HomeMy WebLinkAboutBIRCH ROAD ESTATES Case S-4235
MUNICIPALITY OF ANCHORAGE
POUCH 6-650 ANCHORAGE. ALASKA 99502
PLANNING DEPARTMENT
Sept. 9, 1976
REQUEST FOR COMMEMTS ON SUBDIVISION
Gentlemen:
The Municipality of Anchorage has received a~pkications relating
to platting activity for the following cases.
S-4231 Broadwater Heights S-4250 G.A. Phillips Addition to
S-4232 Lot 13lA & 13lB Raymond Tedrow Subd
S-4233 Eagle Crest Subd # 3
~S-4234 Chugach Meadows. ~,, J
S-4235 Birch Road Estates~~''~
S-4236 DeBarr Vista # 8
S-4237 Northwood Park
S-4238 Grandview Gardens
S-4239 Eaton Park
S-4240 H. Grindle Subd
~-~ P~f~£red ~ ' ''
S4242 Third Addition
S-4243 Lots 30A & 30B
S-4244 Groller Sub
S-4245 Dimond Industrial & Teitze
S-4246 Kincaid Terrace
S-4247 Dowling Sub
S-4248 Fairview Subd
S-4249 Lots 47A & 47B
Attached are copies of the prgposed plats. Will ~ou pl~as~
submit your comments in writing, specifying any easements or
other requirements that your department or agency may need.
If we do not hear from you by September 24, 1976 we will
assume that you do not wish to submit any comments.
If you have no further use of the attached prints, please return
them with your comments.
Sincerely,
Planning Department
Enclosures
DEPARTMENT OF HF. ALTH AND ENVIRONMENTAL PROTECTION
PLATTING OR PLANNING AND ZONING CASE REVIEW
CASE NUMBER S-4235
PETITION FOR Rezoning
'Special Exception
VACAT I ON
RESUBDIVISION
Date Received
Comment to Planning by
COMMENTS:
OF
Birch'Road Es_rates -. Preliminary - a Subdivision of
-'-i~h~e'-N~- ~/'2 of the S 1/2 of SW 1/4 of the--~-~-T/4
located within Sec 23, T12 N, R 3 W, S.M..Alaska
containing 1 acres, 6 lots, 0 tracts.
f nleeting of
ENVIRONMENTAL SANITATION PUBLIC WATER NOT AVAILABLE
Mr. E.V. Smith
C.B. Ficke, Investments
Box 10023
Anchorage, AK 99502
4040 "B" STREET,
...... ANCHORAGE, ALASKA 99503
PHONE: 907-279.2581
October 1, 1976
W.O. #17853
Subject:
Percolation Tests for Lots 3, 4, 5, 6
Birch Road Estates
Dear Mr. Smith:
This letter is an addendum .to our report to you dated
September 22, 1976.
Sixteen foot deep test holes were drilled adjacent to the
%est pits previously logged.
When drilling was completed a 3/4" siot~ed 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 overtime to saturate.. :~On' r.e.tur'ning th~
next day, the hole was refilled with water and th~"drop in
the water ievei~carefully monitored over the ~next~95 minute's~.,-~,.
This procedure is not a Standardized'per~olationl test,..: c
however, we understand that the Municipality of Anch~a~'e',
~Department of Public Health and Environmental PrOtection'
prefers tests performed in this manner to evaluate a site
for a proposal on-site sewerage system.
Using the above test, the observed minimum percolation rates
were:
Lot 3
Lot 4
Lot 5
Lot 6
26.6 min/inCh /Q~~
~13.3 min/inch
-~10.0 min/inch
3 3.3 min/inch
Note the test hole on Lot 4 was on the east side of the lot
rather than by the previous test pit. The log of that test
hole is enclosed.
Sincerely,
MRN:rb
Enclosures
ALASKA TESTLAB
Melvin R. Nichols, P.E.
Laboratory Manager
Lot 3
TABLE A
'~0 %17853
.rate: September 16, 1976
Logged By: J. Mack
Depth in Feet
From To
0.. '0 ' -- 1 ,. 5 '
1.5' - 8.0'
8,.0' - 14.0'
Soil Description
Brown organic overburden and topsoil.
Brown interbedded .silty gravels, GM, silty
sands, SM, silts, ML, and coarse gravels,
'GP, occasional cobbles, medium density.
F-4, brown gravelly silt, ML, stiff,' P1-.
Bottom of Test Hole.:
Frost Line:
~ree Water Level:
'14.0"
.None Observed
'None Observed
Lot 4
Birch Road Estates
-W~.O. 917853
Depth in Feet
From To
0.0' - 1.0'
1.0' - 2.0'
2.0' - 16.0'
Date: September 29, 1.976
Logged By: O.M. H~tch
Soil Description
Brown Peat, Pt, damp, soft.
