HomeMy WebLinkAbout1978 Percolation Test Report%
RBPORT ON PERCOLATION TESTING
POR
STIBLOH'S ADDITION
OROtK), MINNBSOTA
Prepared By
Bugene A. Bickok a Associates
Naysata, Minnesota
Hay, 1978
I
t
I
I
I
I
■
i
I
■
i
!
I
I
I
I
I
i
X. Introduction and Sunmary
W« have coBpleted a prograa of percolation testing
for the proposed Stielow addition. The legal description
of this parcel of land ist Lots 1» 2, 3, 4, Sr 6r and
7r Auditor's Subdivision Number 207, Bennepin County,
Minnesota.
All work was performed in accordance with the
requirements of the City of Orono, Hennepin County and
the State of Minnesota.
The proposed lots with the exception of lots 1, 4,
9 and 11 were found to have soil conditions suitable for
on-site sewage disposal systems.
XI. Scope of the Testing Program
The scope of this testing program is Intended to
fulfill the City's requirements for subdivision plat
approval. It will also result in percolation tests
sufficient for building permit application and the
design of individual on-site sewage disposal systems.
Testing was performed in accordance with the applicable
City ordinance and the requirements of Hennepin County
and the State of Minnesota.
A soils report and map were prepared by Bennepin
Soil and Mater Conservation District and is included
herein as Appendix A. we began our work by studying
this report to determine the location of the soils
«
b
mi
i
b .
b
b
•ost suitable for on-site sewage disposal systems. He
also studied the proposed plat and topographic map to
determine how the locations of the hones, wells, and
drainfields would best be located on each lot. These
proposed locations are shown on Figure 1 and are considered
preliminary. At the time that building permits for each
particular lot are applied for, final locations of these
site features will be set; of course, the drainfields
must be constructed on the locations tested unless another
test is made.
Our field work included drilling six percolation
test holes and three soil borings for each lot. All of
the percolation test holes were six inches in diameter
and three feet deep. Each of the soil borings were eight
feet deep. As each hole was drilled, a record was made
of' the soils encountered. All of the soils information
which we developed was added to that of Hennepin Soil
and Hater Conservation District and a revised soils maps
was prepared for the site. The depth co the water table
was recorded when encountered. Percolation tests were
porformed in accordance with HPC 40 of the State of
Minnesota.
The details and results of the test are discussed
for each lot separately below.
0^
H
Lot Nine
The soils on lot nine include Hanel Loan, Lester
Loaa» and Lester Clay Loam. The first is not suitable
for drainfields} the Lester soils are. Our testing
encountered Lester Loam soil. The average percolation rate
for the primary drainfield site was 59 minutes/inch
and 50 minutes/inch for the secondary site. The water
table was encountered at a depth of from 2.5 to 4 feet.
The percolation rate for each test hole is listed in Table 1.
The soil boring logs are listed in Table 2. This lot
is being retested to find another location suitable for IHpini
m
a drainfield.
Lot Ten
The soils on lot ten include Hanel Loam and Lester
Loan. The .first is not suitable for drainfields} the Lester
soil is. Our testing encountered the Lester Loan and
Hamel Loam soils. The average percolation rate for
the primary drainfield site was 8.7 minutes/inch
and 14 minutes/inch for the secondary site. The
water table was encountered at a depth of three
and five feet in two soil borings but not encountered to
eight feet in the third boring. The percolation rate
for each test hole is listed in Table 1. The soil
broing logs are listed in Table 2.
l:Overview oe Results
All of the lots except lots 1, 4, 9, and 11 had soil
and site conditons which are suitable for on-site conditions
which are suitable for on-site sewage disposal. The tests
were located at what we consider to be the best sites for
the construction of the drainfields. This is not to say
thAt other sites are not suitable. It is recognised
that as hones are built on the lots, other sites nay be
desireable for various reasons. This report can be used as
a guide in evaluating other sites on each lot, of course
another percolation test would be required if another site
were proposed.
Stated percolation rates are averaged for the location
shown, and no guarantee is implied or expressed that these
conditions exist for the entire area.
%
■■
f
Table Z cent.
TB8T
HOLB MATERIAL PERCOLATIOK
LOT 9
9-1 Lester Loam 19.2 min/in
9-2 Lester Loam 250.0 min/in
9-3 Lester Loam 250.0 min/in
9-4 Lester Loam 125.0 min/in
9-5 Lester Loam 31.3 min/in
9-6 Lester Loam 125.0 min/in
LOT 10
10-7 Lester Loam 4.0 min/in
10-8 Lester Loam 41.0 min/in
10-9 Lester Loam 83.3 min/in
10-10 Lester Loam 125.0 min/in
10-11 Lester Loam 6.0 min/in
10-12 Hamel Loam 27.7 min/in
Lot 11
11-1 Lester Loam 50.0 min/in
11-2 Lester Loam 250.0 min/in
11-3 Lester Loam 83.3 min/in
11-4 Lester Loam No Percolation
11-5 Hamel Loam 83.3 min/in
11-6 Lester Loam 3.6 min/in
Lot 12 mis
12-1 ^Lester Loam 13.2 min/in
12-2 Lester Loam 3.5 min/in
12-3 Lester Loam 19.2 min/in
12-4 Lester Loam 15.6 min/in
12-5 Lester Loam 62.5 min/in
12-6 Lester Loam 20.8 min/in
Lot 13
13-1 Lester Loam 62.5 min/in
13-2 Lester Loam 19.2 min/in
13-3 Lester Loam 125.0 min/in
13-4 Lester Loam 125.0 min/in
13-5 Lester Loam 63.3 min/in
13-6 Lester Loam 25.0 min/in
I
Soil Boring Table cont.
SOIL
BORING
9C (conto)
lOA
I
IOC !
N?
DEPTH
5.0-8.0*
Water table 3 4:^
MATERIALS
Light olive brown silty clay
loam Bottled with rust and gray
clay
low surface
0-0.8*
0.8-6.0*
6.0-8.0*
Black silty loan
Olive brown silty clay loan.
Bottled with rust, with soBe sand
Olive brown silty clay loaB,
Bottled with rust and gray clay
Water table was not encounteied within 8*
of the surface.
0-1.0*
1.0- 3.0*
3.0- 8.0*
Water tab
0-0.8*
0.8-4.5*
4.5-5.5*
i
Black silty loan
Very dark grayish brown silty
clay laoB
Olive brown silty clay loaB,
Bottled with^JMiot and gray
clay below(^0^
low surface
Black Silty loaB
5.5-8.0*
Water tabi(3
Olive brown silty clay loan.
Bottled wipi nwA and gray
clay belofcJ^U
Olive brown sandy clay loan, nottl
with rust and gray clay
Brownish gray silty clay loan
ow surface