HomeMy WebLinkAbout1983-08-05 Septic System Design ReportCITY OF ORONOC
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GENERAL CONTRACTOR CutZ7 L,)DE )li�SoIIJ
SEPTIC CONTRACTOR
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APPROVED S Hutto w 't12.tyV c�tl�i
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DATE APPROVED
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CURT ANDERSCN
LCT 2, BLCCK i
COUNTRYSIDE KLNCR
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Cn July 29-31, 19':� 3 four F e rcol-.trop; toles were tested and
two soil borings taker.' on t' -:L I.r)C)VC- let -ccc•rding to the provision
of Individual Sewage T re �-t:',cnt Sys te.:,s Stand i.rds (WFC -4c) . Tne
area wa.- tested in the nort': :.cSt cc-r!ier of tl.Ec lot to be u. cd as a
priru.r; site since an tc t::E west tested previously tested
by others and determined tc need a mound sl•ste^.. This other site-
would
itewould now be u.Qed as an Lltern&te site.
We encountered sandier =oils or s. --.all rilge but as soon as
we drilled farther west heavy clsy soils were encountered with
high water tables. Thus, the trenches will need to be kept short in
length to stay on this ridge. They will also have to be fairly
shallow with an interceptor drain and swale constructed around the
upper side of the drainfield in order to divert runoff water from
the site.
The se; tic tanks at,; ecr to be in tend a third pumping tank, if
not already installed, will be needed to reach the higher drainfield
ares.. ?.dditicn l syE torr. design inforrr.Ltion follows. if a:.;- other in-
for..ation is nee3ed, r,Iea.se con';.ct me.
Sincerely,
FERCCR, EX.
;:irk S. Gronberg, F.E.
CURT ANDER30N
LOT 29 BLOCK 1
CC: NTRYSIDE MA" ; OR
Fercolation Results
Hole No. Faterial
F-1 Dark Brown Sandy Loarr,
c-2 Gray Brown Clayey Sand
r-3 Brown LoaTry Sand
F-4 Brown C 14y Loam
The average percolation rote is _.1 ninuteE per inch.
S.B. ':1
ep ft. )
0.0-0.5
0.5-2.3
2.3-3.r)
3.0-7.0
7.0 -`?.0
Soil ;-oringc
I•:r.teri-,l
Rlbck Loam
Dark Broken Clcy Loam,
Dark 3rown Clayey Sand
Brown Loamy Sand
Brown Coarse Sand
Fercolation. Rate
3.6 Pain. /Inch
3.2 "
3.8 n
X1.6
No mottled soil or water table after 24 hours but moist at 7.0 feet.
S. B. #2
ep i ft.)
Faterial
0.0-0.7
Black Loan.
0.7-2.0
Dark Brown
Clay Loam
2.0-2.5
Dark Brown
Sandy Loam
C-5-7-0
Brown Loany
.2jund
7.0-8.0
Gray Brown
Ssndy Clay
Mottled soil at 7.0 feet and water table at 7.0 feet after 24 hours.
LCT 2, RLOCF 1
COUNTRYSIDE Ifl:NOR
Sy:tEn ;fv ign
1.-ei,cc,2F.tion Rate. o: Systen.
.1 minutes I er Inch. S.',.Alow Trench SystE:r..
c . pr;"Ose:l ICi+ R, tE P�
475"0
coy,'I D. ' �.0 �C.tc ..a rc .` EEt 1I._.. ,...
is tr%::C:7£S :�� ii&'u ;�'" j �f•Ci Y'i;.C: _: 4" IL src:::-rE ft,Ct.
ld L V 1 r to ce..ter s:.3 be no
T:,cse wo- e:i i .; _ c�r.L�..
dee-;e^ tc 1. _^f ct d I. in, tiiE nataral soil.
K. Drainfield Rock cc;. rea.
cubic yards of reek is needed to have 12 inches under and
Sc inches over a 4 inch diametet distribution piye.
b. Septic T a:fe.s.
Twc tanks are already in plus r. third ;. ur.ping tank with punp and
alarn, device are necessary.
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DIVERSION FOR
SURFACE WATER
GRASS COVER
.i
12"-18" LOA'
SOIL BACKFILL OVER AREA
6"!
