HomeMy WebLinkAbout1994-06-14 Septic System Design ReportSystem Design
for DON WILSON
of Lot 2, Block 2, SHADOWOOD FARM
Orono, Minnesota
6-14-94
The following information concerns the design of a pressure
mound system for a possible 4 bedroom house on the above de-
scribed property. All construction and mateials must conform
to the standards of the City of Orono and MPCA Chapter 7080.
All construction traffic must be kept off both the primary
and alternate drainfield areas. These areas should be marked
off prior to construction.
A pumping tank will be needed to house the pump which is nec-
essary for pressure distribution to the system. The supply
lines must be constructed to drain back to the pumping tank.
A weather proof enclosure will also be needed to house the
controls and switches for the pump. Also, a warning light/
sound system will be needed to warn of pump failure.
If any other information is needed, please contact me.
IP Sincerely,
PE,RCCiOR, INC.
Mark S. Gronberg
L 3 - ���yl
l7
�Ilw a�e
/ /31X, 12
MOUND DESIGN WORKSHEET
(For Flows up to 1200 gpd)
A. FLOW
Estimated 6'00 gpd
or measured x 1.5 = gpd.
B. SEPTIC TANK LIQUID VOLUMES
12-5-0 gallons f- /000 6W 4 0A" Z N0 riX.O&
t /2?o G,/i.tor✓ NMI.,04 re",r.
C. SOILS (refer to site evaluation)
1. 'Depth to restricting layer = Z 8 inches
2 Depth of percolation tests = y inches
3. Percolation rate 9_ D mpi
4. Land slope -5 %
Estimated SeonCc
Nm
&b
af�
Type i
Bedroom
2
300
3
430
4
5W6
1-$
7900
6
ova 9
7
1050
I
1200
NAW
h4-
&b
C.A-
rte
ea
4�
2 or im
75
3 ar 4
1.0
5W6
1-$
Tor a
zo
ova 9
Sem 64
D. ROCK LAYER DMIENSIONS
1. Multiply flow rate by 0.83 to obtain required area of rock
layer: A x 0.83 -
6oU gpd x 0.83 sq. ft./gpd = Soo sq. ft.
2. Select width of rock layer (10 feet or less) _ /0 ft.
3. Length of rock layer = area + width = Rock Bed
50,0 sq. ft. + /0 ft. = So ft.4.
J.;,.,.,...,...,.,.,...,.,.,., .
.....,.,.J.J.J J.J.J.J.J.J.;.
J.J.J•J•/•J•J.J•J J.J./•J.J.J.J• idth 510 ft.
J•J•J•J.J•J•J•
,J.I.J.l•J./•I.I•J. J. J.J.I.J./.J.
E. ROCK VOLUME Lwgth --'
1. Multiply rock area by rock depth to get cubic feet of rock;
Soo sq. ft. x / ft. =SUo cu. ft.
2. Divide cu. ft. by 27 cu. ft. /cu. yd. to get cubic yards;
Soo cu. ft. + 27 - /.F. S cu. yd.
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
/& S cu. yd. x 1.4 ton/cu. yd. = Z 6 tons.
F. ADSORPTION WIDTH
1. Percolation rate in top 12 inches of soil is 9. o mpi
2. Select allowable soil loading rate'from table;
4IE 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+ o. 0.0 gpd/ft2 = Z . o
4. Multiply adsorption width ratio by rock layer width to het
required adsorption width;
z. o x /o ft..,20 ft
A W%dthSisn Lbit
PVMV1AtMRar
Q6,; „,h
Soil Texture
C.A-
rte
a...♦
s
Faster thin 0.1
Coarse Sand
120
1.00
0.I to 5
Sand
120
1.00
0.1 to 5
Fine Sand-
0.60
2-00
6 to 15
Sandy Loam
079
152
16 to 30
Loam
0.60
2.00..
31 to 45
Silt Loam
OSO
2.40
46 to 60
Clay Loam
0.45
2.67
61 t0120
Clay
024
5.00
Slower than 120
C1a
"sal ha" sm W was of am w vwy Am aar.&
1. Select number of perforated laterals 3
2. Select perforation spacing = .7 • O feet.
3. Since perforations should not be placed closer than 1 ft. to
the edge of the rock layer (see diagram), subtract 2 ft. from
the rock layer length
�— ft. = '?<P feet.
Rock
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 = `>P ft. + 3 ft.= /6 spaces
(3) (2)
5. Number of perforaticns is equal to one plus the number of
perforation spaces.
/6 spaces + 1 - / 7 perforations/lateral
6. Multiply perforations per lateral by number of laterals to
get total number of perforations.
�a x � ,�= S/ perforations.
7. Determine required flow rate by multiplying
number of perforations by flow per perforation
S/ .7y
Path
a X �3
� =8 gpm.
• 8. If laterals are connected to header pipe as shown on upper
example, to select minimum requited lateral diameter, enter
table with perforation spacing and number of perforations
per lateral. Select minimum diameter for
perforated lateral = 2- inches.
9. If perforated lateral system is attached to manifold pipe near
the center, lower diagram, 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 • inches.
