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22. S-4401 - ALLEN SUBDIVISION, I. OTS I THRU - The Munici aliu of '
~niu iOUr lOiS. Ti~e pcii{ion area is {~,~ ...... /i~..-~ ~?proximalcly .~ acres from one Io{
The plat was approved subject to:
1. Resolving ut{l{ty easements ~{th CEA, ATU, 4 Gas Co.
2. Resolving so{1 test ~ith DHEP.
3. Entering into a subdtv{s{on agreement for {mprovements to ll2th
And ~nge Street.
4. Apply{ng for and receZv{ng var{ance for side yard ~etback from
the Zoning Board of Examiners and A~peals.
ENVIRONMENTAL SANITATION: PUBLIC WATEB NOT AVAILABLE
PUBLIC SEWER NOT AVAILABLE TO SERVICE PETITION AREA.
ENVIRONMENTAL ENGINEERING:
71014 (9/76)
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
October 12, 1977
W.O. #D9985
Grid #2634
Mr. George Allen
6209 Chevigney Drive
Anchorage, AK 99502
Subject:
Subsurface Investigation for proposed
Allen Subdivision
Dear Mr. Allen:
The followin~ is a follow-up of our April 15, 1977 report
for the proposed Allen Subdivision. That investigation
consisted of two test holes and two percolation tests. As
noted in that report, the per6olation rates obtained in the
earlier investigation were considerably slower than usually
observed for similar soils. At that time we noted that the
rates may be excessively conservative and recommended addi-
tional percolation tests.
This report covers the following:
a. An additional test hole was drilled to check the con-
tinuity of soils.
b. The percolation test on holes #1 and #2 were rerun.
Included in this transmittal is:
~Vicinity Map
Test Hole Location Sketch
Test Hole Log
Explanatory Information
Previous Report
Figure 1
Figure 2
Table A
Sheets 1-3
Appendix A
The investigation for the latest phase of exploration was
conducted July 27 and 28, 1977. One 17' deep test hole was
drilled using a solid stem auger. Samples were taken at
each change in soil type. The drilling rig is owned and
operated by Denali Drilling, Inc. Drilling was supervised
and the test holes logged by Mr. David Tobey, technician
with Alaska Testlab. Table A is a log of s test hcle reflecting
visual observations and classifications.
Based on the additional test hole, subsurface conditions
appear similar to that encountered in the other two holes.
Predominant unified classification was GP with ~.~, SP, GM,
and S~ soils also encountered.
Mr. George Allen
October 12, 1977
Page 2
When the percolation tests were rerun,.the method as recommended
by the Municipality of Anchorage Department of Public Health
and Environmental Protection was used. For the second
trial, results were as follows:
Test Hole ~1 - 4.7 minutes/inch
Test Hole #2 - 11.4 minutes/inch
The logs of test holes #1 and #2 are included in the previous
· report (Appendix A).
No free water was observed in any of the holes at the time
of drilling.
We. trust the results clarifies the subsurface conditions for
this project. If there are any questions or if we can be of
further assistance, please do not hesitate to contact us.
Very truly yours,
~.~Mark Hanse~n ~
RMH: rb
Enclosures
' R~ Le~,
CAMPBELL AIRS1
Id
FIG. !
50'W
2.99.95
I
49.496 s.f.
N 89°58' 50'w
299.9}
TH2Q ~
2
49~4~5~f.
· ,~. ',T:.H.A
N 89°58'50' W
Z99.91
;5
49,499s. f.
N 89°58' 50"W
1519.49
299.89
4 0'5~j.~f' T H
299.87
/
329.87
E
25
oo
'2
5O
I--
IIZ th
AVE.
S
Test Hole ~A
Table A
WO #D9985
Logged By: D. Tobey
Date: 7-27-77
Depth in Feet
From To
0.0' - 0.4'
0.4' - 2.0'
2.0' - 3.0'
3.0' - 6.0'
6.0' - 7.2'
7.2' - 9.0'
9.0' - 10.0'
10.0' - 11.0'
11.0' - 11.7'
11.7' - 12.7'
12.7' - 17.0'
Soil Description
Organics and wood.
