HomeMy WebLinkAboutTHOMAS L BOYLE Tracts 1A & A2 S-7313Thomas L 0
Boyle
5-7313
Tracts I A&A2
0
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION 1
Environmental Health Division 4y.
CASE REVIEW WORKSHEET yf
CASE NUMBER:
S-7313
DATE RECEIVED:
October 50 1983
COMMENTS DUE BY:
October 21, 1983
SUBDIVISION OR PROJECT TITLE:
Tracts A-1, A-2 Boyles Subdivision
( ) PUBLIC WATER AVAILABLE ( ) PUBLIC SEWER AVAILABLE
( ) COMMUNITY WATER AVAILABLE
CO ENTS:
%✓//JJ//
L & 5
-L
42)
Fact, eG -�
► s
o
•c. U -C A
FAH-<- A7
Alaska Testlab
1040-g-Slreel - Anchorage, Ala.4a 99501
Quadrant Development Company
621 West Dimond Blvd.
Anchorage, Alaska 99502
Attn: Mr. Joe Vicente
0
phone (907) 279-1551 ( Telecopier (907) 272-5742 )
May 6, 1981
W.O. #A19747
Grid #2734
th of
man
Subject: SubsRoaduandcEastpofrLakenOtis;ANWe1/4act andNNr1/2 ofHSWf1/4,
SW 1/40 Sec 211 T12N, R3W
Dear Mr. Vicente:
Transmitted herein are the boring logs for the 9 test holes
drilled on the subject property. Also included is a location
sketch for the test holes and results of laboratory tests on
selected samples.
Prior to drilling, a site reconnaissance was performed by Mr. O.
M. hatch, geologist with Alaska Testlab. In this reconnaissance,
Mr. Hatch examined geologic features, topography, vegetation, and
other information, to determine the most likely locations of
possible permafrost, deep peat, or other subsurface anomaly.
Test hole locations were selected at this time to determine
general subsurface conditions; additional test hole locations
were based on conditions encountered during the initial drilling.
Subsurface exploration at this site was conducted April 22, and
April 23, 1981. Test holes were located as shown in Figure 2.
The test holes were drilled using a Nodwell mounted, Mobile B-50
drill, fitted with a hollow stem auger. The drill rig is owned
and operated by Denali Drilling, Inc. In Borings 1, 2, 4, and 5,
the standard penetration test was, performed and split spoon
samples were obtained at 5 foot intervals. The SPT is a measure
of the relative density and consistency of a soil. The other
borings were drilled with a solid flight auger. These probes
were placed to determine the depth and extent of the deeper peat
deposits. Grab samples were obtained from the underlying sandy
silt layer.
The drilling was supervised and test holes were logged by Mr.
O. M. Batch. The samples were visually identified in the field,
were sealed in plastic bags to preserve the natural moisture
content, and were returned to the laboratory. Additional lab-
oratory testing included tests to determine grain size distri-
S7313 OCT 241983
Quadrant
May 6, 1981
Page Two
bution, frost classification, and index properties of fine-
grained soils.
The majority of this site is overlain by a 2 to 3 feet layer of.
peat. "'Below"this peat layer- is"Silt, 8a'hdy'Silt,•`and Gravelly
Sandy Silt, with occasional Silty Sand lenses. Thi'oundlis
water
relatively dense and of low compressibility. The g -
table is quite shallow, gendrally�..t_a-depth-of.-2-fe-gLt b low
grounci -sukTacU-.--TH-e--w`aEer level measured.while drilling is
likely higher than it will be during most of the year. The
_ground water level will fluctuate with seasonal and weather
changes. 1
rand
TL area near the northwest corner of this site was found to be
verlain with a relatively deep, highly compressible peat layer.
his peat layer is about 8 to 10 feet thick, and covers about 8
cres. Below the peat layer is a Sandy Silt of medium stiffness
low compressibility. The water table is also about 2 feet j
below the ground surface in this area.
The silts underlying the surface peat at this site are sufficient-
ly stiff such that excessive settlements should not be of concern
for the average commercial or residential development. Excavation
of the peat would be required for structures using spread footings,
from beneath footings and on -grade slabs.
in parking areas the neat would need to be removed and replaced
with 2 to 3 feet of NFS fill. Where the peat layer is less than
S feet thick, the peat could be overlain with about 4 feet of
fill, with the expectation that considerable settlement will
occur, but will decrease with time such that the fill could be
bladed and paved after one year.
