HomeMy WebLinkAbout1999-011223 - sewer & water - septic � , PERMIT
CITY OF ORONO PERMIT TYPE:
2750 Keiley Parkway- P.O. Box 66 �-:�=:ia.:�i;� :v =:�r:;�r t:
Crystal Bay, Minnesota 55323 Permit Number: :`S`
Date Issued: ����'�'
(612) 473�7357 i_���r��_µ�;4_-,°=
SITE ADDRESS:
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DESCRIPTION:
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REMARKS:
FEE SUMMARY:
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CONTRACTOR. ^—' F�}���.°t ��:R:�:-it. - OWNER:
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APPUCANT%PERMITEE SIGNATURE ISSUED BY:SIGNATURE .i '�`� �
f � /� � ���� �
CTTy OF ORONO SEPTICSI'S'I'E1�iPER1�-IITAPP'LICATION
Box 66 (2750 Kelley Parkway) �
Crystal Bay, I��T 55323 =
JOB SITE ADDRESS: � `/(,� ��� 1-5���=��-
Occupanc}• Type: Residential �_ Commercial Other
Permit Ti�pe: I�'esv or Replacement System, $I00.00 /\ '
Repair Existing System, � $
(Tanks or Drainfield)
0.50 State surcharge added to above fees �
*See fee schedule for non-residential permit fees
O�vner's I�'ame: � J— � Phone\'umber:
NTailinQ Address: � d �.� City: �6�o N�� �P�
a �
Contractor's I�'ame: ' ✓ r=X - Phonei�Tumher:�/�- �sS- J // �.
11�Iailing Address: �v. City:ud��rT�u•.- 7�p: S'S 3�
DO \TOT 1�TALL PA'Yi�'IENT ti�ITH THIS APPLICATIO\T
GE\rERA-L .�i'STRUCTIONS
1, Applications for septic system permits may be mailed or submitted in person at the Ciry
Offices; however, permits will not be mailed out. The permit must be picked up in
person at the Ciry Offices and work must not be�in unless the permit card is on the job
site. J
2, pennits will be issued only to contractors holdin� a City oi Orono Septic System
Installers License.
3, All work must be done in accordance �vich the approved septic system desi�n. Desi�n
reports are not considered approved unless accompanied by the "City of Orono Septic
System Approval" cover shee[ si�ned by the Ciry Inspector.
4, The followin� inspections will be required for all sep[ic systems: _ .
A. Pre-installation site inspection to include inspector, installer, and general contractor.
B. Tank installation prior to cover'ui�.
C. Drainfield trench installation prior to coverin;. For mounds, inspection is required
after rouah-up but prior to sand placemenc (sand will be jar tested for silt content),
and a�ain durin� pressure distribution pipin� installation in the rock bed.
D. Fi.nal inspection to verify proper final cover depths and to verify that all pump station
(where required) components are functional and comply with codes.
5, Individual holdin�MPCA Tnstaller Certificate shall be present durin� inspections: A 2`�"
hour notice is required for all inspections.
� ti
NOT�: Applican[ rriusc initial aIl spaces. Fill in all appropriate blanks, check all appropriate
boxes. .
1. I have received a copy of the system desi�n includin� the Ciry of Orono
Septic System Approval Cover Sheec. �
.2. I �viIl be installin� the followin�:
A. Tanks: Precast Concrete Other anufacturer O�`�Cco�«�
Tank Capacities: 1) c�� gaI. 2) /,$�p s j� ;� Qa1.
o ,
B• Pump Station (if required)
Pump make & model ff i���, �,j�� (attach pump curve &
literature); system desi�n requires apm at feet of head.
, Hi�h water alarm make & model Outside
• electrical work to be completed by installer electrician
other . Inside electrical work must be completed by
electrician.
C. Treatment System:
�_ Trenches: �_ S,f, Mound
Depth of rock below pipe S/�"- Rock bed dimensions 'x '
�_ Drop Boxes Sand bed dimensions 'x '
Distribution Box Pressure Dist. Pipe Diam. "
Maniford Pipe Diam. "
D. Final Cover/Topsoil to be: � borrowed from site
(show location on site pla�) �
trucked in
The undersi�ned hereby appIies to the City of Orono for issuance of a septic system installation
permit, agrees to do aIl work in strict accordance with the ordinances of the City and ihe
regulations of the State of Minnesota, and certifies that all statements made on this application
are complete, true and correct:
Si�natureofApplicant:
' p ' �� �
�. � '
O � CITY OF ORONO
� �
� � � ,
�� SEPTIC S�STEM A.PPROVAL
o �� o
���
' �I'T'Y of O][�OI�'�
� �,�`�����- �
� �t [ �,��;�' biunicipal OfFices
� `� •'ti',�d'r �,� Post OiTice Box 66
,� ��t ����G c���aay,m;�e�sssi3-oa�
�kESH�g'
� LOCATION: 290 Big Island
OWNER: Bill Fink
GENERAL CONTRACTOR: SEPTIC CONTRACTOR:
SITE EVALUATOR: Rusty Olson's Soil & Perc REPORT DATE: February 11 , 1999
The City of Orono has Approved your on-site system design as of February 19, 1999
(approved-disapproved) (date)
widi die following cotrunents:
THIS IS NOT A PERMIT. This is a design approval form which must accompany the site plan. A permit must
be issued to a licensed septic contractor prior to installation. A list of currently licensed septic contractors is
enclosed.
