HomeMy WebLinkAbout1983-07-29 Septic System Design Reportt T...
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..SITE EVALUATION REPORT
FOR DAVID RYERSE
350 S. BROWN ROAD
7-29-83
On Jxoly 23-26, 1983 two percolation holes were tested and two aoil
borings were taken on the above property according to the provisions of
Individual Sewage Treatment Systems Standards ( WPC-40) in order to find
another area for a new drainfield. The area chosen was on a flat slope at
the base of a bank which is at least 75 feet back from the marsh and at
an elevation of about 4 feet above the swamp or marsh.
The soils were fairly sandy and had very good permeability which
■would require a shallow trench system because of the possibility of a •
high water table. However, in order to maintain at least 3 feet of i > .
separation between the bottom of the trench and the water table, some
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loanQT sand or sandy loan fill will be needed to be placed before
construction of the trenches. Also, grading should be done
in order to divert runoff water from entering the runoff
site. Sinc'e the water level in the borings is the same as
that of the marsh, an interceptor drain will not be necessary
with the systeri.
Additional system design ir.formation follows. If any
other infirroajion is needed, please contact me.
Sincerely,
FERCOR, INC.
/
Mark S. Gronberg, P.E.
<1
David Ryerse
System Design
1. Percolation Rate, Type of System.
10.7 minutes per inch. Shallow Trench System.
2. Proposed Flow Rate.
5 bedrooms ^ 150 OPD is ?50 GPD.
3. Soil Treatment Area required.
1.27 percolation factor x 750 GPD is 950 So., Ft. Minimum.
4. Size end Number of Trenches.
3 trenches 3 feet wide and I06 feet long is 950 Sq. Ft.
If it is determined that the present trenches are still
suitable but Just not enough sq. ft., then that area
could be subtracted. The new trenches would be spaced
a minimum of 7.5 feet apart center to center.
5. Drainfield Rock Required.
35 cubic yds. of rock is needed in order to have 6 inches
under and 2 inches over the 4 inch diameter distribution
pipe. Also* at least 6 inches of sandy loam or loamy sand
fill will be required to be placed before trench construe
tlcn. The original should be scarified before placing the
fill* and the fill should extend at least 10 feet outside
the edge of the trenches.
6. Septic Tanks.
The present tanks should be checked to see if they are
acceptable. If not, 2 tanks of at least 1000 gallons are
needed. Gravity flow should be possible to the site.
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DAVID HYERSE
350 S. BROWN RD.
Percolation Results
Hole No.Katerial
P-1
P-2
Brown Sandy LoPin
Brown Sandy Loam
The average percolation rate is 10.7 minutes per inch.
percolation Rate
8.1 Hin./Inch
13.3 "
Soil Borinss
s ^ « 1rteomn,)Katerial
0.0-1.3
-1.3-4.0
4.0-6.0
Black Sandy Loam
"Brown"Sandy “Loam
Gray Brown Sandy Clay
Mottled soil at 3*5 feet and water table at 4*8 feet after 24 hrs.
S.B. # 2IKfri.)CeF Material
0.0-1.5 1.1-3.8 3.8-6.0
Black Sandy Loam
Brown Sandy Loam
Gray Broan Sandy Clay
Mottled soil at 3*5 feet and water table at 3*9 feet after 24 hrs.
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