HomeMy WebLinkAbout1996-07-20 Septic System Design ReportS-P TESTING., INC. Steven B. Schirmers - MPCA Cert. No. 627
951 Katydid Lane NE - St. Michael, MN 55376 - (612) 497-3566
FAX (612) 497-5011
State License #394
July 20, 1996 , 1
Ery Cam
763 No.Femdale
Orono, Henn. Co., MN
This site has an existing failing system which is surface discharging which is an
imminent health hazard and must be repaired or disconnected within 10 months. Soil
Borings completed in the area of the existing system found saturated soil (mottled soil)
less than 3' from the bottom of the system which also classifies this system as failed. A
new system will need to be installed.
This On -Site Sewage Treatment System is Designed for a Type 1, four bedroom home
in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local
ordinances.
The soils on this site are SCS soils mapped - HcC2 - Hayden Gay loam. The seasonally
saturated soils were located at 62" & 68" (mottled soil). The bottom of the treatment
area must be located at least 3' above the seasonally saturated soils. A Standard
Trench System may be installed north of the house.
The soils at a depth of 24" & 30" have a percolation rate averaging 18.2 mpi.
A pumping chamber will need to be installed to lift the septic 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.
All neighboring wells are located greater than 100' away from the proposed treatment
area.
The existing tanks may be used upon approval by the local Inspector. The tanks must
be water tight. Surface run off flows over the tanks and must be diverted away from the
tanks to prevent surface water from seeping into the tanks.
Keep all heavy equipment off of the proposed treatment area before and after
construction. The treatment area should be marked off before construction. This
Design is not valid & the system will need to be relocated if failure to protect the areas
proposed for On -Site Sewage Treatment occurs.
With proper installation and maintenance, this system should have no problem in
treating septic effluent effectively.
Nothing other than gray water (laundry, showers, etc.) should be disposed of into the
septic tanks. Garbage disposals are not recommended, due to adding more solids &
fine solids passing through to the system. Excessive amounts of soaps, cleaning agents
& chlorine agents may kill the bacteria needed to treat septic effluent. Additives are not
recommended. Recommend to pump & clean your tanks through the manhole by a
certified pumper every 2 years. Check with your pumper to set up a schedule.
even 9chirmers
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INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEE'1'
J
FLO%V
A.
Estimated r r, gpd
measured x 1.5= - gpd
SEPTIC TANK VOLUME
B.
gallons
SOILS (Site evaluation data)
G
Depth to resti;-:ing layer = jr-;' 7 '%-'= feet
D.
Maximum der-h of system C - 3 ft = feet
E.
Percolation rave 12.4 M171
F.
SSF L2,n- sq i-/gpd
TRUnCH BOTTOM AREA
H_
For trenches Kith 6 inches of rock below the pipe:
A x F = x = _ sq ft of bottom area
1.
For trenches with 12 inches of rock below the pipe: p'
A x F x OS = , -c rrx x 0.8 = `L ( sq ft of bottom area.+Ids0:yV
J.
For trenches with 18 inches of rock below the pipe: "K= 90o141,T
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
BED BOTTOM AREA
L
For seepage beds with 6 or 12 inches of rock below the pipe;
1SxAxF=1-5x_x`=^sgftofbottom area
ROCK VOLUME IN CU FT
K
Rock depth below distribution pipe plus OS foot times bottom area:
M =Rock depth + 6 inches x Area (H,I,J,L,K)
( o +OSf0x:gal =j cvft
ROCK VOLUME IN CU YDS
N.
Volume in cu ft divided by 27
M + 27 = cu yds=.& 27 = H"7 cu yds
ROCK WEIGHT
O.
Cubic yards times 1.4 - tons
N x 1.4 = tons 44c7 x 1.4 = .(ga tons
DISTRIBUTION
(Check one based on slope)
Bed Oess than 6% slope)
Trenches
- Drop boxes (any slope)
Distribution box (level to slightly sloping)
TRENCH LENGTH
r.
Select trench width = _La ft
Q.
Divide bottom area by trench width: (H,1, J, or K) + P =
lineal feet
+ _ = lineal feet bx 'c o
LAWN' AREA
R.
Select trench spacing, center to center = 1L feet
S.
