HomeMy WebLinkAboutSILVER CREST Soils/,4
L
Mr. Dean Thompson
3742 W. 79th Avenue
Anchorage, AK 99502
4040 "B" STREET, �� a
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
February 15, 1977
W.O. #17966
Grid #2439
Subject: Subsurface Investigation Tract B -1A,
Nettleton Acres Subdivision
Dear Mr. Thompson:
Transmitted herein are the results of the subsurface investiga-
tion of the above mentioned property, located in the northeast
quarter of Sec. 14, T. 12 N, R. 3 W, S.M. Alaska. The data
is organized as follows:
Vicinity Map Figure 1
Test Hole Location Sketch Figure 2
Test Hole Logs Table A
Explanatory Information Sheets 1-3
Grain Size Distribution Curves Sheets 4-6
Idealized Soil Profiles Figures 3-5
Subsurface exploration was conducted on February 7 & 8,
1977 and consisted of eight test holes, sixteen feet deep.
Samples consisted of twenty-three "grab" samples taken from
the auger flights. The approximate locations of the test
holes are shown on Figure 2. Table A is a log of these test
holes reflecting field observations and visual classifications
as well as quantitative and qualitative laboratory analysis.
The exploration was conducted using a Nodwell mounted Mobile
Drill B-50 drill rig equipped with a continuous flight,
solid stem auger. 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.
As the samples were recovered they were sealed in plastic
bags for transportation to the laboratory. In the laboratory,
samples were visually classified and the moisture content
and dry strength determined. For easy reference samples of
similar color, texture and particle size distribution were
given an arbitrary group designation. Grain size analysis
was performed on composite samples on selected groups.
Five general soil types were encountered and are listed
below by their group designations for reference to the test holes:
f
Mr. Dean Thompson
February 15, 1977
Page 2
Group A is a brown gravelly sandy silt. This group is
highly frost susceptible being rated F4. Unified
classification is SM. This group is non -plastic.
Group A included five samples.
Group B is a brown sandy silt. This group is highly frost
susceptible being rated F4. Unified classification
for the composite group sample is SM. However,
with 490 of the composite sample passing the #200
sieve., this is a border line group with individual
samples within a group having unified classifications
of SM and ML. Group B is non -plastic and sometimes
contains subrounded or rounded gravel particles.
Group B included eight samples.
Group C is a brown silty sand. This group is moderately
`T frost susceptible being rated F2. Unified classifica-
tion is SM. Group C is distinguished from Groups A
and B by a significantly lower fines (-4200)
content. Group C includes five smaples.
Group D is a brown silty sandy gravel. This group is
moderately frost susceptible being rated F1.
Unified classification is GM. Group D includes
two samples.
Group E is a brown sandy gravel. This group is non -frost
susceptible being rated NFS. Unified classification
is GP or GW. Group E was encountered only in test
hole #B and includes two samples.
The soil gradation shown on the attached grain size distribu-
tion curves are for composite disturbed samples and do not
reflect stratification which causes the soil to be more or
less sorted in the field. Particles larger than about two
inches are not recovered by the auger flights thus particular
attention should be called to the test hole logs when reference
is made to cobbles for they will not be reflected in the
sample.
When drilling was completed a 3/4' slotted PVC pipe was
inserted in the hole to aid in determining the free water
level. For the percolation test, the test hole was filled
with water and left overnight to saturate. On returning the
next day, the hole was refilled with water and the drop in
the water level carefully monitored over the next 60 minutes.
This procedure is not a standardized percolation test,
however, we understand that the Municipality of Anchorage,
Department of Public Health and Environmental Protection
prefers tests performed in this maner to evaluate a site for
a proposed on-site sewerage system.
Mr. Dean Thompson F4 it
February 15, 1977
Page 3
Using the above test, the observed minimum percolation rate was 7
minutes/inch for Test Hole #1 and 3 minutes/inch for Test Hole #6.
Percolation tests have been erformed on Test Holes --#6m
only. A 3/_4'slotted PVC pipe was left in each test hole for
future percolation tests and to facilitate measurement of the
water level. A water level measurement was made in the holes
approximately twenty-four hours after drilling was completed. The
water levels given on the logs should be used with caution, however,
since the area was subject to run off during the time of explora-
tion. Water levels measured on February 18, 1977 (about 10 days
after drilling) were as follows:
Test Hole Depth to Water
#1
8.0'
#2
2.7'
It
7.0'
#n
3.0'
#5
8.0'
06
None Observed
#7
None Observed
#8
None Observed
There was no runoff observed when those water depths were measured,,
but the depths will probably vary seasonally as precipitation and
runoff varies, and these depths may have been influenced by recent
runoff.
The idealized soil profiles (Figures 3-5) are schematic only and
have great vertical exaggeration. Soils information is extrapolated
between holes and may not be accurate except at the actual test
hole locations.
We trust the foregoing is sufficient and meets your present needs.
Should questions arise or if we can be of further service, please
do not hesitate to contact us.
Very truly yours,
ALASKA TESTLAB
ell
P
R. Mark Hansen
Approved:
Rej'vi_'n R. Nichols, PE
Laboratory Supervisor
RMH/ge/mm
Attachments
-�,;.. �. /_ Qac„. /�`'� � '�w/ -�i
- r-4
Logged,. -,,By: T. Barber
'e: •2/7/77
Test Hole #1 Table A WO #17966
Depth in Feet
From To Sail Description
0.0 1.5 F--4, brown sandy silt, ML, with roots and organics.
t'!3v oI aya0
1.5 15.5 F-4, brown slightly gravelly sandy silt, S11, al.1
sand sizes, dry to damp, low to medium density,
density increases with depth, subrounded and
rounded particles to 1/2". Group A and B.
Pe— kc, - 7 m //V /I c'!-4
Bottom of Test Hole: 15.5'
Frost Line: None Observed
Free Water Level: None Observed While Drilling
13.5 After 24 -hr.
Type of Dry
Sample
Depth
Blows/6" Mo Sample Strength
Group Unified
1
5'
11.4 G N
A SM
2
10'
12.6 G M
B SM/ML
3
15'
7.7 G N
A SM
Remarks:
1.
Type of Sample, G=Grab, SP = Standard
Penetration,
U = Undisturbed.
2.
Dry Strength, N=None, L=Low, M=Medium,
H=High.
3.
Group refers to similar material, this
study only.
4.
General Information, see Sheet 1.
5.
Frost and Textural Classification, see
Sheet 2.
6.