F-4, tan Gravelly Silt, ML, with roots, medium
density.
NFS, brown Gravelly Sand, SP, coarse grained,
with roots, damp, high density, subrounded
particles to 1".
NFS, brown Sandy Gravel, GP, contains roots,
medium to high density, subrounded particles
to 6".
NFS, ~rey Sand, SP, medium and fine grained,
damp, dense.
NFS, brown Sandy Gravel, GP, many cobbles, damp,
dense.
F-2, brown Silty Sand, SM, fine grained, damp,
dense.
I]FS, brown Sandy Gravel, GP, gap graded, con-
tains medium and fine sand, damp, dense.
F-l, brown Silty Sandy Gravel, GM, damp.
NFS;F-2, layered Silty Sand, SM and Gravelly
Sand, SP.
NFS, brown Gravelly Sand, SP, few cobbles
and boulders, damp, dense, subrounded particles.
Bottom of Test Hole:
~rost Line:
Free Water Level:
17.0'
None Observed
None Observed
~ample Dept~
1 2.0'
2 3.0'
3 3.8
(Continued)
Blows/6"
M%
9.7
2.8
1.0
Type of
S.ample.
G
G
G
Dry
Strength
N
N
N
Group
A
C
C
unified
SM
GW
GP
Test Ilole #A
W.O. #9985
Sample
4
5
6
7
8
9
10
11
12
Depth
4.8'
6.0'
7.2'
9.0'
9.5'
11.0'
11.5'
12.5'
17.0'
Blows/6" M%
Type of Dry
~ample Strength Group
Unified
1.6 G N C GP
2.9 G N C GP
5.9 G N B SP
3.0 G N C GP
13 . 9 G N D SP-SM
2.6 G N E SW
2.3 G N F GP-GM
5.9 G N D SP-SM
3.0 G N · E GW
Remarks:
®
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.
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
April 15, 1977
W.O. 9985
Grid: 2634
Mr. George Allen
c/o DOWL Engineers
4040 "B" Street
Anchorage, AK 99503
Attention:
Mr. M.P. Oswald
Subject:
Subsurface'Investigation Proposed
Allen Subdivision
G~ntlemen:~ ·
Transmitted herein at the request of Mr. Oswald of DOWL
Engineers are the results of subject investigation for the
project in BLM Lot 24, Section 21, Township 12 North, Range
3 West, Seward Meridian, Alaska. The data is organized as
follows:
Vicinity Map
Test Hole Location Sketch
Test Hole Logs
Explanatory Information
Figure 1
Figure 2
Table A
Sheets 1'3
The exploration was conducted April 8, 1977 and consisted of
two test holes, each 16 feet deep. The scope of the explora-
tion is to determine the suitability of the site for on-site
sewage systems. For the test holes, a Nodwell mounted B-50
drill°rig equipped with a continuous flight solid stem auger
was used. The rig is owned and operated by Dena!i Drilling
Inc. Drilling was supervised and the test holes logged by
Mr. Terry Barber, geolcgist with Alaska Testlab. Table A
is the log of the test holes reflecting field observations
and visual classifications.
When drilling was completed, a slotted plastic pipe was
inserted in each hole to aid in determining the water level.
For the percolation tests the holes were filled with water
and left overnight to saturate. On returning the next day,
each hole was refilled with wa~cr and the drop in the water
level carefully monito]~ed over the next 60 minutes. Using
this procedure, ~hich is reco~u~ended by thc Municipality of
Anchorage Dept. of Public ~!calth and Env~ronmenta! Protection,
observed minimum percolation raues were as follo~;s:
Mr. George Allen
April 15, 1977
Page 2
Test Hole 1
Test Hole 2
7'.3 minutes per inch
17.1 minutes per inch
These rates are considerably slower than usually observed in
similar soils, and may be excessively conservative. Addi-
tional percolation tests after subdivision approval, but
before construction of homes are recommended in order to
· establish a reasonable design value..
No free water level was observed during exploration. It
should be noted'though the-free water level usually fluctuate~
seasonally and with precipitation.