NOTICE TO INSTALLERS: Any changes to the approved plans and specs must have prior approval of the
Inspector (473-7357). Call for inspections 24 hours in advance.
ALL DRAINFIELD AREAS MUST BE FENCED OFF prior to building site excavation and fencing must remain
in place until final site grading. Approval to pour footings will not be granted until tl�e Inspections Department
has verified that primary and alternate sites are adequately protecied.
NO VEHICULAR TRAFFIC OF ANY KIND (cars, trucks, earth moving equipment, e►c.) is allowed within 20'
of tested drainfield sites either before or after system construction. Compaction of these areas could render them
unusable prohibiting the timely completion and or limiting the long term use of the property.
A site copy will be available at the City Offices for the septic contractor.
CITY OF O O
By �,t'_�
Stephen We an, On-site Systems Manager
TELEI'IiONE-473-7357• FAX-473-0510
.S l � �� � �` ,�,` u �-.
� ' � �j Rusty Olson's--Soil and Percolation Testing
�UU
Joseph J. Olson--MPCA License#810
��— (���-!�r�� 11481 Riverview Rd. NE, Hanover, MN 55341
(612) 498-8779
� ���� ._ �
February 11, 1999
Bill Fink
290 Big Island
Orono, Henn. Co.
This on-site Sewage Treatment System is Designed for a Type 1, three bedroom home in
accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances.
Soils on this site are SCS soils mapped -- HBC Hayden Loam. The seasonally high water tablc
was present at 4.2'- 5.0'.
The soils at a depth of 14" have a percolation rate averaging 7.2 min/inch.
The system is designed as a gravelless trench system with drop boxes.
Existing tank must be abandoned.
A lift station will need to be installed in a third tank.
A lift pump must be installed in lowest level to lift effluent to proposed septic tanks.
All neighboring wells are located greater than 50' away and are greater than 50' deep.
Keep all hcavy equipment off of the proposed treatment areas before and after construction.
The treatment area should be marked off before construction. This Design is not valid & the
System will need to be relocated if failure to protect the areas proposed for On-Site Sewage
Trcatmcnt occurs.
With proper instatlation and maintenance, this system should have no problem in treating
septic effluent effectively.
Nothing other than gray water, (laundry, showers, etc.) human water & toilet tissue should be
disposed of into the septic tanks. Garbage disposals are not recommended. Additives must not
be used, they may cause harmful damage to your septic system. It is recommended that you
pump the tank every ycar for 1� tank every year for 1 tank every two years for two tanks.
�
, ��,-
��/ �, (
G. -�
Joseph J. Olson
� .
CITY F OR.O O
BUI�DlN � �
lNSPECTOR
DA �..� PER�IT NO. �--' ^
A�PROVED AS StJBMITTED ��
C AFP�;�VED Y11TH CO�RECTIONS AS NOTEE7
� ��+�"�r�UV'��-C�RRECT&RESUBMI7
� � hese comments a!e for your in�ormation.All work shali�ng
� °" � o T.,f i. 'u;i compliance :•�i;h aH aDplicabte building and zoning L`ode,
R
L tiE Re.ui!ements i;iciud���i',ems not specificallynoteA in this review.
