HomeMy WebLinkAbout1992-07-30 Septic System Design Specifications Pg1nOUND SYSTEM DES1UN'1JA1'A
A Sewega Flow Hate (based on Table It Minnesota /R_.'ules, Part 7080)
Type House _ 13R _4le
� 0 gpd
i3 Septic 'ranK Volume ODD' v�'1. ","oo Ai2o
U Soil Charsteristics:
1 Depth to high seasonal zone of saturation level
Mottled soil level 23 inches
2 Average rercolation Rate �o � G. :� min/inch
Design range 3l 41S min/inch�
3 Soil sizing factor 0,93 3 sq. ft./ gpd
It Laud Slope 62 c% %
D RocK ia;+er k Treatment Area) Dimension
1 A150 gals/day X O03 sq ft / gal 3 sq. ft.
of treatment area + 1u_ O sq. ft.
2 _ % O ft. wide X ft. long
3 Hock Volume needed:
4410 sq. ft. treatment area X NVQ ft. depth of rock •
i t cu. yds. X 1 a
• I Ton +) od)U
is Overall Dimensions of Mound:
Wp,� 9, iC� 1't. wide
.3' e. ,..rta•d �• �_ i't. xock width __ ft.
�sy
_y �r i't. .long Hock length % / ft. End Slope Lengtn % ft.
3 total Lawn area ��_ i't. X�C` ft. c� p. ft.
5-'1112-1
0
Amount of nateria.l kededl
1 Sand t Int thick) U U cu. yds.. `�u v,n.-1 , C1.'lG
j Nock l_j..;o ft. thick) yd e. on
j i18M r loam (i ft. thick) _cu. yds. ,+
/e)
q Topsoil k6w thick) U cu. ydto
rumping Tank Capacity$
1 %Or gal tank
is) lwnpint rate 30 rallo»s / cycle with at lentit 11 cycle•/ fay
this 1noludes draltsback caiculntion
kb) Reserve capacity 7U gal k9es enclosed design)
1,ump Size
1 Ilr tgau/min) 30 m
Install an Alarm system in tits house to indicate pub !'allure
metal.!$ both a sound and a light alarm.
Perforated distribution 11pe
11i one ter '
2 1.inoal ft. !!
.3 perforated holes space at _" @part.
Sotbackec . .
Tanks from property line from well % Ir,)1" huli�l�
'rreatreent Area:
1'.•0:3 lake frog$ st enj-!• !Tom property line n
1
:'ron� well �'� i'rom bu�.1��.nGs i j from trees I'
MOUND DESIGN WORKSHEET
(For Flows up to 1200 gpd)
A. FLOW
Estimated L4 rJ gpd 3 'a—&
or measured x 1.5 a gpd.
B. SEPTIC TAMC LIQUID VOLUMES
a - / o 0 o gallons
C. SOILS (refer to site evaluation)
1. Depth to restricting layer • 3 ' (4 inches
2. Depth of percolation testa f a- inches
3. Percolation rate .Mo mpi
4. Land slope _. . c.,
D. ROCK LAYER DINIF.NSIONS
1. Multiply flow rate by 0.83 to obtain required area of rock
layer: 0.83 =
x 50 gpd x 0.83 sq. ft./gpd = 3—`1 sq. ft.
2. Select width of rock layer (10 feet or less) _ �o
3. Length o4rock layer = area + width =
Io sq. ft. + /o ft. _ . ft.
:.
ft.
E.+1lmaled Seva1e Flo -s .n Gsllorts per day
(1pd)
umocr
Of
Type t
T pe 11
Type 112
r1Vpt
13odroonm
#- Nr AW -W
0 Ito 1
std
2
300
227
too
2.00
3
430
200
211
ao�
1
600
277
2.76
r a.
•r.•
3
730
4"
291
0 Nl
6
900
723
232
71010
Clay
600
270
H
1200
677
101
.�....
Rork Bed
atr. war c....N. a PA-.
N.•r•r dM.a�a
Raasd
AStOrpN+a +•dN
to lock laver
u►dth
l+s.i mar -•a
S.