1 i2 DRAINFIELD
k TRENCHES
AT LEAST 16 J I
1 AT LEAST 4 V2' ORIGINAL
`i INTERCEPTOR OR GROUN O
_CURTAIN DRAIN TO SURFACE
REMOVE EXCESS
SOIL V ATER--
SOIL TREATMENT UNIT USING SHALLOW
TRENCHES AND CURTAIN DRAIN
T
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CITY OF
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SEPTIC SYSTE91 APPROVAL ra
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LOCATION _T , ,�' c�,� �,�N,~►eiS�AE ��A,Ua�e __
GENERAL CONTRACTOR ��/�-hSZjE1Cs
SEPTIC CONTRACTOR
OWNER
APPROVED �� r'
APPROVED
4iiNGF.SBELOW
COMPSENTS -
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DATE
DATE APPROVED BY: 110/
PROTECT DRAINFIELD AREA
DESIGNATED DRAINFIELD SITES SHALL BE STA-
KES OFF I'MOR TO CONSTRUCTION CR EXCA\'•`
TION IN THE AREA. THE DRAINFIELD
REMAIN UNDISTRUBED Ui•JTIL DRAINFIELD CfJN-
STRUCTION IS COMMENCED. NO VEHICU!.A!-,
TRAFFIC OR STOCKPILINIG OF FILL SHALL ' i
ALLOWED WITHIN DES",GNATED DRAINFIELD r -A
EITHER BEFORE Ofi AFTER DRAINFIELDE-
I.ATION. VIOLATION MAY REQUIRE RLI S
Of THE SOIL.
KEEP OFF DRAINFIELD ARE.'
P.O. Box 209
Wayzata, MN 55391
November 10, 1982
Mr. Curtis Anderson
6016 Beachwood Road
Mound, MN 55364
Dear Mr. Anderson:
We have enclosed a plan and detail drawing for the
construction of a "mound" type sewage treatment system
for Lot 2, Block 1, Councrvside Manor in Orono, Minnesota.
The details of construction are specified by the City
of Orono and are shown in the current "Orono Mound Package"
and the "On-site Sewage Treatment System Design Manual"
adopted 4-13-78 by the City of Orono.
If you have any questions, please call me.
Yours very truly,
Car: W. Borg, P.E.
Minnesota Reg. No. 7560
CWB:pb
cc: Michael Caffron
City of Orono
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EXH13!T h-��
TO: Jeanne A. Mabusth, Zoning Administrator
FROM: Michael P. Gaffron, Septic System Inspector
DATE: November 6, 1981
SUBJECT: #654 Dicon, Willow Drive South - Subdivision
I have reviewed the submitted report for the above referenced
proposed subdivision, and wish to make the following comments:
The report by Borg indicates high -water -table soils throughout
the 6 lots tested.
Lot 1 - Slopes of 8%, iui. Percolation rates at a depth of
25" - 31" averaged 10 mpi in the primary site and 23 mpi
for the alternate site. Both sites are acceptable for
standard mound systems.
Lot 2 - Slopes of 4-68 in areas tested. PG-colation rates
averaged 25 mpi in the primary site and 1? in the alternate
site. Both sites are acceptable for stane -.nound systems.
Lot 3 - Slopes of 58 - 6% in areas tested. Average percolation .
rates averaged 27 mpi for the primary site, and 34 mpi in the
alternate site. Both sites are acceptable for standard mound systems.
Lot 4 - Slopes of 3-4% in areas tested. Percolation rates
averaged 41 mpi in primary site and 20 mpi in the alternate
site. Both sites are acceptable for stanuard mound„y,y� Pma
Lot 11 - Slopes of 8-10% in areas tested percolation rates
and 31 mpi at the alternate
site. NOTE: CARE MUST BE TAKEN TO PLACE THE MOUND O
SLOPE OF 68 OR LESS ON THIS LOT. L 11 `140400t -p
Lot 10 - Slopes average 6%. Percolation rates averaged 48 mpi L'f 2
on the primary site and 87 mpi on the alternate site. BtpeK
General Comments: Percolation testing was done at a range of
depths from 13" to 31". N(, real correlation appears to exist
between depth of testing and percolation rates. The soil
borings reflect a seasonably saturated zone beginning at a
a range of depths trom 1.2 ft to 2.5 ft. Actual current
perched water tables were found on some sites at a depth
of 3.5 ft. or greater.
Based on the above data, the site evaluations recommend tion
for all mound systems is appropriate. I confirmed the soil
boring report with a '-)ring of my own.
0 -
Two additional comments are necessary:
1 - Enough sand should be placed above the surface soil
to maintain a 3' separation between the shallowest mottled
zone and the bottom of the rock bed in the mound. On some
sites this will mean 2' of sand should be placed.
2 - In all ••ases, mound placement should be at the most
level spot available in the natural topography in the
area tested.
I recommend approval of the subdivision, with the further
stipulation that during road construction the drainfield
sites remain totally undisturbed.
EXHITT
TO: Jeanne A. aMabusth, Zoninq Administrator
FROM: Michael 1'. Gaffron, Septic System Inspector
DATE: November 6, 1981
SUBJECT: #654 Dicon, Willow Drive South - Subdivision
I have reviewed the submitted report for the above referenced
proposed subdivision, and wish to make the following comments:
The report by Borg in -'i --!--s high -water -table soils throughout
the 6 lots tested.
Lot 1 - Slopes of 8%, 10�. Percolation rates at a depth of
25" - 31" averaged 10 mpi in the primary site and 23 mpi
for the alternate site. Both sites are acceptable for
standard mound systems.
