HomeMy WebLinkAbout1987-11-04 Septic System Design ReportS-P TESTING, INC.
951 KATYDID LANE
ST. MICHAEL, MN 56376
4074M
STEVE SHIRMERS
November 4, 1987
Dave Woodword
888 Dakota Ave.
Orono, Henn. Co., MN
This sy----em is designed for a Type 1, four bedroom home and in accordance
with the Minnesota Pollution Control Agency standards WPC 40 and local
ordinances.
The soils on this site are typical of -EAB - Erin loam but are SCS soils
mapped - HbC - Hayden loam. This site has an existing failing system due
to strong clay soils -and a high seasonally high water table located at 18"
to 24", (mottling). Space available for installing a new septic system is
limited, to design a new system to meet state & city codes is not possible.
The soils at a depth of'18" have a percolation rate averaging 46.2 min/inch
and are adequate for treating septic effluent.
One method to treat septic effluent would be to install holding tanks, (2 -
1000 gallon capacity) with a warning device indicating when it is time to
pump the tanks. The other method would be to install a shallow bed system
18" deep in the higher ground located in the southeast property corner.
With the average percolation rate of 46.2 min/inch, recommend to over ex-
cavate to a depth of 24" & replace with a clean sand (coarse washed sand)
The rock will need a minimum of 6" of cover. A pumping chamber will need
to be installed to lift the effluent to the treatment area. Recommend to
pressurize this system typical of a mound system using 1-1/2" dia. distri-
bution pipe with 1/4" perforation W" apart. Also recommend a holding tank
be installed to catch overflow from the system if the system has seepage
occuring during the wet seasons,. spring & fall. U<<n- tAfs U se';' 61-it, S tiSrrvu.
p5 AAJ ove-e_FLOw ?)
Tt.e power supply and switches must be located outside the manhole and
pumping chamber in a weather proof enclosure. A warning device must be
installed with a light and sound device, this is'in case of a pump failure.
(Mercury floats are a good method)..
The existing tank may be'used upon approval by the local inspector.
All neighboring wells are located more than 75' away from the proposed
treatment area and 50' away on this site.
Keep all heavy equipment off of the proposed treatment area before and
after construction as much as possible. The treatment area Lhould be
marked off before construction.
With proper installation and maintenance, this system should have no
Self and Perrolstbw Testa ( CONT' D )
Septic System Ihmign
problem in treating septic effluent effectively.
it is recommended that the septic tanks be pumped every 2 years.
This design was discussed with the inspector and will need to be approved
by local officials.
' la.,
, 3"C�z -
Steven B. Schirmers
SBS/ds
L-13
CERTIFICATION t 00627 Logs of Soil Borings
Location or Project 888 Dakota Ave., Orono
Borings made by S-P Testing, In,-. Steve Schirmers Date 10-14-87
Classifiction System: AASHO USDA-SCS X Unified Other
Auger used (check two): Hand X or Power Flight , or Bucket X
Depth, Boring number 1 Depth, Boring number 2
in in
feet Surface elevation 102.6 feet Surface elevation 103.1
0 -
Topsoil dark gray loam
0 - 10"
1 _
Dark gray brown loam
10" - 1-1/2'-mottling
Gray brown clay loam
1-1/2' - 2'2"
2 -
Rusty olive brown loam
3 -
2'2" - 318"
Rusty olive brown loam to
3'8" - 4' sandy loam
4 -
Rusty olive brown loam
5 -
4' - 5-1/2'
Gray 5-1/2' - 5'8"silty to m
6
Rusty 5'8" - 6' oliYgaMrow
-
7 -
8 -
End of boring at 6 feet.
Standing water table:
present at feet of depth,
hours after boring.
Not present in hole X
Mottled soil:
Observed at-1-1/2' feet )f depth.
Not present in hole
Comments:
Topsoil dark gray loam
0 - 10"
1 - Dark gray brown loam
10" - 1'4"
Brown clay loam
2 - 1'10"-mottling
114" - 214"
Rusty gray brown strong loa
3 - 2t4" - 3'2"
Rusty olive brown loam
3'2" - 3'10"
5 -
M
7 -
8 -
Rusty olive brown
ivam to sandy loam
3'10" - 6'
End o,' -sting at 6 feet.
Standing water table:
present at feet of depth,
hours after boring.
Not present in hole X
Mottled soil:
Observed at 1'10" feet of depth.
Not present in hole
Comments:
L-13
CERTIFICATION # O0627 Loas of Soil Sorings
I:
Location or Project 888 Dakota Ave., Orono
Borings made by S-P Testing, Inc. Steve Schirmers Date 10-14-87
Classifiction System: AASHO USDA-SCS X Unified ; Other
Auger used (check two): Hand X , or Power , Flight , or Bucket X
Depth,
in
feet
0 -
Boring number 3
102.7
Surface elevation
Depth,
in
feet
0 -
Boring number
Surface elevation
— -
2'-mottling
2 _
2 _
3 -
3 -
SAME AS BORING #2
4 -
4 -
5 -
5 -
6 -
6 -
7 -
7 -
8 -
8 -
End of boring at 6 feet:
Standing water table:
present at feet of depth,
hours -after boring.
