HomeMy WebLinkAboutGROLL Block 3 Lot 3
Alaska Testlab
4040 "B" Streel Anchorage, Alaska 99503
Phone (907) 27~1551
December 28, 1981
W.O. #A20258
( Telecopier (907) 272-5742
Alaska Land Development Services
4546 Business Park Blvd.
Anchorage, Alaska 99503
Attention: Mr. Bill Tucker
Subject:
Groll Subdivision, Lot 3, Block 3
Percolation Tests
Dear Gentlemen:
Transmitted herein are the results of test holes drilled on
the above referenced site for the purpose of an on-site
sewage disposal system. Test Hole #2 was previously drilled
and is referenced in the report dated December 9, 19810
Three additional test holes were drilled on December 24,
1981, utilizing a B-50 track mounted Nodwell drill rig using
a 6 inch, continuous solid flight auger. The drill rig is
owned and operated by Denali Drilling, Inc. Test holes weze
logged by Mr. Terry Barber, engineering geologist wit]]
Alaska Testlab. Grab samples were collected off the solid
flight auger, placed in plastic bags to preserve the natural
moistupe content, and returned to Alaska Testlab.
The site lies on a hillside grading southwest. It is
vegetated with thick alder, scattered birch trees, and Devil
Club (EchinopJnax h6rridum), which indicate wet surface soil
conditions. A thin organic mahte which is approximately
eighteen inches deep, overlies silty gravelly Sand (SM)
which becomes more gravelly with depth. All soils were damp
to wet but groundwater was only encountered while drilling
in Test Hole #3 at a depth of 9 feet. Test Holes ~4 and ~5
indicate the surface organic layer is wet to saturated with
the underlying soils appearing to be damp to wet.
The following day, December 24, ].981, water levels in each
test hole were measured from the ground surface. The fol-
lowing are the readings taken; Test Hole #3 - four feet;
Test Hole ~4 - three feet; Test Hole #5 - six feet.
December 28, 198].
Page Two
Because of the high water level, no percolation tests could
be run. Whether the observed groundwater is a surface or
subsurface soil condition could not be determined. A backhoe
trench might offer a better visual indication of where the
water is coming from. The observed groundwater levels are
expected to vary with seasonal changes in precipitation.
Ail locations of test holes are approximate only, due to the
thick vegetation growth which was not cleared prior to
taping or pacing.
Attached are the test hole logs, test hole location sketch
and explanatory information. If you have any questions,
please do not hesitate to contact us.
Sincerely,
roved:
Melvin R. Nichols, P.E.
Manager
TLB/kf'
Attachment(s)
ALASKA TESTLAB
-~erry L. Barber
Engineering Geologist
Test Hole ~3
Table A
WO ~A20258
Date: 12/23/81
Logged by: T. Barber
Depth in Feet
From To
0.0 1.5
1.5 10.0
Soil Description
Brown Peat
F-2, Brown silty gravelly Sand, angular to
subrounded particles to 1"+, wet, medium
dense
Bottom of Test Hole:
Frost Line:
Free Water Level:
Sample Number
1
2
10.0'
0.2'
9.0'
Sample Depth
4.0'
9o0'
Sample Type
Grab
Grab
Remarks:
3.
4.
5.
6.
Type of Sample, G=Grab, SPT = 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
Table A
WO #A20258
Date: 12/23/81
Logged by: T. Barber
Depth in Feet
From To
0.0 1.0
1.0 4.O
4.0 12.5
Soil Description
Brown Peat
F-2, Brown silty Sand with layers of sandy
silt
F-2, Brown silty gravelly Sand with layers
of sandy gravel, angular t~ subrounded par-
ticles to 1"+, wet, medium dense
Bottom of Test Hole:
Frost Line:
Free Water Level:
12.5'
0.2'
None observed
Sample Number
Sample Depth
Sample Type
i 8' Grab
Remarks:
3.
4.
5.
6.
Type of Sample, G=Grab, SPT = 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 Classi.fication, see Sheet 3.
Test Hole ~5
Table A
WO ~A20258
Date: ].2/23/81
Logged by: T. Barber
Depth in Feet
From To
0.0 1.0
1.0 6[0
6.0 18.5
Soil Description
Brown Peat
F-2, Brown silty gravelly Sand with sub-
angular 2"+ particles, wet
F-l, Brown silty sandy Gravel to 1"+
diameter, wet, medium to very dense
Bottom of Test Hole:
Frost Line:
Free Water Level:
18.5'
0.2'
None observed
Sample Number
Sample Depth
Sample Type
1 5.0' Grab
2 18.0' Grab
Remarks:
3.
4.
5.
6.
Type of Sample, G=Grab, SPT = 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.
//
I
I
I
I
Wayne Mabry
December 26, 1973
Page Two
B. The cases listed below meet with this Department's reco~nendation after review
of the information supplied or that information which was available in our files:
12)
S 3269 Swiss Alp Subdivision
Public sewer and water are not available. We have no objection, at the present
time, to granting preliminary approval on this case. All additional soil and
water availability data are to be submitted as the additional units come in for
approval. We have discussed one specific item with the developer and his
engineer and this is that we do want a drainage system built and the surface
water table rechecked prior to final approval of any development in the south-
east portion of this proposed plat. As shown by the soils test in ti~is area,
there is a high surface water table wi~ci~ will drastically affect the placement
and working of on-site sewer systems in this area. Tile soils 'tests, in general,
show a well-graded soil highly suitable for on-site waste disposal. Water avail-
ability data can be substantiated by wells in the surrounding area. However, it
will be substantiated by test wells'drilled within the subdivision as indicated
by the developer and his engineer.
~3) ~S 3276 Groll Subdivisio~ ~.
~ublic sewer and water are not available. The lot size, the soils conditions,
and water availability information indicate that the subdivision meets with out
Department's recommendation.
14) S 3261 Linda Vista Subdivision, Lot lA, Block C.
Public sewer and water are not available. Lot size, soil conditions, and water
availability via private wells are adequate in this area. This case meets with
our Department's reco~endations.
S 3260 Todd's Half Acre
Public sewer and water'are not available. We have no objection to the platting
of this single total owenership of land. We would note, however, that this lot
size does not meet our current standard for residential development of on-site
utilities.
16) S 3263 Robin Hill Subdivision, Unit No. 3.
This development plan was reviewed with the developer and his engineer some
three (3) months ago. Extensive work has gone into the development of this
unit to insure adequate sites for waste disposal, to insure that there are
adequate volumes of water available via individual wells and that t~e question-
able lands around the small ponds or lakes witi~in this unit have the lots lo-
cated around them such that adequate development can take place on all lots.
This plan meets with all requirements of this Division.
Z
/
'ON
o / ' °$%~-~e
'5¸
Ld
iii
__0
[I
/
/
/
/
/
~-~---~ (~) LB' g~ ~tN) M O0 ~0o
' DNI~8 dO
~]1 Vl~] ItA]III
//
//
I
/
/
/
A]71VA