Multiply trench spacing by lineal feet R x Q = sq ft of lawn area
x cr( = Z�-sq ft
LAYOUT (Use other side)
1. Select an appropriate scale; one square =
2. Show pertinent property boundaries, right-of-v%ay, easements.
3. ,-how location of house, garage, driveway, and aL other
improvements, existing or proposed
4. Show location and layout of sewage treatment system.
5. Show location of water supply well.
6. Dimension all set backs and separation distances.
D•25
Est m " St. qe Fier ,a G&Unai M Day jp4)
\utabcr
or
T�ycI
T�pc n
T,;c GI
Ta IV
Bcbonta n
2 300
2.3
I m
Kt
3 �c50
300
211
s
• 600
375
2-44
S 1 750
e5o
2'5k:
3
6 1 900
525
332
a
7 I 1050
600
3,0
1 1200
675
409
NYmtntr
�t ace
St 7"
%4a= -
Gerry �
Of
%d
c
Bedrooms
C. .
Mapes
(Sib=)
(pilaw)
2 or less
750
1.125
3 or a
1.000
1.5W
5 or 6
1,500
2.250
1 or 8
2.000
3.000
over 9
See rig. C-6
(: 1.5)
t�.d.frw iN
Scil TeL ri-e
M•� v
fr'�
►IrV r ps ud
r
trpJ
Faster than 0.1•Cows*
sand
-
0.11oS
Sand
0.41
120
0.1 io 5
Fu a sander
1.67
0.60
61015
5w%drLoam
0.79
16 to 30
Loan
1.6
0.60
31 to 45
5ZI Lot..-i
-100
030
t610 60
Oay Loin
220
0.aS
Slm+c that 60•'•
❑ar
-
(026)
W OYM tM R., ti/rl/l
Aa
�.t..rtnr�...lw.wl
•'s�.1� M
M�w�iJ
.na.ilw.w r M �rtir�
6 inches= 0% Reduction*
12 inches= 20% Reduction
18 inches= 34% Reduction
24 inches= 40% Redudion
• sizing for graveUess trench
T
2 inch Cow
t
4 inch Pipe
1+
6.24 inch
Rock Below the Pipe
I
Figurc D-26
F-17
Asa. Jt• ar r
A. Detezmine pump capacity:
Gravity Distribution
1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of
water use ratV
2- Maximum sugpted-forte ivery to a drop box of a home system is 2,700
gallons per h°u[�9pn .to Prevent build-up of pressure in drop box.
Pressure Distibution
3. a. Select number of perforated laterals
b. Select perforation spacing = feet.
C. Subtract 2 ft. from the rock layer length.
��w - 2 ft. s feet.
d. Determine the number of spaces between perforations.
length perf. spacing = ft. + ft. = spaces
e. spaces + i = pezforationsnatual
f. Multiply perforations per lateral by number of laterals to
get total number of perforations :. x-,_ = perforations.
& -pw x P., gpm.
SELECTED PUW CAPACITY a gpm M A.A_
B. Determine head requirements:
1. Elevation difference between pump and point of discharge.
71-feet
2. If pumping to a pressure distribution system, five feet for pressure
required at manifold if gravityrsystem, zero.
feet
3. Friction loss
a. Enter friction loss table with gpm and pipe diameter.
Read friction loss in feet per 100 feet from table.
F.L. _ _c .a % ft. /100 ft of pipe
b. Determine total pipe length from pump to discharge
point. Add 25 percei t to pipe length for fitting
loss, or use a fitting loss chart. Equivalent pipe
length -1.25 times pipe length =
30D x 1.25 = 3'V _ feet
c. Calculate total friction loss by multiplying
friction loss in ft/100 ft�y equivalent pipe length.
Total friction loss = �< 7 S x 3.; 4C +100 = i �- feet
4. Total head required is the sum of elevation difference,
special head requirements, and total friction loss.
-2y' + + -I Z
(1) (2) l30
TOTAL H All j L feet
G Pump selection
1. A plump must be selected to deliver at least
�� gym (Step A) with at least Li 1, feet of total head (Step B).
m 6*x�
QO ► WOMTIM O/ 1 KWOIIATED LATENL
«� T~
i.Ilw
Imam kam
•_' �.: ' uwr M frlw,r 1Wrr Ir
twA frrt uII, : wi �w+ w .w r rw r.w
.rc r: +�........,
=PIP,
i1
Mrw4� IONM II
eft- 1.4 II,r LN
Prtrto-- ar
h+ Gallons r aT6 eIi
t
3h-6
; ..,.
