HomeMy WebLinkAbout1983-02-21 Septic System Design Report•--
SYSTEM DESIGN
FOR MCNULTY CONST.
LOT 1, BLCCK 1
HI ACRES 7.10
2-21-83
1. Percolation Rate. Type_of System.
21.5 Minutes per Inch. Standard System.
2. Proposed Flow Rate.
4 bedrooms Cr- 150 G.P.D. is 60C. G.F.D.
3. Soil Treatment Area Required.
1.67 percolation factor x 600 G.Y.D. is 1000 so. ft. min.
4..Size .-.d Number of Trenches.
Three trenches with a total length of 333 f t. x 3 feet wide
is 1000 sq. f t. These trenches should be spaced a minimum of
7.5 f t. center to center, and should be 2-3 feet deep in the
natural soil.
5. Drainfield Rock Required.
55.6 cu. yds. of rock is needed to have 12 inches under and
2 inches over a 4 inch distribution pipe.
6. Septic Tanks.
2 septic tanks each c at least 1000 gallon capacity are
required. In addition, if the house is kept at the proposrd
elevation, it will be necessary to have a third pumping
tank and pump in order to reach the higher drainfield Brea.
Distribution to the trenches should he by the use of drop
boxes
Sincerely,
PERCCR, INC.
Mark S. Gronberg. P.E.
r
�
r SITE EVALUATION REPORT i
FOR THE EDGAR HERTZ PROPERTY
_.- 1820 FOX STREET, ORONO
5-31-80
On May 17, 1980 Rix percolation holes were tested and
s
three soil borings taken. The percolation holes were dug 6
inches in diameter to a 42 inch depth. The soil borings were
dug 6 inches in diameter to the 4 foot depth and 3 inches in
diameter to the remaining depth by hand augers.
The average percolation rate for the tour holes in the
primary drainfield site was 21.5 minutes per inch. This rate,
along with the lack of a high water table woula enable this
site to meet the requirements for a standard drainfield. There
ie a topographical problem which will require the trenches to
be constructed In a v-shape in order to remain relatively level
for the entire length of the trench.
The alternate site also meets the requirements for a stan-
dard drainfield system. However, this area is higher than the
probable building site 3o a T;uT^ .would rro3t likely nrcc to b
used in this situation.
More information concerning the design of the system will
•
be needed once the size and location of the house are known.If
there are any questions or additional informatioA!.needed, plea:-e
contact me.
Sincerely,
PERCOR, INC.
Mark S. Gronberg, P.E.-I
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407' i, BGoC
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INLET
TRENCH CONSTRUCTION DETAILS
PIPE TO NEXT DROP BOX c4 DIAMETER INSPECTION
L .1 �„ WELL WITH CAP
DROP BOX
EARTH BACKFILL AT LEAST 4 TO 6 INCH LAYER OF 'C
6" ABOVE TOP OF ROCK MARSH HAY OR STRAW AND
LAYER OF Rci) ROSIN����
n� Mn,TITInni Moc PAPER
AT LEAST 12" DEPTH OF CLEAN
ROCK 3/4" TO 2 '/2" DIA.
V.•
MAXIMUM LENGTH r 100 FEET
OVERFILL
TO 6
NOTES:
I. BOTTOM OF TRENCH MUST BE FLAT ALONG
�4 INCHES
LENGTH.
INSPECTION
.
__ _ _
i
~ WELL
2• SLOPE ON DISTRIBUTION PIPE IS BETWEEN
LEVEL AND 4 INCHES PER 100 FEET.
y�
BACKFILL
RECOMMENDED SLOPE IS I TO 2 INCHES PER
6�� TO 12" OF
100 FEET.
o
SOIL BACKFILL
3. DISTRIBUTION PIPE CAN BE PERFORATED
°
--��.
PLASTIC WITH I/p INCH OR LARGER HOLES.
°
�2" DEPTH OF
ONE OF THE ROWS OF HOLES MUST BE
LOCATED ALONG THE BOTTOM OF THE PIPE.
ROCK ABOVE
PIPE
ONE -FOOT AGRICULTURAL DRAIN TILE CAN
ROCK
°
BE USED WITH A 1/4 INCH SPACING.
°
AT LEAST 12" OF
o
ROCK BELOW
4. SCARIFY TRENCH BOTTOM AND SIDEWALLS
PIPE
AS HIGH AS ROCK WILL BE PLACED IN THE
TRENCH IN ORDER TO EXPOSE NATURAL SOIL.
TO 35"
REMOVE LOOSE SOIL BEFORE PLACING ROCK.
v
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• PERCOLATION TEST SHEET -
Test hole location I I r?' s CBole # f Date test hole was prepared:
Depth of hole bottom: t t' Inches Diameter of hole: -�- Inches
Soil Data from test holes
depth, inches
soil texture:
soil color
Method of scratching sidewalk b��' �.� Depth of pea size Ravel in bottom of hole: Z inches
Date and hour of initial water filling: %'b ' " Depth of initial water filling; above hole bottom
Method used to maintain 1=' of water depth in !tole for d hours:, : •;
Percolation test conducted byt ^e �, :- '�•`' Percolation test started at :
Mauimuat water depti► above hole bottom during'`--s& ._-- inches
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Certificate of Survey
for Ugar T. YArtz
of Lot ;,, Block 1, Ualdron Kcditlor.
Har,repin Cowity, Minneant:l
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