HomeMy WebLinkAbout198-04-11 Septic System Design Report%v/r JAEi�rNQ,��►t
F-15
PUMP SELECTION PROCEDURE
A. Determine pump capacity:
1. Minimum suggested is 600 gallons per hour (10 gpm) -
to stay ahead of water use rate
2. Maximum suggested for delivery to a drop box of a home
system is 2700 gallons per hour (45 rpm) to prevent
buildup of pressure in drop box
3. Use value fro.: desig- of pressure distribution system
SELECTED PUMP CAPACITY . . . . . . . . . . . . . . . . _ 1 60 6 gpm
Determine head requirements:
1.
Elevation difference betwP2-a pump and point of discharge
�0 feet
2.
_
If pumping to a pressure distribution system, add 5 feet
_f
for pressure required at manifold . . . . . . . . . .
S feet
3.
Friction loss --"
-'-"—
a. Enter friction losq table with gpm and pipe diameter.
Read friction loss �:t feet per 1n0 feet from page F-18.
F. L. _ �/. J3 ft/100 ft
b. Determine total pipe length from pump to discharge
point. Add 25 percent to pipe length for fitting
loss, or use a fitting; loss chart. Equivalent pipe
length = 1.25 times pipe length = .1.2.5 x , ' =
?06 t feet
_
C. Calculate total friction loss by multiplying;
friction loss 1n ft/100 ft by equivalent pine
length.
Total friction loss = 5/ U3�1rnx ZO(J t
/_� feet
4.
_�'.
Total head required is the sum of elevation difference.
special head requirements, and total friction loss.
IO F + S + ��t
TOTAL HEAD . . . . . . . . . . . . . . . . . . . . . .
24 / * feet
C. Pump selection
1.
A pump must be selected to deliver at least Z C. c gpm
with at least Z 3 �f feet of total head.
D. To
maximize pump life select sump size for 4 to 5 pump
operations per day.
1?. Calculate drainback
1. Determine total pipe length, feet.
2. Determine liquid volume of pipe, _ gallons per
100 feet. (See page E-18)
3. Multiply length by volume: Drainback quantity =
_ feet x gallons/100 ft = galluns
4. Suggested drainback quantity is 10 percent of pumped quantity.
A larger drainback percentage will decrease pump station
efficiency slightly but pumping enemy costs are usually a
relatively small part of the total household energy costs.
E-19
MOUND DESIGN PROCEDURE
(For Flows up to 1200 gpd)
A. Sewage Flow Rate
See D-7 or I-3, 4, or 5, or use
metered value; Flow Rate =
�15 0 gpd
B. Septic Tank Liquid Volume
(see C-3 or C-5) 12DO gallons
C. Soil Characteristics
1. Depth to restricting layer
such as seasonally saturated
soil, bedrock, coarse soil,
etc.; __inches
2. Depth of percolation tests;
/8 inches
3. Number of percolation test
holes; holes
4. Ave. percolation rate;
A. 2 mp i
5. Landslope Z %
D. Rock Layer Dimensions
1. Multiply gpd by 0.83 to
obtain required area of
rock layer;
1150 gpd x 0.83 Q-?73,5 sq f t
2. Select width of rock layer
(10 feet or less) = 10 feet
3. Length of rock layer o urea
Width 371.3sq f t= L f t
-77. 3.7 f t
E. Rock Volume
1. Multiply rock area by rock depth
to get cubic feet of rock;
177�_sq f c x $. 75 f t= 2FOcu f t
2. Divide cu ft by 27 cu ft/cu yd
to get cubic yards; A0. y
3. Multiply cubic yards by 1.4 to
get weight of rock in tons;
ZiLycu yds x 1.4 - IV. 5 tons
F. Pressure Distribution System
1. Select number of perforated
laterals 6
2. Select perforation spacing
3. Select perforated lateral
length; Note if manifold is
at end of rock layer, lateral
length is rock layer length
less half a perforation
spacing. If ,lanifold is in
center of rock layer, lateral
length is one-half rock layer
length less half a perforation
spacing. Perforated lateral
length - /Z. Z ft.
