HomeMy WebLinkAboutTURNAGAIN INDUSTRIAL PARK BLK 1 TR D1
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Z Fll.'l F'F:IH Z L ]:I::IR I.,.I]: 'I"H THE REQLI]: REHENTff; FOR ON-"= T TE :E;E].,IE:F?S I:::IN[:, F,IEL L.S; : -
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8.s I. SIf~EE'F
ANC~iORAGE, ALASKA 99501
(907) 264-4111
December 31, 1979
Jokiel Construction
Box 10-267
Anchorage, Alaska 99511
Permit ~
~ 790150
Subject: Tract D Turnagain Industrial Park Subdivision
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 log should be sent
to this department to document the installation date.
If an enginee~ has inspected the installation of the
on-site sewer system, please have them send us the as-builts
for our files.
If there are any further questions, please contact this
office at 264-4720.
Sincerely,
Les N. ~Buchholz, R.S. ~
Senior nnvironmental Speci~%~lst
LNB/ljw
enc: Copy of Permit
4040 "B" ST R E ET
ANCHORAGE, ALASKA 99503
(907) 278-155~
May 2, 1979
W.O. A18870
Mr. Charles Wolfe
Wilder Construction Co.,
7741 East Fourth Avenue
Anchorage, AK 99504
Subject: Suitability for On-Site Sewage Disposal System
Tract D, Turnagain Industrial Park
Dear Mr. Wolfe:
On May 1, 1979, a test pit was excavated on the subject
site, using a bgckhoe. The pit was logged and the soils
visually classified by R. Mark Hansen, enginaer with
Alaska Testlab. The log of the test pit is included as
Table A. For an explanation of the terms used in the
log, please refer to Sheets 1-3. The test pit location
was just north of the proposed building location.
Ground water was encountered at 11 feet in the test pit.
This means the proposed soil absorption system must be
constructed no deeper than 7 feet in order to maintaio
the four-foot clearance between the absorption trench
and ground water as required by state regulations. The
topography is very flat, with no obvious slope.
The Sa~d (SP) in the upper 7 feet should allow rapid
percolation of the effluent, however, fine sands sometimes
tend to clog with time. We recommend a maximum effluent
application rate of 2.2 gallons per square foot per day,
even though clean water would percolate much faster. This
would correspond to a percolation test rate of 5 minutes
per inch.
Wilder Construction Co., Inc.
May 2, 1979
Page 2
We trust the above meets your present requirements. If
you have any questions, please do not hestiate to call
Very sincerely,
ALASKA TE S TLAB
R. Mark Hansen
Approved by:
Melvin R. Nichols,
Laboratory Manager
RMH:mfm
Attachments
PE
Test Pit #1
Table A
WO #A18870
Date: 5-1-79
Logged by: R.M.Hansen
Depth in Feet
From To
0.0 7.0
7.0 12.0
Soil Description
NFS gray.Sand (SP) with tra6e Gravel to 1"
and trace Silt,.fine grained, 'low to medium
density, dry to damp.
F-2, gray to brown Sand with Silt lenses
fine grained, medium density, damp to
saturated.
(SM) ,
Bottom of Test Hole:
Frost Line:
Free Water Level:
12.0 ft.
None observed
11.0 ft.
[4 0
]]AHO
Test Hole LoS - Description Guide
The soil descriptions sh.wu on the lngs are the belt estimate of the ioil's
characteristics at tile 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 all 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, disect
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 "Soft Clas$ification Cbart", note the
proportions are approximate and modifications to the soil group due to
stratification, inclusions and changes in properties are included.
Moisture Content - this is a qualitative measure:
dry, no or little apparent surface moisture,
damp, moisture forms portion of color, less than plastic limit,
wet, Ilo rice water, ofien soft, if cobesiqe soil,
saturated, free water may be squeezed out, ifa free draining soil;
sand. (The moisture content is further deflnedby reference to PI,
LW, NP, M% or dilatency.)