Unified Classification, see Sheet 3.
i ,-
Logg By: T. Barber
Date: 2/7/77
Test Hole #2 Table A WO #17966
i
Depth in Feet
From To Soil Description
0.0 1.0 F-4, brown sandy silt, ML, with roots and organics.
1.0 4.0 F-4, brown slightly gravelly sandy silt, SM, few
cobbles, damp, low to medium density, Group A.
4.0 13.0 F-4, brown sandy silt, SM, trace gravel, all sand
sizes, damp to saturated, low to medium density,
Group A.
AC 1
Bottom of Test Hole: 13.0'
Frost Line: None Observed
Free Water Level: 12.5' While Drilling
2.0' After 24 -hr.
Type of Dry
Sample Depth Blows/6" M% Sample Strength Group Unified
1 5' 9.9 G L A SM
2 10' 10.1 G L A SM
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low,, M=Nledium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Type of Dry
Logged. --By: T. Barber
t
Depth
Blows/6" Mo Sample Strength
-e: 2/7/77
i
Test
{
Hole #
Table
A WO #17966
Depth
in Feet
8.2 G N_
A SM
From
To
4.8 G N
Soil Description
0.0
2.0
F-4, brown
sandy silt, ML, with roots and organics,
damp, soft,
NP.
2.
Dry Strength, N=None, L=Low, M=Medium,
L115"'.1 „'
2.0
10.0
F-4, brown
slightly gravelly sandy silt., SM, all
4.
sand sizes,
damp, medium density, NP, particles
5.
to 1-1/2",
gravelly at 6', cobble at 12',
6.
Groups B and
A.
10.0
16.0
F-2, brown
silty gravelly sand, SM, all sand
sizes, damp,
17edium density.
6
1* C-- —I'
Bottom
of Test Hole:
16.0'
Remarks: Surface water
intrusion
Frost
Line:
None
Observed
Free
Water Level:
None
Observed While Drilling
14.8'
After 24 -hr.
Type of Dry
Sample
Depth
Blows/6" Mo Sample Strength
Group Unified
1
3.5
1.4.4 G N
B SM/ML
2
8.5
8.2 G N_
A SM
3
16.0
4.8 G N
C SM
Remarks:
1.
Type of Sample, G=Grab, SP = Standard
Penetration,
U = Undisturbed.
2.
Dry Strength, N=None, L=Low, M=Medium,
H=High.
3.
Group refers to similar material, this
study only.
4.
General Information, see Sheet 1.-
5.
Frost and Textural Classification, see
Sheet 2.
6.
Unified Classification, see Sheet 3.
Test Hole #4
Depth
in Feet
From
To
0.0
1.0
1.0
5.0
5.0 10.0
10.0 16.0
Bottom of Test Hole
Frost Line:
Free Water Level:
Logged -,By: T. Barber
.e: .2/7/77
Table A WO #17966
Soil Description
F-4, brown sandy silt, ML, with organics.
F-4, brown gravelly sandy :gilt, SM/ML, contains
fine and medium sand, wet, medium density, NP,
Group B.
F-4, brown sandy silt, SM/ML, contains fine and
medium sand, damp, stiff, NP, cobble at
Group B.
F-4, brown slightly gravelly sandy silt, SM/ML,
all sand sizes, stiff_, NP, Group B.
O t ' ----, -e C. Reel ei l f
16.0' Remarks: Surface water
intrusion
None Observed
None Observed While Drilling
14.2' After 24 -hr.
Type of Dry
Sample
Depth
Blows/6" IM Sample Strength
Group
Unified
1
3,5
15.3 G M -H
B
SM/ML
2
10.0
10.5 G N
B
SM/ML
3
16.0
11.5 G N
B
SM/ML
Remarks:
1.
Type of Sample, G=Grab, SP = Standard
Penetration,
U = Undisturbed.
2.
Dry Strength, N -None, L=Low, M=Medium,
H=High.
3.
Group refers to similar material, this
study
only.
4.
General Information, see Sheet 1.
5.
Frost and Textural Classification, see
Sheet
2.
6.
Unified Classification, see Sheet 3.
Test Hole #5
Depth in Feet
From To
0.0 4.0
4.0 16.0
Logged, 13y: T. Barber
2/8/77
Table A WO #17966
Soil Description
F-2, bro,-,n very silty sand, SM, all sand sizes,
damp to wet, top l' soft, Group C.
F-4, brown gravelly sandy silt, SM/ML, all sand
sizes, wet to damp, stiff, particles to 1-1/2",
cobble at 8.5', Group B.
Bottom of Test Hole: 16.0'
Frost Line: None Observed
Free Water Level: None Observed While Drilling
9.7' After 24 -hr.
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.
Type of
Dry
Sample
Depth
Blows/6" Mo
Sample
Strength Group Unified
1
3.0
14.1
G
N C SM
2
8.0
15.3
G
L B SM/ML
3
16.0
13.1
G
N B SM/ML
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 #6
Depth
in Feet
Type of
From
To
Sample
0.0
1.5
1.5
16.0
Logge— By: T. Barber
_Ate: 2/8/77
Table A WO #17966
Soil Description
F-4, brown sandy silt, ML, with peat, roots, wood.
F-1, brown silty sandy gravel, GM, damp to�wet,
medium to high density, cobble at 5', subrounded
and rounded particles, maximum size 2"+, Group D.
P,*- p4 d r )/ 1 -
Remarks: Surface water
Bottom of Test Hole: 16.0' intrusion. Sample #1 not
representative.
Frost Line: None Observed
Free Water Level: None Observed While Drilling
Trace After 24 -hr.
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Type of
Dry
Sample
Depth
Blows/6" Mo
Sample
Strength
Group
Unified
1
4.0
8.2
G
N
C
SM
2
8.0
7.3
G
N
D
GM
3
16.0
9.1
G
N
D
(-.I'M
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
n. Logged._ By : T. Barber
__te: 2/8/77
Test Hole #7 Table A WO #17966
Depth in Feet
From
To
Soil Description
0.0
1.0
F-4, brown sandy silt, ML, with
peat, roots, wood.
1.0
5.0
F-4, brown gravelly sandy silt,
SM/ML, all sand
sizes, damp, soft to stiff, NP,
raxium size 3/4",
GroupB.
5.0
11.0
F-2, brown silty gravelly sand,
SM, all sand sizes,
damp, medium density, particles
to 1-1/2", contains
gravel layers, Group C.
11.0
16.0
F-2, brown very silty gravelly
sand, SM, fine and
medium sand, damp, particles to
3/4", Group C.
Bottom
of Test Hole:
16.0'
Frost
Line:
None Observed
Free Water
Level:
None Observed After 24 -hr.