4. Divide lateral length by perfor-
ation spacing to get number of
perforations per lateral
LZ,Lfeet _ 3 feet - 6 perfs
Note: last perforation must be
in end cap, (see page E-14)
5. Multiply perforatio-iis per
lateral by number cf laterals
to get total number of
perforations;
__perfs/lat x _C:.ats - .?6
6. Determine required flow rate
by multiplying number of „
perforations b
p y flow per �•r Pia .�;
perforation (see page E-17)
' 6 perfs x .7Ygpm/perf =76`b gprn
7. Sheer -'nimum required lateral
diame rom table on Page E-17;
anter with perforation
spacing, ,,erforation diameter,
and number of perforations per
lateral. Select minimum
diameter for perforated lateral
_ lYet" inches I-rIF /Y7"
G. Basal Width
1. Percolation rate in top 12
inches of soil is J& 2 mpi
2. Select allowable soil loading
rate from table on page E-16;
oj-e 0. VS gpd/ft2
MOUND DESIGN PROCEDURE (Continued)
(Fir Flows up to 1200 gpd)
G.3. Calculate basal width ratio
by dividing rock layer
loading rate of 1.20 gpd/ft2
by allowable soil loading
rate;
1.20 gpd/f t2 - O SgPd/f t2 = j•�7
Check this value on page E-16.
4. Multiply basal width ratio by
rock layer width to get
required basal width;
'?.`1 x /o ft - 26.7ft
H. Downslope Dike Width
1.
If landslope is 3% or more,
subtract rock layer width
from basal width to obtain
minimum downslope dike toe width
ft - ft - ft
Calculate mound height at edge
of rock layer on downslope side;
a. Determine depth of clean sand
fill at upslope edge of rock
layer: feet
b. Multiply rock layer width by
landslope to determine drop
in elevation;
x % 100 - ft
c. Add drop in elevation to depth
of clean sand at upslope edge
of rock layer to get depth of
clean sand at downslope edge
of rock layer.
_ft + ft ft
d. `Add depth of clean sand at down -
slope edge to depth of rock
layer to depth of soil backfill
to get mound height at downslope
edge of rock layer;
ft + ft + ft ft
e. Enter table on page E-18 with
landslope and downslope dike
ratio. Select dike multiplier
of
E- 20
11.2.f. Multiply dike multiplier by
downslope mound height to get
downslope dike width;
x - ft
g. Compare the values of step 11.1
and step H.2.f. Select the
greater of the two values as
the downslope dike width;
feet
h. Calculate upslope dike width
using upslope mound height
and upslope dike multiplier
from page E-18; ft
'C -
i. Total mound width is the sum
of upslope dike width plus rock
layer width plus downslope dike
width;
ft + ft ft = ft
3. If landslope is 2 percent or
less, basal width includes both
the upslope and downslope dike
widths.
a. Calculate downslope dike width
using steps H.2.a. through
H.2.f; ; feet
b. Calculate upslope dike width Y.
using upslope mound height and
dike multiplier from Page E-18;
.? D X.747ft = .);5 ft
Add downslope dike width to
upslope dike width to rock
layer width to get total mound
width;
le!Zft +8_Sft + ID ft =2Y.7ft
d. Compare total mound width to
required basal width from step
G.4. If total mound width is
greater than required basal
width, use calculated dike
widths. If required basal
width is greater than total
mound width, increase downslope
dike width. `/lF 2f. 7
B-39
PERCOLATION TEST DATA SHEET
Test hole location hole number
Date test hole was prepared Depth of hole bottom, /.4' inches.
Diameter of hole. K inches.
Soil data from test hole:
Depth, inches Soil texture
lO -
Method of scratching sidewall Pble- SCra IC�g4`
Depth of pea -sized gravel in bottom of hole, inches.
Date and hour of initial water filling : ,,,. ; / •/1 - i .
Depth of initial water filling, /S inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours re- �; h; n ft
Percolation test readings made by ,66 6ol�z Oil
`/- /?- :' starting at /': a.m.�. Maximum water depth above hole bot:
(date)
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
1 �o
O
1.3a3
O
r1iir.