We trust the foregoing is sufficient for yoUr present needs.
Should questions arise or if we can be of further service,
please contact us.
Very truly yours,
APPROVED:
Melvin R. Nichols, PE
Laboratory Manager
ALASKA TESTLAB
R. Mark Hanson
RMH: mfm
Attachments
.i ] !
!
Imm
" CAMPSEI. L
FIG.
VICINITY ~..'~P
,4
.?0:2~
50"W
S89;58'50'E 329 95
299.95
q ! ~4
~ 49,496 s.f. -~
N 89°58'50'W
299.93
N
o. 2 , · ~
~ 49,493~f. ~_
N 89°58'50"W
299.91
49,499s. f.
N 89°58' 50"W
299.89
4
4005~f. TH I
299.87
1319.49
329.87
I V/DED
E
~o
liP. th AVE.
F
~I -/ A
S~ £FK £/~
SUBD.
TEST IlOLE I,OCAI'ION 5ki!1'Cll FIG. 2
Test Hole No. 1
Depth in Feet
From To
0.0 1.5
1.5 3.0
3.0 6.0
6.0 12.0
12.0 16.0
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO.
Depth
2.5'
2 5.0'
3 10.0'
4 16.0'
Date
Logged by:
TABLE ..A
4-8-77
T. Barber
W0~9985
SOIL DESCRIPTION
F-2, brown Gravelly Silty Sand, SM, mixed with
Peat, damp, low density.
F-2, b~own Gravelly Silty Sand, SM, damp, medium
density.
NFS/F-2, brown Sand, SP-SM, fine to medium grained,
damp, medium density.
NFS/F-l, brown slightly Silty Sandy Gravel, GP-GM,
damp, medium density, subrounded and rounded
particles to 1-1/2".
NFS, brown medium Sand, SP, with trace gravel,
damp, medium density.
16.0 ft.
0.0-1.0 ft.
None observed while drilling
Type of
Sample
Unified
Classification
Grab SM
Gr ab SP- SM
Grab GP-GM
Grab SP
.Remarks:
2)
3)
4)
Visual Classification Only
General Information, see Sheet 1
Frost & Textural Classification, see Sheet 2
Unified Classification, see Sheet 3.
Test Hole No. 2
Depth in Feet
From To
0.0 1.5
1.5 .5.5
5.5 11.0
11.0 16.0
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth
I 5.0'
2 10.0' '
3 16.0'
TABLE A
'SoIL/DEscRIPTION
Date.
Logged by:
4-8-77
T. Barber
WOf9985
F-4, brown Sandy Silt, ML-OL, mixed with
Peat, wet, soft.
F-4, brown Sandy Silt, ~, damp, soft to 3.5',
stiff below 3.5;, NP, trace gravel at 4.5'.
NFS/F-2, brown slightly Silty Sandy. Gravel,
GP-GM, damp, subrounded and rounded particles 2"+.
F-4, brown Gravelly Sandy Silt, ML, wet, stiff.
16.0 ft.
None observed
None observed while drilling
Type of Unified ~
Sample Classification
Grab ~
Grab GP-GM
Grab ML
Remarks: 1)
2)
· 3)
4)
Visual Classification Only
General Information, see Sheet 1
Frost & Textural Classification, see Sheet 2
Unified Classification, see Sheet 3.
0.0' '- 0.5'
0.5' - 6.0'
6'0~ - 7.0'
7.0' - 18.0'
Bottom of Test Ho/e:
Fzee Water Level:
_s_ ~tion
Brown Po_at Pt wet soft.
F-l, brown Si] tv,
Z.'-9 brown S:i~t.~ .... SN, dami~, m,~ciium
dells/ ry. .......
F-2/NFS, brown si iqhtIy Silty
medium donsi ry. .... SH, damp,
18.0'
None Observed
None Observed
.,4
.!
299.89
_2. 4op~r. H
299.87
[g
.o 32'9.87
J/ I
3O
112 Ih
=o I
I
.I
I
I
I
'1
'r.
A-lA
AVE.