Type of Dry
Sample
Depth
Blows/6" M% Sample Strength Group Unified
1
4.0
12.9 G L -N
B SM/ML
2
10.0
11.0 G L -M.
C SM
3
16.0
9.8 G N -L
C SM
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U ` Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Test Hole #8
Depth
in Feet
Type of
From
To
Depth
Blows/6" Mo
0.0
1.0
1.0
16.0
Table A
Loge; ed-- By : T. Barber
:e: -2/8/77
WO #17966
Soil Description
F-4, brown sandy silt, ML, with peat, wood.
fj,s��a l � tCeta
NFS/F-1, brown slightly silty sandyrg avel, GP/GW,
low to medium density, Group E.
O �.
Bottom of Test Hole: 16.0' Remarks: Sample #3 not
representative.
Frost Line: None Observed
Free Water Level: None Observed While Drilling
None Observed After 24 -hr.
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
Type of
Dry
Sample
Depth
Blows/6" Mo
Sample
Strength Group Unified
1
4.0
6.9
G
I'' E GP/GW
2
8.0
4.6
G
N E GP/GW
3
16.0
12.8
GL
C SM
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
0
V)
0
�
6
�i
�
4J
co
0
I
<
QzzN
:J
c3
0
LLJ
cz al
Cf)
C)
co
\0
'nD
'o
m
(
C'I
-i
CD
m
0)
0)
00
rl-
m
4J
dw
F-
Cd
U)
.w
>1
C\j
00 0
C)
N
O
<
cn
9�,/
5
w
��
41
V) -4� C)
x
(3) aj
F-4
0
Cf)
C)
co
\0
'nD
'o
m
(
C'I
-i
CD
m
0)
0)
00
rl-
m
dw
F-
N
.w
C\j
00 0
C)
N
O
IH013M Ae U3SUV03 IN30 U3d
0 3 0 0 0 0 0 0 0 0
loor N to co 0 100'
ZOO'ZOO*
rocr 200'
U)
Voo, iroo*
x
goo, GOO*
< z 900• 900'
z - Loan BE
< w 900' ow
G00;
MEMO slololuls, I M 10'
ct:
W z
UJ ct:
mi 11 zcrzo*
0
E0, Olin 20'
va HIM m UtIcr
90' 90'
90' 90'
40'
ooz 00'
00
0 z 08
< Z'
09
OC
ot,
ov
Ld
CL Oz
x
w 0 91
y
LL
In 0 Ld
01
MEMO
MEN Ems
z
w
b�lwl
a
LLJ
> n "A
Lli Z/1
U
0 Z/,
w
O 0 0 0 0 0 0 0 0 0 OZ
0 to W .1 q n 111 —
11{013M AP H:Ml-q IN33 83d
0
E-
)l
m
O
O
cz
WC
-6 cz
V to
M
C�v
O'
c0
LO
O
N
tO
Q 7
00
I
(3)l
'
a
J
Cn
'm
al
Q
00
a
.o
Lo
U)
tti
U
w
�>clict
N
0
0
0
0 0
0
i-)
W
N
C)
�.
.-
M
M
ct
N
ct
N
N
O
�z
O
Cd
w
r
d
�
•�
?
N
+l
0
M
O'
c0
LO
O
N
tO
l�
00
I
(3)l
'
a
'm
al
m
00
1--
.o
Lo
w
�>clict
N
0
0
0
0 0
0
W
N
C)
�.
.-
M
M
ct
N
ct
N
N
O
O
LHCI3AA AB H39NVOO LN30 H3d
O
O �? N h M et fp m O
100'r 1w•
ZOO. wo'
oil£oo £oo'
�
�100O'
118111
X500 Coo'
Q a 900'mum ma 1 9O0'
Q -
LOO'
U) 800 8o0'
,6ME
cc H i 10
W z
F a
W a:
o ZO' ZO.
O
a
O £ O' £0
r
s
60'
80' £A'
90' 90'
oo
oz 90'
r
0
¢ 001'
z 081
a Z.
F
h 09'
N OC
= 0y t"
v
0£
w
" oz
z ,
V) 91
:F w
w
U.
mo w
M oI
J O J
Q X
bi w
N
}w
x
W = Z,,
(n U
i
— I
0 9
Z
of Z 9
w £ 8
N
N b 0)
9
OZ
O O 00 O 0 O 0 O O O
O O V N
L14013At All H3NId 1N30 H3d
.-0
V)
0
u
�:5
Lf)
d
0
U)
0
(D
0)
00111-
CO
fl-
\0
00
-4
o
4-)
C)
�o
LIJ
P, co U)
cz
u
COO
W
a
rte.
4-J
L/3
C-4
C-4
DO
-Z:5
P,
.-0
U)
C)
CD
(D
0)
00111-
CO
fl-
\0
00
-4
�o
COO
W
IH013M AG W368VOO IN33 li3d
0 0 orf 0 0 0 0 0 0 0
0 100'
wo, zoo*
C NY TOO,
voo, Ko,
>- gDo,
< z 900, 900*
Z - Loo,:
w 900' 900'
6 C)
10,
W z
W
F- ;� cc
;E o zor zo,
0
to'
X
to
QO,
90 90*
zo*
ooz 680.
cc
< OOI
a
z 00
ti
09
m
o ot,
oi:�
cL oz
w 91
u -
w
,no w
01 z m
w QJ
_j Mow
z
ul
tv,
w M
>
Lj w Z/1
O
X,
Z/1
o
z
o Z/1 z 09
DOI
oz
o o o O o o ol o o o 0 o 0
co lo IN
IM013M Ml H3flJ:j IN30 L13d
N
a
D
o
•• e
p pe
,fir °®o•®oO° ° o •° °'`•'' m I • w•.
o •ewe • (`�g •° .' Oj
D , 6 Y t� • r
?49.
, `+ • �e
o � •
• ° tn.
� tom' ., •fi
jj e d
flit 1 • • ', °• .
)!�]y)(/+3 °•i°$ �• •PH a °•$p •''.a1 "°r' '.° a
r �� ep •r•i• ••e °d° ° •6� f .s, a^
�� a a,M • ¢ s ,��° , ) s' � "a
e e 6 ° °•
(1 6 p `• e
���� •• i..) a a�,•° p • ° °s s ® � vU o
0
0
u
{
0
a
V,
.• O. r
•
.,
V� O B P a O • d • •
•• • •
• w
f••.'