The high water table and the relative poor draining subsurface
soils will be of concern for development at this site. Structures
should not be placed below grade unless considerable precautions .
are taken. Subsurface drainage or raising the building site
would be necessary to keep.ground water away from buildings.
Foundations with a crawl space could be used to raise the floor
above the water level, and would decrease the amount of fill
required. Excavations for footings and utilities will probably
require dewatering.
Development in the deep peat area will be expensive. Structures
could be founded on piles placed through the peat layer, but
surrounding fill placed for building access could be expected to
settle for many years. A convention earthwork approach could
also be used -excavating the peat and replacing it with compacted
fill.
(X --TI ALASKA TESTLAR
Quadrant
May 6, 1981.
Page Three
if you have any questions regarding this report, please feel free
to call.
CAB/smb
Attachments
very truly yours,
ALASKA TESTLAB
Carl A. Bassler
Geotechnical Engineer
Approved:
LQZN)102w� .-
Melvin R. Nichols, P.E.
Manager
A T ALASKA TESTLAB
` APPFOxiMATE
1�DEEP pl:A-T
LZMZT
-
iao
_270"t —/T M. 7 700' �
��!✓
K
Sol:
` .
T s4 3
T44�4-H. G
f
90o i
•
�oo'i 7. H.$
'
944 =
THA
2gd►
'(. H. I
3sc;
I
11
I
f�
•u!
Y
Q
v
f`Y .\t!%�('� IL:•T rll+L�
G��.'AiLf` �
IOCATION•-
A T L ALASKA TESTLAB
Table A WO pA19747 .�
Test Bole 11 Date: 4/23/81
N:
Logged by: OW1
Depth i�et
From To
0.0 2.5
2.5 20.5
20.5 21.5
Soil Descri tion
Brown Peat, (Pt)
F-4, Brown to Grey Silt, (:4L), NP to PL-,
moist, stiff, with occasional sand lensing
and gravel
F-4, Grey Gravelly Sandy Silt, ML), NP,
moist, hard
Bottom of Test Hole:
Frost Line:
Free Pater Level:
Sa.
11o.
Depth
1
5'-6.5'
2
10-11.5'
3
15-16.5'
4 20-21.5'
Type of
Blows/6" DS$ Sample
7/23/28 29.7 STD.PEN.
30/27/28 23.3 STD .PEN.
7/18/25 46.2 STD .PEN.
17/28/33 20.7 STD .PEN -
Group classification refers to grouping by visual identification,
this exploration only -
Refer to explanatory information attached to aid interpretation
of soil description.
AT L) ALASKA TESTLA6
Temp.
Dry
Srenath
Group
Unified
F�
L
A
ML
38
VL
A
ML
42
L..
A
ML
40
L/M
B
ML
42
Group classification refers to grouping by visual identification,
this exploration only -
Refer to explanatory information attached to aid interpretation
of soil description.
AT L) ALASKA TESTLA6
Table B WO CA19747
Test (tole 12 Date: 4/23/81
Logged by: 0t•111
Depth in Feet
From To Soil Description
0.0 2.0 Brown Peat, (Pt)
2.0 8,0 F-4, Grey Gravelly Sandy Silt
8.0 15.8 F-2, Brown Silty Fine Sand
15:8 21,5 F-4, Brown to Grey Sandy Silt, (ML), stiff,
layered with F-2, Brown Silty Fine Sand, (SPS),
medium dense, poorly graded
Bottom of Test Hole: 21.5'
Frost Line: 1.5'
Free Water Level: 2.0'
Sa.
Blows/6"
tit
Type of
Sample
Dry
Strencrth
Grou
Unified
Temp.
`'O
No.
Depth
1
5-6.5'
7/10/12
16.3
STD.PEN.
M/H
II
-.ML
39
2
10-11.5''
10/17/28
22.1
STD.PEN.
N
C
SM
41
3
15-16.5'
21/32/35
19.9
STD.PEN.
VL/N
A
ML -SM
42
4
20-21.5'
13/33/37
24.7
STD.PEN.
VL/N
A
PSL -SM
43
Group classification refers to grouping by visual identification,
this exploration only.
Refer to explanatoryy information attached to aid interpretation
of soil description.
(7A -Tl-) ALASKA TESTLA6
Test liole 13 Table C WO #A19747
Date: 4/23/81
Logged by: MIR
Death in Feet
From To Soil Description
0.0 8.0 Brown Peat, (Pt), saturated, soft
8.0 12.0 F-4, Grey Sandy Silt, (ML), moist, stiff,
NP
Bottom of Test Hole:
12.0'
Frost Line:
2.0'
Free Water Level:
2.0'
Sa.
