HomeMy WebLinkAboutARNETT S-4288
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
November 30, 1976
W.O. #9524
Mr. Maurice P. Oswald
DOWL Engineers
4040 "B" Street
Anchorage, Alaska 99503
Subject:
Subsurface Investigation for Suitability of On-Site
Sewage Disposal Systems - Russell E. Arnett Property
Located Near O'Malley Road at Hide-away Trail
Dear Mr. Oswald:
Transmitted herein, in accordance with your instructions, are the
results of the above referenced investigation as performed by us
on November 16 and 17, 1976. The scope of this project is to
investigate the site for suitability of on-site sewage disposal
systems.
Included in this transmittal are:
Test Hole Location Sketch
Test Hole Logs
Standard Explanatory Information
Figure 1
Table A
Sheets 1-3
The exploration was conducted using a Nodwell mounted Mobile
Drill B-50 drill rig with a continuous flight, solid stem auger.
The rig is owned and operated by Denali Drilling, Inc. The
drilling was supervised, the test holes logged and the percolation
tests performed by Mr. O.M. Hatch, Staff Geologist with Alaska
Testlab, and Mr. Mike Hewitt, Staff Technician with Alaska Testlab.
The test holes were placed at the approximate locations shown on
Figure 1. The logs of these test holes are included as Table A
of this report. In interpreting the data contained in the logs
it would be proved helpful to utilize the standard explanatory
information contained in Sheets 1-3 of this report.
It should be noted, due to the soil conditions encountered in
Test Hole #2, that a second site was drilled, Tes~ Hole #2A, on
that lot. The percolation test was performed in Test Hole #2A.
Mr. Maurice P. Oswald
November 30, 1.976
Page 2
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 holes were filled with water and left
overnight to saturate. On returning the next day, the holes were
refilled with water, and the drop in the water level carefully
monitored over the next 75 minutes for Test Hole #1 and 60 minutes
for Test Holes ~2A, #3 and 94.
This procedure is not a standardized percolation test, but we
understand that the Municipality of Anchorage, Department of
Public Health and Environmental Protection perfers to tests
performed in this manner to evaluate a site for proposed on-site
sewage system.
Using the above text the observed minimum percolation.rates were:
Test Hole #1 1.0 min./inch.
Test Hole #2A - 7.0 min./inch.
Test Hole #3 13.0 min./inch.
Test Hole ~4 13.0 min./inch.
No water table was observed in Test Hole #2 or in Test Hole #4.
The water level was detected at 15 feet in Test Hole #1 and in
feet at the interface of the granular soil and the finer grained
soil. This is not unusual and should not be interpreted as the
water table. It should also be remembered, though, the water
table in any given area will fluctuate with seasonal and climatic
changes.
We hope this report meets your present needs. If we can be of
further service, please feel free to contact us.
Sincerely,
ALASKA TESTLAB
Melvin R. Nichols, P.E.
Laboratory Manager
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Logged By: O.M. Hatch
Date: November 16, 1976
Test Hole
Table A
WO #9524
Depth in Feet
From TO
0.0 1.5
1.5 3.0
3.0 8.5
8.5 16.0
Soil Description
Brown peat, Pt, damp, soft.
F-4, brown sandy silt, ML, damp, stiff, NP.
NFS, brown ~andy gravel with a trace of silt,
GP, damp, medium density, 3" maximum particle
size.
NFS, brown gravelly sand with a trace of silt,
SP, damp to saturated, medium density, 1"
maximum particle size.
BOttom of Test Hole:
Free Water Level:
16.0'
15.0' ~
observed on surface
in vicinity of hole.
Sample Depth
1 5.0
2 10.0
3 15.0
Type of Dry
Blows/6" M% Sample Strength Group
G
G
G
Remarks:
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.
Logged BY: O.M. Hatch
Date: November 16, 1976
Test Hole #2 Table A WO #9524
Depth in Fee%
From To
0.0 3.0
3.0 16.0
Soil Description
Brown peat, Pt, damp, soft.
F-4, brown sandy silt, ML, damp,
stiff, NP.
Bottom of Test Hole:
Frost Line:
Free Water Level:
16.0'
Trace
None Observed
Sample Depth'
.1 5.0
2 10.0
3 15.0
Type of Dry
Blows/6" M% Sample Strength Group
G
G
G
Remarks:
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.
Logged By: O.M. Hatch
Date: November 16, 1976
Test Hole #4 Table A WO #9524
Depth in Feet
From To
0.0 2.0
2.0 16.0
Soil Description
Brown Peat, Pt, damp, soft.
F-4, brown gravelly sand~ silt,
stiff, NP, 2" maximum particle
ML/SM*, damp,
size.
Bottom of Test Hole:
Frost Line:
Free Water Level:
16.0'
Trace
None Observed
Remarks:
*Soils possibly
SM below 6' and
probably SM below
10'. Truck size
boulder observed on
surface in vicinity
of hole.
Sample Depth
1 5.0
2 10.0
3 16.0
Type of Dry
Blows/6" M% Sample Strength Group
G
G
G
Remarks:
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.
Logged By: O.M. Hatch
Date: November 16, 1976
Test Hole ~3
Table A
WO #9524
Depth in Feet
From To
0.0 2.5
2.5 7.0
7.0 16.0
Soil Description
Brown peat, Pt, damp, soft.
F-4, brown sandy silt with & trace of gravel,
ML, damp, stiff.
F-2, brown silty sand with a trace of gravel,
SM, damp to saturated, medium density.
Bottom of Test H01e:
Frost Line:
Free Water Level:
16.0'
Trace
15.0'
~ample Depth
1 5.0
2 10.0
3 15.0
Blows/6" M% Sample Strength Group
G
G
G
Remarks:
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.
Logged By: O.M. Hatch
Date: November 16, 1976
Test Hole #2A
Table A
WO #9524
Depth in Feet
From To
0.0 2.0
2.0 7.0
7.0 12.0
12.0 16.0
Soil Description
Brown peat, Pt, damp, soft.
NFS/F-i, brown sand~ g~ravel with a few cobbles
and a trace of silt, GP/GM, damp, medium density,
12" maximum particle size.
F-2, brown gravelly silty sand, SM, damp to wet,
medium density, 3" maximum particle size.
F-2, brown silty gravelly sand, SM, damp,
medium density, 3" maximum particle size.
Bottom of Test Hole:
Frost Line:
Sample Depth
1 5.0
2 10.0
3 15.0
16.0'
Trace Remarks:
Thin wet zone at
interface of bottom
and top of less granuiaz
soil.
Type of Dry
Blows/6" M% Sample strength Group
G
G
G
Remarks:
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.