Cas—h
#- Nr AW -W
0 Ito 1
std
1117
too
01 to 7 ••
Fina Sand ••
060
2.00
6 b 13
S«d7 Lowe
me
132
16 I&A
LOS"
Rork Bed
�GrUw
Stnl iltaetlre
pt 'I-1 /o
o"m foot
Raasd
AStOrpN+a +•dN
to lock laver
u►dth
faalarYun 0 1
Cow steel
,.,.,.,..•,•,•,., ,.,•,•,•,•,.,.
vidth 510 It.
0 Ito 1
std
120
too
01 to 7 ••
Fina Sand ••
E. ROCK VOLUME Lenst
1. Multiply rock area by rock dept.'s to get cubic feet of rock;
•} /U sq. ft. x ft. _ cu. ft.
2. Divide cu. ft. by 27 cu. ft. Icu. yd. to get cubic yards;
LjJQ_ cu. ft. -* 27 - J6, J- cu. yd.
3. Multiply cubic yards by 1.4 to get weight of rock in tons;
j cu. yd. x 1.4 ton/cu. yd. _7 tons. r- <<,l9u
F. ADSORPTION WIDTH
1. Percolation rate in top 12 inches of soil is 3j.�- mpi
2. Seler'. allowable soil loading rate from table;
gpd/ftp
3. Calculate adsorption width ratio by dividing rock layer
loading rate of 1.20 gpd/ft2 by allowable soil loading rate,
1.20 gpd/ft1+ ,'"0 gpd/fe - .)- 'Yc,,
4. btultiply adsorption width ratio by rock layer width to get
required adsorption width;
��,`{0 xft= ft
Nbv„ pflo. wt,:•a SWng Table
M'..0011 Aa•
1n �linulta
Iwcfl (MPI)
�GrUw
Stnl iltaetlre
pt 'I-1 /o
o"m foot
Raasd
AStOrpN+a +•dN
to lock laver
u►dth
faalarYun 0 1
Cow steel
—.
--
0 Ito 1
std
120
too
01 to 7 ••
Fina Sand ••
060
2.00
6 b 13
S«d7 Lowe
0 79
132
16 I&A
LOS"
�1 ros7 =
S,b L.
V.%Lown
�sy
0 Nl
300
/t0 to 1:0
9 is
Slower thaw
Clay
—
- -
120.
• sa.l 100 cootie for 1nstallattow of a
uwdard /)aam.
See Tow 01 70 st,e' to 2 1e '6
•• Se.l 1tar.n 30♦ - "Mm of fine ted
Pius .er7 rand.
••• S.,.1 too Ness for m1ukr%ta0n 04 t
eland vd ryl•ent.
see '060 0:10 Ubp 1 1. pale 1 T
G. DOWNSLOPE DIKE WIDTH
1. If landslope is 2.9 percent or less, basal width includes both the
upslope and downslope dike widths,
2. Calculate minimum mound size based on geometery:
a. Determine depth of clean sand fill at upslope edge of rock
layer: Separation /,U feet
b. Multiply rock layer width by landslope to determine drop
in elevation; Slope Difference
10 x CA—%+100= 0'a feet
c. Add depth of clean sand depth of clean sand for �..,.
t I d( 2 d t f k I ---
11 l 694t'04( V
3.�a
3.0�
1 6.r 11.a
separation a ups ope a g6t:a) to ept i o roc ayer to ._...�,.,..
rock depth and the depth of cover to find the total mound
height at upslope edge of rock layer;
/.o ft + 1 ft + 1 ft = 3.6 feet k('
d. Enter table on page bottom with landslope and upslope
dike ratio. Select dike multiplier of 3-S 7
e. Multiply dike multiplier by upsic.pe mound height
to get upslope dike width:3--Y� x 3, c, = // feet
f. Add the depth of slope difference (2b) to [lie upslope
height to get the downslope heightG,;, +3-o =,3, �) feet
g. Enter table on page E -IS with landslope and downslope
dike ratio. Select dike multiplier of 14-S-11
h. Multiply dike multiplier by downslope mound height
to get downslope dike width: ,S x 3. J = / feet
I. Mininmum mound width is the sum of upslope dike
width plus rock layer width plus downslore dike width;
J1 ft + /o ft + /S ft. 3 feet R«ki4%4
j. Subtract the Minimum width G i from the Absorption
width FA to find the Additional Downslope req.iired for
Absorption
ZS' ft - 3_ ft = feet Up
k. Add the Additional Downslope required for Absorptic
to the downslope dike width and recalulate the Total
Mound Width which is is the sum of upslope dike
width plus rock layer width plus downslope dike width
ft + /0 ft + /5— ft = _-36 feet
1. Total mound length is the sum of upsloi -e dike width
plus rock layer length plus up.11ope dike width;
—L ft + _t/L ft + 1L ft= (03 feet
iziC..W th
i.l
61
wm tiv
it
11
71
it
41
141pe
S1
61
71
@1
a.N.
