HomeMy WebLinkAbout1980-11-29 Septic System Design Report5
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LOT 2, BLOCK 1
FAI WAY VI TJ
System Design
1. Percolation RatP, Type of System
25.3 minutes per inch(YS I) for the primary site.
Standard Drainfield System.
2. Pronosed Flow Rate
3 bedrooms C' 150 gallons per day(GPD) per bedroom = 450 GPD.
3. Soil Treatment Area Required
For a percolation rate betwe,3n 16-10 MPI a factor of 1,67 is used.
4�0 GPD x 1.67 = 750 sq.ft. of treatment area minimum.
4. Size and Number of 'Trenches
4 trenches 2.5 feet wide and 75 feet long would yield 750 sq.ft.
of soil treatment area. Trenches 2.5 feet wide would be spaced a
minimum of 7 feit center to center.
5. Drainfield Rock Required
For 750 sq.ft. of drainfiel.d and 12 inches of rock below and 2
inches of rock over a 4 inch distribution pipe 41.7 cubic yards
of rock or 5&.4 this are needed.
6. Sentic Tanks
Two septic tan:s each of 1000 gallon capacity are to be used with
the drainfield system.
LOT' i BLOCK 1
FAIRWAY VIEW
Percolation Results
Hole No.
Material
P-1
Brown Clay Loam
P-2
Yellow Brown Loam
P-3
Yellow Brown Loan
P-4
Brn. Loam w, rocks
r->
Brown Loam
P-6
ulive Brn. Loam
Percolation Rate
40.0 Min./inch
17.1
20.0
24.1
1y,0
12.0
The average percolation rate for the primary site(holes 1-4) = 25,3 MIT
The average percolation rate for the alternate site(holes 5-6) = 13,5
Soil Borings
S.B. ' 1
Depth(ft. ) I'saterial
0.0-0.6 Black Loam
0,6-1.0 3rown Loam
1.0-2.0 Red Brn. Sandy Clay Loam
2.0-4.0 Brn, Sandy Clay Loam
4.0-8.0 Brown play Foam
No mottled soil or water table after 24 hours.
S.B. rl 2
Denth(ft. ) I-faterial
0.)-0.5 Black Loam
0.5-1.5 Drn. Sandy Clay Loam
1.5-2.0 Red Brn, Sandy Loam
2.0-3.0 Brn. .,andy Clay Loam
3.0-5.0 Yellow Brn. Sandy Loam
�.0-8.0 Yellow Brn. Sandy Clay Loam
No mottled soil or water table after �A hours.
B c
,)ernth(ft. ) Material.
0.0-0.8 Black 1 oam 3. '- I.0 iU, Brn. Loam
��, n:
).6-1.5 Grey Black l.otu7 o-0. 0 Grey Brn. Clay Loa
1. -3.10 Groy - . C?.a,, I oair.
Notcled soil. at 4.0 fcet and dater table at 6.6 ft. after. 24 i,oiir:=.
SITE iWALUATION MFORT
LOT 2, BLOCK i
7AIRdAY VIT:1
11-29-80
On November 27-29, 1980 six percolation. noles were tested and
three soil borings taken on the above lot to uetermine the suita-
bility for both a pr;mary and alternate drainfield site.
The percolation holes were dixg 6 inches in diameter and 36
inches deep with bucket type hand augers. The digging was diffi-
cult since many small rocks were encountered at the one and a half
foot depth. The soil borings were dug,6 inches in diameter to the
L foot depth and a diameter to the 6 foot depth, also
with bucket type har,' _ _)rs.
This lot is loca', ainly in the Hayden Loam soil series and
yielded an average perec- ation rate of 5.3 minutes per inch for
the primary* drainfield site. In addition, no indication of a high
water table existed so a standard drainfield system could be con-
structed. The alternate cite wRs situated on a saddle between two
low areas and yielded a better percolation rate but because of the
possibility of a high water table at certain times, a shallo•.a
trerich system mould need to be used here should the need ever a-
rise. The::e trenches would be constructed about a foot deem in the
natural soil with some fill beinr, placed over the top.
Because there is such a small area that is available for both
a building site and a drainfield it will be somewhat tight placing
the house on i;iie lot, but enough room should exist for a 'Liuuse of
n rnal width to be constructed. Additional design information fol-
lows in this report. O"hould any other information be needed, please
co„tact me.
Sincerely,
PERCOR, INC.
nark % Gronberg, P.E.