V"Q
1.0a
0.56
0.74
2.ob
0.80
1.04
a. Use for single family homes
b. Use for all other applications
t Pipe Lmo
POW O(Dbdwp
I:lh7evauan DiBererlx
Wray 1111
F-lEb
1.5 inch 2.0 imh 3.0 inch
am Prhilr IM /t tGO R 1 pip
10
0.69
0.20
12
0.96
0.2E
14
1.2E
0.3E
16
1.63
0.44
18
2.03
0.60
20
2.47
0.73
0.11
25
3.73
1.11
0.16
30
5.23
1.55
0.23
35
7.90
2.06
0.30
40
11.07
2.64
0.39
-45
14.73
3.2E--
0.4E
50
3.99
0.5E
55
4.76
0.70
60
3.60
0.82
S-P TESTING, INC. Steven B. Schirmers - MPCA Cert.No. 627
951 Katydid Lane NE - St. Michael, MN 55376 - (612) 497-3566
FAX - (612) 497-5011
State License #394
Ery Cam
763 No.Femdale
Orono, Henn. Co., MN
Borings completed on 7-15-96, with a hand bucket auger.
BORING NUMBER 1- Elev.127.4 - MOTTLED SOIL AT 57' - No standing water
present in boring.
0 -
10"
Topsoil dark brown loam 10YR 312
10" -
20"
Brown Gay loam 10YR 4/4
20" -
36"
Brown loam 10YR 5/4
36" -
62"
Yellowish brown loam 10YR 6/4
62" -
74"
Rusty olive brown fine sandy silty loam 10YR 6/4 - mottles 6/1,6/6
74" -
84"
Rusty olive brown loam 10YR 6/4
8¢8jRG_NUMBER 2- Elev.130.8 - MOTTLED SOIL AT 5'8" - No standing water
present in boring.
0 -
6"
Topsoil dark brown loam 10YR3/3
6" -
20"
Brown loam 10YR 5/4
20" -
36"
Brown fine sandy loam 10YR 6/4
36" -
58"
Brown loamy fine sand 10YR 6/4
58" -
68"
Yellowish brown loam 10YR 614
68" -
84"
Rusty brown loam 10YR 6/4 - mottles 6/1,616
BORING NUMBER 3- Elev.127.8 - NO MOTTLED SOIL PRESENT IN THE BORING.
0 -
6"
Topsoil dark brown loam 10YR 313
6" -
38"
Yellowish brown loam 10YR 5/4
38" -
66"
Yellowish brown sandy loam 10YR 6/4
66" -
84"
Brown loamy medium sand 10YR 6/4
CERTIFICATION NO.627
STAIE LICENSE NO.394
PEA- OLATION TEST DATA SHEET
Percolation test readings made by S-P TestingInc. on 7-16-96 starting at 12oftm.
Test hole location Fry Cam. 763 Nn_Fnrndala_ Orono.
Test hole number 1, Date test hole was prepared 7-15-96.
Depth of hole bottom 24 inches. Diameter of hole li inches.
SOIL DATA FROM TEST HO . .
DEPTH, INCHES
0 - 101,
10" - 20"
20" - 24"
Tops A dark brown loam
Brown clay loam
Brown
SOIL TEXTURE
Method of scratching sidewall is kn& Depth of gravel in bottom of hole is 2_ias4e Date and hour of initial
water filling 7-15-%, 2_Odn_m_ Depth of initial water filling is 12 inches above the hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours is santomaticajphIl
Maximum water depth above hole bottom during test is ¢ inches.
Time
Time interval min
Measurement,
► ehes
Drop in water level,
inches
Percolation rate,
minutes per inch
Remarks
Water remaining
in test hole
12:03
12:33
_ 6
1-3/16
25.3
30 min
12:38
1:08
6
1-3/16
25.3
30 min
1:09
1:39
6
1-3/16
25.3
30 min
Percolation rate = 25J_Minutes per inch.
CERTIFICATION NO.627
STATE LICENSE. NO.394
PERCOLATION TEST DATA SHEET
Percolation test readings made by S-P Testl'ng, Inc. on 77-16-96 starting at 12:04pm.
Test hole location Cam. 763 No Ferndale= Orono
Test hole number I Date test hole was prepared 77-15-96,
Depth of hole bottom aQ inches. Diameter of hole ¢ inches.
SOIL DATA FROM TEST HOLE
DEPTH, INCHES
min
6" - 20"
Topsoil dark brown loam
Brown loam
20" - 30" Brown fine sandy loam
SOIL TEXTURE
Method of scratching sidewall is kaiftti, Depth of gravel in bottom of hole is 2. ipchm, Date and hour of initial
water filling 7--1&96. 2:OOom_ Depth of initial water filling is 17iarhes above the hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours is jujona& gphM
Maximum water depth above hole bottom during test is ¢ inches.
Time
Time interval min
Measurement,
inches
Drop in water level,
inches
Percolation rate,
minutes per inch
Remarks
Watqr_reqjaining
in test hole
12:04
12:34
_ 6
1-3/8
21.8
30 min
12:37
1:07
6
21.8
30 min
1:10
1:40
6
1-3/8
21.8
30 min
Percolation rate = 21J.minutes per inch.
