HomeMy WebLinkAbout1980-06-16 Septic System Design ReportTO: Jeanne Mabusth, Zoning Administrator
FROM: Michael Gaffron, On -Site Systems Manager
DATE: June 16, 1980
SUBJECT: #551 SUBDIVISION - John L. Brooks, 795 North Ferndale Road
The site evaluation report for the Brooks application has been submitted
and reviewed. Soils were found to be suitable for a standard drainfield
system. 'My boring on the site verified the soil types indicated in the
report. The lot with the existing home has ample area for future
drainfield should it ever become necessary. I would recommend approval
of the subdivision. If all of Orono had soils such as found on this
site, we would have few septic system problems throughout the City.
SITE EVe�LUATICN REPORT
JOHN L. BROOKS PROPERTY
795 N. FERNDALF HOAR, ORONO
6-lo-bo
1
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On Junes 8, 1980 one proposed lot was tested for the suithbility
of supportinv a drainfield system. Six percolation holes were tested
and 3 soil borings taken on the proposed lot. Percolation holes were
dug b inches in diameter to a 42 inch depth while the soil borings
were dug 6 inches in diameter to a 4 foot depth and 3 inches in dia-
meter to the remaining depth. The percolation holes were dug by both
hand and power augers while the soil borings were dug by bucket type
hand augers.
This proposed lot is located in the Hayden Loam soil series which
is generally moderately permeable. The primary site yieldod a fairly
fast percolation rate of 13.0 minutes per inch and the water table is
deep enough to meet the requirements for a standard drainfield system.
Holes 5 and 6 were closer to the drainge swale on the property leading
to the lake and contained more clay soils. This resulted in a slower
percolation rate and the water table was higher. A shallow trench sys-
tem should be used if ever needed on this alternate site and the trenc-
hes should be kept from holes 5-6 as touch as possible.
Additional design information will be needed once the size and
location of a proposed house are known. It would be possible to locate
the alternate site up the hill more in better soil depending on where
the house is located. Please contact me at that time, or if i
questions come up.
Sincerely,
PERC OR , INC.
Mark S . Gront
JOHN L.
i 795 N.
ORONO,
BROOKS PROPERTY
FERNDALE ROAD
MINNESOTA
Percolation Results
Hole No.
Material
Percolation Rate
P-1
Brn. Sandy
Clay Loam
17.1 Min./inch
P-2
Brn. Sandy
Clay Loam
9.2
P-3
Brn. Sa,:dy
Clay Loam
11.4
p-4
Brn. Sandy
Clay Loam
14.1
P-5
Brown Clay
Loam
40.0
P-6
Brown Clay
Loam
40.0
The average percolation rate for holes 1-4(primary site) is 13.0 Min./inch.
Soil Borings
S. B.#.1
Depth(ft.) Material
0.0-0.4 Black Loam
0.4-1.0 Brn. Sandy Loam, small rocks
1.0-3.0 Br.-. Sandy Clay Loam
3.0-8.0 Gray Brown Loam
Mottled soil at 6.9 feet and water 'table at
7.3 feet after 24 hours.
S.B.# 3
Depth(ft.) Material
0.0-0.6 Black Loam
0.6-1.7 Gray Brown Loam
1.7-4.0 Brown Clay Loam
4.0-6.0 Gray Brown Clay Loam
Mottled soil at 3.8 feet and water table
at 3.8 feet after 21� hours.
S.B.# 2
Depth(ft.) Material
0.0-1.0
Dk.
Brn. San.Lm.
1.0-4.0
Brn.
San. Cl. Lm
4.0-,4.6
Brn.
Sandy Loam
4.6-6.0
Brown
Lo; m
6.0-7.5
Fine
Loamy Sand
7.5-8.0
Gray
Fine Lmy.Sa
No mottled soil and no water
table after 24 hours.
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QATE : 6-/0-80
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