EEF T!-{� p�,�,N SE7 OiV SITE AT ALL TIMES
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`18:4 irt�,1 i /��,1 �n'1.� •
�� �� e� 9 pucdolion Tests Scak� -1- "�
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- � s,�M o �sSoil Borinqs
r• '� ti�- �y �� �Bv�c?: Mork
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�oS.7 �� �F G�11W� , �l\S'S�N� �3Hn11-ow Nole= Tli� system is b be �.0�1$�fl1C�� �0 �T1�
� ,/�' �r, ! �,,,,,� � ti.,o,,se wt« v the ivLr�nesolo Poltu!�on Con'rd Aytncy
• �' � - �„z.5 + � is � Chapter 7080 � �Local Ordinanc
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4��� 4S 7 1`� ��ti
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� _.,` Check all underground Utilities
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• «„T,N` Ruaty Olaon's Sop and Percolatlon Teatlng
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=� �� . " `"�"''� �°''e SO(L BORlNG ELEVATiONS �
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9 7.j 9�.1 r •. /G '/c sC a�' �
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Z�„K 7�tatk rH.�� EL-�Lb."/
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' - �� _ suntf �rt r�.sr nc ta�o so TN.�l2 EL-/lLL9 i
Tr�T a�u o�wr.,r o.,r o�.v TN.trJ EL-�tb.q �
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_ ' I •9 F�RST _7R[utN � �
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� �YSTEM QESIGN �
NpE_ ��3 BEOROOM-Percolatlon rate?�minlnch ( destgn -�s''minlnch)w/drop boxes ' ��A,CKS
: w/iiner Systtm m�st be:
. ' Treatrncnt arca required with,Lo" G r�velless trenc h 57� sq. ft oftrench bottom Tan ao•'irom propacty(Irtes
ar+ea r►eeded:3�"trench width=/�Iin.R of trench needed� proposed numbero(drop boxes� �st� y _so' 7Rr'�cr��s. s0��O°-���w'°�
10" Gr�velleas . pipe_. is,- equivalent 36��wi�e trench . .1��f��QQ�-
Number of tankt uired oL Ist tank/oGD al.,2nd tank/�O al.minimums lus um chamb�r TRttti3EM st'da 7S'fCOctl WctT��'tV�Ouits
. nq , S 8 P P P�8 Tf�GttlMRt tICA��((bft7 P�'�P���_ .
Pumping c6amb�r capacity–25%ot daily sewage tlow�of�gal._[L,�gaL+ratrve storage of I50 ga1BR= y.�gal.+pipe back drainage– �J 'f� �ps
of L�gaIJ100 lin.ft.of � "dia.suPP�y Dipe,lin.ft.n�cd�d�,�8�1+manifold=ga1J100 tin.R of=^dia.pipe,bn.R netded=,=gaL �o '(t'OCTI bIQfl1.
total upacity nerded�gal.(plus ana for pump)use min.�gaL cap. . —
�from trres
Distribution pipe— "dia., — Iin.R, ^ "dia.perforations="apart �
Pump sizt �/3. hp.(pumpabk capacity!,�7 gal.4 cycks/day) �
usE o 30 IrPM AT I'-�' 1-�EA Q
" • Date:o�/l�/�y, Ph. at2�9b-0290
� PROPERTY OF: �1�� ��nr K Rusty Olaon's So11 and Percolatlon Testlng
� ��;� n��_• tciaA�p �
D�:iflned try:
t�R�aO l-I�cQ -- .
11VUlVlUUtiLJCYVAIaC 1ItCl�11V1C1V1 J:C^.11CM WVI(K.7t1C�!
F[.�W . Esamated Sewa�e Flows in Gallons pa day
A. Estimated ys� gpd � �
measured x 1.5= gpd � !'�'R� iT�a ry�m ' T�
SEPTIC TANK VOLUME ' � '
�
B. �o 0 o gallons 2 � 3ou izs iso �,
3 I 430 300 218 ��
v�
SOILS(Site evaluation data) s �so so 2�9a ;�
C. Depth to restricting layer= `-�'��— S,D feet � � � to�6o I 6�00 �io � T YP`�'
D. Maximum depth of,system C-3 ft= �•a-a.ofeet . 8 ; i� I s�s aos � �n
E. Texture�N�Y G�n, Percolation rate �� �1�IPI � � '`"�
F. SSF �,a� sq ft/gpd
G. Slope /o % Tank G �u �
Liywd upxuy
,lnmhv o( Mioimum l�yuid . opxiry vMh witb�Ls�usalk
TRENCH BOTTOM AREA Bediaoioi �D'°`'' �a°'�`d'�' �0ia"�`
H. For trenches with 6 inches of rock below the pipe: Z3 w';` �� ;� :,,��,
A x F= x = sq ft of bottom azea ,`x';wy !� ;� ��
I. For trenches with 12 inches of rock below the pipe:
AxFx0.8= x x0.8= sqftofbottomarea �����A�
J. For trenches with 18 inches of rock below the pipe: for e Treacmmc
A x F x 0.66= x x 0.66= sq ft of bottom area �a,�;� �,,,«
K. For trenches with 24 inches of rock below the pipe: ►�� �cd sai Tacwre fac pa gallon
A x F x 0.6= x x 0.6= sq ft of bottom area �M� P"��
BED BOTTOM AREA F��o.�• co�s�d --
0.1 W S Sand 0.83
L. For seepage beds with 6 or 12 inches of rock below the pipe; o.t w s, w,e sana•�
1.5 x A x F= 1.5 x x = sq ft of bottom area 16 w��o "��l-O°1O ':'-�
si was suc t.o� �o0
ROCK VOLUME IN CU FT '�tO 60 p"'�-OiQ1 ='-0
sio�«�ba•• cu� .,-
M. Rock depth below distribution pipe plus 0.5 foot times bottom area: . S���ra s�a�a�unau
M=Rock depth+6 inches x Area(H,I,J,L,K) � use:ys�a tor ca�y�ie so�.
