HomeMy WebLinkAbout1992-11-05 Septic System Design ReportC�i22CNOMM
SYSTEM DESIGN
FOR JENSEN HOMES
OF LOT 3, BLOCK 1, HANSER ADDITION
ORONO, MINNESOTA
11-5-92
'Nov a 1M
System design information follows for a proposed house on the above
lot. This will be a pressure mound system with construction and
materials following the provisions of the City of Oronj and the
Minnesota Pollution Control Agency.
Both the primary and alternate septic system areas will be staked
out and all construction traffic must be apt off of both sites.
In addition to the septic tanks proposed, p—tping tank of 1250
gallons is needed. All runoff must be divertea from the mound
system.
If any other information is needed, please contact me.
Sincerely,
PERCOR, INC.
IL ��i•t 1� �! 1�
Mark S. Gronberq
TENIF•✓ WO.'" FJ
[ o r -7., Block, � /O/iI N-ftex AOI /Tian/
%**-� ) /
/ .i
��rtcw�rf / 11 Ct M 1
it sort
qe
E'' r`y � 2 O N 0
CITY Q
BUILD1N::r r" iV REVIEW
i = _
-i0
/�- A;�rRC�,'r,:. • ,�,�•,s�,_;'_�.:.T�C1,! � AS NOTED
YC,; r• All work ^hall Cc done
-onin„ core r••
o.�rf ; //- f-9L rw:cd ties rev,e4L
....
JYAcf i KNEE' TH►5 t=;,,� SLT OU SITE AT ALL TIMES
60
F-15
PUMP 5
A. Determine pump capacity:
I. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of
water ise 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.
3.1 Use value from design of pressure distribute n s stem.
SELECTED PUMP CAPACITY gpm
B. Determine head requirements:
1: Elevation difference between pump and point of discharge..
T { feet
2. If pumping to a pressure distribution system, add five feet for pressure
required at manifold
S feet
3. Friction loss
a. Enter friction loss table with gpm and pipe diameter.
Read friction loss in feet per 100 feet from page F-18.
F.L. _ Ir. 2IL ft./100 ft of pipe
b. Determine total pipe length from rump to discharge
paint. Add 25 percent to pipe length for fitting
loss, or use a fitting loss chart. Equivalent pipe
length -1.25 times pipe length =
/O 0 x 1.25 - /2S feet f
C. Calculate total friction loss by multiplying
friction loss in ft/100 ft by equivalent 1 e 1
Total friction loss =2.&3+frx /11 +100: ALES S feet
4. Total head required is the sum of elevation difference,
3�
special head requirements, and total friction lo5�.
+ s 3'
(><) (2) # 7 c)
TOTAL HEAD feet +
C. Pump selection
1. A pump must be selected to delivtir at least S7, >gpm (Step A) with at least
14.5 feet of total head (Step B).
D. Total Pumpout Volume
1. To maximize pump life scllxt sump size for 4 to 5 pump operations per day.
.900 gpd + 4 = 125 gallons per dose
2. Calculate drainback
1. Determine total pipe length, /00 feet.
2. Determine liquid volume of pipe, /?- y3gallons per 100 feet. (see page F-18)
3. Multiply length by volume: Drainback quantity =
tO0 feet x /7.YJgallons/100 ft. _ /7. ygallons.
Suggested drainback quantity is 10 percent of pumped quantity. A larger drainback
percentage will decrease pump station efficiency slightly but.pumping energy costs are
usually a relatively small pan of the total household anargy costs.
3. Total pump out volume equals dose volume + drainback
2 2 5 gallons per dose + /7. Y gallons - .2 V2. Y Total Gallons
pipe Length
t
Point of TTDisch.
