HomeMy WebLinkAboutSeptic design-2007 .
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' �usty Olson's--Soil and Percolation Testing
Joseph J. Olsoo--MPCA License #810
11481 Riverview Rd. NE, Hanover, MN 55341
(763) 498-8779 fag (763) 498-8290
Revised February 09,2007
Bruee Paddock
Proposed Lot 1,Block 1
Tract C,RL.S.#843
Orono,Hennepin County
This on-site Sewage Treatment System is partially designed for a Type 1,five-bedroom home in accordance
with the Minnesota Pollution Contro(Agency Chapter 7080 and local ordinances.
Once the house size, location and septic primary and future sites are chosen this design can be completed.
The seasanally saturated soils were located at 14"-24"(mottled soil). Due to the seasonally saturated soils,
a pressurized Mound System wil(need to be installed to treat septic effluent. The bottom of the treatment
area must be located at least 3' above the satwated soils.
The soils at a depth of 12"have a percolation rate averaging 22 MPI.
A pumping chamber will need to be installed to lift the ef�luent to the treatment area. The power supply and
switches must be located outside the manhole and pumping chamber in a weatherproof enclosure. A
warning device must be installed with a light and sound device;this is in case of a pump failure.
Keep all heavy equipment off of the proposed treatment areas before and after construction. The
treatment area must be fenced off before construction begins. This Design is not valid&the System
will need to be relocated if failure to protect the areas proposed for the On-Site Sewage Treatment
systems occurs.
Nothing other thac�gray water,(laundry,showers,ect.)human water&toilet tissue should be disposed of
into the septic t�lnks. Garbage disposals are not recommended. Additives must no be used,they may cause
harmful damage to your septic system. It is recommended that you pump the septic tank every year for 1
tank,every two years for two tanks.
Sincerely,
,� —� sEP'TtCITY C?F dR�NO� W
�;-' tNSPECTUR �-���.1%1� 1��,�.;
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� Joseph J.Olson � A�P�VED�$�t7�;s,i}'rT���'. ...�.
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TRlATMlNT
PROORAY �
University of Minnesota Mound Design Worksheet
Greatsrthan 1%Slopes
A. FLOW
Estimated 750 gpd(see figure A-1)
or measured x 1.5(safety factor)= 0 gpd
B. SEPTIC TANK IIQUID VOLUMES
Septic tank capacity 3000 gallons(see figure C-1)
Number of tanks/compartments 0
Effluent Filter (yeslno) yes
C-1 Septic Tank Capacity in Gallons
Number of Minimum Capacity with Capacity with
Bedrooms Capacity Garb.Disp. Disp.and Lift
2 or less 750 1125 1500
3 or 4 1000 1500 2000
5 or6 1500 2250 3000
7,8 or 9 2000 3000 4000
C. SOILS(Site evaluation data)
1. Depth to restricting layer= 1.8 feet
2. Depth of percolation tests= 12 inches
3. Texture loam
4. Soil loading rate(see Figure D-33) 0.60 gpd/ftz
Percolation rate 22 MPI
5. %Land Slope 6.0 %
D. ROCK LAYER DIMENSIONS
1. Multiply average design flow(A)by 0.83 to obtain required area of rock layer:Item A x 0.83=
750 gpd x 0.83 ftz/gpd= 630 ftz
2. Determine rock layer width =0.83 ft`Igpd x Linear Loading Rate(LLR)(see LLR chaR
0.83 ftz/gpd x 12.00 = 10.0 ft
LLR Chart
Perk Rate LLR
<120 MPI <=12
>=120 MPI <=6
3. Length of rock layer=area divided by width=
630.0 ft2 / 10.0 feet= 63.0 ft
E. ROCK VOLUME
1. Multiply rock area by rock depth to get cubic feet of rock
630.0 X 1.0 ft= 630.0 ft3
2. Divide ft3 by 27 ft3/yd3 to get cubic yards
630.0 ft3 I 27 = 23.3 yd3
