HomeMy WebLinkAbout1980-11-25 Septic System Design ReportCITY OF ORONO E Cory
SEPTIC SYSTEM DESIGN
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K APPROVED
APPROVED WITH CORRECTIONS
DISAPPROVED
Address Ln.f J0, / LAA . Z3i�' ��t//.�-� Z-4,t jFy,
Builder/Contractor P-eDrieZ n 1ktnC%
Comments:
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Date Septic Sy m Inspector
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PROTECT DRAINFIELD AREA
DESIGNATED DRAINFIELD SITES SHALL BE STA.
KED OFF PRIOR TO CONSTRUCTIOtV OR EXCAVA-
TION IN THE AREA. THE ORAINFI
ELO AREA SNALi:. REMAIN UNDISTRUFEU L!N7IL DRA!Nd iEI_D CON-
STRUCTION IS CG,�%,N�9E•'�;CE7. NO VE'-''^ULAR
TRAFFIC 09 S T 0Ci'PILIN'i; "
ALLO!'JtD WITHIN CESiC,,: d' FILL S! IALL eE
'` �'U DnAINIFiELD AI?cA
EITHER BEFORE OR AFTER D,RAINIFIELD INSTAL_
LATION. VIOLATION MAY REQUIRE
OF THE SOIL
KEEP OFF DRAINFIELD ARE: t;
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390 0o N. B9'4-¢'41 E.
Proposed Top of Foundation Elevation = 158.0
Proposed Garage Floor Elevation = 157.5
Proposed Lowest Floor Elevation = 150.0
I hereby certify that this is a true and correct representation of a
survey of the boundaries of:
Lot 10, Bloch 1, THE NURSERY, Hennepin County, Minnesota.
And of the location of all buildings, if any, thereon, and all visible
encroachments, if any, from or on said land. As surveyed by me this 11th
day of November, 1980.
Thomcs S. Bergquist
Land Surveyor, Minn. Reg. 7725 1
SCALE
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FO Prepared for:
SATHRE-BERGOUIST, INC. EwA AC
2�64 REGFIELU HC'ES
E]lIA.TWAfIATAaV% • WAIZArA MN »3,1 IIEh_
TI\IP10040 61. ATL Clfi%r• n
SITE YVALUATION REPORT
FOR REDFI-MD HOM 3S 7S "�`�'�►�-
LOT 10, THS NURSERY
9-10-80
On September 6, 1980 six percolation holes Were tested and three
soil borings taken, the primary site was comprised of holes 1-4 Which
were located -west of the proposed house. Holes 5 and 6 were in the al-
ternate site on the south side if the lot. All the percolation holes
were dug 6 inches in diameter to a 42 inch depth while the soil bor-
ings were dug 6 inches in diameter to the 4 foot depth and 3 inches
In diameter to the remaining depth. All holes were dug with bucket
type band augers,
Water was kept in the holes the night prior to testing after
which the holes were tested in �j hour intervals for 4-.-hours. The av-
erage percolation rate for the primary site was 16.6 minutes per inch.
which would be acceptable for a standard drainfield system. However,
with a high water table in wet seasons possible in this area, the
trenches should be kept fairly shallow. Very good material was en-
countered on the alternate site which could aeowt a standard system
a2ss.
Beeausse-the primary site should be no nearer than 75 feet to the
small low area to the weet., and iha elevation drop it about 7 feet from
the top of the hill to the drainfield area, the hovsw might have to
be rafaUd slightly to obtain a walkout to the. drainfield sftbe-this
area (dsainfteld 21#4 can not be graded.
Additional design information follows. Lf any questions arise or
other information is needed, please contact me.
sincerely,
?3RCOR, INC.
A1
Mark 3, Gronberg, P.B.
i
• R sDFI3LD HOMES
LOT 10, TH3 NIIRSEW
Percolation Results
Hole No.
Material
P-1
Brown
Clay Loam
P-2
Brown
Loam
P-3
Brown
Silty Loam
P-4
Brown
Silty Loam
P-5
Brown
Gravelly Loam
P-6
Brown
Gravelly Loan
Percolation Rats_
20.0 Min./inoh
12.0
16.0
18.5
7.7
20.0
The average percolation rate for holes 1-4 is 16.6 Min./inch.
s..oll Bo r,Inx&
d� H�
Devth(ft. )
Material
0.0-0.5
Dark Brown Clay Loam
0.5-4.0
Brown Clay Loan
5.0-8.0
Gray Brown Silty Loam
Mottled soil at 1.11 feet and no wateiti table alter 24 hours.
wnth(ft. )
0.0-3.6
3.8-4.2
4.. 2-4.6
4.8-8.0
Uteri
Brown Clay Loan
Brown Silty Loam
Brown Salty Loan
Gray Brown Clay Loam
Mottled soil at 5.3 feet and no water table after 24 hours.
S.B.
Dewtb_ Materill
0.0-0.7 Black Loan
0.7-1.2 Brown Loan
1.2-2.0 Coarse Sandy Clay Loan
2.0-3.0 Coarse Sandy Lem
3.0-4.0 Gravelly Loam
4..-6.5 Medium sand
6.5-8.0 Sandy Loam
NO mottled soil or water table after 24 hours.
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SYST-�Y, DRSIGN
1. Percolation Rate, Type, of System
16.6 minutes per inch. Standard system with trenches no deeper
than 2-2,5 feet,
2. Proposed Flow Rate
4 bedroom house = 600 gallons per day(GPD),
3- Soil Treatment Area Required
For a percolation rate from 16-30 NPI a factor of 1.67 times the
flow rate a 1000 sg.ft, of area is required.
!�. 31" juA Humber of Trenohes
Five trenches 2 feet wide and 100 feet long would yield 1000 sq.ft.
Two foot wide trenches should be spaced 6.5 feet minimwe venter to
center.
5. Filter Needed
55.6 cub+, yards of rook is needed for 1000 sq.ft, of drainfield
with 12 1es or rock below and 2 inehes over a 4 inch pipe.
6. septic Ys
Two 1000 gallon septic tanks are recommended,
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