0
iA
40
SO
40
70
So
40
SO
60
70
i0
1
U111,
6.17
136
an
7S1
1.1
I14
476
1K
414
741
114
6QX11 "143
717
1116
7711
PIS
ti]S7
44
1SA
114
Son
•14
S7•
�b
61.5
1'
71A1
6 IS
7 M
• '1
161
145
t
1 17
1 M
3 46
6 06
!.�
667
4S7
In 77
741
71)
100
1Q
SI•
1111
6
Ill
711
•TA
,707
7Sl
)n
lr
611
Ih
1111
1
"AA
s•"
7M
IOH
t)')
1"
111
170
In
170
SU
4
in
it
41)
II S4
1 11
111
Im
1s7
141
Ih
1�
•
411
l7S
•U
I)M
14.7
1M
1M
1�
1.0
110
I.S
I0
11•
647
10 (i
I S (Irl
1111
ill
7 46
Ill
ITS
411
4 M
11
1M
714
II 11
1761
N'/1
176
770
113
161
1"
4
17
444
740
17 SO
1144
11'11
771
7N0
)q
1100
it
/r
A. Determine PUMP capacitr.
1. Minimum suggested is 600 gallon 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 gpan) to prevent build-up of ptew re in drop box.
3. Use value from design of pressure distribution swtem.
SELECT > LMW CAFAMY _':�c Spm
B. Determine head sequirementst
1. Elevation difference between, PUMP and point of diKharge.
2. If pumping to a pressure distribution system, add five feet for pressure
required at anwo*fold ,
_5_ feet
3. Friction loss
a. Enter friction loss table with gpm and pipe diameter.
Read friction las in feet per 100 feet from page F-18. C
F.L a Z S -5 ft./100 ft of pipe
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 lentath •
x 1. , feet
c. Calculate total friction las t;y multiplying
friction loss in h/100 h by equivalent pipe length.
Total friction loss a_ x / , s 5- «100 a feet
4. Total head required is the sum of elevation difference,
special head requirements, and total friction loss.
�9
(1) (2) (311 _
TOTAL HEAD feet
C. Pump selection
I . A pump must be selected to deliver at least _ gpm (Step A) with at least
feet of total head (Step 9).
D. Total Puatpout Volute
I. To maximize pump life select sump size for 4 to 5 pump operations per day.
gpd + 4 a /i 3 gallons per dose
2. Calculate drainback
1. Determine total pipe length. A, o feet.
2. Determine liquid volume of pipe, / 7 `,, gallons per 100 feet. (see page F-18)
3. Multipiy length by volume.. Drainback quantity
C, (� feet x / L. L gallons/ 100 ft. • /7 , { gallons.
Su98ested drainback quantity is 10 percent of pumped quantity. A larger drainback
percentage will decrease pump station efficiency slightly but pumping energy costs am
usually a relatively small part of the total household energy, costs.
3. Total pump out volume eyuais dose volume + drainback
/l,.2--Qallons per dose + / % gallons a _ / C Total Gallons
Pipe LAngth
Point of D
F1es►atioa Diflereitce
EZZ--
F-18b
1.3 isr h 2.0 inch 3.0 inch
1FM nis Pa 100 ft of +
10
0.69
0.20-
2_
12
0.%
0.28
s
.14
1.211
0.38
•
16
1.63
0.48
7
18
2.03
0.60
e
20
2.47
0.73
0.11
2�
3.73
1.11
" :6
5.23
4-W;>
33
7.90
L06
0.30
40
11.07
L64
0.39
43
14.73
3.211
0.48
50
3.99
0.58
35
4.76
0.70
60
5.60
0.82
D-7
0 a.a.Loas r
Of +cseceNce
2
300
maid ,
Z"
300
I b
2_
4w
777
:,a
Ise
s
73o
470
no
•
Ow
327
332
7
1090
f00
370
e
1200
ars
4"
1.25
7.
