HomeMy WebLinkAbout1989-10-03 Septic System Design ReportU}4--1eAz>
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S-P TESTING, INC.
951 KATYDID LANE
ST. MICHAEL, MN 55376
497-3566
Steven B. Schirmers
October 3, 1989
Paul Bayke
Lot 1, Block 1 F. 1/2
Lauranne Woods
Orono, Henn. Co., MN
This system is Designed for a Type 1, four bedroom home and in accordance
with the Minnesota Pollution Control Agency Chapter 7080 and local
ordinances.
The soils on this site are typical of SCS soils mapped - HID - Hayden
Complex. A seasonally high water table was located at 46" & 4811,
(mottled soil). A shallow trench system may be installed (future
expansion area) 12" deep with a minimum of 12" of loam cover over
the rock. The soil surface between the trench must be turned over
typical of a mound system.
The soils at a depth of 12" have a percolation rate averaging 7.9
min/inch and are adequate for treating septic effluent.
A pumping chamber will need to be installed to lift the effluent to the
treatment area.
The 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 supply line pipe must have back
drainage to the pumping chamber.
The present syst�-m is functioning properly at this time. Testing was
copmleted for the future expansion area for the existing house. The
existing system is a shallow trench system 12" deep with 2-1000 gallon
tanks.
All neighboring wells are located more than 100' away from the proposed
treatment area & 75' 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 should be
marked off before construction.
CONT'D
Soil and Percolation Testa
Septic System Design
With proper installation and maintenance, this system should have no
problem in treating septic effluent effectively.
Recommend to pump the septic tank every year if there is only 1 tank
& every 2 years if there are 2 tanks.
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INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEET
FLOW
A.
Estimated gpd
measured - — x 1.5 ■ - •-- go
SEPTIC TANK VOLUME
B.
— ) !fU 1 — 16': (- gallons
SOILS (Site evaluation data)
C.
Depth to restricting layer = ' �' o' • n feet
D.
Maximum depth of system C - 3 ft = J feet
E.
Percolation rate 7 MPl
F.
Soil Sizing Factor • 1 , sq ft/gpd (See table 3) '
TRENCH BOTTOM AREA
H.
For trenches with 6 inches of rock below the pipe:
A x F ■ x ■ _ eq ft of bottom area
1.
For trenches with 12 inches of rock below the pipe:
A x F x 0.8 ■ J x /.?^ x 0.8 = 2" sq ft of bottom are*-+
�.
For trenches with 18 inches of rock below the pipe:
AxFx0.66= x x0.66■_sgftofbottom area
K.
For trenches with 24 inches of rock below the pipe:
AxFx0.6= x x0.6=_sgftofbottom area
DIED BOTTOM AREA
L.
For seepage beds with 6 or 12 inches of rock below the pipe;
1.5xAxF■15x_x_=_sgftofbotiomarea
ROCK VOLUME IN CU FT
M.
Rock depth below distribution pipe plus 0.5 foot times bottom area:
M =Rock depth (ft) + 6 inches x Area (H, 1, J, L or K)
(L_ ft + 05 It) x 2 �= IJ + J cu ft
ROCK VOLUME IN CU YDS
N.
Volume in cu ft divided by 27
M + 27 = cu yds_,+ 27 = ' j L cu yds
ROCK WEIGHT
O.
Cubic yards times 1.4 = tons
Nx1Aatons IJ-_,,x1.4=tons
DISTRIBUTION
(Check one based on slope)
—
Bed (less than 6% slope)
Trenches
Drop boxes (any slope)
Distribution box (level to slightly sloping)
TRENCH LENGTH
P.
Select trench width = ', ft
Q.
Divide bottom area by trench width: (H, I, ), or K) + P =
lineal feet
: a L. lineal feet
LAWN AREA
R.
Select trench spacing, center to center = ;' feet
S.