( +�.5��X = N�{ " Soil havw�50'�r a ma�e of fuu sand
...plm vav fiae saod.
ROCK VOLUME IN CU YDS Soil with too 6iQh a pa�aYe of ctay for
N. Volume in cu ft divided by 27 �a�of aa;n�ound uaoa�a risc«n.
M+27=cu yds_+27= cu yds 6 inche�: 0%aRednction'
ROCK WEIGHT
O. Cubic yazds times 1.4=tons 12.1IIClle�?A%ReduCtiOil
N x 1.4,=tons x 1.4= tons 18.InClie�349�ltednction
24 inche��4096�Rednction
5YSTEM LENGTH *�g�r giavellesS'treilCh
P. Select trerch width= ft .
Q. L?ivide bottom area by trench width: (H,I,J,or K)+p=
lineal feet Geotextile Fabnc
_+___lineal feet ���+•'b�i?��:::�; t 2"Rock Covu
Ql. Gravelless Design � `�-i»���'} �'aw�;
e
A x F+(3 for 10"pipe,2 for 8"pipe,width of the Chamber) :*�'`" bYra.°;
�X.1�Zi-�=11]_feet :�� ei���.�r oo� 4"D;sc.Pipe
4r��� .:d�*�brr
�.,.Pei.. e.
LAWN AREA oa,ac:�•o•+o
� a�r�•.+:.�.
R� Select trench s acin center to center= feet �rQP��°��`"""'ve�'`-o 0
P 8� � ��.. ���.,� ...
S. Multiply trench spacing by lineal feet R x Q=sq ft of lawn area r � �����y
.:. ;'t:�'ei� os.oe ,��r}�'..aD.•j
.��A4�4���.1t�Ati�.�wer+c�
s i;�. ir.ic a;t..�it�l.�ya�OR�l1 t�
s x�_ � s sq fc .,;:��;:o`:. `.��ai� 6-�4 Rock
�.+�'c* g4 v r-�.ae�` • 3�4-2 1/2��
LAYOLTT(Use other side) d .a•p''/���p.'�• �`•' a••
�(�.•�.s.wc.r.aw�w�p�}wo�a•
, .;�QY�..��.1wT��W1i�w:�.i)Q
jf't.:v*roJ}cf. w�'v.}�t'(r.r�.�.d:
1.Select an appropriate scale;one square= feet . d*�$.,�Qe�J�Q„�e��;�e�d.,
b:i9�i �.:�.�a��°".w:Ne::
2.Show pertinent properky boundaries,right-of-way,easements. �t,4t,4s�ar.�.,�,,,o�.�,,,,b,.p,4»
3.Show location of house,garage,driveway,and all other
improvements, existing or proposed 18-36'wdth
4.Show location and iayout of sewage,treatment system. �
5.Show location of water supply well.
6.Dimension all set backs and separation distances.
PUMP SELECTION PROCEDURE
A. Determine pump capacity:
Gravity Distribudon
1. Minimum suggested is 20 gpm
2. Maximum suggested is 45 gpm Perfontion Discharges in GPM
Head Perforation diameter '
Pressure Distibution Eeet inches
3. a. Select number of perforated lateraLs . �/32 1/a
b. Select perforation spacing= feet. . 1.Oa o.56 0.74
c. Subtract 2 ft. from the rock.layer length. ls 0.69 0.90
Rxk laya�en�th
-2 ft.= feet. . 2ob o.so i.o�
d. Determine the number of spaces between perforations. a Use 1.0 foot single homes.
Length perf.spacing= ft.+ ft.= spaces b Use 20 feet for anything eLse.
e. spaces+1 = � perforations/lateral
f. Multiply perforations per lateral by number of laterals to
get total number of perforations. y�s x .�= perforations.
g. � x �T�= gpm.