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
23.3 yd3 X 1.4 ton/yd3 = 32.7 tons
Page 1 of 5 Y . �'',
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, F. ABSORPTION WIDTH Absorption ratio: 2
1. Absorption width equals absorption ratio times rock layer width Site A
2.00 x 10.0 ft = 20.0 ft
G. MOUND SLOPE WIDTH 8�LENGTH(Greater than 1%)
1. Downslope absorption width=absorption width minus rock layer width
20.0 feet - 10.0 feet= 10.0 ft
2. Calculate mound size
UPSLOPE
a.Depth of clean sand at upslope edge of rock layer=3 feet minus distance to restricting layer(C1)
3.0 ft - 1.8 ft= 1.2 ft
b.Mound height at the upslope edge of rock layer=depth of ciean sand for separation(G2a)
at upslope edge plus depth of rock layer(1 foot)to depth of cover(1 foot)
1.2 ft+1ft+1 ft= 3.2 ft
c.Upslope berm multiplier based on land slope(see figure D-34)
Selected berm multiplier: 3.23
d.Upslope width=berm multiplier(G2c)times upslope mound height(G2b):
3.23 x 3.2 ft = 10.4 ft
DOWNSLOPE
e.Drop in elevation=rock layer width(D2)times percent landslope(C5)/100
10.0 ft x 6.0 % /100= 0.6 ft
f.Downslope mound height=depth of clean sand for slope difference(G2e)
at downslope rock edge plus the mound height at the upslope edge of rock layer(2b)
0.6 ft + 3.2 ft= 3.8 ft
g.Downslope berm multiplier based on percent land slope(see Figure D-34
Selected berm multiplier: 5.26
h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2�
5.26 x 3.8 = 20.0 ft
i.Select greater of G1 and G2h as the downslope width 20.0 ft
j.Total mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i)
10.4 ft+ 10.0 ft+ 20.0 ft= 40.4 ft
k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d)
10.4 ft + 63.0 ft+ 10.4 ft= 83.8 ft
Final Dimensions (slope>1%) 40.4 ft x 83.8 ft
I hereby certify that all work has been completed in accordance with all applicable ordinances,rules&laws.
a
(signature) 81U (license#) 12/19/2U06 (date)
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Page 2 of 5 `_ -
H. SAND VOLUME
1. Upslope Volume+ Volume under rockbed+Downslope Volume Site A
a.Upslope Volume:(depth of clean sand+1)x(upsiope berm) x(mound length)/2=ft3
2.2 ft x 10.4 ft x 83.8 ft /2 = 958.7 ft3
b.Volume under rockbed: (average depth of sand under rock)x(rockbed width)x(mound length)=ft3
1.5 ft x 10.0 ft x 83.8 ft = 1257.0 ft3
c.Downslope Volume: (depth of clean sand+1)x(downslope berm)x(mound length)/2=ft3
2.8 ft x 20.0 ft x 83.8 ft / 2 = 2346.4 ft3
Total cubic feet: = 4562.1 ft'
2. Divide ft3 by 27 ft31yd3 to get cubic yards
4562.1 /27 = 169.0 yds3
3. Multiply cubic yards by 1.4 to get weight of sand in tons
169.0 yds3`1.4 236.6 tons
4 Add 10%for Constructability
236.6 tons x 1.1 = 260.2 tons
A-1 Estimated Serrage Flows in GPD
No.of
Bdrms Class I Class II Class III Class IV
2 300 225 180 60%of
3 450 300 218 the
4 600 375 256 values
5 750 450 294 in the
6 900 525 332 Class I,
7 1050 600 370 II or II
8 1200 675 408 columns
D-33 Abso tion Width Sizin Table
Perc Rate Soil Texture Loading Rate Absorption
mpi gpd/sq ft Ratio
Coarse sand
<5 Loamy sand 1.20 1.00
Med.,Fine sand
6-15 Sand loam 0.79 1.50
16-30 Loam 0.60 2.00
31�5 Silt Loam,Silt 0.50 2.40
46-60 Clay loam,Silty 0.45 2.67
or Sand Cla Loam
61-120 Silty or Sandy
Clay or Clay 0.24 5
>120'
'Must be other or rformance.
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Page 3 of 5 �"'`M'� ��
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Site A
� � � 12"topsoil
1.2
riginal grade
Restrictive layer 1.8
10.4 10.0 20.0
.