Density - refers to more-or-less non-cohesive soils, such as sand gravel
mixtures with or without a fine fraction, derived from drilling action
and/or sample data; usually described as: very loose, loose, medium
dense, very dense. General intent is to portray earthwork
characteristics.
Stiffness - refers to more-or-less cohesive soils and fine grained silts of
the clay-sih groups. Derived from drill actiou and/or sample data, Very
soft. soft, stiff, very stiff and bard are commonly used terms.
Particle size - The largest particle recovered by the split spoon is
1-3~8", Shelby tube Y', auger flights (minute-man) 2", Auger flights
(B-50 hollow stem) 6"-8". Larger particles are described indirectly by
action of tile drftling a~xd are referred to as cobbles, 3" to 8', or
boulders 8"+. Therefore when reviewing the gradation sheets, if any,
the description on the bole log must be considered for an indication of
larger particles.
Unified Soil Classification - This is a two letter code. See Unified
Classification sheet for further definition. In some cases AASHO and/or
FAA soil classifications may be sbown as well as the unified.
Atterberg Limits - useful for fine grained and other plastic soils.
P_l; natural moisture content believed to be less than plastic limit
PI+; natural moisture content believed to be between plastic and liquid
~nit$
NP; non-plastic, useful as a modifying description of some silty
Dilatency - is the ability of water to migrate to the surface of a
saturated or nearly saturated soft sample when vibrated or johed - used
as an aid to determine if a fine grained soil i~ a sligbtly or non-plastic
silt or a volcaldc ash.
Rock flour -- finely ground soil that is not plastic but otberwise appears
similar to a clayey silt.
Organic Content - usually described as Peat, PT, sometimes includes
discrete particles 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.
Muck -- a modifier used to describe very soft, semi-organic deposits
usually 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 iutervah
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, usual]'/
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 - Tbe free water level noted during drilling. Tbis i~
not necessarily the static water table at the tbne of drilling or at other
seasons. Static water table determination in other tban very permeable
soils requires observation wells or piezometer installations, used only in
special cases.
Blow/6" - The number of blows of ~ 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.
,d% - natural moisture content of the soil sample, usually not
performed on clean sands or gravels below the water table.
Type ofSamrn~EL~le -
S__P, refers to 2" split spoon driven into the soil by 140 pound
weight, a disturbcd sample,
..~ thin wall tube, "Shelby" used to obtain undisturbed samples
o£ fine grained soil,
C,, "grab" disturbed sample ftom auger flights or wall of trench,
C, cut sample, undisturbed sample from wall of trench.
Dry Streng~ - a useful indicator of a soil's clayey fraction, N=None,
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. Further
disturbed tests including Atterberg Limits, grain size, moisture density
relationship, etc, may he performed on tile group and are assumed to
reflect tbe general distrubed characteristics of the soils assigned to tile
group. This is an important phase of the soil analysis and is used to
SOIL CLASSIFICATION CHART
30% GRAVEL
G I~,%~A V E L
40 50
(+#4 SCREEN)
60 70 80
% BY WEIGHT
9O
~r~nS- ~'~A.~._ IBLE SOlidS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN 0.02 mm.
GROUPS OF r~ROS i-~L)SCEPTIB~-E SO
F1 GRAVELLY SOIL'S C~)NTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mm.
cA~lr~v SOILS CONTAk'INING BETWEEN 3 AND 15% FINER THAN 0,02 mm.
F2 ~.~/~_LLY SOILS Co~TAiNiNG MORE THAN 20% FiN ER THAN 0.02 mm. AND SANDY SOILS
F3 a.
(EXCEPT FINE SILTY, ~,A~NDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm.
b. CLAYS WITH PLASTICIT\/!NDEXES 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 PLASTIClI'¥ INDEXES OF LESS THAN 12.
d. VARVED CLAYS,
lU0
