ORDINANCE and CODE REGULATING

INDIVIDUAL SEWAGE DISPOSAL SYSTEMS I! -

Recommended by the

IESOTA t RTMENT LTH

"n

'1971

block a t least 4 inches thick, laid in a radial arch to suppor the pit walls.

Foreword

CONTENTS Page

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Short fo1.m ol.dir.aen, adopting by referen:.e the 1071 edition of The Minne- sota Individual Sewage Disposal System Code ............... ... .................. 3

Complete ordinance incorporating the Minnesota Individual Sewage Dis- posal System Code by inclusion in text ..................................................... 6

Minnesota Individ-~al Sewage Disposal System Code of Minimum Stand- ards Reeomme~ided by the Minnesota Department of Health .................. 10

FOREWORD These model ordinances are intended for the use and guidance of political

subdivisions in the preparation of ordinances and regulations governing the design, eonatruction and maintenance of individual sewage disposal systems. The requirements therein are minimum requirements and should not be Lowered in working ordinances deve!oped therefrom. In fact, under unus.ml local condi- tions and circumstances need for raising various of the specific requirements may be indicated.

In some instances councils or boarda acting to adopt ordinances of this nature may feel that there is a compelling reason for reduction of certain requirements such as those relating to tho separation between the water supply well and the buried castiron sewer nerving the same single family dwelling. Impracticality and awkwardness of providing the specified separation without mrificing the convenience of integral well housing is the most common a g u - ment advanced for reducing thiv requirement. Howevu, careful planning of the drainage and water supply system can obviate an apparent need for cmwd- Ing theme facilities togethzr.

(b) The brick, stone or block shall be laid water-tight above tb inlet and with open joints below the inlet to provide adequak passage of liquids.

(c) A minimum annular space of 6 inches and preferably 12 inchet between the lining and excavation wall shall be filled wit1 crushed rock or gravel.

(d) The seepage pit shall be so constructed a t the top aa to h capable of supporting the over-burden of earth and any reason able load to which it is subjected. Access to the pit shall bq provided by means of a manhole or inspeetion bole equippa with a waler-tight cover. The seepage pit may terminate in a conventional manhole top, frame and cover. The top of thl seepage pit shall be not less than 12 inches below the grounc. .; " , surface. Where the top is more than 18 inches below tht . -- .3J .& -

3 ground surface there shall be provided an inspection pipe 01 . - not less than 4 inch diameter extending through the cover to a ... c:;: point above the tank not more than 6 inches below finishei a. gronnd level. The top of the inspection pipe shall be provided

with a readily removable water-tight cap and its location shall ,

. . .....

. ~ 9 $e marked at the ground surface. -.

: . i . Y

.Minnesota Conserration Regulation 71 Relating to Statewide Standards and Criteria for bmg-nt of Shoreland A r e s of Minnesota requires thet septic tanks and soil absorption fields be 1-ted a t distances greater than 50 feet f m latea and s t r m ( 7 5 feet from Recreational Develomnt Lakes and 150 feet f r m Natural Environment laker and stream). Inf-tian relative to the claaaification of lakes in a covnty is avai1oble.t the comty court house of the county "here the laten are lmated.

The Minnesota Department of Health should be consulted during the preparation of individual sewage disposal system ordinances. This is especially importiant when any reduction of requirements i s under consideration.

SHORT WRM ORDINANCE (1 ) The trench above thr filter matetlal shall he oorrfi:led with 4 to 6 inches of eartii. The backfill shrill br ha:id-lemped.

(8) Before filler niaterial is placed, a11 srneared or compartcd soil in the trench botlom shall be broken up nnd removed by raking or other effective mcans to pmvide natural soil conditions.

g. Seepage Piw '

(1) Seepage pits shall be used f - ~ r disposal of septic tank effluent only when such use is indicated by favorable conditions of soil. ground- warm levul, or topography, and where such us? does not reduce the

i; safety of surrounding water supplies. The pit excavation shall terminate nt lcasi 4 feet above the highest known or calculated ground-wxler tnblc. The depth of the exravation shnll not exceed 50 percent of the dvyt.h of azy well casing in the area or 20 feet. whichever is least.