Multiply trench spacing by lineal feet R x Q = sq ft of lawn area
LAYOUT (Use other side)
1. Select an appropriate scale; one square = feet.
2. Show pertinent property boundaries, right-of-way, casements.
3. Show location of house, garage, driveway, and all other
improvements, existing or pnlptlscd
4. Show location 4nd layout of sewage trealment system.
5. Show location of water supply well.
b. Dinwnslon all wl backs attJ w1itirdNun dislmtcY-4.
E00n w sewap ((w oallmm par day
Of wumbir
Bedroom
Type l
Type
Type
Tir
2
300
223
110
3
4
450
6W
300
375
218
2%
w
6
900
323
332w�
7
1030
600
370
0
12M
675
41X
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IN 'R M �
2 w Is" 790 3w4 low4 w 6 1700 7. f w 9 2000 orw 9
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A. Determine pump capacity:
Gravity Distribution
1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of
water use rate.
2. Maximum suggested for delivery to a drop box of a home system is 2,700
gallons per hour (45 gpm) to prevent build-up of pressure in drop box.
Pressure Distribution
3. a. Select number of perforated laterals -
b. Select perforation spacing - --- ft.
c. Subtract 2 ft. from the rock layer length.
so up WW -2ft. = ft.
d. Determine the number of spaces between perforations.
Length perf. spacing i. ft. t__ ft-= --- @paces
e. spaces a 1 = . perforations/I. teral
f. Multiply perforations per lateral by number of laterals to
get total number of perforations.
t .. . x Fw = perforations.
g, -;= xIPW?PW . gpm.
SELECTED PUMP CAPACITY L" gpm 1' ) 4A-
S. Determine head requirements:
I. Elevation difference between pump and point of discharge.
_(` feet
2. If pumping to a pressure distribution system, add five feet for pressure
required at manifold
- feet
3. Friction loss
a. Enter friction loss table with gpm and pipe diameter.
Read friction less in feet per 100 feet from table.
F.L. a d ft./100 ft of pipe
b. Determine total pipe length from pump to discharge
point. Add 25 percent to pipe length for fitting
loss, or use a fitting loss chart. Equivalent pipe
length -1.25 times pipe length •
x 1.25 - feet
c. Calculate total frictiot lose by multiplying
friction loss in ft/100 ft by equivalent pipe length.
Total friction loss x •100 • feet
4. Total had required is the sum of clevation difference,
special head requirements, and total fnction loss.
ll) (2) + (3c)
TOTAL HEAD feet
C. Pump selection
1. A pump must be selected to deliver at least
with at least feet of total head (Step B).
so PW WArtetl a A 10- w aTf1. 1AIOIM.
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arts 1.0 hat d hnd hr wdrarlt rl�a
(bust 2.0 hltdlutl ograttisraslrMrtianar
gpm (Step A)
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10
0.69
0.20
12
0.96
0.28
14
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0.38
16
1.63
0.48
11
2.03
0.60
20
2.47
0.73
all
25
3.73
1.11
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30
3.23
1.33
0.23
35
7.90
2.06
0.30
43
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14.73
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Ss
4.76
0.70
60
3.60
0.82
L-13 i
CERTIFICATI 00627 :.ogs of Soil Borings
Location or ject Paul Beyke, Lot 1, block 1, Lauranne Woods, Orono
Borings made by S-P Testing, Inc. Steve Schirmers Date 9-28-89
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 87.8 feet Surface elevation 87.8
0 - 0 -
Topsoil dark brown Topsoil dark brown sandy
sandy loam 1 0 - 10" loam
1 0 - 1'4"
Brown sandy loam
1'4" - 1110"
2
Brown loam
3 _ 1'10" - 3'
Brown clay loam
4 _ 4'-MOTTLING
31 - 4 ' 2 "
Rusty olive brown
5 - I loam
6 - 1 412" - 6'
7 -
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 4' feet of depth.
Not present in hole
Comments:
Brown sandy loam
2
10" - 2'8"
3 Brown loam
4 - 2'8" - 4'-MOTTLI
Rusty olive brown
1-
5 -
C -
7 -
End of boring at 6' feet.
Standina water table:
present at feet of depth,
hours after boring.
Not present in hole X
Mottled so-l:
Observed at 4' feet of depth.