I 'j, C.
Z :D
D
'�i�
�i� ,
(o
2, A
3 0
43.E -
38
Percolation rate J. minutes per inch.
B-39
PERCOLATION TEST DATA SHEET
Test
hole
location
16,
Pr r V
Hole number Z
Date
test
hole was
prepared_
4 -11 7a
Depth of hole bottom,
Diameter of hole, (_ inches.
Soil data from test hole:
Depth, inches
0—/2
Soil texture
hack I-0m
Are, Qro�.....ti, Q_. L'�j
inches.
Method of scratching sidewall hol.t Se rn 4C �e,r
Depth of pea -sized gravel in bottom of hole, ]_ inches.
Date an: hour of initial water filling $:m A -Ai. y-/? -f _
Depth of initial water filling, /S inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours
Percolation test readings made by /FO6 4
4-12 - AS starting at ►.? .4c) a.m.
(date) CfP
�- during test, inches.
Oil
Maximum water depth above hole bottoin
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
/? : 40
4'r
:09
Z
/oi 4qi
5 �ii�
s
/:3 5
Os�
�0 1
4- 311E
7. Z
3ti
�
'�i e
4 sir U
7.4
,
7 6
3: 3q
30
q _
-3
Pert n rate a J'. minutes per inch.
B-39
PERCOLATION TEST DATA SHEET
Test hole location--r'vn y hole number
Date test hole was prepared Depth of hole bottom,_ incises.
Diameter of hole, (10_ inches.
Soil data from test hole:
Depth, inches
p- /o
Method of scratching sidewall
Soil texture
B/ecck /6-CWI
,8io'.W -7 L/C. b few
h 612 Sc.-O, r
Depth of pea -sized grav-1 in bottom of hole, _ oZ inches.
Date and hour of initial water filling _ ��U A V�i, 4 - 1 2 -89
Depth of initial water filling, % inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours re-��
PercolationQteest readings made by R0h Go f'Z on
4 - 11 "CJV a.m.
starting at JZ� � Z .m. Maximum water depth above hole bottom
(date)
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
9
' 14& S—
3 'ire
.
41
30
''/+
D
'%/ 4-'YA14/14
Ib o
4 I
0
7%
r.
30
/'i
/0 0
Percolation rate w /6'. C minutes per inch.
8-39
PERCOLATION TEST DATA SHEET
L Test hole location ::�i# / ee Hole number 4-
Date test hole was prepared 4 - I i- , Depth of hole bottom,_A�a inches.
Diameter of hole, (— inches.
Soil data from test hole:
Depth, inches
Soil
texture
/acok
Method of scratching sidewall _ �10� $C r -e,r-
Depth of pea -sized gravel in bottom of bole, 02 inches.
Date and hour of initial water filling _ E-6o A 4-/2-.$&
Depth of initial water filling, inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours r e- � ; 1 ; V.
Percolation test readings made by r< y!D l7e /�2
on
starting at 12,43 �� . Maximum water depth above hole bottorn
(date)
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
2 : 3
9
4 9
5/�b
Z. 2.�
30
S�//(o
/L
54.5
%�3
1.14
'�� �
4D:o
3•aZ
a
Percolation rate a (4,✓ . J minutes per inch.
E-39
PERCOLATION TEST DATA SHEET
Test hole location_ —r1j iy! /efrV dole number s
Date test hole was prepared 4-11- R , Depth of hole bottom,/8 inches.
Diameter of hole, ___(10— inches.
Soil data from test hole:
Depth, inches Soil texture
— D- b $(a.ck I oa
Method of scratching sidewall h 6i.t SC t n, �'G.h.a r
Depth of pea -sized gravel in bottom of hole, _o_c. inches.
Date and hour of initial water filling 8 'Qt:
Depth of initial water filling, /$ inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours t G Si (1 or
Percolation test readings made by 2 on
2 -8$ starting at /2 - A S a.m. Maximum water depth above hole bottom
(date)
during test, inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
24.9
1: 13
a
-Y/A
_
—
A 3
30
30
Percolation rate - 0 minutes per inch.