S IEFKER
SUL~ D.
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
PLATTING OR PLANNING AND ZONING CASE REVIEW
.CASE NUMBER S-4401
PETITION FOR
DATE RECEIVED
COMMENT TO PLANNING BY
REZONING OF
SPECIAL EXCEPTION
VACATION
R E.~UBDIVISION
April'.,21, 1977
COMMENTS:
Allen Subd BLM Lt 24~ Sec 21 T12N R3W SM. Ak
containing 5 acres
FOR MEETING OF May 5, 1977
ENVIRONMENTAL SANITATION: PUBLIC W,~:['~ER NOT
AVAILABLE
of Cases
,. ~ ~ ,.~ PUBLIC SEWER ~'OT /~,V..,AILABLE TO SERVICE PETITION AREA.
ENVIRONMENTAL ENGINEERI~/~:'~''~
71-014 (9/76)
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
April 15, 1977
W.O. 9985
Grid: 2634
Mr. George Allen
c/o DOWL Engineers
4040 "B" Street
Anchorage, AK 99503
Attention:
Mr. M.P. Oswald
Subject:
Subsurface Investigation Proposed
Allen Subdivision
Gentlemen:
Transmitted herein at the request of Mr. Oswald of DO~
Engineers are the results of subject investigatien for the
project in BLM Lot 24, Section 21, Township 12 North, Range
3 West, Seward Meridian, Alaska. The data is organized as
follows:
Vicinity Map
Test Hole Location Sketch
Test Hole Logs
Explanatory Information
Figure I
Figure 2
Table A
Sheets 1-3
The exploration was conducted April 8, 1977 and consisted of
two test holes, each 16 feet deep. The. scope of the explora-
tion is to determine the suiuabili=y of the site for on-site
sewage systems. For the test holes,, a Nodwell mounted B-50
drill rig equipped with a ccntinuous flight solid stem auger
was used. The rig is owned and operated by Denali Drilling
Inc. Drilling was supervised and the test holes logged by
Mr. Terry Barber, geologist with Alaska Testlab. Table A
is the log of the test holes reflecting field observations
and 'visual classifications.
When drilling was completed, a slotted plastic pipe was
inserted in each hole to aid in determining the water leVel.
For the percolation tests the holes were filled with water
and left overnight t~ saturate. On returning the next day,
each hole was refilled with water and the drop in the water
level carefully monitored over the next 60 minutes. Using
this procedure, which is recommended by 'the Municipality of
~lchorage Dept. of Public Health and Envircnmental Protection,
observed minimum percolation rates were as follows:
Mr. George Allen
April 15, 1977
Page 2
Test Hole 1
Test Hole.2
7.3 minutes per inch
17.1 minutes per inch
These rates are considerably slower than usually observed in
similar soils, and may be excessively conservative. Addi-
tional percolation tests after subdivision approval, but
before construction of homes are recommended in order to
establish a reasonable design value.
No free water level was observed during exploration. It
should be noted though the free water level usually fluctuates
seasonally and with precipitation.
We. trust the foregoing is sufficient for your present needs.
Should questions arise or if we can be of further service,
please contact us.
Very truly yours,
AP P ROVE D:
Melvin R. Nichols, PE
Laboratory Manager
ALASKA TESTLAB
· R. Mark Hansen
RMH:mfm
Attachments
CAMPBELL AIRS1
FIG. 1
VICINITY ~t~
589°58'50'E 3a9.95
299.95
. TH2~ ~
o. i
~ 49,496 ~f.
N 89°58' 50'W
Z99.9~
2
49,493s. f.
N 89°58'50"W
299.91
49,499~f. _~
N 89°58' 50"W
299.89
299.87
50"W
1319.49
329.87
3o
i/
]
J
I-
112 th AVE.
J - lB
S IEFKEI-
TEST HOLE LOCATION SKETCH FIG.2
Date:
Logged by:
4-8-77
T. Barber
Test Hole No 1
Depth in Feet
From To
0.0. 1.5
1.5 3.0
3.0 6.0
6.0 12.0
12.0 16.0
TABLE -A
WO%9985
SOIL DESCRIPTION
F-2, brown Gravelly Silt~ Sand, SM, mixed with
Peat, damp, low density.