30.0
absorption width
Mound Detail: Land slope> 1%
10.4
Upslope berm:
....................................................................... ............................................................................................................_...-
Rockbed
10.4 Width: 10.0 10.4
Total Length: 63.0
Width:
40.4
Downslope berm: Downslope absorption width:
20.0 10.0
Total length: 83.8 -
Notes:
Divert surface water away from mound.
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s�„�� Site B lot 1 block 1 Job#�
TRL'ATMlNT
PROORAM �. "
University of Minnesota Mound Design Worksheet
Greater than 1%Slopes
a F�ow
Estimat�d 750 gpd(see figure A-1)
or measured x 1.5(safety factor)= 0 gpd
B. SEPTIC TANK LIQUID VOLUMES
Septic tank capacity 300o gallons(see figure C-1)
Number of tankslcompartments 0
Effluent Filter (yes/no) yes
C-1 Septic Tank Capacity in Galbns
Number of Minimum Capacity with Capacity with
Bedrooms Capacity Garb.Disp. Disp.and Lift
2 orless 750 1125 1500
3 or4 1000 1500 2000
5 or6 1500 2250 3000
7,8 or 9 2000 3(�0 4000
C. SOILS(Site evaluation data)
1. Depth to restricting layer- 1.1 feet
2. Depth of percolation tests= 12 inches
3. Texture loam
4. Soil loading rate(see Figure D-33) 0.60 gpd/ftz
Percolation rate 22 MPI
5. %Land Slope 4.0 %
D. ROCK LAYER DIMENSIONS
1. Multiply average design flow(A)by 0.83 to obtain required area of rock layer:Item A x 0.83=
750 gpd x 0.83 ft2/gpd= 630 ftz
2. Determine rock layer width =0.83 ft`/gpd x Linear Loading Rate(LLR)(see LLR chart
0.83 ft2lgpd x 12.00 = 10.0 ft
LLR Chart
Perk Rate LLR
<120 MPI <=12
>=120 MPI <=6
3. Length of rock layer=area divided by width=
630.0 ft2 / 10.0 feet= 63.0 ft
E. ROCK VOLUME
1. Multiply rock area by rock depth to get cubic feet of rock
630.0 X 1.0 ft= 630.0 ft'
2. Divide ft3 by 27 ft'lyd3 to get cubic yards
630.0 ft3 / 27 = 23.3 yd3
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
23.3 yd3 X 1.4 ton/yd3 = 32.7 tons
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Page 1 of 5 ��'� � L`
. F. ABSORPTION WIDTH Absorption ratio: 2
1. Absorption width equals absorption ratio times rock layer width Site B
2.00 x 10.0 ft = 20.0 ft
G. MOUND SLOPE WIDTH 8�LENGTH(Greater than 1%)
1. Downslope absorption width=absorption width minus rock layer width
20.0 feet - 10.0 feet= 10.0 ft
2. Calculate mound size
UPSLOPE
a.Depth of clean sand at upslope edge of rock layer=3 feet minus distance to restricting layer(C1)
3.0 ft - 1.1 ft= 1.9 ft
b.Mound height at the upslope edge of rock layer=depth of clean sand for separation(G2a)
at upslope edge plus depth of rock layer(1 foot)to depth of cover(1 foot)
1.9 ft+1ft+1 ft= 3.9 ft
c.Upslope berm mu�tiplier based on land slope(see figure D-34)
Selected berm multiplier: 3.45
d.Upsiope width=berm multiplier(G2c)times upsiope mound height(G2b):
3.45 x 3.9 ft = 13.5 ft
DOWNSLOPE
e.Drop in elevation=rock layer width(D2)times percent landslope(C5)I 100
10.0 ft x 4.0 % I 100= 0.4 ft
f.Downslope mound height=depth of clean sand for slope difference(G2e)
at downslope rock edge plus the mound height at the upslope edge of rock layer(2b)
0.4 ft + 3.9 ft= 4.3 ft
g.Downslope berm muitiplier based on percent land slope(see Figure D-34
Selected berm multiplier: 4.76
h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2fl
4.76 x 4.3 = 20.5 ft
i.Select greater of G1 and G2h as the downslope width 20.5 ft
j.Totai mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i)
13.5 ft+ 10.0 ft+ 20.5 ft= 44.0 ft
k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d)
13.5 ft + 63.0 ft+ 13.5 ft= 90.0 ft
Final Dimensions (slope>1%) 44.0 ft x 90.0 ft
I hereby certify that all work has been completed in accordance with all applicable ordinances,rules&laws.