Elevation Diffcrcncel Pump
F-18b
1.5 inch .0 inch 3.0 inch
SPM rytaim tmFPWIMIrorope
10
0.69
0.20
12
0.96
0.28
14
1.28
0.38
16
1.63
0.48
18
2.03
0.60
20
2.47
0.73
0.II
25
3.73
1.11
0.16
30
5.23
1.55
0.23
35
7.90
0.30
40
I LC7
0.39
45
14.73
3
0.48
50
.99
0.58
55
4.76
0.70
60
5.60
0.82
1
_3.0
•,WAGQ FLOWS IN GALLON: PER pay
TyrE 0I REs1nENCE 4 --
1 13 1>Z rz
300
225
160
cox
430
300
210
of
4"
373
256
1o1i�
730
900
450
525
294
332
Tj;
1050
600
370
01
e
1200
675
406
columns
100
1.25
7.77
115
14.58
2
17.43
2.5
24.87
3
38.4
i - 4
66.1
MOUND DESIGN WORKSHEET
(For Flows up to 1200 gpd)
A. FLOW
Estimated 73"0 gpd (seepages D-7 or I-3, 4, 5)
or measured gpd. arc 900 C-po
B'.SEPTIC TANK LIQUID VOLUMES
/1 So A /D 00 gallons (see pages C-3 or C-5)
/ZJ.9 ir,4ti v PNMIivG f, Aht
C.' SO11S (refer to site evaluation)
1. Depth to restricting layer = 2,2 inches
2. Depth of percolation tests = /6 inches
3. Percolation rate _ 13.7 mpi
4. Land slope I %
D. ROCK LAYER DIMENSIONS
I. Multiply flow rate by 0.83 to obtain required area of rock
layer: A x 0.83 =
0 D gpd x 0.83 sq. ft./gpd = 7S0 sq. ft, .
2. Select width of rock layer (10 feet or less) _ /0 ft.
3. Length of rock layer = area + width =
75-41 sq. ft. + 10 ft. = 7- . Oft.
E. ROCK VOLUME
1. Multiply rock area by rock depth to get cubic feet of rock;
7So sq. ft. x / ft. = 7So cu, ft.
2. Divide cu. ft. by 27 cue ft. /cu. yd. to get cubic yards;
7SO cu. ft. + 27 =.27.78 cu. yd.
3. Multiply cubic yards by 1.4 to get weight -of rock in tons;
27.78 cu. yd. x 1.4 ton/cu. yd. =3� tons.
r. AUbUX. FTION WIDTH
1. Percolation rate in top 12 inches of soil is /is 7 mpi
2. Select allowable soil loading rate from table on page E-16;
afE o.60. gpd/ft2
3. Calculate adsorption width ratio by dividing rock layer
loading rate of 1.20 gpd/ft2 by allowable.soil loading rate;
1.20 gpd/ft2+0. 60 gpd/ft2 = 2 . o O
Check this value on page E-16.
4. Multiply adsorption width ratio by rock layer width to get
required adsorption width;
2, go x / 0 ft = 20. Oft
E-19
D-7
C-3
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E-16
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E-20
13. DOWNSLOPE DIKE WIDTH
1. If landslope is 3% or more, subtract rock layer width from
�- adsorption width to obtain minimum downslope dike toe
20.0 ft - /0 ft = /a, o ft
2. Calculate mound height at edge of rock layer on downslope
side;
a. Determine depth of clean sand fill at upslope edge of rock
layer: Separation /. 2 feet
b. Multiply rock layer width by landslope to determine drop
in elevation; Slope Difference
c. Add depth of clean sand depth of clean sand for
separation at downslope edge to depth of rock layer to
depth of soil backfill to get mound height at downslope
edge of rock layer;
/, 2 ,ft + /, o ft + /. o ft+ V. Y ft = 3, a ft
d. Enter table on page E-18 with landslope and downslope
dike ratio. Select dike multiplier of S! 76
e. Multiply dike -multiplier by downslope mound_height
to get downslope dike width: Y. 76 x j?. 6 =. /7. / ft
g. Compare the values of step G.1 and Step G.2.f. Select the
greater of the two values as the downslope dike width;
17,1 feet
h. Calculate upslope dike width using upslope mound
height and upslope dike multiplier from page E-18;
2 x 3, S = //.oft
i. Total mound width is the sum of upslope dike width plus
rock layer width plus downslope dike width;
//. G ft + /o ft + /7. / ft = 39. / ft
13. If landslope is 2.9 percent or less, basal width includes both the
upslope and downslope dike widths.
a. Calculate downslope dike width using steps G.2..a.
through G.21, feet
b. Calculate upslope dike width using upslope mound
height and dike multiplier from Page E-18;
x ft - ft
C. Add downslope dike width to upslope dike width to rock
layer width
ft + ft + ft. = ft
.TOPSOM..I
fLO►•t tee I MOCK "Urrt!