SELECTED PUMP CAPACTTY � gpm
B.Determine head requirements:
1. Elevation difference between ump and point of dischazge.
��, feet
2. If pumping to a pressure distribution system,five feet for pressure � �°`'`�"a""`s`�""'
required at manifold if gravity system,zero. °"'"``�°'
_��feet T°nl p'p�1°`�t!'
3. Friction loss
a. Enter friction loss table with gpm and pipe diameter. �N„o„��
Read friction loss in feet per 100 feet from table(F-14). �'�'
F.L.= I 5 5 ft./100 ft of pipe ._
b. Determine total pipe length from pump to discharge� ._._ _ -------------------------------------
point. Estimate by adding 25 percent to pipe length for fitting
loss,or use a fitting loss chart(F-15 feet).
Equivalent pipe length-1.25 times pi�e length= �
�.S- x 1.25= 9 `� feet Friction Loss in Plastic Pipe
c Calculate total friction loss by multiplying
friction loss in ft/100 ft by equivalent pipe length. Nominal
Total friction loss= I� S r x + � pipe dia.
�_ 100= feet Flow Rate
4. Total head re quired is the sum of elevation difference, �m 1.5" 2" 3"
special head requirements,and total friction loss.
20 2.47 0.73 0.11
�+ a + � 25 3.73 0.16
(1) (2) (3c) 30 5.23 1.55 0.23
35 6.96 2 6 0.30
40 8.91 264 0.39
TOTAL HEAD /�_feet 45 11.07 3.28 0.48
50 13.46 3.99 0.58
C, Pump selection 60 5 bo o s2
65 6.48 0.95
70 7.44 1.09
1. A pump must be selected to deliver at least
3v gpm (Step A) with at least �_feet of total hea�i (Step B).
LOGS OF SOIL BORING
License #810
Location or Project: Bill Fink -- Orono
Borings made by: Rusty Olson's Soil and Perc. Testing Date: 2/11/99
Classification System: AASHO ; USDS-SCS_X_; Unified ; Other
Auger used (check two): Hand_X_, or Power , Flight , or Bucket_X_
Depth Boring Number_1_ Depth Boring Number_2_
in Surface Elevation 100.9 in Surface Elevation 102.9
Feet Feet
0- 0-10" Dark Brown Loam 0- 0-10" Dark Brown Loam
1 OYR3/2 10YR3/2
----------------------------------------- -----------------------------------------
1- 10"-24" Brown Sandy Loam � 1- 10"-16" Brown Sandy Loam
lOYR 3/4 lOYR 5/4
2- ----------------------------------------- -----------------------------------------
24"-40" Brown Sandy Loam 16"-24" Brown Clay Loam
3- 10YR5/4 10YR5/4
----------------------------------------- 2- -----------------------------------------
40"-50" Yellow Brown Sandy 24"-40" Brown Loam
4- Loam 10YR7/6 3- 10YR6/6
----------------------------------------- -----------------------------------------
50"-60" Rusty Yellow Brown 4- 40"-60"Brown Loamy Sand to
Sandy Loam 10YR7/6 Gravel 10YR6/6
R-- 2.SYR4/8 G-- 10YR7/1 5- -----------------------------------------
5- ----------------------------------------- 60" Hit Rock
End of boring at_5_feet. End of boring at_5_ feet.
Standing water table: Standing water table:
present at feet of depth, present at feet of depth,
_24_hours after boring. _24_hours after boring.
Not present in hole_X_. Not present in hole_X_.
Mottled Soil: Mottled Soil:
Observed at_4.2_feet of depth. Observed at feet of depth.
Not present in hole Not present in hole_X_.
Comments: Comments:
LOGS OF SOIL BORING
License #810
Location or Project: Bill Fink -- Orono
Borings made by: Rusty Olson's Soil and Perc. Testing Date: 2/11/99
Classification System: AASHO ; USDS-SCS_X_; Unified ; Other
Auger used (check two): Hand_X_, or Power , Flight , or Bucket X_
Depth Boring Number_3_ Depth Boring Number
in Surface Elevation 100.9 in Surface Elevation
Feet Feet
0- 0-10" Dark Brown Loam
10YR3/2
-----------------------------------------
1- 10"-18" Brown Sandy Loam
lOYR 5/4
-----------------------------------------
18"-30" Brown Clay Loam
2- 10YR5/4
-----------------------------------------
3- 30"-54" Yellow Brown Sandy
4- Loam 10YR7/6
-----------------------------------------
54"-60" Rusty Yellow Brown
Sandy Loam 10YR7/6
R-- 2.S YR4/8 G-- l 0YR7/1
5- -----------------------------------------
End of boring at_5_feet. End of boring at_feet.
