HomeMy WebLinkAboutLAKE SHORE Soils Information
FROM:
TO:
GREATER ANCHORAGE AREA BOROUGH
DEPARTMENT:E. nv~.r.o.n~te;t~a.] ....QU.~].3~;y SUBJECT: .. P....tea.s e..- s.ee...-.b-e]
INITIATED BY:R01 f....S~r.~.ckland,--R.S-,-~.~.-.-Ass-t-.,-..-.D--i--~ DATE OF MEMO: A-ugus~. -~ ., -~-] -9 7-1-
DATE ANSWER
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GEOLOGIC SOIL INVESTIGATION
OF
LAKE SHORE SUBDIVISION
July, 1971
Report to:
Mr. H. M. Newell
Prepared by:
HEWITT V. LOUNSBURY & ASSOCIATES
723 West 6th Avenue
Anchorage, Alaska
INTRODUCTION
This report is the result of our field geologic and soil investigation
conducted July 28, 1.971, on theproposed Lake Shore Subdivision Site; legal
description: Northwest one-quarter, Section 10, Township 12 North, Range 4
West, Seward Meridian. The Lake Shore Subdivision is a'newly proposed resi-
dential area being planned without the benefits of public water and sewer
utilities. It will therefore be the responsibility of each lot owner to provide
for on-site sewage disposal facilities and a potable water supply.
The sewage disposal units will consist of conventional septic tanks draining
into a-seepa§e pit andt~or drain fi~elds. The water source will be from individually
drilled and cased wells.
The purpose of this investigation was to define in detail the soils conditions
existing at the above mentioned subdivision in order to help us in ~e~erm].nethe
'area requirements for proper sewer seepage in the particular soil found.
INVESTIGATION
Our'investigation consisted of a review of all available geologic data per-
taining to this area followed by three hand test borings which are indicated by
the dots on the enclosed plat.
A more extensive drilling program was not initiated on this property because
of the apparent consistency of the soil strata.
L ,
SUBSURFACE SOILS AND CONDITIONS
Specific types and depths of soils and conditions are shown on the enclosed
typical cross-section. -The soils were found to consist of basically sandy materials.
Under the 1 to 2 inch layer of leaf mulch there is, in two of the test locations,
a layer of 0.5 feet to 0.8 feet thick of light brown, silty sand with some roots;
test location No. 1 has a 1.4 foot depth of sand before the light brown layer. At
the test locations Number 1 and 2, where the disposal systems would be located,
there is a layer of undetermined depth of silty sand following the light brown layer.
It is in this last layer of silty sand that the septic Systems should be located.
No frozen soils were found and no ground water table was encountered.
CONCLUSION
From the information gathered during our investigation we conclude that the
soil conditions are suited for the proposed residential development. On-site sewage
disposal systems should consist of septic tanks with seepage pits or drain fields.
The seepage area requirements for individual systems based upon a 2 foot cover
will be 250 square feet per bedroom.
If normal precautions are followed, the lot sizes proposed in the Lake Shore
Subdivision~ are more than ample for the type of develppment proposed.
Respectfully submitted,
· Charles W. Wainwrio~ht, T~hnic~an
Q.~o~'en H. LouYFsb~'ry, P.E./
_Date Begun
~ate Completed
~ro]act N~
. ?roject Name
Location /'
4ethod Used
. field PaTty
Sompl?n9
Geologist
DESCRIPTION
Soil type, color, texture,
estimated particle
sampler driving nate$~
de~Tn~ circulaM~n Io~t,
not~s on drdlln9, ea$e~
bil~ ~ed,
Hole Na.
Sheet ' '~ of
Total Depth . ? M:
IDT Ground
epth in Ff
Dat~ I
£ocation Notes £ Diagram;
Y/o/er Table
Unles_~ oM~rv/ise noted oil somples :re taken v:/I.4'?O Standard Ponetra//on Sornolar driven ~¢/140 lb. hammer 50" dro~.
D, e Begun ,.
Dote Completed
Method Used ' ~'
~ampling
LOG OF TEST HOE/lNG
Hew/t/ V. Lounsbury ~ Associates
Engineers -- Surveyors
t~nchorage~ . Alaska
Geologist
DESCRIPTION
Soil type, co/or, texture,
est/mated particle size¢
sampler driving no/es,
depths c/TculoM~n Iost~
notes on drilling ease,
bits used, etc.
Hole No. (-'
Sheet >7 of ,:7
Total Depth *:] ,/ *~
Ground Wot~r Table
Depth in FL
T/me
Date
LocahDn Notes £ D/agrQm:
~,ata Completed . ~,..~/~/ .. Hew/It ~ Lounsbury ~ Assoc/
~/g N~ Eng/'n~ers -- Surveyors
roject No
Project Name '
, 'eth~d Used
Field'Partx , -~ /' "" ~ ,, ' ' '- ' ~ ~"~ G~ologist
~a/her '~. ~ i'~ .; ~ ' ' "' ~ ' ~ ....
Hole No
Sheet
Total Depth ~-! j.L
ID Ground
epth !~ Fi
~Tirne
Water Table
Soil type, co/or; texture, I '
estimated parHcle size, [ '
sampler drlving notes;
~ ? de,~.~s circu/o/ion /os,,
notes on drilling eqse~ .... ~-~ ~.'; ~,~.~? ~ ., , '
bits used~ etc. .:
_.,'-"'" --_r"" ~ .'' '.
'" ' ..... "'~ ". ' '
L:_P.,'' i~ro~,~ Cup
r.) Iron Pip~
o Sioal Pin
I ~,~reby certify that a survey of Lot ............... ~ ~ Block
Subdivision was mad~ on_~_L~_Z.~ ...... and
h' 'J (lo r]o[ overlap or uflcroach ot3 Ih~ [)lo[tufty JyJRg adjacent there[o,
ti ,', m) improvements on p~o[)erty I,/in(] adjacent thereto encroach on
Jif ,s or other visible easemen(s on said prol)erty except as indicated
D,:led at Anchorage, Alaska, this ~__(lay of Z-'4~>-
E()NSTRUCTING ENGINEERS
~O'UTIMT¥ EASEMENT TO BE AUTO-
MATICALL¥ TERMINATED IF EX(STING :
PLANT FACILITIES ARE ABANDONED
OR TERMINATED.
SAND
LAKE
W.8OTH AVENUE ~g ~,/~ x ,A~L.:ET
~ oo ~~
LE6END
EXISTING REBAR
NOTE:
NOTAEY'S ACKNOWLEDGEMENT
PLAT APPROVAL
DTIOO0902
CONTAINING 2.665 ACRES MORE OR LESS
LAKE SHORE SUBDIVISION
LOCATED IN
NW I/4,SEC.IO, T 12 N, R 4 W, S
0TI000903
DTI000904
1971- 580
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*NOTES
07'1000905
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