1.5H
2_
1
2.5
2e
3
3�
4
F�
/yl H is F co/_ /- J
E-4
LAYIER OF GEOTEXTILE LOAMY SAND CAP
FABRIC PERFORATED LATERAL C 1/Z�'
GRASS COVER
6 INCHES
CLEAN SAND FILL TOPSOIL 5
MAXIMUM SLOPE
S� ,a- TO I " - J .C) A
TOPSOIL3 CLEAN ROCK q
PLOWED OR /4 TO 2'/2 INCHES
� SUBSOIL .
DISKED SURFACE /• SLOPE
CROSS S CTION A - A
PIPE Ftm
i
PUMPING CHAMBER '
/n Y ----
PERFORATED t ( r
LATERAI.S
I
•• � i I I
•� / , BED AREA
' I =' I I
2u
20 0 4 20
INCHES !NC- E
DIKE ---L.JO FEET
MA X. --t- DIKE
I
TOTAL WIDTH
PLAN VIEW
"PRESSURE DISTRIBUTION SYSTEM
1. Select number of perforated laterals
2. Select perforation spacing a �_ feet.
3. Since perforations should not be placed closer than 1 ft. to
the edge of the rock layer (see diagram), subtract 2 ft. from
the rock layer length.
ft. 3 y feet. ,
Rods soya1.nOth
4.
5.
6.
7.
Determine the number of spaces between perforations..,
Divide the length above by perfc: :::gin :,pacing and round
down to nearest whole number.
Length pert. spacing .�1 ft. + ft. i spaces
(3) (2)
Number of perforations is equal to one phis the number of
perforation spaces
i 3 spaces + 1 - T- perforations/lateral
Multiply perfor- Hons per lateral by number of laterals to
get total num perforations.
1...r.+. X �fs�lr.r.i' ..1.sC perforations.
uir d fl b 1 1
IV
0+0 1109MORATION M A PROPORATm LAMP&L
TNrY ,
Larw M {• M*G rMrM to tiv
Lae" /M tor-- ,,•,,r�� M�.w r+�l •wed
►.�.,Ztwo crow wi WO101
wCqP N•r M
' '' ra.anw IJMfN «
_ . c,..e tlaa. t.r.
« t..t.o
ed
TAILS OP MPORATM DOC HARCrS M CPM
Head rerforadon dlanrter (I Aw)
I W
r/a
inc
14
21
036
.13
1s
0.61,;,
0.90
2.Or
o� ..
1.04
2.s
OAV ' '
1.17
3.0
0.94 .
1.22
4A
1.13
1.47
s.o
1.0
1.43
•Use 1.0 fool of head for neldendal rystowa.
►Use LO feet of head (mother estabUshmw.- 1
�;—
I W
inc
inc
14
21
_)
.13
C 11�
26
3J
12
16
23
4.0
" It
Is
23
3.0
10
14
22
Determine req a ow rate y mu tip yang
number of perforations by flow per perforation
X �f gpm.
8. If laterals are connected to header pipe as shown on upper
example, to soled minimum required lateral diameter, enter
table with perforation spacing and number of perforations
per lateral. Select minimum diameter for
perforated lateral inches.
9. If perforated lateral system is attached to manifold pipe near
the center, lower diagram, perforated lateral length and
dumber of perforations per lateral will be approximately one
half of that In step 8. Using these values, select minimum
diameter for perforated lateral = inches.
„ now" 16"a r OF •+eawrr ool-wom "no
w
00-0-0
i •
LAYOUT OF PERFORATED PIPE LATERALS FOR
PRESSURE DISTRIBUTION IN MOUND
PERFORATEC PLASTIC PIPE
. P OR 36' N SPA01Np .
PERFORATIONS SPACED 30 RA�/0
ENDON CENT7ER. PERFORATION PERfO
V EW SI Y BE 3�1i, 7�32� _ ��.'