5-39
PERCOLATION TEST DATA SKEET
Test hole location / GA-77 7 'iorr -/ hole number
Date test hole was prepared_ 4--II- 68 Depth of hole bottom,_ inches.
Diameter of hole, _(6_ inches.
Soil data from test hole:
Depth, inches
Soil texture
tac-4L (Cr" w
4oa►�l. �?fc�.vl� C�.��i �Oe.-r�
Method of scratching .sidewall Ul e- S-aroAcl^e r
Depth of pea -sized gravel in bottom of hole, _�2 inches. C�
Date and hour of initial water filling 5:Oa 4. W 4
Depth of initial water filling, / -5 inches above hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least
4 hours r r �1' i I r c,
Percolation test readings made by _ _ I�ONu C
' 11 'tq8 starting at /Z .4 a.m. .
(date) <EP
�.. during test, inches.
a 11 L on
Maximum water depth above hole bottom
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inctic.,
Percolation
rate,
minutes per
inch
Remarks
/Zs4to
7 '57
/ 'i
a'/6 4'-Is
i.
2'14
0
4'01 -
Z "�•�
�1.2
Z'44
go
s//o, 3
35��s�
9 f
3: 14
36
34 4
3 p
IV6
12.3
Percolation rate / : minutes per inch.
Logs of Soil ilorings
'— 13-2 7
Location or Project -r
�� rr,/
Borings made by 1R0 6 /S51& Date _ 4,- - 9S_�
Classification System: AASHO ; USDA-SCS Unified ; other
.uger used (check two): hand ✓r Power _; F1ighE _, or l:ucket ✓; other T
Depth, Boring number
in Surface elevation
feet
0 —
81ac-� 1 oaw�
Browy\ C-6,t 104 KA
Lrouwh CI*&) 10a�-'
Klbi}i'ed
End of boring at 4 feet.
Standing water table:.
Resent at feet of depth,
hours after boring.
Not present in boring hole
Mottled soil:
Observed at 3 • 5 feet of depth.
Not present in boring. hole —
Obsurvations and comments:
Depth, Boring number _
in Surface elevation
feet
0
a���k • ��m
z.
Q r ciL-.)r\ C to k, \ oc► w,
8 r c�wn C_\ ml loot —.I
M0iiit
and of boring at 4 feet.
Standing water table:
?resent at feet of depth,
hours after boring.
lot present in borin;; hole �r
lottled soil:
)bserved at 3: 5 feet of depth.
;:ot present in boring hole
Observations and cot=cnts:
Loos of Soil
Boring
-
--
13-27
Location or Project Tprr
_
der r l
Borings made by
60
Date
Classification System: AASHO
USDA-SCS
✓; Unified
other
Auger used (check: two) : Hand
✓, or 1'oc.er ____;
r11ght _, or
iiacl:et th•_;
Depth, Boring number 3
in Surface elevation
feet
0
nLk loaw�
I—
II
Rtd�s1. Bro•an clad loci
2 -
Gnyrs �. B�a.,,r «a�loa.•,
3—
�row� Clyy loa,'.,
4
hno +tlAa
End of boring at --, feet.
Standing cater table: .
Present at feet of depth,
hours after boring.
Not present in boring hole
Mottled soil:
Observed at ^�S feet of depth
Not present in boring hole
Observations and comments:
Depth, Boring nu:abcr _
in
feet Surface elevation
0
End of boring at feet.
Standing: water table:
present at feet of depth,
hours after boring.
Not present in bori::<•, hole
Mottled soil:
Observed at :cat of depth.
trot present in borinj-. hole
Observations and co::,:ncnt:::
CITY OF ORONO
SEPTIC SYSTEM DESIGN PROPOSAL
STANDARD REPORT FORM
ROTE: This form must be completed by the applicant or his agent and submitted for approval with all re-
geired attachments when building permit is applied for. The following exhibits are required as a part of
this application and shalt be attached hereto: Percolation Test Logs and Sit, Boring Logs (on standard
forms); Site Ilan drawn to scale showing locations of existing and pro pos.. •:.ildings. lot lines. perco-
lation test and soil boring hole locations. proposed system location and lax4w:. and well location. THE
HOUSE AIW ORAiNFIELO AREA MUST BE STAKED. Improper or inadeluaie ib!1 or information will result
in delays In processing. Permits will be issued only to contractor's rk,li,ins. a current Orono Septic Sys-
tem installers License.