00 PERFORATION OF A PERFORATED LATERAL
bas Cwnr
.
Lata! SWW LA)W
K 6Nletat FMIk for Iii
M b► or Wine o.nM
Pd rum P18W)
Wn
orei11Y orald "Whimm rttr
�-f
lIi PMn Y Lame t2' h r/p
01 •/ Itcd Lerlr
i�r :.:, /artuNkrr
Located at
' Cla Saw/ Lars Gonna of Lowed
odo" Sall ►r000rtr scermd
actor. Plsdq sen/ tar.
tt„•a.. r.r�..r.. a.�t�.,s.
V �,IYN prr wwne kr•�
D=
,p
11.
1 1�
uno
2.5
14
1.0a
0.56
3.0
2.Ob
0.80
1.04
a. Use for single family }wags
b. Use for all other app"tions
Maximum number of quarter inch perforations
lateral to guarnantre < 10% discharge variatic
perforation
Sikec)g
11.
1 1�
2
2.5
14
18
2E
3.0
13
17
2E
3.3
12
16
.21
4.0
11
15
2"
5.0
10
14
2:
WIN~ ~110 as t•o v PoRm" trro-o~
Lor -.s of Soil Borings
Location .or project L PrP — Lam: 2—
N _ r
'
Borings made by e'p _ Date
Classification System: AASFIO ; USDA -SCS I, Unified other
-Auger used (check two): Hand �, or Power _ _; Biipht _, or Bucket other
Depth, Boring number' Dapth, norinr number I
in
Surface elevation . in Surface elevation
feet feet
n^- - - 0 — ------i
lyFD 13RvwN c1.�y
077L0D
End of boring at . -?n fec�e•
Standing water table:
Present at feet of depth,
hours after boring.
Not present in borinc t1:J:.e �—•
• Mottled soil:
Observed at dLG+& of depth.
tlot present in boring hole _
Observations and eosments:
",oi•+L.o i1eJ. L�k.CL.Nl
End of boring at -fest.
Standing water table:
Present at feet of -depth,
I
- . :lours after horinr. i
Not present in bor;•r? hole --rte -
Vottled soil:
Observed at ___ twat of dept},
Not present in boring hole
Observations and comment:
Logs of Soil Borings �l_1fI
i.ncacion .or Project L dti " -
C9"��/f! JPG•- -� ••` C'
Borings made by •bi7/V --, Date -
Classification System: AASE10 USDA-SCS -4_; Unified ; other
.Auger used (check two) : Eland , or Power_; Flight _, or ?bucket X- other
Depth. Boring numher:
in Surface elevation •
fact
13z'4'Ck L.o'#/--1
r L L o (OJ �. L,� y t���•,
NnTrL1.�4 yc[G�••, C3x.
End of boring at feet.
Standing water table:
14•esent at feet of depth,
hours after boring.
Hot present in borinp hole _•
r
Mottled il:
Observe., .t feet of depth.
tiot rresent in boring. hole —_
Observations and comments:.
INot present in oorinr "amu
Observations and comments:
Logs of Soil Borinr,s 13-18
Location .or Project rU/L+L�
Borings made by b.12& �%"/P�/R! �lr- Data
Classification System: AASHO USDA -SCS—; Unified other ..-Auger used (checP two): Hand , or Power _: Flight _, or Bucket X_: other
Depth, Boring nurrher. Depth, 3orinr number _.....
in Surface elevation feet
Surface elevation
fact
.n --. - - n — ---
13L��X 0/YAl
1_ 1—
2- ?—
Ha-rT��o yd14 QK.
3— e- Loyy 3 --
4 —
5 —
6 --
7 —
8 —
End of boring at feet.
Standing water table:
Present at feet of depth,
hours after borin;:.
Plot, present in boring hole —•
Mottlad soil:
Observed'at East of depth.
Piot present in boring hole —_`•
Obsurvations and coaments:
4-
5 --
6 —
7 —
8 —
id of boring at feet.
:andinp- water table:
esent at feet of. -depth,
hours after boring.
)t present 'in boring hole
)ttled soil:
iservad at fact of depth.
of present in borinr. hole
bservations and comments:
TAkU
B-39
PERCOLATION TEST DATA SHEET
Test hole location/C/���F��/t/-LV/- �LOC"'dole number
Date test hole was prepared De th of hole bottom
p 141 inches.
Diameter of hole,_ inches. —�
Soil data from test hole:
Depth, inches Soil texture
n
Method of scratching sidewall _ S4ifri;
Depth of pea-sized gravel in bottom of hole, 2 inches.
Date and hour of initial water filling '-l/ - j) .�''!ted P
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_ L
Percolat:an test readings made by IL& ,
starting at
(date) .m.
during test, Y -IV inches.
n�42 rirfr on
Maximum water depth above hole bottom
Percolation rate - / /, � Z minutes per inch.
L'-39
PERCOLATION TEST DATA SHEET
3
Test hole location &/ /F/t 7,9/L/-LdT24/JLxk-2itolc number
u
Dace test hole was prepared . r_6y_26 Depth of hole boct_=,_LY_ inchc!?.