F-2, brown Gravelly Silty Sand, SM, damp,.medi~L]
density.
NFS/F-2, brown Sand, SP-SM, fine to medium grained,
damp, medium density. ..
NFS/F-l, brown slightly Silty Sandy Gravel, GP-.GM,
damp, medium density, subrounded and rounded
particles to 1-1/2"
NFS, brown medium Sand, SP, with trace gravel,
damp, medium density.
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth
1 2.5'
2 5.0'
3 10.0'
4 16.0'
16.0 ft.
0.0-1.0 ft.
None observed while drilling
Type of Unified
Sample Classification
Grab SM
Grab SP-SM
Grab GP-GM
Grab SP
Remarks:
1)
2)
3)
4)
Visual Classification Only
General Information, see Sheet 1
Frost & Textural Classification, see Sheet 2
Unified Classification, see Sheet 3.
Date:
Logged by:
4-8-77
T. Barber
Test Hole No. 2
Depth in Feet
From To
0.0 1.5
1.5 5.5
5.5 11.0
11.0 16.0
TABLE A
WO99985
SOIL DESCRIPTION
F-4, brown Sandy Silt, ML-OL, mixed with
Peat, wet, soft.
F-a, brown Sandy Silt, ML, damp, soft to 3 5'
stiff below 3.5', NP, trace gravel at 4.5'.
NFS/F-2, brown slightly Silty Sandy Gravel,
GP-GM-, damp, subrounded and rounded particles 2"+.
brown Gravelly Sandy Silt, ML, wet, stiff.
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth
1 5.0'
2 10.0'
3 16.0'
16.0 ft.
None observed
None observed while drilling
Type of
Sample
Unified
Classification
Grab ~
Grab GP-GM
Grab ML
Remarks:
1)
2)
3)
4)
Visual Classification Only
General Information, see Sheet 1
Frost & Textural Classification, see Sheet 2
Unified Classification, see Sheet 3.
Test Hole Lo~l - 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 m soil type was observed through drill action, direct
observation or sampling.
Frost Classification - NFS, Fl, F2, F3, F4, see "Soil Classification
Chart"
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 to
stratification, inclusions and changes m properties are included.
Moisture Content - this is a qualitative measure:
dr._~v, ,,, 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. if a free draining soil;
dilatent at natural moisture content, if a non-pla~stic silt or fine
sand. {The moisture content is further definedby 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-tess cohesive soils and fine grained silts of
t-~ clay-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
1-318", Shelby tube Y', auger flights (minute-man) 2", Auger flights
(B-SO hollow stem) 6"-8". Larger particles are described indirectly by
action of the drilling and are referred to as cobbles, 3" to 8", or
boulders 8"+. Therefore whe, 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 for 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 oiher plastic softs.
PI; natural moisture content believed to be less than plastic limit
P}+; natural moisture content believed to be between plastic and liquid
limits
L_.~; natural moisture content believed to be greater than liquid limit
· NP; non-plastic, useful as a modifying description of some silty
~t~riah.
.Dilatenc.v - is the ability of water to migrate to the surface of a
saturated or nearly saturated soil sample when vibrated orjohed -- 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
~ 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
us-'i~Trly occuring below a peat deposit.
Amorphus ]peat - organic particles nearly or fully 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 m
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, the standard penetration.
,,4% - natural moisture content of the soil sample, usually not
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 140 pound
weight, a disturbed sample,
S, thin wall tube. "Shelby" used to obtain undisturbed samples
of fine grained soil,
C, "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
Group - The samples are placed into apparently similar groups based
on color and texture and are arbitrarily assigned a group, tter. Further
'disturbed tests including Atterberg Limits, grain size. moisture~lensicy
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
SAND
0 10
LAYEY CLAYEY
CLAYEY ~
OR SILT SILTY
SAND GRAVELLY SAND SANDY'GRAVEL
# \/ ~ \.t
\ /\ / '/
GRAVELLY SAND / SANDY GRAVEL
\ \/
20 30 40 50 60
GRAVEL (+=4 SCREEN) % BY
CLAYEY
OR
SILTY
O
GRAVEL
GRAVEL
\
70 80
WEIGHT
9O
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 SANDYSIL
b. FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
c. LEAN CLAYS WITH PLASTICITY NDEXESOF LESS THAN 12.
d. VARVED CLAYS.
