HomeMy WebLinkAboutTract 02A
January 3, 1978
Phyllis Janke
Post Office Box 567
Eagle River~ Alaska
99577
Subject: Tract 2A Itighland Hills Subdivision
Permit ~77942
A permit issued by this department for well and/or sewer
system has expired°
Permits are issued on a calendar year basis~ as stated
on the permit~ by authority of Municipal ordinance°
If you have drilled the well, a well lo,q should be sent
to this department to document the installation date.
If there are any further questions, please contact this
office at 264-4720.
Sincerely,
Health and Environmental Protection
Sewer and Water Section
4040 "B" STREET,
ANCHORAGE, ALASKA 99503
PHONE: 907-279-2581
October 10, 1977
W.O.#: A18270
Joe Janke
South Side
Eagle River, Alaska
Subject:
Subsurface Investigation for suitablity of On--Site
Sewage Disposal System; Lot 22, Block 2, Highland
Hills #4 -AND-Highland Hills Itl, Rural Residence
Dear Mr. Janke:
This report gives the results of the above subject investigation as
performed by us on October 7, 1977. The scope of the investigation
was to determine the suitability of the sites for the installation
of an on-site sewage disposal system.
Included in this report are:
Test Hole Location Sketches
Test Hole Logs
Explanatory Information
Figures 1 and 2
Tables A and B
Sheets 1-3
The investigation consisted of a visual classification of soils exposed
by test pi_ts, previously dug by back--hoe. Soils classification was
performed by Alaska Testlab geologist. Logs of the test pits are
included as Tables A and B of this report. In interpreting the logs,
it would probably be helpful to use the explantory information of
Sheets 1-3 of this report.
Conclusions and Reco~nendation:
Lot 22, Block 2, Highland Hills #4: Our investigation of this
property indicates the high ground where the test pit was located
is ideally suited for the installation of an on-site sewage disposal
system. Soils are gravely sand and sand, with no evidence of a
water table. Soils of this type require a seepage pit abso]~tive
area of 100 square feet per bedroom (gravel sand) and 125 square
feet/bedroom (sand), respectfully.
October 10, 1977
W.O.#: A18270
Page 2
Highland Hills ~1, Rural Residence: Our investigation of this property
indicates the area where the test pit was located may possibly be
used for the installation of an on-site sewage disposal system.
A 3.5 feet layer of very dense sandy gravel overlays a gray, plastic,
silty gravel. The underlaying material appears unsuitable; however,
the course, clean upper layer of sandy gravel could possibly be used.
If your further work in this area indicates the sandy gravel soil
is thicker (deeper) than as shown by the test pit, this would improve
the possibility of construction the disposal system. Soil of this
type requires a minimum of 85 square feet per bedroom absorptive
area in the seepage pit, or leach lines. Because of the dense
nature of this poll at this location you may wish to use a slightly
more conservative figure of 125 square feet/bedroom. No water
table was observed during the investigation of the 'test pit. It
should be noted though, the free water level normally fluctuates
seasonally and with precipitation.
We hope this report meets y6ur needs. If we can be of further
service, please contact us.
Very truly yours,
ALASKA TESTLAB
T. A. Sexton
APPROVED BY: /~
Melvin R. Nicl~ol~, P.k.
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Test Hole Loi]l - Description Guide
The soil descriptions shown on the logs are the best estimate of the soil's
characteristics at the time of field examination attd as such do r~ot 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 thc following items:
Depth interval - usually shown to 0.1 foot, within that zone no
significant change itl 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 tile 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:
dr.S_, no or little apparent surface moisture,
damp, moisture forms portion of coio~, less than plastic Ii/nit,
16ke.~, no free water, often soft, if cohesive soil
saturated, free water may be squeezed out, ifa free draining soil;
~'~ at natural moisture content, if a non-plastic silt or fine
sand. {Thc moisture content is further definedby reference to PI,
LW, NP, M%or dilatency.}
Density refers to ]nore-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, loose, medium
dense, very dense. Genera] intent is to portray earthwork
characteristics.
Stiffness refers to more-ordess cohesive soils and fine grained silts of
~2y-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 Y', auger flights (minute-man) 2", Auger flights
(B-50 hollow stem) 6"-8". Larger particles are described indh-ectly 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 ~nust be considered for an indication of
larger particles.