CERTIFICATION NO.627
STATE LICENSE NO.394
PERCOLATION TEST DATA SHEET
Percolation test readings made b) S-P Testing, L= on 7-16-96 starting at Vim.
Test hole location Ery Cam. 763 Nn_Ferndntn_ Orono
Test hole number J. Date test hole was prepared 7-15-96-
Depth of hole bottom IQ inches. Diameter of hole ¢ inches.
DEPTH,INCHES
EM
6"-30"
Topsoil dark brown loam
Yellowish brown loam
SOIL TEXTURE
Method of scratching sidewall is knife. Depth of gravel in bottom of hole is 2 *nChes Date and hour of initial
water filling 7-15-96, LOO= Depth of initial water filling is 12 insert above the hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours is automatic sigha
Maximum water depth above hole bottom during test is !k inches.
Time
Time interval min
Measurement,
inches
Drop in water level,
inches
Percolation rate,
minutes Lmr inch
Remarks
11:50
prefill
6
12:05
12:35
6
4-3/16
7.2
30 min
12:36
1:05
6
4
7.5
30 min
1:11
1:41
6
3-7/8
7.7
30 min
Percolation rate=1.3ininutes per inch.
F-8
WATER TIGHT 9 LOCKABLE ELECTRIC BOX---,,,, THE ETEp'pOEST�4 x 4 min)
PLUGS OR ELECTRIC CONNECTIONS — /-A, L JIL�C X IC CONNECTIONS MADE
2'PVC CONDUIT SCHEDULE 80 L tiO
MANHOLE COVER CHAINED Bt LOCKEO� 6 DACE [LOOP OF POWER CORD FOR
—�— TTLEME W
SEALED MANHOLE RINGS �� , cuJei /_CA Me
SEALED TANK COVI
PLASTIC ROPE OR CHAIN
WITH ANCHOR ------
ALARM FLOAT ON SEPARATE
ELECTRICAL CIRCUIT
AFU9 lE_VEL.9 _ i-
SHUT- FF_,EVEI`Q
PUMP CONTROL FLOAT
AT LEAST 12-
BELOW GRADE
WIRE FROM POWER SUPPLY
PIPE IS LAID ON A UNIFORM SLOPE FROM
PUMP STATION UP TO SOIL TREATMENT AREA
+� p FOR PROPER DRAINBACK
IF PIPE AT TANK MUST BE LOWER THAN
UNION. TO GET ELEVATION FOR DRAINBACK,
A 1/4 INCH WEEP HOLE MUST BE USED
— WEEP HOLE
NOTES: ELECTRICAL WIRE FROM POWER SUPPLY
MUST NOT RUN OVER ANY TANKS BUT
MUST BE LAID BESIDE OTIIER TANKS
AND MUSE BE PLACED IN CONDUIT
ALONG POST
ELECTRICAL CORDS FROM PUMP AND
FLOATS MUST BE RUN THROUGH
CONDUIT. WIRES CANNOT HAVE GROUND
CONTACT.
METAL
COVER
I ► �
I
CONCRETE
MANHOLE
RING
METHODS OF SECURING MANHOLE COVER TO PREVENT
UNAUTHORIZED ENTRY
Figure C•14
Figure F-8
VERTICAL SIDEWALL SEPTIC TANK
FINISHED GRADE
AT LEAST��:
6" TO 12" SOIL AT _LEAST
4" DIA. COVER 4 DIA.1
4::
I� AT LEAST I" AT LEAST I"
MIN I-_
• _ A DIMENSION$ FOR _TANKS WITH VERTICAL SIDES A
WIDTH. W 24- MINIMUM
T LENGTH, L 2 TO 3 TIMES THE WIDTH
FAT
DIAMETER 60" MINIMUM
DEPTH• D 30" MINIMUM; 79' MAXIMUM C
--A _0.2 D
LEAST B 66"MINIMUMi-0.2 D MAXIMUM
3` c 104 o L
---- • •-AT LEAST 4 FEET ---
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INLET
AWV—
- +gly^ SCUM fir
11
OUTLET
9,
';•ti w,?0 TLET LEVEL - -•
'!
t►
SCUM CLEAR SPACE"— -
s
CLEAN OUT TANM
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- ' ---_
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g
W IS 12" OR LESS
_ _
BLACK COLOR
SLUDGE
i'i
DISTINGUISHES St
�•.r: , ,
LAVER FROM LIOI
iY
MEASURE SCUM AND SLUDGE
ACCUMULATIONS
IN THE SEPTIC TANK