1uO
ALA
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
October 1'2, 1977
W.O. ~D9985
Grid ~2634
Mr. George Allen
6209 Chevigney Drive
Anchorage, AK 99502
Subj oct:
Subsurface Investigation for proposed
Allen Subdivision
Dear Mr. Allen:
The following is a follow-up of our April ~5, ~977 report
for the propose~ Allen Subdivision. That investigation
consisted of two test holes-and t;.,o percolation tests. As
noted in that report, the percolation rates obtained in the
earlier investigation were considerably slower than usually
ob.~;ervei for similar soils. AL that time we noted that the
rates may be excessively conservative and recommended addi-
tional percolation tests.
This report covers the following:
An additional test hole was drilled to check the con-
tinuity of soils.
b. The percolation test on holes {!~ and ~2 were reruns.
Included in this transmittal is:
Vicinity Map
Test Hole Location Sketch
Test Hole Log
Explanatory !nformauion
Previous Report
Figure 1
Figure 2
"~le A
Sheets 1-3
Appendix A
The investigation for thc latest phase of exploration was
conducted July 27 and 28, ~977. One ~7' deep test hole was
[~rilled using a solid stem aug{~r. Sampie~ were taken at
each change in soil type. The drilling rig. is owned and
operated by Denaii '~ri.~ ~''~ lnc Drill mng was su~}ervised
and the test holes logged by Mr. David 'J'ebey, tectmician
with Alaska Testlab. Table A is a leg of a test hole reflecting
visual observations and clr~ssifications.
Based on the additional test hole, ~u.Ssurface conditions
appear similar to that encounl~cred in the other two holes.
Predomi~ant unified classification was {;? with GW, SP, GM,
and SM soils also encoun~ered.
.Mr. George Allen
October. 12, 1977
Pa~e 2
When the percolation tests were rerun, the method as recommended
by the Municipality of Anchorage Department of Public Health
and Environmental Protection was used. For the second
trial, results were as follows:
Test Hole #1 - 4.7 minutes/inch
Test Hole ~2 - 11.4 minutes/inch
The logs of test holes ~1 and ~2 are included in the previous
repo[t (Appendix A) .
No free water was observed in any of the holes at the time
of drilling.
We trust the results clarifies the subsurface conditions for
this project. If there are any questions or if we can be of
further assistance, please do not hesitate to contact us.
Very truly yours,
Po~H: rb
Enclosures
APP~OVE[~_
Date:
Logged by:
8-77
%'. Barber
Test Hole No. 1
Depth in Feet
From To
0.0 I .5
1 .5 3.0
3.0 6.0
6.0 12.0
12.0 16.0
TABLE A
WO#9985
SOIL DESCRIPTION
F-2, brown Gravel.l~. Silty. Sand, SM, mixed with
Peat, damp, low density.
F-2, brown Gravelly. Silty Sand, SM, damp, medium
density.
NFS/F-2, brown Sand, SP-SM, fine to medium grained,
damp, medium density.
NFS/F-l, brown slightly Silt,f. Sand~ Gravel, GP-GM,
damp, medium density, subrounded and rounded
particles to 1-1/2" ..
NFS, bro~.+n medium Sand, SP, ~ith trace gravel,
damp, medium density.
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO.
Depth
2.5'
5.0'
10.0'
16.0'
3
16.0 ft.
0.0-1.0 ft.
None observed while drilling
Type of Unified
Sample Classification
Grab SM
Grab SP-SM
Grab GP-GM
Grab SP
Remarks:
1)
2)
3)
4)
Visual. C].assification Only
General Information, see Sheet
Frost & Textural C].assification, see Sheet 2
Unified Classification, see Sheet 3.
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