(2) A di~tributioe box which iu conrtrocted in accordance with item 4c .i& shall be required when two or more seepage pits are connected and

It! r k . . used in parallel.

(3) The location of wepage pit.s, in addition to t.he general provisions under item 4g(l) shall be not less than the stated minimum dis- tances f r c n ~ the following:

-.. ,, (a) Any water supply well or buried water auction pipe ...... 75 feet

(b) Occupied buildings ............................................................... 20 feet !I. . * A ! .r: . ail.. (c) Property lines and buried pipe distributing water under ,I ::-. pressnrc 10 feet

(d) Other seepage pits ...... 3 times the diameter of the largest pit (edge to edge)

(4) Effective absorptdon area of a seepage pit shall be calculated as the sidewall area belov: the inlet, exclusive of any hardpan, rock, or

7. " ' clay formations. , .

(a) Rcqnired seepage area shall be determined by the percolation test described in item 4d and from Table 2. A percolation test shall be made in each vertical stratum penetrated by the seepage pit, and the weighted average of the resnlts, exclurive of results from soil strata in wbich the percolation rate exceeds 30 minutes, shail be canputed and applied to Table 2 ns indicated.

(b) A minimum of 4 feet composite depth of porous formation for each installatio~r shall tie provided in one or more pi@.

(c) All pits shall hnve a diamctcr of a t least 4 feet.

(5) Construction of all seepage pits shall conform to the following requirements:

(a) To prevent cave-in, the pit shall be lined with brick, stone or

AN ORDINANCE REGULATING THE INSTALLATION, CONSTRUCT10 ALTERATION. EXTENSION. REPAIR. AND MAINTENANCE OF I , ~ ~~~~~. ~ ~~ -~ - - -. DIVIDUAL SEWAGE DISPOSAL SYSTEMS; REQUIRING PERMI' FOR, AND LICENSING OF PERSONS ENGAGED IN THE W: STRUCTION THEREOF; PROVIDING FOR INSPECTION; PRESCRI ING PENALTIES; AND ADOPTING BY REFERENCE TlIE 19 MINNESOTA INDIVIDUAL SEWAGE DISPOSAL SYSTEM CODE

The City (Village) of ordains:

Section 1. Definitions Subdivision 1. The following definitions sh apply in the interpretation and enforcement of this ordinance:

SUM. 2. Sewage: Sewage is any water-carried domeatic waste, exclusi of footing and roof drainage, of any residence, industry or commercial eau lishment, whether treated or untreated, and includes the liquid waster produc by bathing, laundry and cnlinary operations, and from toilets and floor h i 1 Raw sewage is sewage which has not been subjected to any treatment praa

Subd. 3. Individual Sewage Disposal System: An individual sewage d i..~ ..- posal system is a sewage disposal system, other than a ~ u h l i c or communi ' . , . . , spstcm, which receives sewage from an indiviaual establisnment. J n l e h a'th*

wise indicated the word "system" as i t appears in this ordi~unce means "in, 5?. . ~ - c vidusl sewage dispoaal system." ~r .,:.,: ?. :I:+

Subd. 4. Building Drain: The building drain is that part of the lowe

, horizontal piping of a building drainage system which receixea the dimhar

:ti .V.l from soil, waste, and other drainage pipes inside the walls of any building a conveys the same to the building sewer.

. L.. Subd. 5. Building Sewer: The building sewer is that part of the horizon^ uortion of the buildinn drainaaa system extending from the buildinn d n i n

.< ' its connection with the-septic tank and carrying the sewage of but o k buildix , . , I .

: I. SH. 2. The edition of the Minnesota Individual Sewage Dispoz . ~~ .. System Code of Minimum Standards recommended by the Minnesota Deprc

nlent of Health is hereby adopted by reference' and made a part of tl ordinance as if fully set forth herein. Before publication of this ordinance t city (village) clerk shall mark three copies of this code a s omcia1 copiea a file them in his offic-e for use and examination.

