HomeMy WebLinkAboutSoil & Percolation Testing 45 FOY St(Ed-
Rusty Olson's--Soil and Percolation Testing
Joseph J. Olson--MPCA License #810
11481 Riverview Rd. NE, Hanover, MN 55341
(763) 498-8779 fax (763) 498-8290
September 20,2005
Suad Azhari&Omar Abukhadra
Proposed Lot 6
1745 Fox Street
Orono,Hennepin.County
This on-site Sewage Treatment System is partially designed for a Type 1,seven-bedroom home in
accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances.
Once the house size,location and septic site are chosen this design can be completed.
The seasonally saturated soils were located at 18"-24"(mottled soil). Due to the seasonally saturated soils,
a pressurized Mound System will need to be installed to treat septic effluent. The bottom of the treatment
area must be located at least 3'above the saturated soils.
The soils at a depth of 12"have a percolation rate averaging 11 MPI.
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 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 than gray water,(laundry,showers,ect.)human water&toilet tissue should be disposed of
into the septic tanks. 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.
cerely,
Aer
Joseph J.Olson
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University of Minnesota Mound Design Worksheet
Greater than 1%Slopes Lot 6 Site A
A. FLOW
Estimated 1050 gpd(see figure A-1)
or measured x 1.5(safety factor)= 0 gpd
B. SEPTIC TANK LIQUID VOLUMES
Septic tank capacity 3000 gallons(see figure C-1)
Number of tanks/compartments 0
Effluent Filter (yes/no) yes
C-1 Septic Tank Capacity in Gallons
Number of Minimum Capacity with Capacity with
Bedrooms Capacity Garb.Disp. Disp.and Lift
2 or lessa 112514:C-4.1%V
3or4 ,11r,ir , 1500 ' ' aIi
5 or 6 .1504 2250 `� ''
7,8 or 9 d t 3000 r i 0 -
C. SOILS(Site evaluation data)
1. Depth to restricting layer= 1.5 feet
2. Depth of percolation tests= 12 inches
3. Texture loam
4. Soil loading rate(see Figure D-33) 0.60 gpd/ft2
Percolation rate 12 MPI
5. %Land Slope 8.0 %
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=
1050 gpd x 0.83 ft2/gpd= 880 ft2
2. Determine rock layer width =0.83 ft`/gpd x Linear Loading Rate(LLR)(see LLR chart)
0.83 ft2/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=-
880.0
880.0 ft2 / 10.0 feet= 88.0 ft
E. ROCK VOLUME
1. Multiply rock area by rock depth to get cubic feet of rock
880.0 X 1.0 ft= 880.0 ft3
2. Divide ft3 by 27 ft3/yd3to get cubic yards
880.0 ft3 / 27 = 32.6 yd3
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
32.6 yd3 X 1.4 ton/yd3 = 45.6 tons
Page 1 of 5
F. ABSORPTION WIDTH Absorption ratio: 2
1. Absorption width equals absorption ratio times rock layer width
2.00 x 10.0 ft = 20.0 ft
G. MOUND SLOPE WIDTH&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 - 1.5 ft= 1.5 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)
1.5 ft+1ft+1 ft= 3.5 ft
c.Upslope berm multiplier based on land slope(see figure D-34)
Selected berm multiplier: 3.03
d.Upslope width=berm multiplier(G2c)times upslope mound height(G2b):
3.03 x 3.5 ft = 10.0 ft
DOWNSLOPE
e.Drop in elevation=rock layer width(D2)times percent landslope(C5)/100
10.0 ft x 8.0 % /100= 0.8- 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)
0.8 ft + 3.5 ft= 4.3 ft
g.Downslope berm multiplier based on percent land slope(see Figure D-34)
Selected berm multiplier: 4.77 3.5-1
h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2f)
4.77 x 4.3 = 21.0 ft
i.Select greater of G1 and G2h as the downslope width 21.0 ft
j.Total mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i)
10.0 ft+ 10.0 ft+ 21.0 ft= 41.0 ft
k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d)
10.0 ft + 88.0 ft+ 10.0 ft= 108.0 ft
Final Dimensions (slope>1%) 41.0 ft x 108.0 ft
I here certify that all work has been completed in accordance with all applicable ordinances,rules&laws. c}
(signature) 810(license#) A0L-(date)
Page 2 of 5
4"inspection pipe
Lot 6 Site A
0 0 0 12"topsoil
1.5
•riginal grade
Restrictive layer 1.5
10.0 • 10.0 21.0
.. •4
31.0
r •
absorption width
Mound Detail: Land slope> 1%
10.0
Upslope berm:
Rockbed
10.0 • Width: 10.04 10.0
Total Length: 88.0
Width:
41.0
Downslope berm: Downslope absorption width:
21.0 10.0
Total length: 108.0
Notes:
Divert surface water away from mound.