Nark layer width (d21
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Oodtutd W d Ike width (.
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E-26
1. Select number of perforated laterals 6
2. Select perforation spacing = ___j- ft.
3. Since perforations should not be placed closer than 1 ft. to
the edge of the rock layer (see p. E-14), subtract 2 ft. from the
rock layer length.
75
Rock layer length_,? f t. ', Z = 36. S 6- rya
4. Determine the number of spaces between perforations.
Divide the length above by perforation spacing and round
down to nearest whole number.
Length perf. spacing =36. S ft. + 3 ft. _ /Z spaces
(3) (2)
5. Number of perforations is equal to one plus the number of
perforation spaces.
spaces + 1 =1 ? perforations/lateral
6. Multiply perforations per lateral by number of laterals to
get total number of perforations.
/.3 Q
laterals x perf./lateral= 78 perforations.
I Determine required flow rate by multiplying
number of perforations by flow per perforation
(see page E -17)
78_y
Pais x apm/perf - gpm•
8. If laterals are connected to header pipe as shown on page E-
15, select minimum required lateral diameter from table oft
page E-17, enter table with perforation spacing and number
of perforations per lateral. Select minimum diameter for
perforated lateral = inches.
9. If perforated lateral system is attached to manifold pipe near
the center, as on page E-12, perforated lateral length and
number of perforations per lateral will be approximately one
half of that in step 8. Using these values, select minimum
diameter for perforated lateral from page E-17 as
inches.
E-17a
Head
Perforation diameter (inches)
o,
O
1a
1.5
0.90
2.Ob
0.90 1.04
2.5
0.89 1.17
3.0
0.98 1.29
'4.0
1.13 1.47
5.0 1.2(
aUse 1.0 foot of head for residential systems.
bUse 2.0 feet of head for other establishments
E-17b
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1.5 inch
2.0 inch
2
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18
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3.3
13
12
17
4.0
5.o
11
10
16
15
14
23
22
E-15
E-12
w-.asrsae M v- -
• U-39
PERCOLATION TEST DATA SHEET
7.
Test hole location t — Hole number
�-' Date test hole was prepared y — / y — j f Depth of hole bottom, inches.
Diameter of hole,_ inches.
--Soil data from test hole:_
Depth, inches . Soil texture
o -/Y _ ✓3LA-o-4M
Method of scratching sidewall
Depth of pea -sized gravel in bottom of hole,
_ Z inches.
Date and hour of initial water filling 91"/9— 9/ P /
Depth of initial water filling, 16, inches above hole bottom.
Method used to maintain at least 12 inches of water'de_pttC.in_hole for.at least
6 hours_ f / L
Percolation test readings made by L2 /V G ,e G / on'
startinga.m.
at ,� O'>7 Maxi:aum water depth above hula buttu
(date)
during test, / inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
-rater •.
minutes per
inch
Remarks
uL
L
Percolation rate . 9, ?_ 3 minutes per inch....
V - - e-/ P - /
B-39
PERCOLATION TEST DATA SHEET ....._._..
Test hole location yA/1/.S F/t' '—� D T L� Bole number
�-' Date test hole was prepared y / :Z—__9/ Depth of hole bottom, _L� inch,ts.
Diameter of hole, 6 inches.
Soil data from test holey
Depth, inches Soil texture
Method of scratching sidewall
Depth of pea -sized gravel in bottom of hole, Z inches.
Date and hour of initial water filling 9 / 9 — 9/ 4� /Y
Depth of initial water filling, / G inches above hole bottom.