� neo F °�� ° �� ' • e�'f • Q�
a ji ` 's
I
�3� • IM 4 p
f
•
o
°
` d
a
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
April 5, 1977 MUNICIPALITY OF ANCHORAGE
W.O. #9894 OF 1HEALTH &
ENVIR,i��
NIWZ',,ITAL PIZO,"'CTION
Mr. Dean Thompson and APR"Yr
�Ir. Mike Stephens1977
3742 W. 79th Avenue
Anchorage, AK 99502 RECEIVED
Subject: Phase I Exploration of E)rain F - i -eld Area
Tract B 1A, Nettleton Acres Subdivision
Gentlemen:
included. ToTith-in t -C,.. 4 F, report are the results of our initial
subsurface imiest.-i - gation of the drain field area for your
planned development on the above -referenced Darcel.
Enclosures include:
Test Hole Location Sketch Figure I
Test Hole Lags Table A
Soil Profiles Figures 2-3
Grain Size Distribution Curves Sheets 1-3
Standard Explanatory Information Sheets 4-6
Exploration ,�;as concentrated in the area of -test hole #6
(see our report-- dated February 15, ' 1977). A pattern of test
holes cn a 1010 -foot grid, using test hole #6 as th.e hub, i�.,as
developed to explore the drain field area. Phase I of' the
explo-ration concentrated on the perimeter holes A, 3, E, and
G.
A Ncdwell mounted Mobile Drill B-50 drill rig was utilized,
using a holloi^ stem., continuous flight a,,iger. The ria- is
owned and operated by Denali Drilling, Inc. Dri,ling v.ras
and test- holes logge'I by I -Ir. O.M. Elat,,-,h, senior
technician./staff geclogist with Alaska Testlah,.
I it
SampliIng was done with an _j split spoon sam,)I.e-_,
to get more s of the gra-nular Soils
As tlie sampJ-1lt?s weroa ;_-ecovered, -they were: sealed 4 n plastic
bags for
Ory r in the labora—u-N!,
aer
cLd contcnt
vv I su a .1 LY c I a s s, f nd the
and dry strel_.,g-h e;..tsy Sa�-,iqles cf
01.
0 in.L CL_ _�, L anJ size- distrilluti`,,Yw
a::b,Jltrary j crcu raln
_p on.
'��(A 0-11 COM 0 - L Urou7-..-;.
was T 7j s
Mr. Dean Thompson and
Mr. Mike Stephens -2- April 5, 1977
Four general soil types were encountered and are listed
below by their group designations for reference to the test
holes. These groups have been correlated with the groups of
our report dated February 15, 1977.
Group A is a brown Silty Gravelly Sand. This group is
highly frost susceptible being rated F-2. Unified
classification is SM. This group is non -plastic.
Gradation is on Sheet 1.
Group B is a brown Sandy Silt. This group is highly frost
susceptible being rated F-4. Unified classification
for the composite group sample is SM. However,
with 490 of the composite sample passing the #200
sieve, this is a borderline group with individual
samples within a group having unified classifica-
tions of SM and ML. Group B is non -plastic and
sometimes contains subrounded or rounded gravel
particles. Group B included eight samples.
Group D is a brown Silty Sandy Gravel. This group is
moderate -1v frost susceptible being rated F-1.
Unified classification is GP. Gradation is on
Sheet 2.
Group F is a brown Gravelly Sand that is non -frost suscep-
tible being rated NFS. its unified classification
is SP and its gradation is on Sheet 3.
The soil gradation shown on the attached grain size distribu-
tion curves are for composite disturbed samples and do not
reflect stratification, which causes the soil to be more or
less sorted in the field. Particles larger than about
2-1/2 inches are not recovered by the sampler. Thus, parti-
cular attention should be called to the test hole logs when
reference is made to cobbles, for they will not be reflected
in the sample.
When drilling was completed, a 3/4" slotted PVC pipe was
inserted in the hole to aid in determining the free water
level. The water level was measured as follows:
Depth to Water Table
While After
Test Hole Drilling Drilling (3-30-77)
A 17.01 16.9'
B Possible Seepage 20:4'
E 13.01 12.5'
G None Observed None Observed
Mr. Dean Thompson and
Mr. Mike Stephens
-3- April. 5, 1977
The soils encountered were generally free,draining, granular
soils that should worn well. as a drain field. our preliminary
findings indicate that the water table drops, and the soils
get cleaner in the area of test hole G. This would indicate
that it would be prudent to keep the drain field as close to
that area as possible.
No soil conditions were found that would preclude development
of the site, though additional exploration should be conducted,
including percolation tests, before final design. A prelimi-
nary design value of 5.0 minutes/inch can be used for the
percolation rate to proceed with conceptual planning.
Idealized soil profiles have been included with this report
showing a schematic representation of the soils in the area.
Soils information is extrapolated between holes and may not
be accurate except at -the actual test.hole locations.
If we can offer any clarification, please do not hesitate to
contact us.
Sincerely,
ALASKA TESTLAB
t
Melvi R. Nichols, P.E.
Laboratory Manager
MRN:rb/sgh
Enclosures
4
_ '77)
T. H. 6
-- - /
�r
Test Hole #A Table P_ WO #9894
Date: 3-25-77
Logged By: D. High
Depth in Feet
From To Soil Description
0.0' - 1.0' Brown Peat, Pt, soft, damp.
1.0' - 7.5' F--4, brown Sandy _Silt, ML, damp, stiff, NP,
Group B.
7.51. - 10.0' F-1, brown Silty Sandy Gravel, GM/GP, damp,
dense, Group D.
10.01.- 15.0' F-4, brown Sandy Silt, PILL, damp, stiff, NP,
Group B.
15.0' - 25.0' F-1, brown Silty Sandy Gravel, GM/GP, damp,
dense, Group D.
25.0' - 30.0' F-2, brown Siler Gravelly Sand, SM, wet, dense,
Group A.
Bottom of Test Hole: 30.0'
Frost Line: 1.0'
Free Water Level: 17.0' while drilling
16.9' on (3-30-77)*
Type of Dry
Sample Depth. Blows/6" M% Sample Strength Group Unified
1 5.0' 18.5 G L B ML
2A 10.0'-10.2' 30.5 SP M B ML
2B. 10.2'-10.6' 15.3 SP L D GM/GP
3 15.0'-15.3' 10.0 SP L D GM/GP
4 19.0'-20.5' 9.0 SP N D GM/GP
5 25.0'-25.5' 12.6 SP L A SM
6 30.0'-30.5' 11.7 SP N -L A SM
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U =- Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural CI.assifircation, see Sheet 2.
6. Unified Classification, see Sheet 3.
* 3" split spoon,used.
Test Hole #B Table A WO #9894
Date: 3--26-77
Logged By: O.M. Hatch
Depth in Feet
From To Soil Description
0.0' - 1.0' Brown Peat, Pt, damp, soft.