OR A
�— MANIFOLD PIPE
PERFORATIONS ON BOTTOM OF
PLASTIC PIPE
ENO CAP 40"
LAf
.PERfpRA
NGtN pf
�E
A% -�
_ (ALTERNATE LOCATION
OF F:PE FROM PUMP) Q
ce
N,
PI FROM,
PUMP G t�►OBER
REDWOOD, CEDAR OR
' • TREATED POST (4 x 4 min) --,
:..ALL ELECTRIC CONNECTIONS
' . MADE INSIDE BOX
• 6' SPACE
. " WIRE FROM POWER
•` • ` SUPPLY
r•
. WATER TIGHT &' LOCKABLE ELECTRIC BOX
�— PLUG. OR ELECTRIC CONNECTIONS �
20 PVC. CONDUIT SC,H. 1 80
MANH JiF COVER CHAINED B LOCKED
oop
FINAL GRADE
• . -
AT LEAST 12
-GRAD
•.. '
�BELOW
%OP OF POWER CORD
.:,:'� •
PDR SETTLEMENT
PLASTIC ROPE OR CHAIN
WITH ANCHOR
. ALARM FLOAT ON SEPARATE
•s' .'
ELECTRICAL CIRCUIT
.
' ..
START LEE,,, _Z _
�.-•
--130
'.
PUMP CONTROL FLOAT
l
HH
I
Ty
75P
SEALED MANHOLE RINGS
IPE 'S LAID ON A UNIFORM SLOPE FROM
r?_ MP STATION UP T 0 SOIL TREATMENT AREA
FOR PROPER DRAINBACK
—SEALED TANK COVER
IF PIPE AT TANK MUST BE LOWER THAN
UNION TO GET ELEVATION FOR DRAINBACK,
--A 1/4 INCH WEEP HOLE MUST BE USED
— WEEP HOLE
NOTES= ELECTRICAL WIRE FROM POWER SUPPLY .
MUST BE LOT AID BESIDE OTHER MER ANY TASNKKSS
AND MUST BE PLACED IN CONDUIT
ALONG POST
2
ELECTRICAL CORDS FROM PUMP AND
FLOATS MUST BE RUN THROUGH
CONDUIT. WIRES CANNOT HAVE GROUND
CONTACT.
LOOS OF SOIL 130"INtIS
Location 01C. Project
--L) � �...�.
borings made by /��: r' / bat!
Classification System: AASI10 USDA -SCS j ; Unified 1 other _
Auger used (check two)- Iland or hover _1 711pht _� or Bucket '___I other _
Depth, ooring number Drpth, horin► number �-
in Surface elevation In Surface elevation
feet feet
I 0 —
1-
9-
10 —
i
End of boring at S fast.
Standing aster tablet
Present at test of depth,
hours atter boring.
Not present in boring hole_.
mottled 60111
Observed at CA�t of depth.
Clot present in boring hole
�Otr-Yl1,
WaLek Ce.— zo
y
Ap6Q.1 f
10 —
End of boring at �� feet.
Standing water tablet
Present at feet of depth,
hours after "rinit.
Not present In boring hole
Mottled 80111
Observed at f�E. ��depth.
Not prontnt In hntlnp holo,
LodS OP SOIL bohlNdg
Location or. Project �-JC��,�//f'�G��iQ ��"V
boring$ (rade by _ «C� b4te . (� Z 9 Z,
classification Systew AASIM USDA -Sri X Onitied t other
Auger used (check two) I Hand K or Power ____t MOM , —. or bucket , i other
.Depth, Boring nuwbdr ._._ Depth, hotlht nuMet
In SurfAce �levatlon in Su face olo«atlon
feet � � feet /.
D �Lcn7y% � ( /L•
i,
7 _001-
0
0
(&Aek
End of boring,
at �feet.
Standing water tablel
Present at feet of depth,
hours atter boring.
Not present in boring hole_.
Mottled soils
Observed etJ3et of depth.
Hot present in boring hole
10 —
Aot
C.4 -A,
Z 2:10
end of boring at feet.
Standing water tablet
Present at feet of depth,
hoots atter %orinit.
Not present to boring hole X ___-
mottled 90111
Observed at Oil oe'depth.
'lot rrooent in horinp of ie
N
e-39
PERCOLATION TX8T DATA 811221
1 J j �•
Test hole location S: r'� ► ;'; �; h Hoi��iuibar / L ` �' k i �/
Date test hole was preparedG^ `� 1 y_c Depth of hole bottoso %-7 inches. J
DiaMteri of • hola il I ',(-r
: ► in�had �' .