Lot 2 - Slopes of 4-68 in areas tested. elation rates
averaged 25 mpi in the primary site and 1 -i in the alternate
site. Both sites are acceptable for stanaird mound systems.
Lot 3 - Slopes of 5% - 6% in areas tested. Average percolation
rates averaged 27 -mpi for the primary site, and 34 mpi in the
alternate site. Both sites are acceptable for standard mound systems.
Lot 4 - Slopes of 3-4% in areas tested. Percolation rates
averaged 41 mpi in primary site and 20 mpi in the alternate
site. Both sites are acceptable for stanuard mound-systema-
Lot
oundsvG*ema_Lot 11 - Slopes of 8-10% in areas tested percolation rates
and 31m i at the alternate
site. NOTE: CARE MUST BE TAKEN TO PLAC—E--T-TIED ON
SLOPE OF 6% OR LESS ON THIS LOT.Lo_..- I I
Lot 10 - Slopes average 6%. Percolation rates averaged 48 mpi
on the primary site and 87 mpi on the alternate site. B(.ptK
General Comments: Percolation testing was done at a range of
depths from 13" to 31". No real correlation appears to exist
between depth of testing and percolation rates. The soil
borings refle:t a seasonably saturated zone beginning at a
a range of depths from 1.2 ft to 2.5 ft. Actual current
perched water tables were found on some sites at a depth
of 3.5 ft. or greater.
Based on the above da`a, the site evaluations recommendation
for all mound systems is appropriate. I confirmed the soil
boring report with a boring of my own.
Two additional comments are necessary:
1 - Enough sand should be placed above the surface soil
to maintain a 3' separation between the shallowest mottled
zone and the bottom of the rock bed in the mound. On some
sites this will mean 2' of sand should be placed.
2 - In all ases, mound placement should be at the most
level spot available in the natural topography in the
area tested.
I recommend approval of the subdivision, with the further
stipulation that during road construction the drainfield
sites remain totally undisturbed.
TO: Jeanne A. Mabusth, Zoning Administrator
FROM: Michael P. Gaf:ron, Septic System Inspector
DATE: June 14, 1982
SUBJECT: #654 Dicon, 155 Willow Drive South - Additional On -Site
Testing
I have reviewed the submitted soil and site evaluation for the
two lots on the north side of the road in Phase 1. Testing
indicates average perc rates varying from 1 to 48 mpi, with
high water tables (saturated zones) in all but the most northeasterly
site. Mound systems are applicable for all these sites, although
the northern site for Lot 1, Block 1, could support a shallow
trench system. _ _.._..-
I note that Lots 2, 3 and 4 in Block 2, have been realigned.
By superimposing the previous testing over the new lot lines, it
is apparent that 2 of the 6 perc tests originally done on Lot 4
are now on Lot 3. Technically, additional testing should be done
within the boundaries of the revised Lot 4. However, since the
soils appear to be fairly consistent throughout the division, and
since mounds will be used on all the lots, this minor additional
testing is not critical and may be waived until a house is proposed
for the site.
I will reiterate that mounds should be placed on the most level
sites within the tested areas; and that prior to road construction,
all drainfield sites should be staked off to eliminate traffic
or disturbance.
JuneAl, 1981
Bo
ox
Wayz, MN 55391
A
d
Mr. Richard Conry
21350 Exclesior Boulevard
Excelsior, rinnesota 55331
Dear Mr. Conry:
We have completed a site evaluation for on-site sewage treatment facilities
on 6 lots located west of Willow Road in Orono, Minnesota. A location map has
been enclosed showing the location of Ll�e percolation tests, percolation data,
location of soil borings and relative elevations of the surface at the location
of the percolation tests. (For detailed contours please see topography prepared
by Gary Gabriel). A loo of the soil borings is also enclosed.
The soil borings reflect a uniformly high water table throughout the area
tested. 7;iis condition prohibits the installation of conventional soil absorption
systems and shallow trench systems. The percolation rates encountered and the
gentle slopes on this site would indicate that mound systems should be satisfactory
on each of these lots. We recorunend that the future homes be provided with mound
systems of soil absorption.
Please call if you have any questions.
Thank you.
ORONO
Yours very o uly,1
Carl W. Borg, P.E. �—
.maw
sAw
Box 209
Wayzata, MN 55391
June 8, 1982
Mr. Richard Conry
21350 Excelsior Blvd.
Excelsior, MN 55331
Dear Mr. Conry:
Due to the lot re -arrangement on "Rolling Acres", some
additional site evaluation was required.
This has now been completed and the test results and the
locatien drawing A*_ pr....; _.....,..<.....�.....r...�"\
! The high water table encountered would indicate a mound
system for the westerly lot in either the primary or alter-
nate location. Tests on the north end of the easterly lot
indicate that a shallow trench (alternative system) may work
ease call if you have any questions.
Yours very tru
Q -14-V ,
Carl W. Borg r
CWB:jj
Enclosure
CC: Michael Gaffron
City of Orono
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