Page 5 of 5
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University of Minnesota Mound Design Worksheet
Greater than 1%Slopes Lot 6 Site B
A. FLOW
Estimated 1050 gpd(see figure A-1)
or measured x 1.5(safety factor)= 0 gpd
B. SEPTIC TANK LIQUID VOLUMES
Septic tank capacity 3000 gallons(see figure C-1)
Number of tanks/compartments 0
Effluent Filter (yes/no) 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 1 r r k
3 or 4 • �` '�1O00 1500
5 or 6 'r, 1500 . 2250 !
7,8 or 9 <2000 3000
C. SOILS(Site evaluation data)
1. Depth to restricting layer= 1.5 feet
2. Depth of percolation tests= 12 inches
3. Texture loam
4. Soil loading rate(see Figure D-33) 0.60 gpd/ft2
Percolation rate 12 MPI
5. %Land Slope 9.0
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=
1050 gpd x 0.83 ft2/gpd= 880 ft2
2. Determine rock layer width =0.83 ft`/gpd x Linear Loading Rate(LLR)(see LLR chart)
0.83 ft2/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=
880.0 ft2 / 10.0 feet= 88.0 ft
E. ROCK VOLUME
1. Multiply rock area by rock depth to get cubic feet of rock
880.0 X 1.0 ft= 880.0 ft3
2. Divide ft3 by 27 ft3/yd3to get cubic yards
880.0 ft3 I 27 = 32.6 yd3
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
32.6 yd3 X 1.4 ton/yd3 = 45.6 tons
Page 1 of 5
F. ABSORPTION WIDTH Absorption ratio: 2
1. Absorption width equals absorption ratio times rock layer width
2.00 x 10.0 ft = 20.0 ft Lot 6 Site B
G. MOUND SLOPE WIDTH&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 - 1.5 ft= 1.5 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)
1.5 ft+ift+1 ft= 3.5 ft
c.Upslope berm multiplier based on land slope(see figure D-34)
Selected berm multiplier: 2.94
d.Upslope width=berm multiplier(G2c)times upslope mound height(G2b):
2.94 x 3.5 ft = 10.0 ft
DOWNSLOPE
e.Drop in elevation=rock layer width(D2)times percent landslope(C5)/100
10.0 ft x 9.0 % /100= 0.9 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)
0.9 ft + 3.5 ft= 4.4 ft
g.Downslope berm multiplier based on percent land slope(see Figure D-34)
Selected berm multiplier. 4.11 3-1 slope
h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2f)
4.11 x 4.4 = 19.0 ft
i.Select greater of G1 and G2h as the downslope width 19.0 ft
j.Total mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i)
10.0 ft+ 10.0 ft+ 19.0 ft= 39.0 ft
k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d)
10.0 ft + 88.0 ft+ 10.0 ft= 108.0 ft
Final Dimensions (slope>1%) 39.0 ft x 108.0 ft
I hereb certify that all work has been completed in accordance with all applicable ordinances,rules&laws.
(signature) 810 (license U) 2joci/aJ date)
Page 2 of 5
4"inspection pipe
Lot 6 SiteB
O O O 12"topsoil
1.5
•riginal grade
Restrictive layer 1.5
10.0 10.0 19.0
..
0-
29.0
absorption width
Mound Detail: Land slope> 1%
10.0
Upslope berm:
Rockbed
10.0 Width: 10.0 10.0
Total Length: 88.0
Width:
39.0
Downslope berm: Downslope absorption width:
19.0 10.0
Total length: 108.0
Notes:
Divert surface water away from mound.