Standing water table: Standing water table:
present at feet of depth, present at feet of depth,
_24_hours after boring. _24_hours after boring.
Not present in hole_X_. Not present in hole
Mottled Soil: Mottled Soil:
Observed at_4.5_feet of depth. Observed at feet of depth.
Not present in hole Not present in hole
. Comments: Comments:
PERCOLATION TEST DATA SHEET
Lic.#810
Percolation test readings may by: Rusty Olson's Perc. on 2/11/99 starting at 1:05 p.m.
Test hole location: Bill Fink-- Big Island, Orono Hole number 1,
Depth of hole bottom 14 inches, Diameter of hole 6 inches.
Soil data from test hole:
Depth, inches
Soil Texture
0"-10" Dark Brown Loam 10YR3/2
10"-14" Brown Sandv Loam 10YR3/4
Method of scratching sidewall: Knife
Depth of gravel in bottom of hole 2 inches
Date and hour of initial water filling 1:00 p.m. , 2/10/99 , depth of initial water filling 12 inches above
hole bottom.
Method used to maiiltain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon
, Maximum water depth above hole bottom during test 6 inches.
Time Time Depth Drop in H20 Perc. Rate
1:OS PREFILL
1:17 1:47 6 3.5 8.6
1:52 2:22 6 3.37 8.9
2:23 2:53 6 3.25 9.2
Percolation rate " 8.9 minutes per inch
PERCOLATION TEST DATA SHEET
Lic.#810
Percolation test readings may by: Rustv Olson's Perc. on 2/11/99 starting at 1:05 p.m.
Test hole location: Bill Fink-- Big Island, Orono Hole number 2,
Depth of hole bottom 14 inches, Diameter of hole 6 inches.
Soil data from test hole:
Depth, inches �
Soil Texture
0"-10" Dark Brown Loam 10YR3/2
10"-14" Brown Sandy Loam 10YR5/4
Method of scratching sidewall: Knife
Depth of gravel in bottom of hole 2 inches
Date and hour of initial water filling 1:00 p.m. , 2/10/99 , depth of initial water filling 12 inches above
hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon
, Maximum water depth above hole bottom during test 6 inches.
Time Time Depth Drop in H20 Perc. Rate
1:05 PREFILL
1:18 1:48 6 4.25 7.0
1:51 2:21 6 4.0 7.5
2:24 2:54 6 3.87 7.7
Percolation rate " 7.4 minutes per inch
PERCOLATION TEST DATA SHEET
Lic.#810
Percolation test readings may by: Rustv Olson's Perc. on 2/11/99 starting at 1:05 p.m.
Test hole location: Bill Fink-- Big Island, Orono Hole number 3,
Depth of hole bottom 14 inches, Diameter of hole 6 inches.
Soil data from test hole:
Depth, inches
Soil Texture
0"-10" Dark Brown Loam 10YR3/2
10"-14" Brown Sandv Loam 10YR5/4
Method of scratching sidewall: Knife
Depth of gravel in bottom of hole 2 inches
Date and hour of initial water filling 1:00 p.m. , 2/10/99 , depth of initial �vater filling 12 inches above
hole bottom.
Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon
, Maximum water depth above hole bottom during test 6 inches.
Time Time Depth Drop in H20 Perc. Rate
1:05 PREFILL
1:19 1:49 6 5.5 5.4
1:50 2:20 6 5.5 5.4
2:25 2:55 6 5.5 5.4
Percolation rate " 5.4 minutes per inch
D-36
Part 3: Gravelless Options �
for Trench Systems
The Gravelless Trench has been used in Texas since 1971. It is an
extremely viable option for onsite sewage treatment in Minnesota,
and testing and data show that it is as reliable as a trench filled with
gravel. As a result, it has been adopted as a standard system for use
in Minnesota. (See Figure D-33.)
The idea of using something other than rock to hold the trenches apart
is not new. Chapter 7080 currently recognizes two acceptable options.
The first is gravelless pipe, which is corrugated pipe surrounded by a
synthetic fabric. The second is a chamber made out of a nondegradable
material, typically plastic, used to hold the soil apart.
Natural soil has been used to construct gravelless systems, and they �
should be backfilled with natural soil. Do not backfill with drainfield
rock. If an excavation is only 2 feet wide and has been filled with
gravel with the pipe on the inside, the biomat will not develop at the
pipe-gravel interface, but will instead develop at the rock-soil
interface. Instead of having a 3-foot-wide trench, the size has been
effectively cut down to a 2-foot-wide trench, causing a potential
problem. .