1.0' - 5.0' F-4, brown Sandy Silt, ML, damp, stiff, NP,
Group B.
5.0' - 12.0' F-1, brown Silty Sandy Gravel, GM/GP, occasional
cobbles to 6", damp, high density, Group D.
12.0' - 16.5' F-4, brown Silty Sand, SM, with plastic silt
lumps, damp to wet, medium density.
16.5' - 30.2' F-1, brown Silty Sandy Gravel, GM/GP, occasional
cobbles to 12", damp to wet, high density, G.
Bottom of Test Hole: 30.2'
Frost Line: 1.0'
Free Water Level: Possible seepage - u hile drilling
20.4' on (3-30-77)*
Type of
Dry
Sample Depth Blows/6" Mo Sample
Strength
Group
Unified
1
5.0'
24.3 G
L -M
B
r1.L
2
10.0'-11.0'
47/150/- 4.0 SP
N
D
GM/GP
3
15.0'-16.5'
35/53/115 19.2 SP
N
-
SM
4
20.0'-21.5'
10.5 SP
N -L
D
GM/GP
5
25.0'-25.5'
10.4 SP
L
D
GM/GP
6
30.0'-30.2'
8.7 SP
N
D
GM/GP
Remarks: 1.
Type of Sample, G=Grab, SP =
Standard Penetration,
U = Undisturbed.
2.
Dry Strength, N=None, L=Low,
M=Medium,
H=High.
3.
Group refers to similar material, this
study only.
4.
General Information, see Sheet 1.
5.
Frost and Textural Classification, see
Sheet 2.
6.
Unified Classification, see
Sheet 3.
* 3"
split spoon
used
Test Hole A
Depth
in Feet
From
To
0.01
.1.0'
1.01
5.0'
5.0' - 15.0'
Table A WO #9894
Date: 3-24-77
Logged By: O.M. Hatch -D. Hig]
Soil Description
Brown Peat, Pt, damp, soft.
F-4, brown Sandy Silt, ML, damp, soft to
stiff, NP, Group B.
F-1, brown Silty Sandy Gravel, GM/GP, damp
to wet, high density, cobbles to 3", Group D.
Bottom of Test Hole: 15.0' Remarks: Refusal at 15.0'
Frost Line: Trace
Free Water Level: 13.0' while drilling
12.51 on 3-30-77*
Type of Dry
Semple Depth Blows/6" M% Sample Strength Group Unified
1 5.01 19.1 G L B ML
2 10.0'-10,5' 10.9 SP N D GM/GP
3 15.0'-15.5' 12.8 SP L D GM./GP
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information; see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
* Used 3" split spoon .
Test Hole #G Table A WO #9894
Date: 3-24-77
Logged By: O.M. Hatch
Depth in Feet
From To Soil Description
0.0' - 1.0' Brown Peat, Pt, damp, soft.
1.0' - 2.0' F-4, brown Sandy Silt, ML, damp, stiff, NP,
Group B.
2.0' - 18.0' F-1, brown Silty Sandy Gravel, GM/GP, damp,
high density, occasional cobbles, few boulders
up to 36", Group D.
18.0' - 31.0' NFS, brown Gravelly Sand, SP, damp, high
density, particles to 3", Group F.
Bottom of Test Hole: 31.0'
Frost Line: 1.5'
Free Water Level: None Observed
Type of Dry
Sample Depth Blows/6" Mo Sample Strenath Group Unifier:
1 5.0'- 6.5' 6.9 SP N D GM/GP
2 10.0'-10.75' 9.2 SP N D GM/GP
3 15.0'-15.5' SP - D GM/GP
4 20.0'-21.5' 9.0 SP N F SP
5 25.0'-26.0' 8.5 SP N F SP
6 30.0'-31.0' 10.7 SP N F SP
Remarks: 1. Type of Sample, G=Grab, SP = Standard Penetration,
U = Undisturbed.
2. Dry Strength, N=None, L=Low, M=Medium, H=High.
3. Group refers to similar material, this study only.
4. General Information, see Sheet 1.
5. Frost and Textural Classification, see Sheet 2.
6. Unified Classification, see Sheet 3.
.............
....................
............................... ... ........... ......
. . . . . . . . . . . . .
ti
. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....................
........................ .......
.......... ..
sFft(
I- , 't�
................
..........
...........
. . . . . . . . . . . . . P.N j"4 f
1� f4vii MW
. . . . . . . . . . . . . . . . . . . .
.......... .......
"NOX
....... ........
'� l ,
fi
t, glee! I V1, i
irr
i'N
�%�? +per., /� .. � .ir`��'��f: ��...,,,,,,, .*•p
r
r t LIP,
r�r�'rrrlc '�faA
i
'—_+�'
11 Ia..._..l
I,. t i4t�aJrl'I - ir+ tdl PNor ! 3 i
,?le
.... ...................
I f, . r tri 3 shit' s ft? rt , t I'! x�{rz+,.! Ft ,
#I °¢i
l�I�r
i1 �f;t rl if t
art f l,.r.r B'+a i jif16 w'
p}3`
6
nt tagt5 iI" Y,t ftl { H!' iva f U i w c -tf t, s ! .r.-- —
r , pp,,�i .+ , r k I! . c
'2'tsfi it +!1 pt! Pt i 1 + tt`! fei'7 i tr i a+� ! r �(3 i ``iy al ,+ i !s 4! — —
f it f.11 rl 4fj i H 1(teN.ri tt''� fll. r�+� ?ilt. I�t i�4 p't f —
� r I`Ww 4
� 3 t t Pd—
r—
A,
!!!
r� Vf< ! g4t � 11 !
f> t
i utj
r —
p fr
rf ty ��,.ltyii iR IEiL+,i td}Itrt r —
Ir b r i4 + t v yn t i # tt b ! 11}! teIt ltfii�ldt fr 1e! ct iiIt r� tr�1i i tri «t + f Iif r�1 �11= —
— _ — —
—
-- — —
— — -- -- — —
(i,�i — — — —
B ' t t di i! t I it i 4 1' +rii, u n j� ''dt lit �" Lf..• — — — —
i Ni Ik + fl. ��?r c r r t t i'I Ilri tt{ i 7S r t _ — _— — — — — — — _
— — --- --- —
I r{�i Iii i� IY tfitLy tti i r+t"f-.'i!!=!I t 1 : !! — — _ _ _ —
_ _ _
(+�t71+ititti it i"'i — --- ------ --
--'--- ----- ——
SGAt„E� HDRZ; t''$5c�'
V v
w
��D
S I
m SIN
cd
a4 v
\v
r H
J
..T._.
