCLAYS.
F4 a. At;LSILTS iNCLUDING SANDY SILLS.
b. FINE SILTY sANOSCONTAINING MORE~HAN t5% FINER THAN 0.02 mm.
c t CAN CLAYS WFPt PLASTICITY INDEXESOF LESSTFIAN ]2'
.d. VARVED CLAYS.
'
_