Tree roots do not affect gravelless systems. The solidity of the joints
and the other parts of the system allow placement of this system close
to trees. The system may, however, cause potential damage to nearby
tree roots, but the tree roots will not affect the system.
Advantages of a Gravelless System
O It can be relatively shallow.
O It is easy to install.
O It is lightweight and can be canied into remote, difficult-to-reach
sites. It is also easy to handle and deliver.
O Little cleanup is required after installation.
O It can be installed on a steep slope because of the minimal amount
of equipment necessary for installation.
D-37
O It is easy to lay out.
O Material is consistently sized.
Disadvantages of a Gravelless System
O No sizing flexibility exists.
O Potential problems can occur in areas of fine sand.
O Cost of materials is dependent on manufacturers.
Gravelless Pipe System
Gravelless pipe is a corrugated pipe used in place of gravel for a trench
system. This pipe typically has an inside diameter of 8-10 inches. �
The corrugations are usually 1/2 inch, with 3/4-inch separations.
GRAVELLESS TRENCH CONSTRUCTION DETAILS
1 1/2" Inspection
Inlet Pipe to Next � �/2 Male Well
Dron Box Adapter
12" Soll BackliU
:> .
Corrugated Tubing Covered
wilh Geotexlile F�bri
Drop E3ox I �
r Trench Longth • up to 100 Fee1
Ovorfill to Allow ��S: 1. Bottom o( trenci� must be level. Top
tor Settling ot tubing must bo Ievei.
� Soil �2° ol Soil 2. Scarify tronch boltom and sidewalls
� Backfill � Backlill el leflst 12 inct�es aboro trencti bottom
24" ' �
� ' to exposo notural soil.
� ,
' ' 12"
�-- - '—�. 3. For proprialory products consult
� Holes Located manutacturors perlormonce crJteria.
24 at 4 and
8 O'Clock
Figure D-33
D-38
To meet code requirements, the corrugated pipe also has to have 1/2-
inch holes in the pipe bottom. Typically, manufacturers place the holes
at 4 o'clock and 8 o'clock. (This placement is not a code requirement.)
Gravelless pipe systems are allowable, since the rock that traditionally
separates trenches provides little or no treatment of the effluent prior
to it being dispersed into the soil. Any [ype of system that holds the
soil apart is acceptable as long as it has an established loading rate.
The loading rate for gravelless pipe systems was developed through
testing in Minnesota. The testing consisted of breaking systems in -
different soils into small pieces and measuring wastewater flow into
the section and out of the section. The resulting loss of effluent was the
soil loading factor. By breaking these systems into relatively small
pieces, the long-term loading rate was determined quickly and a good
design number has been established.
The loading rate for a 10-inch gravelless pipe was found to be .
equivalent to that of a 3-foot-wide trench with 6 inches of rock
below the pipe. The S-inch pipe (inside diameter) was equivalent to a
2-foot-wide trench with 6 inches of rock. These loading rates are key
to the design of the system.
Potential problems Fine sands have been found to develop a slower
long-term acceptance rate, even though they have the same
permeability and water flow characteristics as a medium sand. During
field reviews, this problem has been noted most often with fine sands.
One of the keys to making a gravelless system work is choosing the .
proper synthetic fabric for wrapping the pipe.
O Fabric that is too elastic will collapse against the pipe as dirt
is put back around the pipe, not allowing sewage to move
around the outside.
O Fabric that is too stiff or too thick (or both) will not allow
movement of water out of the system.
O Appropriate fabric allows sewage to flow around
the corrugations so that a biomat can develop around the entire
pipe (which is why the sizing factors relate to a wider trench).
Some evidence suggests that the fabric also wicks the effluent
around the outside of the pipe, using the entire depth of the
system. This wicking will also move moisture closer to the
surface and allow greater evapotranspiration.
, - • �
F-8
REDWOOD,CEDAR OR .
'I'REATED POST(4 x 4 min)
WATER T[GHT&LOCKABLE ELECTRIC BOX
PLUGS OR ELECTRIC CONNECTIONS`�� �'L�''�RIC CONNECTIONS MADE
INSIDE BOX
6"SPACE
2"PVC CONDUIT SCHEDULE 80 � SOO�ME�R CORD FOR
CLEANING ACCESS COVER
CHAINED&LOCKED NAL GRADE
AT LEAST 1
SEALED CLEANING NION B�W d��E �yIRE FROM POWER SUPPLY
ACCESS RINGS � plpg IS LAID ON A UNIFORM SLOPE FROM
.�..� w''•^ •.: '•. ' '' PUMP STATION UP TO SOIL TREATMEN'C AREA .