QFAaV%Ti•+1
TYPE OF WORK:AEW CONSTRUCTION 0
0t11u,,tISION APPROVAL ONLY
PINS NUMBER ff 7 -2 ;'-IY - DOO / .PROPERTY ADDRESS /Si0 Soar f'r ls/At�iiNTiF� q/A.
PROPERTY DESCRIPTION f?c " Af
OWNER_ / /' f /�%rS. �. ,�il�/!}/� �fGo 04'-w Si rJ�l►y z/>>� s
me Mail Address Lity rflone
SITE EVALUATOR
name Mail Address City Phone
* ;3 = sr>t/ r
GENERAL CONTRACTOR .«x 9s../ % T ie/ %t/'�>/ �f�o Q.IIAo D.�laNai.l� 6i�frlAtT
—frame aTT"1<'dTess Ciiy—4Tione
SYSTEM INSTALLER (IF KNOWN) e,,1'r /! i 6 160"If ZY1- ZIC. 'yi%3 i//y/
+mom— • 'T one+ e
TBE INFORMTI011 BELON NOBT U rILLED IN BARED ON THE SITE VALUATION AND DEBIGII UPORT (ATTACII) .
1. SITE EVALUATION / DESIGN CRITERIA USED
NO. OF BEDROOMS_ GALLONS PER DAY PERC RATE MINUTES PER INCH
INDICATED DEPTH TO SEASONAL WATER TABLE OR SATURATED ZONE INCHES
2. SEPTIC TANKS
TANK 1 GAL. MIN. LIQUID CAPACITY MANHOLE TO 6-12" BELOW FINAL GRADE, INLET AND
OUTLET INSPECTION PIPES TO SURFACE REQUIRED ON
TANK N 2 GAL. MIN. LIQUID CAPACITY ALL SEPTIC TANKS.
3. PUMP STATION
D NOT REQUIRED gol't'EOUIRED GAL. MIN. CAPACITY (TO ALLOW FOR 1 DAY STORAGE CAPACITY)
O AGE EJECTOR (BEFDRE SEPTIC TANKS)
EFFLUENT ONLY (AFTER SEPTIC TANKS) CHECK VALVE TO BE USED OYES ONO,
HIGH WATER ALARM AND MANHOLE TO SURFACE REQUIRED ON ALL PUMP STATIONS.
4. DRAINFIELD SYSTEM TRENCHES RESSURE DISTRIBUTION MOUND ❑ OTHER:
ATTACH INFORMATION
TRENCHES: []DISTRIBUTION BOX ❑ DROP BOXES SO. FT. BOTTOM AREA
TRENCH WIDTH (3' VAX.) FT. CENTER -TO -CENTER TRENCH SPACING T.
DEPTH OF ROCK BELOW TILE (6" MIN.) INCHES DEPTH OF ROCK OVER TILE (2" MIN.) INCHES
DEPTH OF TRENCH BELOW ORIGINAL SURFACE INCHES FINAL COVERS" PIN.,24" MAX.) INCHES
NUMBER OF LINES LENGTH OF EACH LINE
PRESSURE DISTRIBUTION MOUND: ❑ STANDARD DESIGN AS PER ORONO DESIGN IIANUAL
❑ OTHER
SAND BASE DIMENSIONS: LENGTH T. X T. WIDTH SAND DEPTH BELOW ROCK INCHES
ROCK BED DIMENSIONS: STANDARD 10 FT. WIDTH X FT. LENGTH SLOPE AT SITE
FOR OFFICE USE ONLY
❑ A/PROVED AS PROPOSED QAPPROVED WITH CHANGES NOTED BELOW ❑ ADDITIONAL ITEMS NEEDED NOTED BELOW
APPROVED BY: DATE