(signature) 81U (license#) 12/1912006 (date)
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Page 2 of 5 �'� � . ,_ .. .'�... �� �K� �,,� ��'�
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� H. SAND VOLUME
1. Upsiope Volume+ Volume under rockbed+Downslope Volume Site B
a.Upslope Volume:(depth of clean sand+1)x(upslope berm) x(mound length)I 2=ft3
2.9 ft x 13.5 ft x 90.0 ft /2 = 1761.8 ft3
b.Volume under rockbed: (average depth of sand under rock)x(rockbed width)x(mound length)=ft'
2.1 ft x 10.0 ft x 90.0 ft = 1890.0 ft3
c.Downslope Volume: (depth of clean sand+1)x(downslope berm)x(mound length)/2=ft3
3.3 ft x 20.5 ft x 90.0 ft / 2 = 3044.3 ft3
Total cubic feet: = 6696.0 ' ft3
2. Divide ft3 by 27 ft'/yd3 to get cubic yards
6696.0 /27 = 248.0 yds3
3. Multiply cubic yards by 1.4 to get weight of sand in tons
248.0 yds3x 1.4 347.2 tons
4 Add 10%for Constructability
347.2 tons x 1.1 = 381.9 tons
A-1 Estimated SeYrage Flows in GPD
No.of
Bdrms C�ass I Class II Class III Class IV
2 300 225 180 60%of
3 450 300 218 the
4 600 375 256 values
5 750 450 294 in the
6 900 525 332 Class I,
7 1050 600 370 II or II
8 1200 675 408 columns
a33 Abso tion Width Sizin Table
Perc Rate Soil Te�ure Loading Rate Absorption
mpi gpolsq ft Ratio
Coarse sand
<5 Loamy sand 120 1.00
Med.,Fine sand
6-15 Sand loam 0.79 1.50
16-30 Loam 0.60 2.00
31�15 Silt Loam,Silt 0.50 2.40
46-60 Clay loam,Silty 0.45 2.67
or Sand Cla Loam
61-120 Silty or Sandy
Clay or Clay 0.24 5
>120'
'Must be other or performance.
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Site B
� � � 12"topsoil
1.9
riginal grade
Restrictive layer 1.1
13.5 10.0 20.5
w ►. .: - -
30.5
'. -.
absorption width
Mound Detail: Land slope> 1%
13.5
Upslope berm:
:.......................................................�--------�-----••---...................................•--•-�--..........................................-�---................_....
Rockbed
13.5 Width: 10.0 13.5
Total Length: 63.0
Width:
44.0
Downslope berm: Downslope absorp6on width:
20.5 10.0
Total length: 90.0 _
Notes:
Divert surface water away from mound.
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Loqs of Soii Borings
License#810
Location or Project: Proposed Lot 1, Block 1
Borings made by: Rusty Olson's Soil and Perc testing 12/1/2006
Classification System: AASHO ; USDS-USDS-SCS X ; Unified ; Other
Auger used (check two): Hand_X_, or Power_, Flight, Bucket or Probe_X_
Boring Number_1_Surface elevation_987.6_ Mottled Soil at_2.0_feet
0"-18" Dark brown loam 10yr3/2 H20 present at_X_
18"-24" Brown loam 10yr4/4
24"-30" Rusty brown loam 10yr5/3
Boring Number_2_Surface elevation_987.7_ Mottled Soil at_1.8_feet
0"-14" Dark brown loam 10yr3/2 H20 present at_X_ .
14"-22" Brown loam 10yr4/4
22"-30" Rusty brown loam 10yr5/3
Boring Number_3_Surface Elevation_985.3 Mottled Soil at_1.3_ feet
0"-6" Dark brown loam 10yr3/2 H20 present at_X_.