F-4, Brown Sandy Silt, ML, damp, soft to
stiff, NP.
F-4, Brown Gravelly very Sandy Silt, ML,.
damp, stiff, NP, particles to 3", could be
SM to 11.0' marginal.
Bottom of Test Hole:
Frost Line:
Free Water Level:
1~6.0'
None Observed
None Observed
4040 "B" STREET,
AI~CHORAGE, ALASKA 99503
PHONE: 907-279-2581
September 22, 1976
W.O. 917853
Mr. E.V. Smith
C.B. Ficke, Investments
Box 10023
Anchorage, AK .99502
Subject: Test Pits for Birch Road Estates
N.1/2, S.1/2, SW 1/4, NW 1/4, Section 23, T,12 N.,
R.3 W., S.M. Alaska
Dear Mr. Smith:
As requested we logged the four test pits on Lots 3, 4, 5,
and 6 of Birch Road Estates on September 16, 1976.
The test pits were dug using a Drott 40 backhoe furnished by
you. Digging of the test pits was supervised, and the test
holes logged by Mr. J. Mack, senior ~echnician with Alaska
Testlab.
The test pits are located on the en61osed Figure 1. The
logs of the test holes are included as T~ble A. It may
prove helpful in interpreting the data on the test hole logs
to read the standard explanatory information contained in
this report as Sheets 1-3.
The test pits were logged visually only. No samples were
brought to the laboratory to verify the classification of
the soils.
If we can be of further assistance or offer clarification .
please do not hesitate to contact us.
Very sincerely yours,
ALASKA TESTLAB
Melvin R. Nichols, P.E.
Laboratory Manager'
MRN:rb
Enclosures
Lot 4
TABLE A
WO 917853
Date: September 16, 1976
Logged By: J. Mack
Depth in Feet
From To
0.0' - 1.5'
1..5' - 7.0'
7.0' - 16.0'
Soil Description
Brown organic overburden and topsoil with
few cobbles.
NFS/F-l, brown silt~ sand~ gravel, GM,
medium dense with layers of clean, coarse
~ravel, GP, with gravel layers approximately
25% of layer.
F-4, brown gravell~ ~ilts, ML, stiff, P1-.
i~ottom of Test Hole:
'Frost Line:
Free Water Level:
16.0'
None Observed
None Observed
Lot 5
TABLE A
wO 917853
Date: September 16, 1976
Logged By: J. Mack
Depth in Feet
From To
0.0' - 1.5'
1.5' - 9.0'
9.0' - 15.0'
Soil Description
Brown organic overburden and topsoil.
Brown interlayered coarse gravel, GP,
silty sand, SP/SM, and silt, ML, with 75%
of layer GP or SP and 25% SM or ML,
occasional cobbles, low density.
F-4, brown silt, ML, few cobbles, damp,
stiff.
Bottom of Test Hole:
Frost Line:
Free Water Level:
15.0'
None Observed
None Observed
Lot 6
TABLE A
9 917853
Date: September 16, 1976
Logged By: J. Mack
Depth in Feet
From To
0.0' - 1.5'
1.5' - 6.0'
6.0' - 15.0"
Soil Description
Brown organic overburden and topsoil, dry,
soft.
F-l, brown coarse silty sandy gravel', GP/SM,
damp, medium density.
F-4, brown sandy ~ravelly. silt, ML, damp,
stiff.
Bottom of Test Hole:
Frost Line:
Free Water Level:
15.0'
None Observed
None Observed
SOIL CLASSIFICATION CHART
30% GRAVEL
CLAY
CLAYEY
CLAYEY
OR SILTY
SILTY
SAND ~
SAND SANDY GRAVEL
SAND GRAVELLY SAND GRAVEL GRAVEL
0 1 0 20 30 40 50 60 70 80 90 1 u0
GRAVEL (+#4 SCREEN) % BY WEIGHT
NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN 0.02 mm.
GROUPS OF FROST-SUSCEPTIBLE SOILS:
F1 GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mm.
F2 SANDY SOILS CONTAINING BETWEEN 3 AND 15% FINER THAN 0.02 mm.
F3 a. GRAVELLY SOILS CONTAINING MORE THAN 20% FINER THAN 0.02 mm. AND SANDY SOILS
(EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
b. CLAYS WITH PLASTICITY INDEXES OF MORE THAN 12. EXCEPT VARVED CLAYS.
F4 a. ALL SILTS INCLUDING SANDY SILTS.
b. FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
c. LEAN CLAYS WITH PLASTICITY INDEXES OF LESS THAN 12.
d. VARVED CLAYS.
Test Hole Lo~l - Description Guide
The soil descriptions shown on the logs are the best estimate of the soil's
characteristics at ihe time of field examination and as such do not achieve the
precision of a laboratory testing procedure, if the log includes soils samples,
those samples receive an independent textural classification in the laboratory
to verify the field examination.
