HomeMy WebLinkAboutBOB WEST S-5555
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION
ENVIRONMENTAL HEALTH CASE REVIEW WORK SHEET
I~J PLATTING BOARD ~-J PLANNING & ZONING
CASE NUMBER NAME
S-5555 Lots 1 - 3 Bob West Subdivision
DATE RECEIVED
January 2, 1981
COMMENT TO PLANNING BY
January 16, 1981
FOR MEETING OF CASE OF
~PUBLIC WATER _N_Q.L_AVAI LABLE TO PETITION AR EA
~_IC SEWER NOT AVAILABLE TO PETITION AREA
71-014 (Rev. 2/78)
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION
ENVIRONMENTAL HEALTH CASE REVIEW WORK SHEET
[~] PLATTING BOARD [] PLANNING & ZONING
CASE NUMBER NAME
S-5555 Lots 1 - 4 Bob West Subdivision
DATE RECEIVED
April 1, 1981
COMMENT TO PLANNING BY
April 16, 1981
FOR MEETING OF CASE OF
[~PUBLIC WATER NOT AVAILABLE TO PETITION AREA
~,P~UBLIC SEWER NOT AVAILABLE TO PETITION AREA
REVIEWER'S COMMENTS:
/
71-014 (Rev. 2/78)
GEOLOGIC SOIL INVESTIGATION
of
Government Lot S Section 22 T12N R.3W
MUNICIPALITY OF ANCHORAGE
DEPT. OF H:.~.'~L¥1t &
ENVIRONMENTAL IQO FECTION
OCT 1 9 ~'~
RECEIVED
S,M,
REFERRED TO AS BOB WEST SUBDIVISION
Prepared by:
804 East 15th Ave.
DOWLING AND ASSOCIATES
Suite #2
Anchorage, Alaska 99501
October 1981
/ ?'
TABLE OF CONTENTS
~',STTE~BESCR~PTTON
?.SUB-SURFACE SOILS AND CONDIT:~ONS
',i 'CONCLUS~!ONS
SOILS LOCATION MAP
'LOGS OF TEST HOLES
:',,:~iAD, 0 IT i FORMATION
ONAL IN''''''~' '
,17'. ~'.'. ; :' , I
INTRODUCTION
This report is the result of a field trip investigation conducted on October 10,
1981 on the proposed subdivision. This area located within Section 22, T12N, R3W,
S.M. Alaska, generally about 600 feet West along O'Malley Road from Birch Road.
This subdivision is a subdivision of Section Lot 3 intoi4-1.25 acre lots. The sub-
division is planned exclusive of public water and public sewer. The Bob West Sub-
division is a newly proposed subdivision surrounded by subdivided lands. It is
located on a hillside facing to the North. Development Of adequate sanitary facilities
will be the responsibility of the individual property owners. The sewage disposal
will consist of conventional septic tanks draining into a seepage pit and/or drain
field. Drawings from the Department of Health and Enviromental Protection, Munici-
pality of Anchorage have been included as a part of this report of the septic system
required. The water source will be from individually drilled wells.
The purpose of this report is to define the soils conditions within the property
and to determine the area requirements for proper sewer seepage in that particular
soil.
SITE DESCRIPTION
Bob West 'Subdivision is located off O'Malley Road about 600 {eet to the West on .
Birch Road. It consists of a 5.0 acre parcel 'of land to be~broken'into 4-1¼,1ors. -
The land slopes gently to the No~th on the lot. ,The 'land is in its'natural' state.,
?,'It!,is covered with Birch and Spruce'with little under brush'.
'The area seems to be.an excellant setting for four'units.'