I
-T
Q
��
z ��H
—•jLU
4Z TL
! F
cl
au
0
U)
a o<
t
�°
J a
I
Q
V v
w
��D
S I
m SIN
cd
a4 v
\v
r H
J
..T._.
I
-T
r
! F
w
jLLI�
` N
1 !
f
I
I
CO
O
O
O
v
O
m
o
O(
O
N
a
IW013M Ail H3SHVO3 IN33 aid
0 0 0 0
14 in w 0
100'SEEM '00*
ZOO zoo,
200
KO
Voo,
:i goo,
9o0.
Q Loo 900
900
60 goo,
lg� MUMMI
0
xl�
w *
w
I-- zi
UJ cr
0 ZO'
ira fpCr
go,
90' 90'
J.0.
Ooz
80'
I.
001
02
09
OC
3� 01,
Iw 0
CL oz
ti 91
Olin M
of
<
z
4�I vi
> H
2/7
LU -2
_ 4,£
z Min
X
z
10 Z/IZ
w
fu
9 IN z
0 0 0 0 0 -7) 0 0 0 2 0
C' 0 IHh013M A'00 H3NI'4' IN30" k13d -
�I�i��l,�l..'
��'
,
M
I�x��'<��rr�O
�
��
LU
Lq
<0 <
'0
0
V)
<
<
>
IW013M Ail H3SHVO3 IN33 aid
0 0 0 0
14 in w 0
100'SEEM '00*
ZOO zoo,
200
KO
Voo,
:i goo,
9o0.
Q Loo 900
900
60 goo,
lg� MUMMI
0
xl�
w *
w
I-- zi
UJ cr
0 ZO'
ira fpCr
go,
90' 90'
J.0.
Ooz
80'
I.
001
02
09
OC
3� 01,
Iw 0
CL oz
ti 91
Olin M
of
<
z
4�I vi
> H
2/7
LU -2
_ 4,£
z Min
X
z
10 Z/IZ
w
fu
9 IN z
0 0 0 0 0 -7) 0 0 0 2 0
C' 0 IHh013M A'00 H3NI'4' IN30" k13d -
�I�i��l,�l..'
��'
,
I�x��'<��rr�O
�
��
zn
Lq
'0
0
IW013M Ail H3SHVO3 IN33 aid
0 0 0 0
14 in w 0
100'SEEM '00*
ZOO zoo,
200
KO
Voo,
:i goo,
9o0.
Q Loo 900
900
60 goo,
lg� MUMMI
0
xl�
w *
w
I-- zi
UJ cr
0 ZO'
ira fpCr
go,
90' 90'
J.0.
Ooz
80'
I.
001
02
09
OC
3� 01,
Iw 0
CL oz
ti 91
Olin M
of
<
z
4�I vi
> H
2/7
LU -2
_ 4,£
z Min
X
z
10 Z/IZ
w
fu
9 IN z
0 0 0 0 0 -7) 0 0 0 2 0
C' 0 IHh013M A'00 H3NI'4' IN30" k13d -
�I�i��l,�l..'
��'
,
I�x��'<��rr�O
�
��
zn
>
C,
0
O
0
C.,11
1
IW013M Ail H3SHVO3 IN33 aid
0 0 0 0
14 in w 0
100'SEEM '00*
ZOO zoo,
200
KO
Voo,
:i goo,
9o0.
Q Loo 900
900
60 goo,
lg� MUMMI
0
xl�
w *
w
I-- zi
UJ cr
0 ZO'
ira fpCr
go,
90' 90'
J.0.
Ooz
80'
I.
001
02
09
OC
3� 01,
Iw 0
CL oz
ti 91
Olin M
of
<
z
4�I vi
> H
2/7
LU -2
_ 4,£
z Min
X
z
10 Z/IZ
w
fu
9 IN z
0 0 0 0 0 -7) 0 0 0 2 0
C' 0 IHh013M A'00 H3NI'4' IN30" k13d -
e
U)
r
>1
j
I
IK
en
�,
SNI
-C�
Q
'
o
E
�_�
E-
N'
-4t
coO
C
N
u
0
LU
z. 0 cz
P,4 co m
<
2
Ui
z
e
U)
r
j
I
IK
0
EW
SNI
Cj
~
41
'
N
E
N'
-4t
coO
e
U)
r
IK
uj W
SNI
Cj
~
'
N
00
N'
-4t
coO
C
N
1H013M AS U3GNV03 IN33 83d
0 p 00 0 0 0 0 0 0
10a CD
100*
zoo' mo'
£00- e00*
U)
t,00*00,
>- :i Too* i llu� in 900'
J
< 9w ILININNION NUNN u Sao.
z - Loo' onions on
900' Ooa
60
SEEM 10*
cr
W z
F- ;x
Witt
MCIZO 20'
so* N N
4k, a
90' 90'
go:— 90'
40
00Z so*
001
z OT
Z'
09
cc £ i
0i,
02
(L
07
w 9
x
01
mmu
>-
_j p -j
<
z
<
9
tv, -9
W
S/T
>
w
DE
z
z'Iot,
C19
LL 9
o
ul DO
Dol
19
07
o o o o 0 0 o
`o -z N -
1.1401:1M Aa H 3141-4 IN33 Mad
c)
Stephens Construction
2.700 East Tudor Toad
Anchorage, AK 99503
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
September 12, 1977
W.O. #110424
Grid #2439
Attention: Mr. Bill Talmadge
Subject: Subsurface Investigation Silver Crest Subdivision
Lots 1-6, Block 2; Lots 5-9, Block 1
Gentlemen:
We are transmitting the following information :with regard to
the subject property.
Vicinity Map Figure 1
Test dole Location Sketch Figure 2
Soils Data 11ap Figure 3
Test. Hole Logs Table A
Explanatory Tnformation Sheets 1-3
Previous Subsurface Investigations Appendix A -C
The following is a brief summary of our exploration activity
in the project area.
1. A series of 14 "test holes were drilled on the west side
of Homestead 'T'rail in 1975. For additional information,
refer to Appendix A.
2. Eight test holes were drilled in F ebruary 1977 in
Tract. B --1A of Nettleton ?acres Subdivision. These
inc-Luded eater table observations and two percolation
tests. Three of the hole: and one percolation test
were within the area discussed in this report, and the
others were ad' j a ;E.'!nt to i -t. The report ir_cludf s
idealized soil, profiles, and is included as Appendix B.