The logs often include the following items:
Depth Interval - usually shown to 0.1 foot, within that zone no
significant change in soil type was observed through drill action, direct
observation or sampling.
Frost Classification - NFS, Fl, F2, F3, F4, see "Soil Classification
Chart"
· Texture of Soil - An engineering classification of the soils by particle
size and proportion, see "Soil Classification Chart", note the
proportions are approximate and modifications to the soil group due to
stratification, inclusions and changes in properties are included.
Moisture Content - this is a qualitative measure:
dry, no or little apparent surface moisture,
damp, moisture forms portion of color, less than plastic limit,
wet, no free water, often soft, if cohesive soil,
saturated, free water may be squeezed out, if a free draining soil;
dilatent at natural moisture content, if a non-plastic silt or fine
sand. /The moisture content is further definedby reference to Pi,
LW, NP, M%or dilatency.)
Density - refers to more-or-less non-cohesive soils, such as sand gravel
mixtures with or without a fine fraction, derived from drilling action
and/or sample data; usually described as: very loose, 16oSe, medium
dense, very dense. General intent is to portray earthwork
characteristics.
Stiffness - refers to more-or-less cohesive soils and fine grained silts of
t e~cla~-silt groups. Derived from drill action and/or sample data. Very
soft, soft, stiff, very stiff and hard are commonly used terms.
Particle size - The largest particle recovered by the split spoon is
1-3/8", Shelby tube 3", auger flights (minute-man) 2", Auger flights
(B-50 hollow stem) 6"-8". Larger particles are described indirectly by
action of the drilling and are referred to as cobbles, 3" to 8", or
boulders 8"+. Therefore when reviewing the gradation sheets, if any,
the description on the hole log must be considered for an~lndication of
larger particles.
Unified Soil Classification - This is a two letter code. See Unified
Classification sheet for fux[her definition. In some cases AASHO and/or
FAA soil classifications may be shown as well as the unified.
Atterberg Limits - useful for fine grained and other plastic soils.
Pi; natural moisture content believed to be less than plastic limit
PI+; natural moisture content believed to be between plastic and liquid
]V(~mits
L.__~; natural moisture content believed to be greater than liquid limit
. NP; non-plastic, useful as a modifying description of some silty
~at~rlals.
Dilatency - is the ability of water tO migrate to the surface of a
saturated or nearly saturated soil sample when vibrated or jolted - used
as an aid to determine if a fine grained soil is a slightly or non-plastic
silt or a volcanic ash.
Rock flour - finely ground soil that is not plastic but otherwise appears
similar to a clayey silt.
Organic Content - usually described as Peat, PT, sometimes includes
discrete particle'~ such as wood, coal, etc. as a modifier to an inorganic
soil. Quantity described as; trace, or an estimate of volume, or, in case
of all organic, - as Peat. This may include tundra, muskeg and bog
material.
~uck - a modifier used to describe very soft, semi-organic deposits
usu--~y occuring below a peat deposit.
Amorphus peat - organic particles nearly or fully disintegrated.
Fibrous Peat - organic particles more-or-less intact.
Bottom of Testhole - includes last sample interval.
Frost ·Line - seasonal frost depth as described by drilling action and/or
samples at the time of drilling.
Frozen Ground - other than frost line, described by samples, usually
includes description of ice content, often will include modified Unified
Classification for frozen soils - this is a special case related to
permafrost studies.
Free Water Level - The free water level noted during drilling. This is
not necessarily the static water table at the time of drilling or at other
seasons. Static water table determination in other than very permeable
soils requires observation wells or piezometer installations, used only in
special cases.
Blow/.6'.~ - The number of blows Of a 140 weight free falling 30" to
advance a 2" split spoon 6"; the number of blows for a 12" advance is,
by definition, the standard penetration.
M% - natural moisture content of the soil sample, usually not
p-~-rformed on clean sands or gravels below the water table.
Type of Sample -
SP, refers to 2" split spoon driven into the soil by 140 pound
weight, a disturbed sample,
S, thin wall tube, "Shelby" used to obtain undisturbed samples
of fine grained soil,
G, "grab" disturbed sample from auger flights or wall of trench,
.~, cut sample, undisturbed sample from wall of trench.
Dry Strength - a useful indicator of a soil's clayey fraction, N--None,
L--Low, M--Medium, H~High
- The samples are placed into apparently similar groups based
or and texture and are arbitrarily assigned a group letter. Further
disturbed tests including Atterberg Limits, grain size, moisture-defisity
relationship, etc. may be performed on the group and are assumed to
reflect the general distrubed characteristics of the soils assigned to the
group. This is an important phase of the soil analysis and is used to
standardize the various qualitative determinations and to reduce the
number of quantitative jests necessary to describe the soil mass.
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