Method used to maintain at least 12 inches of water depth"in hole for *at least
4 hours
Percolation test readings made by &A.1 L1,—,ToA/OERG- on
—20 — y/ starting at _?_ �- a_m. . Maximum water . epth above hole buC
(date)
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Perr.,:! .:,.ion
rate,
minutes per
inch
Remarks
a
L
iL
12.0-0
o'a
�-c�,.
,
_._.
Ff,i- l-
ii
0
,, ,,
i210
Percolation rate - 2 0
Zar y P--Z
minutes per inch.
' PERCOLATION TEST DATA SHEET 8-39
Test hole location --L p T� L� — Hole number 3
�-' Date test hole was preparedf q — 9� Depth of hole bottom,, inches.
--Diameter of hole, �_ inches.
Soil data from test hole:_
Depth, inches Soil texture
- 0-9
Method of scratching sidewall . c RAT < A GR
Depth of pea -sized gravel in bottom of hole, 1pinches.
--
Date and hour of initial water filling
Depth of initial water filling, inches abake.hole.bottom.
Method used to maintain at least 12 inches of water depth"'in hole _or at least,
4 hours[ L
Percolation test readings made by DoAl Gn oN Rc_ on
9-.701 5�/ starting at a.m. . Maximum water depth above hole boLLL
(date) s
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
asinutes per
inch
Remarks
/ 30
L
,3
6
_
7
►. a I
/7
.0
Is of
A i
Percolation rate - %- minutes per inch.
PERCOLATION TEST DATA SIIEET
Test hole location /i/i/s-OR T— {{ole number
Date test hole was prepared 9 - / q - GJ / Depth of hole bottom, inches.
Diameter of hole, �_ inches.
Soil data from test hole:
Depth, inches Soil texture
L,
Method of scratching sidewall
Depth of pea -sized gravel in bottom of liole, inches. .T
Date and hour of initial water filling
Depth of initial water filling, 14 inches above dole bottom.
Method used to maintain at least 12 inches of water depth'•in.hole for 'at least
4 hours L
Percolation test readings made by 00& 6 /x-o V,6E,eG on
-20- 9/ startinb at g a.m.
.� m. Maximum water depth above tivla i>uc.tu
(date) is"
during test, / �� inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,.
c,inutes per
inch
Remarks
30
12,
,,
..:._.........
_ _� LL
O P iN
S Vo
,�
6
„ _
So
�� 1
_EE
Percolation rate 2r� %-j minutes per inch.
� Q r 9,, /- y
Lor,,n OF Soil borillf's tf-18
LocaCiOn .or 1'rofeet
Borinps madc by / 0
classification System: AAS110 US1?�-SCS UniLic.d ; ; other
;. Auger uncd (check. turo) : t!and or Poster Flight _, or Bucket ; othu'.
T--___ -- ----- -----•
Depth, Boring nu:rher• �Dr.pth, 13oring number 21
In Surface elevation in
!ear. feetSurface elevation------•
.n
,BK L o.rM
1 — DoRk 13R
SR, e_•< <o.4,-7 ��TF�Ro�.ti cL�y Lo��y
Got LiTFI3R►CL
End of boring at 3. S feet.
Standin.g stater table:
i,•escnt at 2, 7 feet of depth,
hours after borinp.
Vot present in boring hole
Mottlad soil:
Observed at fact of depth.
Clot rr.escnt In boring. hole _
Observations and comuants:
5 —
6 —
1 —
II—
land of bori•r•c at —3— feet. I
Standing aster -Cable.'..
present at feet: of deptii,
hours after horins_. i
Not prevent •'in borin,s!.-hole.
i
Mottled coil: I
ohcarvad at 47 fact of depth.
tlot prarant In boring hole
Ohsc_'vation! :aid couunont�:
B-39
PERCOLATION TEST DATA SHEET
Test hole location 16171s4fp �
T- i Hole number_
Date test hole was prepared 9 -.
T_� � / Depth of hole bc,tton;�_ inches.