A small stream runs to the North East of the property, and should not cause any
problems within the subdivision. The design of BorDnik Street will place the creek
within it's natural bed crossing O'Malley Road in the existing culvert to the East
of Bor~nik Street
SUB-SURFACE SOILS AND CONDITIONS
The surface of the soils found in this area is a very brown humus topsoil
with a moderate amount of organic materials in the top 6 inches. The light
colored humus is from 1foot to 1½ feet deep. This humus overlays a layer
of silty gravel or silty sandy gravel. The layering of soils indicates a
definate consistancy in soils with a wedge shaping to the layers. There is
a layer of very hard silt that is fairly deep in the south and higher part
of the subdivision, but is about 7 feet deep in the Northerly and lower area.
The materials between the surface and this impervious layer are good to excellant
for percQlation. The materials below this impervious layer would be fair to
good for percolation.
Most of the soil was loosely compacted very dry and without frost and mostly
larger rocks. A large rock is within ~the R,O.W. proposed for along lot 2 and
might show an indication that larger boulders may be present.
CONCLUSIONS
The 4 test holes on this property show that there is a consistancy in the
layers of the soils and they show the general type of the soils in the area.
The soils within the top 10 feet show good to excellant materials for per-
colation. If the impervious layer is broken this area could be extended to
indefinate depth.
These holes display specific conditions encountered at the specific location;
however, the sub-surface conditions are subject to minor change at each hole
location.
Based on the information obtained in these holes, it is felt that location for
septic tanks can be anywhere on,the lots and that percolation within any specific
septic locations should be excellant. The sand layer that prevails throughout
within the ~op 10 feet e~i.~ch hole Be-fn~ loose,should afford good septic leeching.
Buildings within the general area show that water in the form of wells is present.
Depth is unknown to this engineer but can be easily found through Department of
Heal th and ~3ci~r~.~horage, A1 aska offi
ce.
~..'"";"
N,~:.2.~.~..:.~ ,,~"'"~ ~ ~ -
James K. Dowling P.E.
DOWLING & ASSOCIATES
804 E. 15th Ave. Suite ~2
Anchorage, Alaska 99501
· ~ ' Ground ~Vater' Table
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,,~ .~ ~ .'~ .>.., ,,~ .',..~ .. , ......... .
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O~'Co~l~d" t~:' '~e~",/~l.~' DOWLING & AssoCIATES '" .'s~" '"~ ~ ..... o~ ".~'~'"
RIg'N~. ' ~ .... ~.~...],.. :.. ~ .. .~ ,.. ; . Engineers ~ Surveyors ' :.:,,.v.:.'.',.'Tol~/D~th~'..:~.. :' ../~ ~'~
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LOG OF lEST ~30HING
~l DOWLING & ASSOCIATES
Date"Co~pl~t~d
~1~ N~ ' .~ ,. Engineers -- Surveyors .
Projeot N~ ~. ~/~ ~nchorage~ . ~laska . , ,,..:.,.,...: ,,:....
'~ ~ ~ ~ ' ~ ~-~ ' ~ ~ ~ hiGr° und ~uter Tubl~
~o~o~ion ' e - ~ ' ' '
Method Used - -
· ~ Sheet" ' ~ ' of" "dl~ '
.?,.. Total Depth."'
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~ ~.. . ~ ~... .........
~ depths clr~ulollon Iost~ . ~. , ... . . ,.... : -~ .,. .... ~......,.........,....
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$89°5B'53,"E 1318.76 (R)(PLAT 79-201)
" S89°57'13," E 13,18.78 (M)
I I O'MA££EY. ROAD ·
'l S89 57 13 E,-'3,29.56 (""~
, _"~'~,, lO!UTILITY
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I' 299.68
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KLEMETSEN
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SUBD -"
~ 89°58'57"E ~
296.67(R) 297.08 (M) :4
N 89059' 04"W~.~.296~6~6 (R) (PLAT 79-2~
S 89°58' 3,6"E~ 297.3,1 (M)
LOT ::51 '
.--T-
LOT
1564-S /
198~
2t/~)' ALUMINUM CAP MONUMENT
0.2' ABOVE GROUND ON ::) I/2" x
30" ALUMINUM PIPE
TEMPORARY TURNAROUND
BE AUTOMATICALLY VACATEI:
WHEN ROAD $ EXTENDED \
S 89° 57' ~5 I
~,, 1564-$ / ~ /
2 I/2" ALUMINUM CAP MONUMENT
0.2' ABOVE GROUND ON 2 I/2" lc
30" ALUMINUM PIPE
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Test Hole Lo9- Description Guide
te soil descriptions shown on thc logs are the best estimate of the
~aractcristics at the time of field examination and as such do not achieve the
¢cision ,of a taboratory testing procedure. I~ the log includes soils samples.