Diameter of hole, 6— inches.
Soil data from test hole:
Depth, inches Soil texture
--
Method of scratching .sidc 4alI G
Depch of pea-sized gravel in bottom of Bole, —? -_ illcliu!:.
Date and hour of initial water filling y-2so S ---
Depth
— -
Depth of initial water fillinL, / 2 inches above hole bot_o::s.
`ached used to caintaia at least 12 inclics of water depth in hole far at
4 hours J? =' FJ' L ) --
Percolation test readinZs made by
r-!210
starting at C)
(dace)
�,. during test, 2 inches.
y'4Rv
U :1
tta::irau.1 water depth above hole otj.
minutes Per ittcn.
race
Percolation
Time
Percolation
Time
Interval, Measurement,
Drop in water
rate,
Re :arks
Minutes inches
level, inclics
minutes per
inch
& 06;A1
r
Il
��
minutes Per ittcn.
race
Percolation
L'-39
PERCOLATION TEST DATA SHEET
Test hole location Au L 1 ee7_a& - L e / - z Bkock-2 role number
Date test hole was preparedj� L-�— �Q Depth of Bole boccom,l incise
Diaceter of stole, inches.
Soil data from test hole:
Depth, inches Soil texture
Xac`od of scratching .sidewan _ STGhL'�_'____ __ ___.......
Depth of pea-sized gravel in bottom o� Bole, _�_ inches;. �+
Date and hour of initial water fillinfy_ * -
Depth of initial water filling, 12 inches above hole bottotn.
;set'.'.^.od used to maintain at least 12 inches of ..atcr depth in hole for at IC:iL t
4 hours 'C �r �. L
Dercolacion test readings made by os�
starting at �_ 3G �.:�. xnxim.urs wattr depth above
(date)
�. during test, % inches.
nfu
Time
Percolation
Time Interval,
Measuremenc,
Drop in water
rate, Remarks
Minutes
inches
level, inches
minutes per
inch L f
it
�
S
O
Sp
�tt 77
%.
/y
Percolation rate
.'27 minutes per inch.
y
c -3v
PERCOLATIOU TEST DATA SHEET
Test hole location f,uLLy ON —LOT 2 10 — 2-itole number
u
Date test hole was prepared -s'— L/ -9Q Depth of hole boccom,_
Diameter of hole, �_ inct,us.
Soil data from test hole:
Depth, inches Soil texture
-/y 9 4,o g y
X61thod of scratching .sidewall
Depth of pea-sized Gravel in botcoen of hole,
Date and hour of initial water filling
Depth of initial water filling, % Z inches above hole boccom.
;tethod used to maintain ac least 12 inches of cater depth in hole for at le sL
4 hours �fC F/ L L
Percolation test readings made by N
S --S--20 starting at /1 _
ZZ
(date)
�. during test, � inches.
M
. Maximum watcr depth above hole b:ic:
Time
Time Interval, Measurement,
Minutes inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
-
�L.
, U�d
4
2. nct
1239
Z2: Yb
t i r
is
-7 7/f,
�2 minutes per inch.
?ercolation rate i
1:-39
PERCOLATION TEST DATA s-ii-rrT.
Test hole locatiornLi & —1.d /_ tole number
u'
Dace test hole was prepared—r--6L 9/ Depth of bole bottom, -I
Diameter of hole, /— inches.
Soil data frost test hole:
Depth, inches Soil texture
L k, oil 'A
M6thod of scratching .sidawall —74
Depth of pea-sized gravel in bottom of hole, inches. a
Date and hour of initial water filling ~� /I•
Depch of initial water filling, Z inches above hole botco:,-,.
Mechod used to maintain ac. least 13 inches of water depth in hole for at least
4 hours 01 - L IL
Percolation test readings made by
-s- 9 i starting at
�.rt.
(date)
�•, during test, inches.
VR0
'PAZ Ezza.. on
. Maximum water depth above holt boc
minutes per +•�•••
Percolation race '
is -39
PERCOLATION 'TEST DATA SHUT
Test hole locationLleg7&—Lj)�+1���9 Z ole number
Data test hole was prepared, Depth of hole bottom,_� '-ncilc
Diameter of hole, �_ inclics.
Soil data from test hole:
Depth, inches Soil texture
ethod of seratc ling, .s, do +al_l
Depth of pea-sized Gravel in bottom aL lioic,
Date and hour of initial %4atcr filling
Depth of initial water ff11in[;, Z inck:cs above hole bottom-
Xet:^.od used to maintain ac lust 12 inches of later depth in hole for at lc::�e
N -. 1 1
4 hours 4—
percolation test readings made by ~
starting at
(date) 7
during test, inches.
)P hC'PL V:1
. Maxim.un water depth above 11011 boc
'-/ minutes pec int«.
Percolation rate 0 C
Q O� tivit lay✓
d t oc k 2
coal, SJ C) w
/ I t
/ P"SG
0
i -c tiro
(N:# d60 616�f : •
dX t'w6 � Z cacu
/ 1
wn.3J � 1
0
oti / E-- /Ao/II6I I
,Ti J IONS AS Nnit")
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