HomeMy WebLinkAbout1976-05-18 Septic System Design ReportMcCOMBS-KNUTSON ASSOCIATES, INC.
CONSULTING ENGINEERS ■ LAND SURVEYORS ■ SITE PLANNERS
Mr. Allan Olson
Building Inspector
City of Orono
P. 0. Box 66
Crystal Bay, MN
Subject;
55323
Proposed On-Site Sewage Treatment System
Lots 6 & 7, Swan Lake Addition
Dear Al;
We have reviewed the percolation tests and the design
of the on-site sewage treatment system for the subject property
as prepared by Soil and Materials Engineers. The site in
question is suitable for construction of an on-site disposal
system and we would therefore recommend the granting of a permit
to construct a system.
Mr. Overtoon, the design engineer for the project, has
proposed 250 linear feet of drain tile in a 36 inch trench
based on an average perc. rate indicated that the average rate
review of the average perc. rate indicated that the average rate
for design of the system should be 50 minutes per inch for the
proposed three bedroom house utilizing a 36 inch trench; 310
linear feet of drain tile would therefore be required. Drain
tile shall be overfilled with four inches of filter media
material placed over the drain tile as oj>posed to the two
inches specified by the design engineer."
If you have any question or comments, please do not
hesitate to contact us.
Sincerely,
Richard W. Sathre
RWS:slw
12805 OLSON MEMORIAL HIGHWAY, MINNEAPOLIS. MINNESOTA 55441 TELEPHONE (612) 559-3700
36 NORTH MAIN STREET. HUTCHINSON, MINNESOTA 55350 TELEPHONE (612) 879-8029
SOUTHWEST ENGINEERING DIVISION, MARSHALL, MINNESOTA 56258 TELEPHONE (507) 532-5820
k.
L
Van Eeckhout Building Corporation
May 18, 1976
Page two
The provisions of the "Ordinance and Code Regulating Individual Sev/age
Disposal Systems" (1971), as recommended by the Minnesota Department of Health,
as well as any local ordinances and codes, should be followed In the design and
Installation of the disposal system.
If there are any questions with regard to this report, please do not
hesitate to contact us.
Yours very truly,
SOIL & MATERIALS ENGINEERS, INC.
James H. Overtoom
Registered Professional Engineer, Minnesota
JH0:cg
Attachments
cc: City of Orono
Attention: A1 Olson, Building Inspector
Swanson, City Engineer
-Ev
SOIL a MATERIALS ENGINEERS,INC. .
REVISIONS PERd.Ot.AT 1 OAJ TEST LO<LATIO a J /5/A6PAM
NO.OATE ■V 10 JZ b < 1 ,iJ'uock:. SwA.v;t,/vkE.
1 A C C \ T 1 0 A J .6ROAO . I^IWNEioTA
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a DRAWN BY
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DRAWING MO.
a TRACKO ARR-O !J
GENERAL NOTES
1950 Chicago Building Code Soil Classifications aro Usod Except Whero Notod
DRILLING & SAMPLING SYMBOLS
I Split-Spoon— 1 */$** I. Dm 2” O. D., oxcopt whoro notod
I Sholby Tubo-2" O.D., oxcopt whero nctoJ
I Power Auger Sample
I Diamond Bit-NXi BX: AXi
I Carboloy Bit — NXi BXi AX>
I Osterberg Sampler —3" Shaiby Tube
t Houtel Sampler
WS t Wash Sample
FT I Fish Tail
RB I Rock Bit
WOi Wash Out
SS
ST
PA
DB
CB
OS
HS
Standard *’N'* Penetratiem Blows per foot of a 140 pound hammer failing 30 inches
on a 2 inch OD split spoon« e xcept where noted.
WATER LEVEL MEASUREMENT SYMBOLS
WL I Water Level
WCII Wet Cave In
DCI t Dry Cave In
WS t While Sampling
WD I While Drilling
BCR I Before Casing Removal
ACR I After Casing Removal
AB I After Boring
Water levels indicated on the boring logs are the levels measured in the boring at the times
indicated. In pervious soils, the indicated elevations are considered reliable ground water
levels. In impervious soils, the accurate determination of ground water elevations is not
possible in even several days observation, and additional evidence on ground water eleva
tions must be sought.
CLASSIFICATION
COHESIONLESS SOILS COHESIVE SOILS
"Troce"
"Trace to some'
"Some"
"And"
Loose
Medium Dense
Dense
Very Dense
1% to 10%
10% to 20%
20V»to35%
35% to 50%
0 to 9 Blows
10 to 29 Blows
30 to 59 Blows
> 60 Blows
equivolent
If clay content is sufficient so that clay dominates
soil properties, then cloy becomes the principle
noun with the other major soil constituent as
modifier; i.e.. silty clay. Other minor soil con
stituents may be added according to clossifica-
tion breakdown for cohesionless soils; Le.. silty
clay, trace to some sand, trace gravel.
Soft
Stiff
Tough
Very tough
Hard
0.00 — 0.59 tons/ft-
0.60 0.99 tons/ft-
1.00 — 1.99 tons/ft-
2.00 — 3.99 tons/ft=
> 4.00 tons/ft>
SOIL 6 MATERIALS ENGINEERS
INC.
7900 77th Avenue North
Minneapolis, Minnesota
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210 m l 99.9 b
Ar 4 kot --%lcrd- i LL b--
oP
D I hereby certi'y that this plan
specification, or report wa preparcd
by me or under m; d; ect
and that I am a &Iav
neer under tha ,
e`
Minnes RP " 0..,.
NA-
UNIFIED BOIL CLASSIFICATION SYSTEM
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Group
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Typicoi namos LaPoratory dasHication eritaria
Wail-pradad gravals. gravel-sand
mixtures, little or no finas
Poorly graded gravels, gravel-
sand mixtures, little or no fines
Silty gravels, gravel-sand-silt
mixtures
Clayey gravels, gravel-sand-clay
mixtures
Well-graded sands, gravelly
sands, little or no fines
SM
Poorly graded sands, gravelly
sands, little or no fines
Silty sands, sand-silt mixtures
aayey sands, sand-day mix
tures
ifUL
SI!l|S
Hill?
Cu*^—greater than 4; Cc'*o,qXO60 **®*'"'**" ' ^
Not meeting all gradation requirements for GW
Atterberg limits below "A"
line or P.l. less than 4 Above “A" line with P.l.
between 4 and 7 are bor-
derlin* cases requiring use
of dual symbolsAtterberg limits above "A"
line with P.l. greater than 7
Dm
‘“'o.o ''■o.oXOm
Not meeting all gradation requiremerii'- lor SW
Atterberg limits below "A"
line or P.l. less than 4 Limits plotting in hatched
zone with P.l. between 4
and 7 are bordtrline cases
requirirtg use of dual synv
bols.Atterberg limiu above "A"
line with P.l. greater than 7
5 fe
ll
fl
“■?
o
C2
S
ll
11 1
S
I
H«I
I?
I
ill
Inorganic silts and very fine
sands, rock flour, silty or clay
ey fine sands or clayey tilts
with slight plasticity
60
Inorganic clays of low to me
dium plasticity, gravelly clays,
sandy clays, silty clays, lean
clays
Organic silts and organic silty
clays of low plasticity
MH
Inorganic silts, micaceous or
diatomaceous fine sandy or
silty soils, elastic silts
Inorganic clays of high plas
ticity, fat clays
-I----+----1
— For clasification of fme-grained
__soils and fine fraction of coarse-
__grained soils.
— Atterbarg Limits plotting In-
— hatched area are borderline dassi-
“flcations requiring use of dual
__symbols.
Equation of A-line: -
-------PI=0.73(LL-20)
Organic clays of medium to
high plasticity, organic silts
CL-MI
i'i'
MLaidOL
X
.OH and MH
Peat and other highly organic
•oils
b 10 20 30 40 50 60 70 80
Liquid Limit
Plasticity Chart
100
McCOMBS-KNUTSON ASSOCIATES, INC.
CONSULTING ENGINEERS LAND SURVEYORS ■ SITE PLANNERS
Mr. Allaui Olson
Building Inspector
City of Orono
P. O. Box 66
Crystal Bay, MN 55323
Subject:Proposed On-Site Sewage Treatment System
Lots 6 & 7, Swan Lake Addition
Dear Al;
We have reviewed the percolation tests and the design
of the on-site sewage treatment system for the subject propertv
as prepared by Soil and Materials Engineers. The site in
question is suitable for construction of an on-site disposal
to^construct^ would therefore recommend the granting of a permit
design engineer for the project, has
proposed 250 linear feet of drain tile in a 36 inch trench
based on an average perc. rate indicated that the average rate
review of the average perc. rate indicated that the average rate
for design of the system should be 50 minutes per inch for the
proposed three bedroom house utilizing a 36 inch trench; 310
linear feet of drain tile would therefore be required. Drain
tile shall be overfilled with four inches of filter media
material placed over the drain tile as opposed to the two
inches specified by the design engineer.
If you have any question or comments, please do not
hesitate to contact us.
Sincerely,
Richard W. Sathre
RWS:slw
12805 OLSON MEMORIAL HIGHWAY, MINNEAPOLIS. MINNESOTA 55441 TELEPHONE (612) 559-3700
36 NORTH MAIN STREET, HUTCHINSON, MINNESOTA 55350 TELEPHONE (612) 879-8029
SOUTHWEST ENGINEERING DIVISION, MARSHALL. MINNESOTA 56258 TELEPHONE (507) 532-5820
CITY OF ORONO
• P. O. BCX 66
CRYSTAL BAY, MINNESOTA 55323
BUILDING JOB REPORT
ADDRESS - --�- -- ----- --
OWNER
CONTRACTOR_- _
DATE_ PERMIT NO
DESCRIPTION__
INSPECTION RECORD
I
REP.
DATE- _ INSPECTION
SOIL & MATERIALS ENGINEERS, INC
Van Eeckhout Building Corporation
1055 East Wayzata Boulevard
Wayzata, Minnesota 55391
Attention: Mr. Jerry Finnamore
Soil Percolation Test for Proposed Residence at Lots 6 and 7» Block 2,
Swanlake Addition, Orono, Minnesota
Gentlemen:
We were retained by you to perform soil percolation tests at the above
property (see Drawing No. 1 attached). The tests were performed on May 18,
1976. The procedure was in accordance with the methods designated by the
Minnesota Department of Health, 1971, and somewhat modified by our engineering
Judgment.
The attached log sheets indicate the observed percolation rates at each of
the test holes (P-1 through P-6). The observed percolation rates at each of
the test holes was within the maximum allowable rate of 60 minutes per inch,
as recommended by the Minnesota Department of Health. Based on these observa
tions, the installation of an individual soil absorption system will be accept
able in the areas tested.
In addition to the above percolation test holes, one test boring was drilled
to a depth of 15.0 feet below the existing ground surface to determine if the
water table Is less than that depth. According to the readings listed on the
attached log sheets, it is our opinion that the level of the groundwater table
was below that depth at the time of the Investigation.
Fluctuations in the water level may occur over a wide range, depending
upon the amount of precipitation, evaporation and surface runoff which will vary
with seasonal changes.
Based on the test results, installation of an individual soil absorption
disposal system should be acceptable for a recommended design rate of 30 minutes
per inch ii the vicinity of P-4 through P-6; or a rate of 60 minutes per inch In
the vicinity of P-1 through P-3* The observed water table In the area is at a
depth greater than 6 1/2 feet below the existing ground surface, making an
absorption system acceptable according to State Code regulations.
SOIL & MATERIALS ENGINEERS. INC ■ 7900 77TH AVENUE NORTH.MINNEAPOLIS.MINNESOTA 55445 ■ (612) 425-6478
DARRELL F. SCHNEIDER PE
MICHAEL L. LARSON PE
JAMES H.OVERTOOM P.E.
KEITH P. CASWELL JR PE
JOHN P. GNAEDINGER PE.
CLYDE N.BAKER JR PE,
Affiliate of
STS CONSULTANTS.LTD.
consulting ENGINEERS DIVERSIFIED INC.