HomeMy WebLinkAbout1978 Percolation Test Reportm
REPORT ON PERCOLATION TESTING
FOR
STIELOW'S ADDITION
ORONO, MINNESOTA
Prepared By
Eugene A. Hickok & Associates
Wavz^a
/^Hay, 1978 J
I. Introduction and Summary
We have completed a program of percolation testing
for the proposed Stielow addition. The legal description
of this parcel of land is: Lots 1, 2, 3, 4, 5, 6, and
If Auditor's Subdivision Number 207, Hennepin County,
Minnesota.
All work was performed in accordance with the
requirements of the City of Orono, Hennepin County and
the State of Minnesota. _ _ _ _ _ _ _
ir - - - - - - - - - - ' ~ " "■
The proposed lots with the exception of lots 1,
9 and 11 were found to have soil conditions suitable
on-site sewage disposal systems
II. 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 Hennepin
Soil and Water Conservation District and is included
herein as Appendix A. We began our work by studying
this report to determine the location of the soils
■
most suitable for on-site sewage disposal systems. He
also studied the proposed plat and topographic map to
determine how the locations of the homes, 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 to the water table
was recorded when encountered. Percolation tests were
performed in accordance with WPG 40 of the State of
Minnesota.
The details and results of the test are discussed
for each lot separately below.
I
i
Lot Eleven
The soils on lot eleven include Hamel Loam and Lester
Loam. The first is not suitable for drainfields; the Lester
soil is. Our testing encountered the Lester and Hamel
Loam soils. The average percolation rate for the pri
mary drainfield site was 111 minutes/inch and 6.8 minutes/
inch for the secondary site.- The water table was
encountered at a depth of from 2.5 to 3.5 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 locatioii suitable for a
drainfield._ _ _ _ __
Lot Twelve
The soils on lot twelve include Hamel Loam, Glencoe
Silty Clay Loam and Lester Loam. The first two are not
suitable for drainfields; the Lester soil is. Our testing
encountered Lester Loam soil. The average percolation
rate for the primary drainfield site was 8.3 minutes/inch
and 9,9 minutes/inch for the secondary site. The water
table was encountered at a depth of four feet in one boring
and not encountered to a depth of eight feet in two
other borings.
IV. Overview of Results
s
k
II
All of the lots except lots 1, 4, 9, soil
and site conditons which ace 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 recognized
that as homes are built on the lots, other sites may 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.
Table I cont.
TB8T
HOLB
LOT 9
9-1
9-2
9-3
9-4
9-5
9-6
LOT 10
MATERIAL
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Hamel Loam
Lester Loam
Lester Loam
Lester Loam
Lester Loam
Hamel Loam
Lester Loam
PERCOLATION RATE
19.2 min/in
250.0 min/in
250.0 min/in
125.0 min/in
31.3 min/in
125.0 min/in
4.0 min/in
41.0 min/in
83.3 min/in
125.0 min/in
6.0 min/in
27.7 min/in
50.0 min/in
250.0 min/in
83.3 min/in
No Percolation
83.3 min/in
3.6 min/in
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 83*3 min/in
13-6 Lester Loam 25.0 min/in
Soil Boring Table cont.
12B
Olive brown silty clay loamr
mottled with rust below 2.0*,
with some gravel
Water table 2.S' below surface
0-1.0* Black silty loam
1.0-8.0*Olive brown silty clay loam,
mottled with rust and gray
clay below 2.5'
Water table 3.5* below surface
0-0.5*
0.5-4.5*
4.5-8.0*
Black silty loam
Olive brown silty clay loam
mottled with rust and gray
clay below 3.0*
Light olive brown silty clay
loam, with some sand, mottled
with rust and gray clay
Water table was not encountered within 8*
of the surface
0-0.5*
0.5-1.0*
1.0- 4.O'
4.0- 8.O'
Black silty loam
Grayish brown silty clay loam
Olive brown silty clay loam
Light olive brown silty clay
loam, with some sand, mottled
with rust
Hater table was not encountered within 8*
of the surface.