Type of
Dry Temp.
No. Depth Blows/6"
M%
Sample
Strength Group Unified F°
1 12.0' ---
21.1
Grab
M/1I A ML --
Group classification refers to grouping by visual identification,
this exploration only.
Refer to explanatory information attached to aid interpretation
of soil description.
i
a
CA -T- ALASKA TESTLAS
Test Hole 94
Depth in Feet'
From To
0.0 2.5
2.5 13.0
13.0 16.5
Bottom of Test Hole:
Frost Line:
Free Water Level:
j Sa.
No. Depth,
1 5-6.5'
e:
i' 2 10-11.5'
t' 3 15-16.5'
FS
j
Table D WO IA19747
Date: 4/23/81
Logged by: OWI
• Soil Description
Brown Peat, (Pt)
F-4, Grey Sandy Silt, to Silt (ML), NP to
PL-, moist, stiff with a 1 foot Sand layer
at 7.5' - 8.5'
F-4, Grey Gravelly Sandy Silt, (ML), NP,
moist, hard, 3" +
16.5'
2.0'
7.5'
Type of
Blows/6" 1.1% Sample
--- 16.8 STD.PEN.
12/11/22 19.5 STD.PEN.
25/57/117 17.9 STD.PEN.
Dry
Strength Groue Unified
L/M A ML
L A ML
L D ML
Group classification refers to grouping by visual identification,.
this exploration only.
Refer to explanatory information attached to aid interpretation
i-. of soil description.
Temp.
F°
37
40
44
T l_ ALASXA TESTLAR
I
Test 110le
15
Table E / WO JA19747
( Date: 4/22/81
Logged by: OMH
1
'
Depth
in Feet
Soil Descri tion
Fro
1
0.0
2.0
Brown Peat, (Pt)
5.5
F-4, Brown to Grey Silt, (ML), PL+, stiff,
2.0
moist
F-2, Grey slightlySilty fine Sand, (SM),
5.5
9.0
medium dense, poorly ed
`
F-4, Grey Silt, (PLL), NP, moist, stiff with
9.0
18,0
occasional sand layers or.lenses
18.0
21,5
F-4, Grey Silty fine Sand, (SM), saturated,
graded, layered with
medium dense, poorly
Grey Silt, (ML) , NPS stiff
Bottom of Test
Hole:
Frost
Line:
Free Water Level:
Temp.
Sa.
Type of Dry
Blo_ k Ft$ Sam le Strep th Group Unified
F
(
No.
Depth
A/C ML/SM
38
1
5-6.5'
4/9/17 23.0 STD.PEN. N
r
'
10-11.5'
18/22/18 18.4 STD.PEN. VL/N A ML
40
2
3
15-16.5'
12/22/20 18.6 STD.rEN. VL/N A ML
4'
4
20-21.5'
12/27/31 21.7 STD. i'l:fd. M A/C M11
'2
rcfcrs to grouping by visual iacntif.icatiun,
Groai: cla::sificntion
this ex11301-ation only.
infcnria.Itioii a..tacho:1 to aid interpretation
i
kefcr
to oxpl:ui,�tor�
of
soil description-
A T ALASKA TESTLAB
Test Hole 96
R -C t et
From To
0.0 8.0
8.0 12.0
. b.;,
Table F WO JA19747
Date: 4/23/81
Logged by: O:SH
Soil Descri tion
Brown Peat, (Pt), saturated, soft
F-4,
GLey Silt, (ML), trace sand, NP, moist,
stiff
Bottom of Test Hole:
12.0'
Frost Line
2.5'
Free Water Level:
' 2.5'
Temp.
Type of Dry �__
Sa. Sample Stren th Grou Unified
27� D — Bloom M� — ML ---
1 121 _ ___ 20.0
Grab M A
isual identification,
Group
classification refers to grouping by v
this exploration only.
explanatory information attached to aid interpretation.
Refer to e�=P
of Soil description.
A 7 L ALASKA TESTLAS
i
Test Hole 17
Depth in Feet
From To
0.0 10.0
10.0 15.0
Table G WO #A19747
Date: 4/23/81
Logged by: OMH
Soil Description
Brown Peat, (Pt), saturated, soft
F_40
Grey Sandy Silt, (ML), NP, moist, stiff,
Silt Sand, (SM)
red with F' , saturated,
laye
medium dense, Poorly y g raded
Bottom of Test Hole: 15.0'
Frost Line:
2.0'
Free Water Level:
2.0'
Type of
Sa.. •Bloom /6" Dia Sample
No
No. Depth
1 15, 35.1 Grab
Dry Unified
a,, n� 2rpuR.