3. I?our additional test. holes wera drilled .in March 1977,
all within this study arca. This study included deep
explorat'Lon with. three 30` holes, and water: table
observations. Soil profiles are also given. Sec
Apper,12_ix C".
4. Afi:C2" W l l `:x_0!1 Of ?i i -:,'-J nc_s i nforini lthin, tho soils' � on
"the Study ar. -'a appe�,aro t,c) be quite- uniform and vora1>le
Stephens Construe ion
September 12, 1977
Page 2
to individual wastewater systems. In order to fill in
some minor gaps in the data, three additional test
holes were bored and two additional percolation tests
were performed. Exploration was conducted on August 8-9,
1977 using a Nodwell mounted Mobile B-50 drill rig with
solid flight auger. The rig is owned and operated by
Denali Drilling, Inc. Hole logging and supervision was
done by Mr. Terry L. Barber, geologist with Alaska
Testlab. These results verified the soil type trends
already observed.
Percolation tests, using the Municipality of Anchorage,
Department of Public Health and Environmental Protection
method were performed on test hole "Y" of this study and on
hole #7 of the February 1977 study. For the test, when
drilling was completed, a 3/4" slotted PVC pipe was inserted
in the hole to aid in determining the free water level. For
the percolation test, the test hole was filled with water
and left overnight to saturate. On returning the next day,
the hole was refilled with water and the drop in the water
level carefully monitored over the next 60 minutes.
The observed minimum percolation rates were:
Test Hole "Y" 2.5 minutes/inch
Test Hole #7 4.0 minutes/inch
These and data from other test holes is compiled in Figure
3.
Figure 3 shows the proposed design absorption system value
for each lot in the study area. These are based on percola-
tion data, visual examinations and continuity of soil between
holes.
We trust the foregoing is sufficient to your present needs.
If there are any questions, please do not hesitate to contact
US.
Very sincerely,
ALASKA TESTLB
__A
R. M rk Hansen
RMH:rb
Enclosures
APPROVED
Me1Vin R. Nichols, P.E.
Laboratory Manager
0
r
X S G ��
4
"v H � O `7, n�G �•, j N >y N. _ •y2 cJ Y• M
+ c.'
N I
m 3 F- *�CC•.�r �� \ -U rn v \ •� r� .rv' � -' V r_ S,
vi
/NyVU Cco S :' i
} l � � w' � \ ._ m °c �.���-gid wx 4,•.s' :.
�v/ w
,Im � t1 A 9 � +,���` .G� x:48}? S t„\' 6' aF' l•,p •.•`�;� �^'tJ �>
��I� a � � � •s ; 1 e z
' .. S � J`�lyrrte y � � `'� •y2 •.= rr�F M Q� lD
3 E � •�.C�711�� ^ r0U;2' 61. ? ! � \ v N _r 117
6s Z i S� 01
. � o � 66 ,hb�• M
2 g yn °��F�n \ d Z l''Jv J 97
or)\ a
3.69 61c0 , v' . S'L
c' 0 ;. � _'•Y. J � j�i - R:
CD
LO
1 u `
.N W N d V ;� [ - N , . E— r6, ' � .' / � n rC > •._ a• .•,>.vyr « tom+
{ `-' L � wl— v. c'i /y,, �� ,� \\ Gil si y•Y�2 �j
T. 0) M
i
Q._j
W
�' `-� `' til i,tG C: { �mti C i C {�". yr r .. M vi• �
••' N u� C� i..ty c�. � ter'' � � � µ�_"�-vs[s s Q
•`Z
LO
AV
Lb
UJ g { o aX Nrr 2
I ! 9 F to c,
i
2
A
= y z ` �Q•' �� p
0
to
p
� � g .�, .� n• �{ n 2 •.<'� SSP <
t5 ( 2 w( — c r vi 8 r' Oi t0
coo•
m' to S r- —'— ti •�`..
M
S o m s s? N N oro
Jin-
In S _
W UJ Y t•I o CA
,
co
to J rnr. 4• w i V � to g � � � C� S X 9 r 'T �
a? vi
IT
oc
f I IU-lnJ \
, 0.�s�' S ��. )£AZ : ,•Nrv(1 � i `,.�.__ Q EST _ ..
j� — `4. ��� V <\.? h'•I : j _s ry • , . nn'�{`,6 Ci _' � M - .. � { I n , ,1
Lot 1, Block 1
Silver Crest Sub.
Test Hole No.Z
Depth in Feet
From To
0.0' 0.5'
0.5 10.0
TABLE A
Date: 8/8/77
Logged By: T.L. Barber
W.O.# 10424
SOIL DESCRIPTION
Brown Peat
F-2, brown Silty Gravelly Sand, SM, many cobbles,
wet to saturated, medium density.
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth Mo
1 5.0' 18.0
10.0 ft.
None observed
7.0 ft. while drilling
Type of Dry
Sample Strength Group
G L A
Unified
Classifi'catioi
SM
Remarks: 1) Type of Sample, G=Grab, SP=Standard Penetration.
2) Dry Strength: N=None, L=Low, M=Medium, H=High.
3) Group refers to similar material this study only.
4) General Information, see Sheet 1.
5) Frost & Textural Classification, see Sheet 2
6) Unified Classification, see Sheet Z.
NOTE: DRILLING REFUSAL AT 10.0 FEET.
Lot 4, Block 1
Silver Crest Sub.
Test Hole
No.Y
Depth in
Feet
From
To
0.0'
2.0'
2.0
2.5
2.5
10.0
10.0 11.0
11.0 15.0
15.0 20.0
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth
1 2.5'
2 5.0
3 10.0
4 15.0
5 20.0
Date: 8/8/77
Logged By: T.L. Barber
TABLE A
W.O.# 10424
SOIL DESCRIPTION
Brown Peat, Pt, wet, soft.
F-2, brown Silty Sand, SM, wet.
NFS-F2, brown slightly Silty Slightly Gravelly
Sand, SP -SM, wet, medium density, subrounded
and rounded particles to 3/4".
F-2, brown Silty Sand, SM, with random gravel,
wet, medium density.
F-2, brown Silty Gravelly Sand, SM, with layers of
Gravel and Sand, wet, medium density.
F-4, brown Sandy Silt,'SM, wet to saturated,
stiff.
20.0 ft.
None observed
17.0-18.0 ft. while drilling
Type of Dry Unified
Mo Sample Strength Classification
G SM
G SP -SM
G SM
G SM
G SM
Remarks: 1) Type of Sample, G=Grab, SP=Standard Penetration.
2) Dry Strength: N=None, L=Low, M=Medium, H=High.
3) Group refers to similar material this study only.