Soil ,data from test.hole1
Depth, inches soil texture
Method of acratdhioh'&id*WAll a5'
Depth of pea-sixed••gravel•in bottom of hole, Z inches&•-
Date and' hour W ihiciai water filling _(pj -?-(d, _!' Z . '
Depth of initial water filling, )'L inched above hole bottom.
Method used to main ain at least 12 inches o *ter depth in hole for at least
4 hour*
Percolst ioh' telt" lreddinid'aide' bpi ' QC/�
,starting at,*•"'' ,
(date)— •a•
during test, % inches.
on
Maximum *star, depth above hole bottom
Time
Time
Interval,
Minutes•
Measurement,
inches
Drop in vater
level, inches
Percolation
rate.
minutes per
inch
Remarks
C
il
<4v
G v _
1
Percolation rate - _ 04�M1
V
minutes per inch.
O -J7
PERCOLATION TROT DATA 811RLT
Time
Interval.
Minutes
M
Drop in water
level, inches
IIA
t
Remarks
�
yl. Teat hole location_ �''�j '�� (� lye%�9��..' 4/V Hoid' flturber 2� ��-t4
W"
Date test hole was prepared Depth of hole bottom# /-,L inchek/
Diameter 'of hole j, ' inthedt'
Soil data ,from test holet
• Depth. inches-, Soil textut�
-- h ` _ mac'•' l/3�oC� �� �� �./a'`� ' �C r1 ��_`
Method of*cratehink'sidewall ICU,�
Depth ofpea-sited-gravel in bottom of hole. �Z inches&
Date and' hour oC lhitiai Vater filling (r�
T
Depth of initial water filling. /2 inches above hole bottom.
Method used to mrinta n at least 12 inches of water depth in holt, for at least
4 hours S j
Percolatiod' telt ' iceddingd'mdde' bt ' ;�- on
?-7starting at a.m. Maxirum valet, 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
c%
v
(,
16
U
ly
l U
Percolation rate minutes per Inch.
PERCOLATION TLBT DATA 8112ET
Test hole location �`{ - J C, ''Lu'- Mo Noah limber <<
Date test hole was prep/ted -Z , Depth of hole bottom -L-. aches�
Diameter of hole` !' r
.. t . �. t.,...
Soil data from test hole) ,,,. ,, t „ r
Depth. inches • ' ii texture
-,-/ -9L
Method of, scratehink'/idev/ll ACI -+:_J
Depth of'pea-sited.-gravel•in bottom of hole, 2 inrhee�
Date and' hour oV ihiiiai Nater filling (o/Z• -Yl % "Z-
Depth of initial water filling, ��' inched Rbove hole bottom.
Method used to maint in 4t least 12 inches of water depth in hole for at least
4 hours
PercolatioIA'telt'tredding/'mAde'bt' _ T�1=- C `L on
.sL/U��tarting at /< �`m''. Maxie _ rater• depth above hole bottom
�Z
date � r ON.
during test, �• inches.
Time
Time
Interval,
Minutes
Measurement,
inches
Drop in water
level, inches
Percolation
rate,
minutes per
inch
Remarks
LO
'Z
_
<
� c i
�. /i k�
/S /
C;
Percolation rate �•�.�� minutes per Inch.
1\_j
H d-39
i PERCOLATION TRST DATA 811RET
Teat 1,(116 location' 7 '-:� tV�ei�f�'l/J Ho16`�Muiber
Date test hole was prepared (,,I Z / I L , Depth of hole bottom, inches:) j
Diameter of hilej inthrdl'
Soil data from test holes,,,,•
Depth, inches Soil texture
1
I
Method of,acratehink'Nidewall ) CL-4,�
Depth of pea-sited.-gravel•in bottom of ho//le. L inches
Date and'hour ot'ihitiai avatar filling �c� ? �Y �� nom,
Depth of initial water filling, ) Z inches above hole bottom.
Method um•' to mal. Iain at least 12 inches of water depth in hole for at least
4 hours- l,I_'t?'V11�� 1. _
Percolotloii'teit'reddingi's,Ado'by' on
w.starting at c e'"r' '. Maxirum water• depth above hole bottom
date �., --p.m.
during test, inches.
Time
Time
Interval,
Minutes
Messurement,
inches
Dru( in water
level, inches
Percolstion
rate,
minutes per
Inch
Remarks
lne7 '2
�)
t All
L� 2
u
Percolation rat' `'4 _� � mimites hrr inch. ,