Not present in hole
Comments:
L-13
CERTIFICATION #t 00627 Logs of Soil Borings
Location or Project Paul Beyke, Lotl, Block 1, Lauranne Woods, Orono
Borings made by S-P Testing, Inc. Steve Schirmers _ Date 9-28-89
Classifiction System: AASI-10 USDA-SCS X Unified Other
Auger used (check two): Hand X , or Power F14-ht , or Bucket X
Depth,
Boring number 3
Depth,
Boring number
in
86.7
in
feet
Surface elevation
feet
Surface elevation
0 -
0 -
Topsoil dark brown
sandy loam
1 -
0 - 1'2"
1 -
Dark gray brown
sandy loam"
2 _
2 -
1 2 - 2 2
y
Gray 2'2" - 218" br?wwRmsan
Brown loam
3
3
2'8" - 3'10"-MOTTLING
Rusty olive brown
loam
3'10" - 4'10"
5 -
5 -
Rusty olive gray clay
4'10" - 5-1/2' loam
Rusty olive gray loam
6 -
5-1/2' - 6'
6 -
7 -
7 -
8 -
8 -
End of boring at 6' feet.
Standing water table:
present at feet of depth,
hours -after bor 4 ^g .
Not present in hole X
Mottled soil:
Observed at 3'10"feet of depth.
Not present in hole
Comments:
::nd of boring at feet.
Standing water table:
present at feet of ,'7 pth,
hours after boric
%,ot present in hole
Mottled soil:
Observe9 at feet of depth.
Not present in hole
Comments:
I
CERT.#00627
PERC^'.AT'OV TEST DATA SHEET
Percolation test readings made by S—P Testing, Inc _ on 9-29-89 starting at 9 - n 9
Test hole location Lot 1, B 1 k . 1, Lau ranne Woo 1
, Date hole was Prepared 9-28-89
Depth of hole bottom.- 12 inches, Diameter of hole 6 inches
Soil data from test hole
Depth, inches
Soil textu-c
0 — 12" Topsoil dark brown sandy loam
Method of scratching sidewall Kn i f e
2
Depth of gravel in bottom of hole inches p
Date and hour of initial water filling 9-28-89 , OPMR1 9Finitial water filling 12 inches above hole bottom
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automtie siphon
Maximum water depth above hole bottom during test 6 riches.
Time
Time
interval.
minutes
Measurement, I
inches
Percolation
Drop in water rate. I Rcmarks
level, inches minutes per
inch
1:52
prefill 1
6
i
1:02
9:32 I
2-7/16 ; 12.3
30 min
1:37'
10:07 "
w i w IN w
A 10
10:40
1
i
Percolation: .,: - 12.3 minutes per inch.
K
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I .- CERT.#00627
PERCOLATION TEST -,�.k, TA --'rlr,,T
S—P Testing, Inc. 9-29-89 9:03 '
Pcrcolatic test readings made by on darting ar p.m. !
Text hole!c+cation Lot1,B1k.1,Lauranne woo pno 2 9-28-89
, 461c'nu r , Date hole was prepared
Depth of hole bottom 12 inches, Diameter of hole 6 inches
Soil data from test hole:
Depth, inches Soil xxture
0 - 10" Topsoil dark brown sandy loam
10" - 12" Brown sandy loam
Method of scratching sidewall 'Knife
Depth of gravel in bottom of hole 2 inches
Date and hour of initial water ! Ming 9 — 2 8 —19 9 • pat4 12
g , D�pih o initial water filling inches above hole bottom
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon
Maximum water ee^th above We bottom during test 6 inches
i Time I i ?ercolation '
Time i interval, j Measurement, Drop in water rate, i Remarks
minutes I inches lev._1, inches minu!c-z ner
8:52 prefill 6
9:03 9:18 " I 3-7/16 4.4 15 min
9:20 9:35 I " 3-1/4 4.6 w w
9:36 9:51 I " 3-3/16 4.7 I w w
I I ,
I
a
I
I I
Percolation rate = 4.6 R+inutes per inch.