4) General Information, see Sheet 1.
5) Frost & Textural Classification, see Sheet 2
6) Unified Classification, see Sheet
Lot 22, Block 2
Silver Crest Sub.
Test Hole No. ZZ
Depth in Feet
From To
0.0' 0.5'
0.5 2.5
2.5 5.0
Bottom of Test Hole:
Frost Line:
Free Water Level:
SA.
NO. Depth
1 5.01
Date: 8/8/77
Logged By: T.L. Barber
TABLE A
W.O.# 10424
SOIL DESCRIPTION
Brown Peat
F-2, brown very Silty Gravelly Sand, SM, damp,
many cobbles, sharp and subrounded particles.
F-4, brown Sandy Gravelly Silt, SM, damp,
many cobbles.
5.0 ft.
None observed
None observed while drilling
Type of Dry Unified
M% Sample Strength Group Classificatic
7.2 G N SM
Remarks: 1) Type of Sample, G=Grab, SP=Standard Penetration.
2) Dry Strength: N=None, L=Low, M=Medium, H=High.
3) Group refers to similar material this study only.
4) General Information, see Sheet 1.
5) Frost & Textural Classification, see Sheet 2
6) Unified Classification, see Sheet 3.
NOTE: Drilling refusal at 5.01.
5' N offset met refusal at 3.51.
10' N offset met refusal at 5.0'.
y
4040 "B" STREET
ANCHORAGE, ALASKA 99503
14LA= A TEST�Q (907) 278-1551
April 28, 1978
W.O. #D10914
Grid #2439
Mr. Mike Stephens
Stephens Construction
P.O. Box 3-3772 ECB
Anchorage, AK 99501
Subject: Subsurface Investigation for Feasibility for
On -Site Sdwage Disposal Systems
Lots 11, 12 and 16, Block 2, Silvercrest Subdivision
and Lot 1, Block 1, SST Subdivision
Dear Mr. Stephens:
As requested we performed a subsurface investigation on the
four above referenced lots to determine their suitability
for placement for on-site sewage disposal systems. Three
test holes were placed on April 12 and 13, 1978. The holes
were drilled by Denali Drilling, Inc. The test holes were
logged and the drilling supervised by Mr. O.M. Hatch, senior
technician/geologist with Alaska Testlab.
The holes are located on the adjacent figures #1 and #2.
The test hole logs are included as Table A. it may prove
helpful in interpreting the data on the test holes logs to
review the standard explanatory information contained.on
Sheets 1-3.
Once the test holes were drilled, they were cased with
slotted plastic pipe. About a week later the test holes
were checked for ground water intrusion into the holes.
None had occurred. All three of the test holes were dry.
Then on April 25, 1978, the test holes were filled with
water and left over night to saturated. A percolation test
was then performed the next day, April 26, 1978, by refilling
the holes and monitoring the rate at which the water fell J_n
the holes at 10 minute intervals for a period of one hour.
The percolation rates based. on this testing are as follows:
Lots 11 and 12., Block 2, Silvercrest -- 10 minutes/inch.
Lot 16, Block 2, Silvercrest Subdivision -- 5.7 minutes/inch.
Lot 1, Block 1, SST Subdivision -- 2 minutes/inch.
Mr. Mike Stephens
April 28, 1978
Page 2
We would caution the use of a percolation rate as fast as 2
minutes/inch in Lot 1, Block 1, SST Subdivision. It is our
experience that due to the clogging action of sewage effluent,
that a more conservative design value be used in silty sands
and silts. They that have a tendency to clog. We would
recommend a design value of 5 minutes/inch.
We hope this is sufficient for your present needs. If we
can be of further service or offer any clarification of any
data presented here, please do not hesitate to contact us.
Very sincerely,
ALASKA TESTLAB
�� Ir , N ! s
Melvin R. Nichols, P.E.
Laboratory Manager
'3
52,120 f.
B L O�
12 CP
49,4 3 6 S.f 14
8 47,045 s.f0
pyo I I <1 1 -1
E
10- cp 59.4 81
C)
.2 619 s.f.
Go
15
S \20
UU
--e 53 62 2 s. f.
61 or 901
w
A
3--
16
52, 377 s.f.
Q :2 L- 29 50
Y
17 CA C;,
43,002 s.f.
V,
3
43 756s.f. <.,
51510S.f.
18
0
z N
46, 461 s.f.
30 33 12 53j U
T
c" R
Is
2 EAST 11S '
------- co
- A.
PS C!R
49, 449 s.f A
52.5v 178-12
A". J
22 O)j
50,06 1 s. f.
Y�"q "' 1 " 43, 482 s.f.
r
10' Teleptove b 1:;cctrfc corer -1 —03
W)` 5 18 W 13x'.0-'( N! E;T� !1,, LC'
D I M 0 1\1 D
-L�2 2G 39.37 REC.84 M, L 16.
Lot 1 Table A WO #D10914
Block 1, SST Subd. Logged By: O.M. Hatch
Date: April 13, 1978
Depth in Feet
From To Soil Description
0.0' - 1.0' Brown Peat, Pt, damp, soft.
1.0' - 2.0' F-4, brown Sandy Silt, ML, damp, stiff, NP.
2.0' - 16.0' F-2, brown Silty Gravelly Sand, SM, damp,
particles to 3".
Bottom of Test Hole:
Frost Line:
16.0'
11MIN
Free Water Level: None Observed
Lots 11 & 12 Table A WO #D10914
Block 2 Logged By: O.M. Hatch
Date: April 12. 1978
Depth in Feet
From To
0.0' - 0.5'
0.5' - 7.0'
7.0' - 11.0'
11.0' - 16.0'
Bottom of Test Hole:
Frost Line:
Soil Description
Brown Peat, Pt, damp, soft.
F-4, brown Gravelly Sandy Silt, M -L, stiff,
NP, particles to 2".
F-4, brown Sandy Silt, ML, damp, stiff, NP.
F-1, brown Silty -Sandy Gravel, GM, damp,
particles to 3".
16:0'
0.5'
Free Water Level: None Observed
Lot 16, Block 2 Table A WO #D10914
Logged By: O.M. Hatch
Date: April 12, 1978
Depth in Feet
From
To
Soil Description
0.0'
- 1..5'
Brown Peat,
Pt, damp, soft.
1.5'
- 6.0'
F-4, brown
Sandy Silt, ML, damp, stiff, NP.
6.0'
- 16.0'
F-4, brown
Gravelly Sandy Silt, ML, damp;
stiff, NP.
Bottom of Test Hole: 16.0'
Frost Line: 0.5'
Free Water Level: None Observed