Sec. 3. Licensing. No person, firm or corporation shnll engage in t business of installing and constructing sewage disposal systems within the ci (village) of - without first obtaining a licen to carry on such occupation from the city (village) council and procuring a posting with the city (village) clerk a bond in the amount of - in favor of the city (village) and the puhiic. conditioned upon the faithful PI formnnce of co~itracts and compliance with this ordinance. Such license shall reiiawable annually on or before - a n d may ne revoked refused renewal by the council for cause. Any installation, construction, altei -- IMinn. Slatul- &. 411.62 D E ~ B ~ I I ~ the .doptlon of rode br nlmnm -1- three sop to he marked &Id aod fIl;d in Ute ob6 . s olllec for public use.

rron or repalr or a sewage alsposa system ~y a llcensee m vlolamon or me provisions of Section 6 of this ordinance or refusal on the part of a licensee to correct such defective work performed by such licensee shall be cause for revocation of or refusal to renew a license.

Before any license issued under the provisions of this section may be revoked o r its renewal refused, the licensee shall be given a hearing to show cause why such license should not be revoked or refused. Notice of the time. place and purpose of such hearing shall be in writing. The annual license fee shall be dollars. Application for such license shall be made annually on a form furnished by the council.

Sw. 4. Permits. Subdivision 1. No person, Arm or corporation shall install, alter, repair, or extend any individual sewage disposal system in the city (village) without Arat obtaining a permit therefor from the council or its authorized representative for the specific installation, alteration, repair, or extension; and, a t the time of applying for said permit, shall pay a fee therefor of dollara. Such permite shall be valid for a period of six months from date of issue.

Bubd. 2. Applications for permits shall be made in writing upon printed blanks or forms furnished by the council and shall be signed by the applicant.

Subd. 8. Each a ~ ~ l i c a t i o n for a permit shall have thereon the correct legal description of theproperty on wh&h the proposed installation, alteration, repair, or extension is to take place, and each application for a permit shall be accompanied by a plot plan of the land showing the location of any proposed or a r h t h f buildin~s located on the DroDertY with remed to the boundan, lines of - . - the a& complete plans of the proposeisystem with substantiating &ta, if neeeslary, attesting to the compliance with the minimum standards of thi. ordinance. A complete plan shall include the location, size and design of all parts d the system to be installed, altered, repaired, or extended. The application shall alao show the present or proposed location of water supply fwilltien and water supply piping, and the name of the person, Arm or corporation who is to install the system, and shall provide such further informa- tion a s may be required by the council.

S c 5. Conatradon lkqninmenb. Every individual sewage disposal s&m installed after the effective date of this ordinance and even alteration: &tension and repair to any system made after that date shall codiom to thd shndardn of the code adopted by reference in Section 2. Any individual sewage dispoaal system or pertinent part thereof, irrespective of the date of original instsllation, which is not located, constructed or installed in accordance with items l b and l c of the code shall be so relocated, reconstrn,cted or reinstalled an to comply with the standards of those items.

' &c. 6. Admini.tntion. The (Health 06icer. bu~Iding inspactor, wi tar ian, or other designated oficial) shall enform the provieions of thin ordinance.

See. 7. ImpecUoa The ** (**oficial designated in Section 6) shall nuke such inspection or inspection8 a s are nwessary to

::;. I.'

Table 3

Size and Minimum Spacing Requirements for Disposal Trenches , Width Effective absorption

a t bottom area in Minimum spacing of lines in inches sq. ft. per lin. ft. c tocinfeet

18 1.6 6.0 24 2.0 6.5 30 2.5 7.0 36 3.0 7.5

Absorption trenches or beds wider than 36 inches shall be provided with multiple distribution tile lincs spaced not more than 36 inches nor less than 18 inches on center, and not more than 18 inches from

, , the side walls of the trench or bed. except that where tile lines are supported on a satisfactory under-drain system these spacings may

.: L,.. ..# .n* be increased. ij,

4 (2) Pipe used for the line between the septic tank and the distribution box and between the distribution box and tile laterals to the point where the laterals are separated 6 feet, shall be vitrified-clay,

*,?,F...?.Z< ! 8 : cement-asbestos, or cast-iron. Joints in such pipe shall he water- ,.-,,? mrm. : tight. Pipe used under driveways o r other areas subject to heavy

~. loads shall be be:l and spigot cast-iron with leaded caulked joints.