VL/N A DSL
Group classification refers to grouping by visual identificationt
this exploration only.
Refer to explanatory information attached to aid interpretation
of soil description.
Temp.
F"
A T L ALASKA TESTLAB
M
Table H WO #A19747
Test Hole IS Date: 4/23/61
Logged by: OMH
Depth in Feet
From To Soil Description
0.0
8.0 Brown Peat, (Pt), saturated, soft
8.0 12,0 F-4, Grey Sandy
Silt, (ML), NP, stiff, moist
Bottom of Test Hole: 12.0'
'Frost Line: 2.0'
Free Water Level: 2.0'
Type of Dry
Sa.
N_, Depth Blows/6" w= MS Sample Strom th Grou Unifie
1 12' ---- 17.6 Grab M/11B'
Group classification refers to grouping by visual identification,
this exploration only.
Refer to explanatory information attached to aid interpretation
of soil description.
Temp.
FO -
ALASKA TESTLAB
Test Hole 19 Table I WO 9A19747
Date: 4/23/81
Logged by: OMH
Depth in Feet
From To Soil Description
0.0 8.5 Brown Peat, (Pt), saturated, soft
8.5 10.0 F-4, Grey Sandy Silt, (ML), PL+, moist;
stiff
Bottom of Test Hole: 10.0'
Frost Line: 2.0'
Free 1 -later Level: 2.0'
e -AT h AI.ASKA TFSTLAB
vin iri I
K
n�
° ilm
flO
M
IX
I c ,
�G�Ic I I
z0 4.9
!
rn B; Ll E— I I lug
1
y�c4�rtTE
rolef
rIO C7
�I2eF
L -, N O p
C
f doEE
rcy
I I •1
cis 0% in in
• OT Q>1 °Irl lf-1
I I^I I L I I
�' I v N •O p p l �.! C Q1
n N � I" 1 � A� . f• v I_ H fN.l
CO
JI•b Iw i• Y11 •>0) Illp Y)•
too
plil.1
coo
I.
� I,. *i,
ki
I !�I :;:iW 1::: 1 1
P1, Miilll!III�1W!" I�
II I;I!I�
i
I I III
II
a
III
r
I;II
I
4,11
viii I=,II
•1
��11;1� IIIi111 ii�ll� IIII
'III
.; 1 I III I i 1111 1 1 IIII .I ,
•/� : I I I . I ( I 1 I I� -I1 IIII III TI I 'III 11
1
•iIi t•'• 'Ili :10I 11 11 " .Ili 1111 Ijl1 11.1
,I mil IIII Itil IIII II^IIiI;I IIII 11.1 II'•Ii�[t
',c 'I•!•.�I ,1 i'Ti .1 I"i !t; lil•
I'�ii ::1. •,.�r..rilt�,' �.......
iI :Ii;�llll i;i� 'I,I •1 _ iI I
:r, 1. :.i. 1• _�- i'Ti. :illj�,rlllll
111' tt ..� .-..... .-.,_ .•:
.....:
IIS 1 • 1 •• ' iII. 1,1 rj1 I:1.",
I„ •JJ - � _
a 441 -i.
7 7
7�a
�2 cF
J d O Y
CSO'
E n C.
r O O
Vc�N.So
ON
a.�m
o w�ao t�1 t•1u>, vi v
oo� �
�wlfv of .+ O.hI OIs 8
MI'i^lijl:. rt Q O
0
� w1
Al
l j - J
0
•� raw.• �w 1f • �
v
r �
pa% m
� 1 Y
_=
Nl4a
`^ c
A
z.
y$QF
j�
a 441 -i.
7 7
7�a
�2 cF
J d O Y
CSO'
E n C.
r O O
Vc�N.So
ON
a.�m
o w�ao t�1 t•1u>, vi v
oo� �
�wlfv of .+ O.hI OIs 8
MI'i^lijl:. rt Q O
0
� w1
Al
l j - J
0
•� raw.• �w 1f • �
Fr.,
K-0
N
N
v
N
cJ
Imo; uou
C uv.E WE
L G G
Y" u Z �• w w
r
r
r
f=lam
Y
r N
vlv
rCO
CO
'
Q
M
1
�
' A
cV .
x
,d��
�3caF
Y" u Z �• w w
r
r
r
f=lam
Y