Unified Soil Classification ~- This is a two letter code. See Unified
~~ther definition, ht 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,
P_l; natural moisture content believed to be less than plastic limit
PI+; natural moisture content believed to be between plastic and liquid
l~mit s
L~w+; natural moisture content believed to be greater than liquid limit
N~P; non-plastic, useful as a modifying description of some silty
mat~brials,
Dilatency_ - is the ability of water to migrate to the surface of a
satm-ated 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
discr~-~ p~ such as wood, coal, etc. as a modifier to an inorganic
soil. Quantity described as; trace, or an estimate of volmne, or, in case
of all organic, - as Peat. This may include tundra, muskeg and bog
material,
Muck - a modifier used to describe very soft, semi-organic deposits
u-~]~y occuring below a peat deposit.
Amorphus peat - organic particles nearly or fully disintegrated.
Fibrous Peat organic particles more-ordess 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 ~ce content, often will include ~nodified Unified
Classification for frozen soils this is a special case related to
permafrost studies.
Free Water Level -- The free water level noted dnringdrilling. This Is
not necessarily the static water table at the time of drilling or at olher
seasons. Static water table determination in other than very permeable
soils requires observation wells or piezometer installations, used only m
special cases.
Blow/6'~' The number of blows of a 140 ~veight free falling 30" to
advance a 2" split spoon 6": tile number of blows for a 12" advance is,
by definition, the standard penetration.
,d% natural moisture content of the soil sample, usually not
performed on clean sands or gravels below the water table.
S~P, refers to 2" split spoon driven into the soil by 140 pound
weight, a disturbed sample,
~, thin wall tube, "Shelby" used to obtain undisturbed samples
of fine grained soil,
.f,j., "grab" disturbed sample from auger flights or wall of trench,
g, cut sample, undisturbed sample from wall of trench,
Dry S[ten_kgt_~h -- a useful indicator of a soil's clayey fraction, N=Nonc,
L-Low, M=Medium, H=High
Group. - The samples are placed into apparently similar groups based
on color and texture and are arbitrarily assigned a group letter. Furthm
disturbed tests including Attcrberg Li~nits, grain size, moisture-density
relationship, etc, may be perfornted 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 determilrations and to reduce the
numher of quantitative tests necessary to describe the soil mass.
SOIL CLASSIFICATION CHART
30o~
GRAVEl_
CLAY
,k
r-~^vEv CLAYEY /
"%,}~-',/~\ I o ~ '\/
~-- -/-:-.--:;,,,: ........
oR /V,:- .,~x,
/ },:? /o I LT¥ / h
SILTY //:'\,/ ',\/ ~
/~.?/6P, AVELLY SAND
Sll_ ;)LAYEY
R
TY
SANDY GRAVEL
\
CLAYEY
SILTY
GRAVEL
SAND GRAVELLY SAND SANDY GRAVEL GRAVEL
/
0 10 20 30 40 50 60 70 80 90 ] O0
GRAVEL (+:~'4 SCREEN) % BY WEIGHT
NONFROSTSUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS TIIAN 3% FINER THAN 0.02 mm.
GROUPS, OF I':ROST-SUSCEPTIBLE SOILS:
F1 GRAVELLY SOILS CONTAINING BE'FWEEN 3 AN[} 20% FINER TIIAN 0.02 mm.
F2 SANDY SOILSCON-IAINING BETWEEN 3 AND 15% FINER THAN 0,02 mm.
F3 a. GRAVELLY SOILS CONTAINING MORE THAN 20% FINER -I-IIAN 0.02 mm. AND SANDY SOILS ,
(EXCEPT I:INESILTY, SANDS) CON]AINING MORE THAN 15% FINER THAN 0,02 mm.
b. CLAYSWITI4 PLASIICI]Y INDEXES OF MORETItAN 12. EXCEPT VARVEDCLAYS.
F4 a. ALLSILI'S INCLU[}ING SANDY SILTS.
b. FINE SILTY SANDS CONTAINING MORETtlAN 15% FINER TIfAN 0.02 mm.
c. LEAN CLAYS WITId PLASTICITY INDE'XES OF LESS -I ~IAN 12.
d. VARVI_-D CLAYS.
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