4, + U; ' Such water-tight sections laid in the disposal field shall not be con- sidered in determining the effective absorption area.

J*."'" (3) Field tile used in the disposal Aeld shall be &inch agricultural drain

tile 12 inches in length and shall be laid with JG inch open joints. ? . Alternate materials may be used if equivalent performance i. + ! , indicated.

(a) All open joints shall be protected on top by strips of asphalt- treated building paper a t least 10 inches long and 3 to 6 inches

.: ,.. . . , . .

wide or by other acceptable means.

(b) All bends used in the disposal field shall have tight joints at each end of the bend.

(4) Filter material shall be crushed stone, gravel, or similar insoluble, durable and acceptable material having sufficient voids. This ma- terial may vary from % to 2% inches in size and shall be free of dust, sand or clay. The filter materials shall completely encase the tile in accordance with item 4f(l)(j). (k) and (m). In any case, disposal trenches eonstrueted within 10 feet of large trees or dense shrubbery shall have a t leaat 12 inches of filter materials beneath the tile.

(5) The top of the Alter material shall be covered with untreated build- ing paper or a two-inch layer of hay or straw so aa to prevent settling of backfill material into the filter material.

(6) Where i t is necessary to fill an area for construetion of tile later&, the bottom of the tile trenches shall extend not less than one foot into the original soil.

Table 2 determine compliance with this ordinance. No part of the system shall be cov-

Akorption Area Requirements for Private Residencea and Other %tablisbments

(Per bedmom Column Provides for Residential Garbage Grinders and Auto- matic Sequence Washing Machines)

Ptrda?b. nu h u i n d .L.omh Porrohtiom nts h u l r e d absorLion ( U l l n g . i n d .".I. mu- fed (time m u i d a- In wu.n feet for OI m f d l ~.~.(.o&.d~.acbl and for raur to I-U .und.rd trench1 and

1 heb, la rn lnu ld m- DIUI 1 110b. In mimute) 8w.e ~ i u * ~ ~ ~ ..-

P a Per ~ d o n of Per Per ~ d o n of -8 rut.wrd.. kdreaaa rutewrd.,

1 orlean 10 20 10 165 .65 2 85 SO 15 190 SO

. + ; , 100 3 5 30' 250 1.10 .40 45' 300 1.25 .46 W' 330 1.65

e. Additional criteria for judging soil suitability . ' - "a (1) In, of shallow ground water, the depth of the water table shall < ..A

' 3 b' determined. No soil absorption system shall be installed in an area where the water table is a t any time less than 6% feet below

level or 4 feet below the bottom of the drain field trench. &:- .5&Soil absorption systems installed in areas where impermeable laysrs '

3% *'-lare found a t depths of less than 6% feet shall be considered to be "ycu hof special design.

'I! (2) A modification of the percolation test may be used where the pereo- - lation test procedure has been previously used and knowledge is rotF

,;- .. available on the character and uniformity of the soil. . .,_; . . . ~ .

j 1

f. Construction of d iapml trenches . ' , . .- I .

(1) All trenches in a disposal field shall be constructed in accordance : -,":4f

. . . : : :with the following standards: . . . . . .~

. . . (a) Minimum number of lines per field. 2 . , ,~ .r . . . . (b) Maximum length of individual lines 100 feet (c) Minimum bottom width of trench 18 inches

'< >., . .