Page 5 of 5
Logs of Soil Borings
License#810
Location or Project: Preliminary Plat Borings for Suad Azhari &Omar Abukhadra Lot 6
Borings made by: Rusty Olson's Soil and Perc testing 3/8/05
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_969.0_ Mottled Soil at 1.5 feet
0"-8"Dark brown loam to sandy loam 10yr3/2 H2O present at X_
8"-18" Brown loam 10yr4/4
18"-30" Rusty brown clay loam 10yr5/4
Boring Number_2_Surface elevation_969.0_ Mottled Soil at 2.0_feet
0-6" Dark brown sandy loam 10yr3/2 H2O present at X_
6"-24" Brown sandy loam 10yr4/4
24"-30" Rusty brown sandy loam 10yr5/4
Boring Number_3_Surface Elevation_969.0 Mottled Soil at_1.5 feet
0"-8"Dark brown loam to sandy loam 10yr3/2 H2O present at_X_
8"-18" Brown loam 10yr4/4
18"-30" Rusty brown clay loam 10yr5/4
Boring Number_4_ Surface elevation_938.5_ Mottled Soil at_1.5_feet
0-18"Dark brown loam 10yr3/2 H2O present at X
18"-26" Rusty brown loam 10yr4/3
26"-30" Rusty brown clay loam 10yr5/4
Boring Number 5_Surface elevation_938.5_ Mottled Soil at_1.8_feet
0-14" Dark brown loam 10yr3/2 H2O present at_X_
14"-22" Brown loam 10yr4/3
22"-30" Rusty brown clay loam 10yr5/4
Boring Number 6_Surface elevation_938.5_ Mottled Soil at_1.6_feet
0-10" Dark brown loam to sandy 10yr3/2 H2O present at_X_
10"-20" Brown loam to sandy loam 10yr4/4
20"-30" Rusty brown loam 10yr5/4
Percolation Test Data Sheet
Lic.#810
Percolation test readings made by: Rusty Olson's Perc. starting at 10:35 A.M. On 09/20/05
Location: Proposed Lot 6, Block 1 1745 Fox Street
Hole number: 1
Date hole was prepared: 09/19/05
Depth of hole bottom_12" inches, Diameter of hole_6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-8" Dark brown sandy loam 10yr312
8"-12" Brown loam 10yr4/4
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date and hour of initial water filling 09/19/05 At 10:30 A.M. 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
I Time Time Depth Drop in H2O Perc Rate
10:45 11:15 6" 3.6 8.3
11:16 11:46 6" 3.5 8.5
11:55 12:25 6" 3.5 8.5
AVERAGE PERC. RATE 8.4 MPI
Percolation Test Data Sheet
Lic.#810
Percolation test readings made by: Rusty Olson's Perc. starting at 10:35 A.M. On 09/20/05
Location: Proposed Lot 6, Block 1 1745 Fox Street
Hole number: 2
Date hole was prepared: 09/19/05
Depth of hole bottom_12"_inches, Diameter of hole_6" inches.
Soil data from test hole:
Depth, inches Soil texture
0-6" Dark brown sandy loam 10yr3/2
6"-12" Brown sandy loam 10yr4/4
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date and hour of initial water filling 09/19/05 At 10:30 A.M. 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 H2O Perc Rate
10:44 11:14 6" 2.0 15.0
11:17 11:47 6" 2.0 15.0
11:54 12:24 6" 2.0 15.0
AVERAGE PERC. RATE 15.0 MPI
Percolation Test Data Sheet
Lic.#810
Percolation test readings made by: Rusty Olson's Perc. starting at 10:35 A.M. On 09/20/05
Location: Proposed Lot 6, Block 1 1745 Fox Street
Hole number: 3
Date hole was prepared: 09/19/05
Depth of hole bottom_12"_inches, Diameter of hole_6" inches.
Soil data from test hole:
Depth, inches Soil texture
0-8" Dark brown sandy loam 10yr3/2
8"-12" Brown loam 10yr414
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date and hour of initial water filling 09/19/05 At 10:30 A.M. 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
I Time Time Depth Drop in H2O Perc Rate
10:42 11:12 6" 3.0 10.0
11:19 11:49 6" 2.8 10.7
11:52 12:22 6" 2.8 10.7
AVERAGE PERC. RATE 10.4 MPI
Percolation Test Data Sheet
Lic.#810
Percolation test readings made by: Rusty Olson's Perc. starting at 10:35 A.M. On 09/20/05
Location: Proposed Lot 6, Block 1 1745 Fox Street
Hole number: 4
Date hole was prepared: 09/19/05
Depth of hole bottom_12"_inches, Diameter of hole_6"_inches.
Soil data from test hole:
Depth, inches Soil texture
0-8" Dark brown sandy loam 10yr3/2
8"-12" Brown loam 10yr4/4
Method of scratching side wall: Knife
Depth of gravel in bottom of hole 2 inches:
Date and hour of initial water filling 09/19/05 At 10:30 A.M. 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
I Time Time Depth Drop in H2O Perc Rate
10:41 11:11 6" 2.5 12.0
11:20 11:50 6" 2.5 12.0
11:51 12:21 6" 2.5 12.0
AVERAGE PERC. RATE 12.0 MPI