6"-16" Brown loam 10yr4/4
16"-30" Rusty brown loam 10yr5/4
Boring Number 4_ Surface elevation_985.2_ Mottled Soil at_1.1_ feet
0-6" Dark brown loam 10yr3/2 H20 present at_X_
6"-14" Brown loam 10yr4/4
14"-24" Rusty brown clay loam 10yr5/3
24"-30" Rusty brown loam 10yr5/3
Boring Number_5_Surface elevation_985.5_ Mottled Soil at_1.3_feet
0-8" Dark brown loam 10yr3/2 H20 present at_X_
8"-16" Brown loam 10yr4/4
16"-30" Rusty brown loam 10yr5/4
Boring Number 6_Surface elevation_986.7_ Mottled Soil at_1.5_feet
0-14" Dark brown loam 10yr3/2 H20 present at_X_
14"-18" Brown loam 10yr4/4
18"-30" Rusty brown clay loam 10yr5/3
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Percolation Test Data Sheet
Lic.#810
Percolating test readings made by: Rusty Olson's I�erc. starting at 10:25 A.M. On12/06/06
Location: Proposed Lot 1, Block 1
Hole number: 1
Date hole was prepared:12/05//06
Depth of hole bottom_12"_inches, Diameter of hole_6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-12" Dark brown loam 10yr3/2
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date of initial water filling 12/5/2006 depth of initial 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 Automatic Siphon
Maximum water depth above hole bottom during tests 6 inches
Time Time Depth Drop in H20 Perc Rate
10:35 11:05 6" 1.5 20.0
11:12 11:42 6" 1.5 20.0
11:43 12:13 6" 1.5 20.0
AVERAGE PERC. RATE 20.0 MPI
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Percolation Test Data Sheet
Lic.#810
Percolating test readings made by: Rusty Olson's Perc. starting at 10:25 A.M. On12/06/06
Location: Proposed Lot 1, Block 1
Hole number: 2
Date hole was prepared:12/05//06
Depth of hole bottom_12"_inches, Diameter of hole_6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-12" Dark brown loam 10yr3/2
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date of initial water filling 12/5/2006 depth of initial 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 Automatic Siphon
Maximum water depth above hole bottom during tests 6 inches
Time Time Depth Drop in H20 Perc Rate
10:36 11:06 6" 3.5 8.5
11:11 11:41 6" 3.3 9.1
11:44 12:14 6" 3.2 9.4
AVERAGE PERC. RATE 9.0 MPI
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Percolation Test Data Sheet
Lic.#810
Percolating test readings made by: Rusty Olson's Perc. starting at 10:25 A.M. On12/06/06
Location: Proposed Lot 1, Block 1
Hole number: 3
Date hole was prepared:12/05//06
Depth of hole bottom_12"_inches, Diameter of hole_6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-6" Dark brown loam 10yr3/2
6"-12" Brown loam 10yr4/4
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date of initial water fiiling 12/5/2006 depth of initial 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 Automatic Siphon
Maximum water depth above hole bottom during tests 6 inches
Time Time Depth Drop in H20 Perc Rate
10:37 11:07 6" 1.0 30.0
11:10 11:40 6" 1.0 30.0
11:45 12:15 6" 1.0 30.0
AVERAGE PERC. RATE 30.0 MPI
Percolation Test Data Sheet
Lic.#810
Percolating test readings made by: Rusty Olson's Perc. starting at 10:25 A.M. On12/06/06
Location: Proposed Lot 1, Block 1
Hole number: 4
Date hole was prepared:12/05//06
Depth of hole bottom_12"_inches, Diameter of hole 6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-6" Dark brown loam 10yr3/2
6"-12" Brown loam 10yr4/4
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date of initial water filling 12/5/2006 depth of initial 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 Automatic Siphon
Maximum water depth above hole bottom during tests 6 inches
Time Time Depth Drop in H20 Perc Rate
10:38 11:08 6" 1.0 30.0
11:09 11:39 6" 1.0 30.0
11:46 12:16 6" 1.0 30.0
AVERAGE PERC. RATE 30.0 MPI
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