Not present in hole X
Mottled soil:
Observed at 2
feet cf 'depth.
Not present in hole
Comments:
End of boring at feet.
Standing water table:
present at feet of depth,
hours after boring.
Not present in hole
Mottled soil:
Observed at feet of depth.
Not present in hole _
Comments:
I
�iZil�f� �il;.� r �•Y� 7Tl ��;1�1
S—P Testing, Inc. 10-14-87 9 : 0 0 - ':m:
Percolation test readings made by 9 on�"rting at
Iw,J
Test hole location 8 8 8 Dakota Ave., Orono , Hole number 1 , Date hole was prepay 10-13-87
Depth of hole bottom 18 inches, Diameter of hole 6 inches
Soil data from test hole:
Depth, inches Soil texture
0 — 10"
10" — 18"
Topsoil dark gray loam
Dark gray brown loam
Method of scratching sidewall ' Knife
Depth of gravel in bottom of hole 2 inches
10-14-87 1.30p.m. 12
'ate and hour of initial water filling . Depth of initial water filling inches above hole bottom
Method used to maintain at least 12 inches of watt, de-:h in hole for at least 4 Automatic siphon
V
Maximum water depth above hole bottom during test ° inches
Time
Time
interval,
minutes
Measurement,
inches
Drop in water
k .cl,inches
Percolation
rate,
minutes per
inch
Remarks
Rater remaining
in test
hole
9 : 0 0
9 : 3 0
6
7 16
68.6
30 min
9:35
10:05
10:06
10:36
"
Percolation rate - 6 8 . 6 minutes per inch.
L'
I:
■.
PERCOLATION TEST DATA SHEET
S—F Testing, Inc. 10-15-87 9:0 a.m.
Percolation test readings made by on starting at p. M.
Tea hok location 8 8 8 Dakota Ave., Orono, Hole numbs 2 , Date hole was pm 10-14-8 7
18 6
Depth of hole bottom inches, Diameter of hole inches
Soil data from test hole:
Depth, inches
Soil texture
0 — 10" Topsoil dark gray loam
10" — 16" Dark gray brown loam
16" — 18" Brown clay loam
Method of scratching sidewal
Depth of gravel in bottom of hole 2 inches
10-14-87 1:30p.m. 12
Date and hour of initial water filling , Depth oT initial water filling inches above hole bottom
Method used to maintain at kart 12 inches of water depth in hok for at least 4 hours Automatic siphon
, Maximum water depth above hole bottom during test 6 inches
Time
Time
interval,
minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
Water rem
ii.ing in t
st hole
9:01
9:31
6
112
60.0
30 m'
9:34
10:04
"
10:07
10:37
Percolation rate - 60.0 minutes per inch.
-• -.
1:
PERCOLATION TEST DATA SHEET
S—P Testing, Inc. „�, 10-15-87 �,�,; g 9:02 a:m:
Percolation test readings made by g n at
888 Dakota Ave., Orono 3 10-14-87
Test hok location , Hole number , Date hole was prcnatr*t
Depth of hole both 18 inches, Diameter of hole 6 inches
Soil data from test hole:
Depth, inches Soil texture
0 - 10" Topsoil dark gray loam
10" - 16" Dark -gray loam
16" - 18" Brown clay loam
Method of scratching sidewall
Knife
2
Depth of gravel in bottom of hok inches
10-14-87 1:30p.m. 12
Date and hour of initial water filling _Depth of initial water filling inches above hole bottom
Method used to maintain at kart 12 inches of water depth in hole for at last 4 hcx►nc Automatic s iphJn
--- ------ Maximum water depth above hole bottom during test 6 inches
Time
--- Time
j interval,
minutes
Measuremer.:,
inches
Drop in water
Level, inches
Percolation
rate.
minutes per
inch
Remarks
8:50
prefill
6
9 : 0 2
9 : 3 2
3
10.0
30 min
9:33
10:03
2-15/16
10.2
"
10:08
10:38
Percolation rate — 10.1 R+inutes per inch.
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TEE TO TEE LATERAL —MANIFOLD CONSTRUCTION
Topsoi I
Loamy Sand Backfill
�C 4
Tee ` �4
C u
Grass Cover
Hay or Straw Covered
by Layer of Red Rosin
Paper (or nylon fabric)
Perforation in Cap Near
Crown of Pipe
Perforations at Lateral
Invert
Rock. -Layer
1: 12
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