use ~mples receive an independent textural classification in thc l~boratory
verify tJ~e field cxaminaimn.
~e logs ofien include rite following items:
Depth Interval - usually shown to 0,! foot, within that zone no
~[gnificant change'in soil type was observed through dHH action, direct
observation ur sampling.
Frost Classification - NFS, Fl, F2, F3, F4, see "Soil Classification
Cb,m"
Texture.f Soil .- An engineering classification of the soils by particle
size and proportion, see "Soil classification Chart", note thc
prop. rtim~s arc approximate and modifications to the soil group due tu
stratification, inclusions and changes in properties are htcluded.
dam.~, nmislure forms portion of color, less than plastic limit,
saturated, free water may be squeezed out, ifa free draining soil;
dilatcnt at natural moisture content, if.a non-ptastic silt or fine
·and. (The moisture content is further definedby reference to Pi,
LW, NP, M% or dilatency.)
Density - refers to ~nore-or-lcss non-cohesive soils, such as saddgrayel
mixtures with or without a fine fraction, derived from drilling action
and/or sample data; usually described&s: very loose, loose, medium
dense, very dense. General intent is to portsay earthwork
characteristics,
Stiffness - refers to more-or-less cohesive soils and fine grained silts of
~ clay-silt groups. Derived from drill action and/or sample data, Very
soft, soft, stiff, very stiff and hard ~,re commonly used lerms.
Particle size -. The largest particle recovered by the split spoon is
1-)/8", Shelby tube Y', auger flights [minute-man) 2", Auger flights
(P~50 hollow stem) 6"-8". Larger particles are described indirectly by
action of the drilliug and are referred to as cobbles, 3" to 8", or
boulders 8"+. Therefore wheu reviewing the gradation sheets, if any,
the description un the hole log must be considered for an'indication of
larger particles.
Unified Soil Classification - This is a two letter code. See Unified
Classification sheet fur further definition. In some cases AASHO and/or
FAA ~.oil classifications may be shown as well as the unified.
Atterberg Limits - u~eful for fine grained and other plastic soils.
Pi; natural moisture content believed to be less than plastic Limit
PB'i nattaal moL~ture ~:ontent believed to bc between plastic and liquid
l~mit s
L~+; natural moisture content believed to be greater than liquid limit
~IP; non-plastic, useful es · modifying description of some silty
saturated or nearly saturated soil sample when vJbrmtcd or jolted .- used
as an aid co dctcrlntne if a fine grained soil is · shghcJy ur non.plastic
aU[ or a volcanic ash,
Rock flour - finely ground soil that is nut plastic but otherwise appears
~ clayey silt.
Organic Content - usually described as Peat, PT, sometimes includes
discrete particles such as wood, coal, etc, as a modifier to .m inorgamc
soil. Quantity described as; trace, or an estimate of volume, or, i.n case
of all organic, - as Peat, This may include tundra, muskeg and
material,
Muck - a modifier used to describe very soft, semi-organic deposits
u~a Iy occuring below a peal deposit.
Amorphus peat ~. organic particles nearly or fully disintegrated,
Fibrous Peat - organic particles more-or-less intact.
Bottom of Tcsthole - includes last sample interval.
Frost Line - sea~nal frost depth as described by drilling action and/or
~amples at the time of drillmg.