Diameter of hole, _ 6 inches.
Soil data from test hole:
Depth, inches Soil texture
9C /o'lM
Method of scratching sidewall .SCeA/C
Depth of pea -sized gravel in bottom of hole,
2 inches.
Date and hour of initial wz :er filling 9-/s- - 9/ d-, _W P,/I.
Depth of initial water filling, (0 inches above hole bottom.
Method used to maintain at least 12 inches of water depth•in hole for at least
4 hours
Percolation test readings made by 0,0,9
9-/9- 9/ starting at 2-V a.m.
�— -.m.
(date)
during test, 3411 inches.
on
Maximum water depth above hole bottoi:
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
iL
/!
ri
AS-
z
i� i
9
_
it
,, , ,
p
. p
2!
Percolation rate = _/0_ minutes per inch.
or ' P-S
- B-39
PERCOLATION TEST DATA SHEET
Test hole location _'H/fIV5 E/ —L� �- — Hole number
Date test hole was prepared 9 / r-
q / Depth of hole bottom,_ inches.
Diameter of hole, __. b inches.
Soil data from test hole: -
Depth, inches Soil texture
Method of scratching sidewall SC^97C RR
Depth of pea -sized gravel in bottom of hole, inches. '
Date and hour of initial water filling
Depth of 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 /i L- Fi L L
Percolation test readings made by aeoy lr ,e OP✓
%/ starting at f Z 2Z a.m. .
(date) `—�:B en-
during test, // ��/ inches.
.R G.
on
Maximum water depth above hole botLOI
Tim
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
�2
IF2
12
Percolation rate = 1 minutes per inch.
Low. of Soil Borinp.s 11-1II
.a -�-_-. - _
Location .or Pro Inct—__-.--
Borinps made by
classification System: AASHO USDA-SCS X Unified other_ -
Auger used (check: two) : F?and or Power _; Flight or Bucket Y-1: other
Depth, Boring nticrher' —J- Dr-pth, Boring numher
'in Surface elevation ' feet in Surface elevation
.0 r--T-
1 —
_.
3 —
4 —
5 —
6 —
7 —
. 8—
,QL/9cK 4 o .4 M
13P L o �► M
po7T «o BR. e- L.rX-
End of boring at _3 feet.
Standing wacer table:
i'l-esent at feet of depth,
hours after boring.
Not•present in boring hole �_•
r '•
Mottled soil:
Observed at �- feet of depth.
t:ot present in bocinp. hole — —
Obsurvations and co=ients:
o,aRlt 'BR. L' o AM'
a� < <.4 y L o •Y '41
n o7r.L a 0 ER, c l pry L o11
4 —
5 --
6 —
7
8 —
End of boring at —Z-
Standinp- water table:
Present at fee
hours aft
Not present 1n borins
.lottled soil:
'Ibsorved at /. feet of dopth. .
Clot present in boring hole
Observations and COIT-ents:
Lois of Soil Borim-.p
T.oclrio:l or Pro Inct ,
Borings made by Date
classification system: AAS110 USDA-!;(;;; Ut, if I .-(I (Ithe'.
Aurcr used (check two): Itand ,*K
or Flj*jjj*C or BuCkCL
Dcptjj, Boring numhcr*_._3______ nriltiii norifist amoier
in fact Surface elevation fact in Surface elevation
R L
L. 7-r-
3
4 4
6
.7
Fnd of boring ac rec-c.
Scand-4-7 wntcr cable:
r-resenc at 3,1 feet of dri)th,
hours after boring.
t.'oc.prcscnt in boring hole
Mottled Soil
Observed at fact Of
I!ot prcscnt in boring, hole
ObsQtvatlons and comments'
1:11d of borillf. ac
,IL fact of: -LIC1,010
hours after borinn.
loc pru!;cnt In borimst hale
�,.Otticd -coil:
n1luarved at foot ne
t1ot 1)rQUaltt in boring hole
0b!;c%-,.j;,tjo%it;.nnd COUIX.100CU: