HomeMy WebLinkAboutSST Lot 3-6 S-43891
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4040 STREET,
AL1.AB
ANCHORAGE, ALASKA 99503+
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PHONE 91)7:79-581
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June z30, 1977
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Mr Mike Stephens,
3810,' E<astWno-d -Loop.
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{Dear"Mr. Stephens:
i This is a,4 addendum to our
report to, you dated Maxc� h_7 y�7,
oFi the "Don Nettleton 10 Acres".
F
,.
-ht osed you will find'an
idealized soil profile through the
�a5 of, -.hots 3 through, 6
(test holes 1 and 2). :'Conditiofis
}
=�s,m to be good for on•ssite,disposal
systems in this are:Fa,
R"v
.{
,i surfacesoil
appear to be rather Parm. W
T
.conditions
�4Tjtinely suggest, though,
that each absorbtion trench,, as it
''r1
t� excavated, be examined
If significantariltce
iapvars, from the soil profile,
,clos"ely.
we should be cons,ed.bfore '
construction prooeeds.
y 7
Very sincerely ,
f
ALASKA
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DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
PLATTING OR PLANNING AND ZONING CASE REVIEW
CASE NUM3ER C_4329
N
Preliminary
PETITION FOR" REZONING OF 10 acre cubd prey unsuhdividpd land rnntaininn 1n,01 acre
SPECIAL EXCEPTION
VACATION
RESUBDIVISION
DATE RECEIVED
COMMENT TO PLANING BY April 21, 1977FOR MEETING OF Mary 5, 1977
COMMENTS:
ENVIRONMENTAL SANITATI
rG
MAC,
ENVIRONMENTAL ENGINEERING:
u
71-014 (9/76)
TER- VAI LAE
VER NOT
T�.AAVAILAB
A-�L/
,Sr /AA
Cases
VICE PETITION ARE
0 J
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o/vr
ALA LAB
Mr . ?:lean : ho mason. and
r.; cF S -evens
742 W. 791-.1,. Avenue.
A'?lcnoracxe, -'t.. 99501
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
Ymarcn 7, 1977
'o. 49'06
(,rid 7#24.39
Subject.: Subsurface Investigation on "Don Nettleton" 10
Acres
Gentlemen:
Transmitted herein, at the request of Maurice Oswald of DO',4'.L
yr:gircers, are the results' of the su> ject investi r .tion {or
the project: located in. the N.E. c'orne l-- of Sec. 14 , T . 1 2 I: ,
R. 3 W, S.M,. Alaska. The data is organized as follows:
Figure
Test Hole Location Sketch Pigure 2
'gest Hole Logs Table A
F;xrlanatory Information Sheets 1_3
Grain Size Distribution Ci?r fes Sheets q-8
Th, exploratio ,. was conducted February 28, 1977 and consist -Ed
of four test holes. Samples c-nsisted of twel-1 "
"gra
Saiii_p_Les taken fro:". the au,,�er fIi,.-h'i-S. The Sai plJLi1L; 122tC::rt;al
:vas five feet. ` the <3 PPr(,)xi nat`- test hole locations are,
Shown on .c lUUre 2. l"he exploration was conducted using =i
'1^oawell i'`our.te(' moIlle D:iill. I -50 -Rig ;-quipped with a coi'_t.111:.10 s
i .; N ,V...�_,__ TI c* -.; w and operat-:d 1D
_ : l,crttt so___ stei�I a .,..L . l.r,.t: ri, _s :�c.-led
De.I
., .. - , Inc. 'Drilling was supervised and t,1,_ -fit_?�
Hatch -i, geo-io,-ist/-senior t30h"_;?::1c:i
wi _hAlas}-.,. Testlab. T-ble A i:s a io_a of the test ho3_.as
ret:.J.ec -'Ina dell-I)se:iat loris and -vis aal CldS5lf ices Ci.40—
Well
we .l as Ci c!J.l-t: l_ v c, . -Id 1'^a. ti�%
tatie laboratory analysis .
m
As wore rec0iic_'r,, 'i!ev were
vlSllal.ly CZaSS1.Y]_ .C1 aC
L -„ - '-r-'^^ , tl_O?? do the _-3bJraL`O.r'.r
sealed _i n. t,;_aStic bags for i.. �i..::"_ oX" 1
.'._n the labJ-3,t-or _.dl Of qi pl.Lil r :;J LJr, x. C. . ,�.. t_ d
n`'l ed togc`t1'iEr F.'?ld g1i'c'n
an .1t J._tY n 6-3,_Cf ri.a 2ril ] c:L e a,ia1'
jP _
'li (:. r':E-1)r',.ir2(i t..) r�Llr �: )- c�7... Su!'•. is �.�J - GC'i1 'iYC)!IDL;.
I (': ! .�Y nr? \1� '_':o E".>�r.. r}un '(;•r,^_-�: Cti?. t.t.1. '. "�,..F'i2 :;•a?1. (i .d
_.. - - '
} } + th. ,. .;7 ; ) si.r,.-1. C:I,.. 1:'oY ..i, t?: er.ct, 1-0t_ c e ,
Mr. Dean The 'son and
Mike Stevens
March 7, 1977
Page 2
Group A is a brown silty slightly gravelly sand. This
group is moderately frost susceptible, rated F-2.
Unified classification is SM. Group A was typically
poorly graded, contained all sand si-es, was damp
and of medium density.
Group B is a brown silty sand. This group is moderatly
frost susceptible, rated F-2. Unified classifica-
tion is SM. Group B contains fine sand and much
more silt than Group A even though both groups
have SM unified classifications. Group B should
be expected to have lower permeability.
Group C is a brown very sandy silt. This group is highly
frost susceptible, rated F-4. Unified classifi-
cation is SM. Group C contains fine sand and is
typically damp and stiff.
Group D is a brown gravelly sand with trace of silt. This
group is non -frost susceptible to slightly frost
susceptible, rated NFS/F-2. Unified classifi-
cation is SP. Group D is typically damp, of
medium density and contains subrounded particles
to two inches. Group D is expected to be highly
permeable.
Group E is a brown silty sandy gravel. This group is
moderately frost susceptible, rated F-1. Unified
classification is GM. Group E contains occasional
cobbles, is typically damp, of medium density and
contains subrounded particles to 12 inches.
Group E is expected to be less permeable than
Group D.
Group F is a brown gravelly sandy silt. This group is
highly frost susceptible, rated F=4. Unified
classification is SM. Group F is typically damp,
non -plastic and contains subrounded particles to
two inches.
The soil Gradations shown on the attached grain size distribu-
tion curves are for composite distrubed 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. These larger
particles such as course gravel, cobbles, and boulders mist
be detected by drilling action. The attached grain size
distribution curves are not entirely representative as the
larger sized particles are missing.
When drilling was coripleted a 1 1/2" slotted plastic pipe
was inserted in each hole to aid in determining the water
Mr. Dean Thoirrlpe�� and
Mike Stevens
March 7, 1977
Page 3
level. For the percolation test, test
filled with water and left overnight to
the next day the hole was refilled with
in the water level carefully monitored
minutes.
holes #1 and #4 were
saturate. On returning
water and the drop
over the next sixty
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 manner to evaluate a site
for a proposed on-site sewerage system.
Using the above test, the observed minimum percolation rate
was 2.7 minutes per inch for hole #1 and 13.9 minutes per
inch for hole 44. Percolation tests were not pdrformed on
holes #2 and #3.
A water level measurement was made in each hole approxi-
mately 24 hours after drilling was completed. These free
water levels, as shown on the test hole logs, should be used
with caution. The free water level normally fluctuates
seasonally and with percipitation.
Since NFS material is required for road bases, there appears
to be very little on-site soil suitable as borrow material
for road construction.
We trust the foregoing is sufficient to 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
R. Mark Hansen
RMH:MRN:ale:rb
Enclosures
APPROVED
Le
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Me1v.-Ln R. N_Lchols; P.E.
Laboratory Supervisor
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1
MEXRILL fIEfO ... !t t
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!. .• CAMPBELL AIRSTRIP
THIS PROJECT
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�a.a..�}.�...� .o.:�..• � '� ( •.u. u.cw.r.�.q._++� vrA I`i•. a� •: I �.�T - ,. u. _ +.e
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FIG. L
r�i ;
Tr9.T i4c),in. vf)f,A,�,jn\, f 1G. 2
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Test Hole #1
Ate:
Logged By
Table A WO #9966
2/28/77
O.M. Hatch
Depth in Feet.
From
To
Soil Description
0.0
0.5
Brown Peat, Pt, damp, soft.
0.5
2.0
F4, Brown Sandy Silt, ML, damp, mendium
density.
2.0
7.0
F2, Brown Gravelly Silty Sand, SM, poorly
graded, all sand sizes, damp, medium density,
.rounded particles to 2", Group A.
7.0
11.0
F2, Brown Silty Sand, SM, poorly graded, fine
sand, damp, medium density, Group B.
11.0
16.0
F4, Brown very Sandy Silt, SM, fine sand,
damp, stiff, Group C.
Bottom
of Test
Hole: 16.0 ft.
Frost
Line:
Trace
Free Water
Level: None observed while drilling.
None observed after 24 hours.
Type of Dry
Sample
Depth Blows/6" M% Sample Strength Group
Unified
1
5'
G A
SM
2
10'
G B
SM
3
16'
G 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.
,. iii `� ' �1 !�
ate: 2/28/77
logged By: O.M. Hatch
Test Hole #2 Table A WO #9966
Depth in Feet
From
To
Soil Description
0.0
1.0
Brown Peat, Pt, damp, soft.
1.0
3.0
F4, Brown Sandy Silt, ML, damp, soft, NP.
3.0
7.0
NFS/F2, Brown Gravelly Sand, SP, with trace
silt, damp, medium density, subrour_ded
particles to 2", Group D.
7.0
11.0
F2, Brown very Silty Gravelly Sand, SM,
medium density, subrounded particles to 3",
Group A.
11.0
15.0
F1, Brown Silty Sandy Gravel, GM, occasional
cobbles, damp, medium density, subrounded
particles to 12", Group E.
Bottom
of Test
Hole: 15.0 ft.
Frost Line:
Trace
Free Water Level:
None observed while drilling.
None observed after 24 hours.
Type of Dry
Sample
Depth
Blows/6" M% Sample Strength Group Unified
1
5'
G D SP
2
10`
G A SM
3
15,
G E GM
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.
;'r
1J '�( .I,
Fite: 2/28/77
i,ogged By: O.M. Hatch
Test Hole #3 Table A WO #9966
q/
Depth in Feet U J
From To Soil Description
0.0 1.0 Brown Peat, Pt, damp, soft.
1.0 2.0 F4, Brown Sandy Silt, ML, damp, soft to
stiff, NP.
2.0 6.0 F2, Brown Silty Gravelly Sand, SM, poorly
graded, all. sand sizes, damp to saturated,
medium density, saturated seam about 6',
Group A.
6.0 12.0 F4, Brown Gravelly Sandy Silt, ML, damp,
stiff, MP, subrounded particles to 2",
Group F.
12.0 16.0 F4, Gravelly Sandy Silt, SM, damp, subrounded
particles to 2", Group F.
Bottom of Test Hole: 16.0 ft.
Frost Lire: Trace
Free Water Level: 6.0 while drilling.
5.0 after 24 hours.
Sample
1
2
3
Remarks:
Type of Dry
Depth Blows/6" M% Sample Strength Group
5' G A
10' G F
16' G F
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.
Unif ied
SM
ML
SM
Test Hole #4
Depth in Feet
From
To
0.0
1.0
1.0
3.0
3.0
15.0
Bottom of Test Hole:
Frost Line•
Free Water Level:
Sample
1
2
3
Remarks:
Depth
Table A
Date: 2/23/77
Logged Bv: O.M. Hatch
WO #9966
Soil Description
Brown Peat, Pt, damp, soft.
F4, Brown Sandy Silt, ML, damp, stiff, NP.
F4, Brown slightly Gravelly Sandy Silt,
ML, damp, stiff, NP, subrounded particles
to 1", Group C.
15.0 ft.
Trace
Trace at 12' while drilling.
None observed after 24 hours.
Type of Dry
Blows/6" M% Sample Strength Group
51 G C
10' G C
15' G C
1. Type of Sample, G=Grab, SP = Standard Penetration_,
U = Undisturbed.
2. Dry Strength, N=None, L=Loi,%, 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.
Unified
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ML
ML
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