Frozen Ground - other than frost i/ne, described by samples, usually
includes description of ice content, often will include modified Unified
Classification for fiozen soils - this is a special case related to
permafrost studies,
Free Water Level - The free water level noted duringdriHing. Thisis
not necessarily the static water table at thc time at' drilling or at other
seasons, Static water table determination in other than very permeable
soils requires observation wells or piezometer inst;dlations, used only
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 ~.2" advance is,
by definition, tLie standard penetration.
,,4%- natural moisture content of the soil sample, usually nnt
pe-'~'fr ormed ou Clean sands or gravels below the water table.
Type of Sample -- '
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,
C%"grab" disturbed sample from auger flights or walloftrench,
.~, cut sample, undisturbed sample from wall of trench.
Dry Stren[~th - a Useful indicator of a soil's clayey fraction, NgNone,
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 Atterbcrg Limits, grain s::te, moi~.cure4rnsuy
relationship, etc. may he performed on the group and are assumed to
reflect the general distrubed characteristics of the soils assigned to the
group. Thi:~ ~s an intportant phase of thy soft analysis and ~s used to
standardize thc various qualitative detcrminatmnt and co reduce the
number of quantitative tests necessary to describe tile ~ui] mass.
SOIL' CLASSIFICATION CHART
30% GRAVEL
SILTY
SAND
CLAY ,.~
\
CLAYEY
CLAYEY CLAYEY
CLAYEY
OR
St LTY SI LTY
GRAVELLY SAND
SANDY GRAVEL
SILTY
GRAVEL
:) GRAVELLY SAND GRAVEL GRAVEL
\ \ \
0 10 20 30 40 50 60 70 80 90 100
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 THANO.02 mm. AND SANDY SOILS
(EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN J5% FINER THAN 0.02 mm,
b. CLAYS WITH PLASTICITY INDEXES OF MOIRE 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 ]2.
d, VARVED CLAYS,
-~ ~, unicipality of Anchorage
DEPARTMENT OF HEALTH& ENVIRONMENTALPROTECTIQN
PRE.INSPECTION C.H,ECK SHEET
264-4720
4" CAST IRON SIPHON
' SEPTIC ~ PIPEWlTHAIRTIOHT ' ' or o9'
' LEVEL '5' CAST IRON INTO
, ,,._UNOISTURBEDSOIL l'' ;~;.?.100 'O
. , · ,M,N,MUMTOEO EOF 0 0
GRAVEL BACKFILL
CAST IRON REQUIRED WHENEVER LINE CRIB4'MINIMUMABOVEWATERTABLE
CRoSSESUNOER DRIVEWAY
MINIMUM WELL DISTANCES:
INDIVIDUAL
TO TANK 100' []
TO PIT 100' []
NO SEWER LINE 10'
PUBLIC ' Under 25
Service or Less
Than, 15 Connects
TO TANK 100' (
TO PIT 150'
75'-100' ONLY CAST
IRON SEWER LINE
PUBLIC -'over 25
Service or More
Than 15 Connects
TO TANK 200' ( )
TO PIT 200' ( )
100'-200' ONLY
CAST IRON SEWER
LINE
100°' NO SOURCE OF
CONTAMINATION
NOTE: 100'MINIMUM
FROM TANK AND PIT
RIVER, LAKE OR
STREAM ( )
Individual
4" SEWER LiNE []
CONSIDER DISTANCE TO AREA WELLS & sEWER SYSTEMS E3
PiT EXCAVATION BASED ON S01L TEST []
SEPTIC TANK MUNICIPALITY APPROVEO []
HOUSE
INLET & OUTLET MUST 5'
BE WATERTIGHT
SEPTIC!
'rANK
GRADE: 2' PER 100' OR
'/," PER FOOT EXCEPT lC
PRECEEDING TANK ANE
SIIOULO NOT EXCEED 2'
6" PER 100' ON FL~
TERRAINS []
SEEPAGE
PIT
SEEPAGE PiT
CRIB
SCREENED GRAVEL
%"- 2%"
20' MINIMUM TO NEAREST LOT LINE