HomeMy WebLinkAbout1976-05-10 Septic System Design Reporti
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COMBS-KNUTSON ASSOCIATES, INC.
CONSULTING ENGINEERS ■ LAND SURVEYORS ■ SITE PLANNERS
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May 10, 1976 J U S-1 Du
MAY 141
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Mr. Henry Muhich, Zoning Administrator
City of Orono i(ILLAGB Obi ORONO
P.O. Box 66
Crystal Bay, Minnesota 55323
Subject: Proposed On -site sewage Treatment System
Mr. James Hanson, Dakota Avenue
Dear Hank:
We have reviewed the design information relevent to the
subject treatment system, prepared by E. A. Hickok and
Associates, and would recommend your approval of the permit
to construct the system, but with the following reservations.
The distribution box should not be fitted with caps as
specified to rest half the system, due to the unlikelihood
that the caps would be rotated annually. The septic system
and drain field may be constructed as a gravity system, with
no dosing chamber if elevations allow. The Building In-
spector should inspect the site prior to final location of
the well site and should assure himself that the well is
located at least 75 feet from all drain fields.
It would appear that the best site for a well would be to
the south of the proposed house in the area of the alternate
drain field. We would recommend that the well may be placed
here if it is so proposed, but with the stipulation that
should the primary drain field fail, a replacement system
will have to be constructed at the primary site following
excavation and refilling of the primary drain field area;
since it appears that no other suitable areas exist on the
home site.
Please call if you have any questions or comments.
Sincerely,
McCOMB`S-KNUTSON S OCIATES, INC.
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Richard W. Sathre
RWS/cs
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
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p�e�on�DAUG 4 1976
VILLAGE CE ORONO
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SOIL TESTING SERVICES OF MINNESOTA. INC.
2405 ANNAPOLIS LANE SUITE 280
MINNEAPOLIS, MINNESOTA 55441 612-559-1900
August 2, 1976
Mr. James Hanson
616 East Park Street
Wayzata, Minnesota 55391 Ct884
Re: Compaction Test for Residence to 8e Located Dakota Avenue in
Orono, Minnesota.
STS Job No. 90739-A
Dear Sir:
On July 30, 1976, Mr. Philip S. Stoffey of Soil Testing Services of Minnesota
went to the above referenced site and performed 5 cone penetrometer tests in the
southeast corner of the excavation (see location sketch). Approximately 4 feet
of medium to coarse sand mixed with traces of fine to coarse gravel had been placed
in that area, The results of these tests are included in this report. The Con-
tractor, who placed the fill, used a vibratory roller with a 30-inch drum to
compact the s.-,d. Lifts were placed,at approximately 9-inch intervals.
The cone penetrometer is a penetration device used in granular soils. A
30-inch rod with a cone -shaped tip is driven into granular soils by dropping a
10-pound weight 30 inches and recording the number of blows required to penetrate
1 foot. The cone penetrometer has been calibrated in various soils with other
compaction -measuring devices.
For the type of soil used at this location, at least 30 blows for 12 inches
would indicate compaction to approximately 95% of the maximum Modified Proctor dry
density (ASTM D-1557-70). After an initial seating of 6 inches which is necessary
William C. Kwasny,P.E. CHICAGO. PEORIA, ILLINOIS • WASHINGTON, D.C. • ORLANDO, FLORIDA • CEDAR a EnginaoringAnalvsis;Reports
John P. Gnaadingar, P.E. RAPIDS•IOWA CITY, DAVENPORT, DES MOINES, IOWA • WICHITA, KANSAS a SAY • Construction Ouality Control
Clyde N. Baker, P.E. - CITY, DETROIT, GRAND RAPIDS, MAROUETTE, MICHIGAN 0 MINNEAPOLI , 9 Foundation Borings and Tasting
Mr. James Hanson
August 2, 1976
Page two
due to disturbance of the unconfined surface soil by equipment, --the cone was
driven to a depth of approximately 18 inches below the existing grade. It was
observed that with depth the soil became increasingly dense, and the blow counts
varied between 32 and 54 inches for one foot of penetration. However, in location
5, the rod was driven an additional 6 inches to a depth of 24 inches below the
existing grade and the penetration from 18 to 24 inches was 20 blows. Therefore,
from the results of these tests, it is our opinion that the compaction meets the
requirement. However, we recommend that additional testing be performed as fill
is placed to final grade.
If there are any questions with regard to this report, please do not hesitate
to contact us.
Very truly yours,
SOIL TESTING SERVICES OF MINNESOTA, INC.
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Philip S. Stoffey /
Senior Engineering Geologist
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ames H. Overtoom
Registered Professional Engineer, Minnesota
Enclosure
i HEREBY CERT!FY THAT THIS PLAN, SPECIFICATION,
cc: Mr. Al Olson OR P.EFOky, WAS PREPARED BY ME OR UNDER MY
DIRECT SUPERVISION AND THAT 1 AM A DULY
PSS/WCK: 1 h REc7iSTE,:ED PP,OFESSIONAL ENGINcER UNDER THE
LJ,'.Vs OF THE STATE OF MINDESOTA.
DATED, ZiG REG.
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NOT TO SCALE - LOCATIONS ARF APPROXIMATF
BORING LOCATION SKETCH SOIL TESTING SERVICES
JAMES HANSOM PROPERTY OF MINNESOTA, INC.MINNEAPOLIS, MINNESOTA
ORONO, MINNESOTA Pss
7-30-76 O ; -A
STS Job No. 90739-A
TEST RESULTS
Depth Below
Test Number Ground Surface Total Blows
1 6" - 18" 32
2 6" - 18" 54
3 6" - 14" 40 Refusal at 14"
(probable boulder)
4 6" - 18" 48
5 6" - 181, 42
loll - 24" 20