, FOR PROPER DRAINBACK
SEALED TANK COVER �IF PIPE AT TANK MUST BE LOWER THAN
UNION TO GET ELEVATION FOR DRAINBACK,
PLASTIC ROPE OR CHAIIV A 1/4 INCH WF.EP HOLE MUST BE USED .
' WITH ANCHOR
ALARM FLOAT ON SEPARATE WF.EP HOLE
ELECIRICAL CIRCUIT
� N�S�MUFS NOT R NI OVER ANY TANKS BUT Y
S�T L�`'�L` MUST BE LAID BESIDE OTEiER TANKS
3„ •.
AND MUST BE PLACED IN CONDUIT
` SHUT OFE�EVEL ALONG POST
PUMP CONTROL FLOAT ELECTRICAL CORDS FROM PUMP AND
0�0 � �ATS MUST BE RUN THROUGH
CONDUIT. WIRES CANNOT HAVE GROUND
CONTACT.
Fi¢ure F-8
PENC�
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MEASURE SCUM AND SLUOGE ACCUMULATIONS
I N THE SEPTIC TANK ' •
C� D�+TE TIME
CITY OF ORONO CALLED IN D/ 9
INSPECTION NOTICE SCHEDULED /O %O O
PERMIT NO. cOMPLETED
ADDRESS �
OWNER � CONTR.
TELEPHONE NO. '�� ' �o S �d
� DESCRIPTION
l� 01 FOOTING 11 MECHANICAL RI 18 EXCAV/GRADING/FILLING
� 02 FRAMING 13 MECHANICAL FINAL 19 LAKESHORE/WETLANDS
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Z04 WA BD. 'I��7" 12 WATER HOOK-UP 17 SITE INSPECTION
Q 5 FINA ��4�,L�J 14 SEWER HOOK-UP 06 PROGRESS
� EMO-SITE 27 SEPTIC MAINT. 21 COMPLAINT
J 07 DEMO-FINA� 1 TALL. 22 FOLLOW-UP
= 09 PLUMBING RI 23 SEPTIC FINAL 35 HARD COVER REMOVAL
J 10 PLUMBING FINAL 36 FOUNDATION/REMOVAL
� OWNERICONTRACTOR TO MEET YOU:_YES_NO
� COMMENTS:
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PERMANENT
❑CORRECT UNSAFE CONDITION WITHIN HOURS. -- pHOTO TAKEN
INSPECTOR WILL RETURN
i-; CITATION ISSUED
❑STOP ORDER POSTED.CALL INSPECTOR
❑ INSPECTION REQUIRED.CALL TO ARRANGE ACCESS.
Call for the next in�ction 24 hours in advance.473�73�J7
OwnerlCont a qP sit
Inspector.
White Copyllnspector's File Canary CopylSite Notice
DATE � � TIME
CITY OF ORONO � CALLED IN �� '
INSPECTION NOTICE I��Z� SCHEDULED � ' C)
PERMIT NO. � MP ETED �
ADDRESS �
OWNER CONTR. Q�[,1Y,�S d. S�CI'--
TELEPHONE NO.
� DESCRI�TION ��� � �w�
l� 01 FOOTING 11 MECHANICAL RI 18 EXCAV/GRADING/FILLING
� 02 FRAMING 13 MECHANICAL FINA� 19 LAKESHORE/WETLANDS
�
Q 03 INSULATION 24/25 WOOD BURNER/FIREPLACE 34 TREE REMOVAL
Z 04 WALL BD. 12 WATER HOOK-UP 17 SITE INSPECTION
Q 05 FINAL 14 SEWER HOOK-UP 06 PROGRESS
� 07 DEMO-SITE 27�EP�GA4Alf�! 21 COMPLAINT
� 07 DEMO-FINAL �5 SEPTIC WST 22 FOLLOW-UP
= 09 PLUMBING RI 23 SEPTIC FINA� 35 HARD COVER REMOVAL
J 10 PLUMBING FINAL 36 FOUNDATION/REMOVAL
� OWNER/CONTRACTOR TO MEET YOU: YES�N ` i �—�
� COMMENTS: � 5 G C� �ir�.J�
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� BEFORECOVERING PERMANENT
❑CORRECT UNSAFE CONDITION WITHIN HOURS. C PHOTO TAKEN
�NSPECTOR WILL RETURN
O STOP ORDER POSTED.CALL INSPECTOR ❑ CITATION ISSUED
❑ INSPECTION REQUIRED.CALLTO ARRANGE ACCESS.
Call for the next in pection 24 hours in advance.473-7357
OwnerlContractor o --
Inspector.
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White Copy/lnspector's File Canary Copy/Site Notice