(d) Minimum depth of cover of tile lines 18 inches (e) Preferred depth of cover of tile lines 24 inches (f) Maximum depth of cover of tile linea .- ...................... 36 inches (g) Maximum uniform grade of tile lines 6 inches per 100 feet (h) Preierreduniformgradeof tile lines 2 to 4 inches per 100 feet (i) Size and spacing of trenches Conform td Table 3 (j) Minimum filter material under tile 6 inches (k) Prefemed depth of filter material under tile ...... 12 to 24 inches (m) Minimum filter material over tile . 2 inches

ered until i t h& been inspected and accepted by the ** I t shall be the reuponsibility of the applicant for the permit to notify the I. that the job isready for insp&ion or re-inspeetion, and i t shall be the duty of the ** to make the indicated inspection within 48 hours after such notice has been given. I t shall be the duty of the owner or occupant of the property to eive the ** - . . -

, free access to the property a t reasonable times for the purpose of making such inspections. U ~ o n satisfactary cornoletion and final iusoection of the system the- ** shall issue to the applicant a certificate of approval.

If upon inspection the ** discovers that any part of the system is not constructed in accordance with the minimum standards provided in this ordinance, he shall give the applicant written notification describirig the defects. The applicant shall pay an additional fee of dollars for each re-inspection that is necessary. The applicant shall be re- sponsible for the correction or elimination of all defects, and no system shall be placed or replaced in service until all defects have been corrected o r eliminated.

Sce. 8. Maintenance. At least once a year the owner of any septic tank or his agent shall measure or arrange for measurement of the depth of slu$ge and scum in such septic tank. When, a s a result of such measurement, the top of the sludge layer in the tank or any compartment of the tank is found to he less than 12 inches below the bottom of the outlet bame or submerged pipe, or if the bottom of the scum layer is less than 3 inches above the bottom of the septic tank outlet bafle or submerged pipe, the owner or agent shall arrange for the removal and sanitary disposal of sludge and scum from the tank: provided that such requirement for measuring shall be waived for any septic tank which ia cleaned as indicated a t least once each calendar year.

At least once each year the owner of any system equipped with a distribu- tion box shall arrange for the opening of the distribution box and the removal of any settled solids therein. Such material shall be disposed of to the septic tank or by other means acceptable to the council.

At least once between May 1 and June 30 of each year the depth of liquid in each seesaee s it shall be measured. When, as a result of such measurement i t is found that ihe liquid level in the pit is iess than one foot below the inlet, a second measurement shall he made 8 to 12 hours after the first measurement, during which time no liquid shall be discharged to the seepage pit. If, a s a result of the second measurement, i t is found that the liquid level in the pit has not lowered a t least 2 feet during the indicated period of time, an addi- tional seepage pit or other acceptable soil absorption system shall be provided.

See. 9. Objectives. The objectives of this ordinance are to provide ade- quate and safe methods of sewage disposal and to prevent the contamination of any existing or future water supply by any existing or future sewage dis- posal system. Any system of special, unusual or new design which will satisfy the stated objectives, may be accepted as complying with this ordinance and any permit granted for the construction, installation, alteration or repair of

5

any such special system shall be subject to such conditions and guarantees as may be stated in the permit.

Sec. 10. Penalties. Any person, firm or corporation violating any of the provisions of this ordinance shall be guilty of a misdemeanor, and upon con- viction thereof shall be fined in an amount not to exceed $100.00 or imprisoned for not to exceed YO days. Each day that any violation is continued shall con- stitute a separate offense.

See. 11. Repeal and Effective Date. Ordinance No. , adopted , 19- and entitled: "An Ordinance, etc.," and

Ordinance No. ,adopted . 1 9 , and entitled: "An Ordinance, ete.." are hereby repealed. This ordinance shall take effect upon its passane and ~ublication.

d. Minimum seepage area of the disposal field (total flat area ox trencn bottom exclusive of sidewall area) shall be determined by the following percolation test procedure as applied to Table 2.

(1) Number and location of tests. Two or more tests shall be made in separate test holes spaced uniformly over the proposed absorption field site.

(2) Type of test hole. A hole with horizontal dimensions of 4 to 12 inches and vertical sides shall be dug or bored to the depth of the proposed absorption trench. The holes may be bored with an augez of not less than (-inch diameter.

(3) Preparation of test hole. The bottom and sides of the hole shall k carefully scratched with a knife blade or sham minted instrument h - ,.... - -

. ,s?y.j . , "move any smeared soil surfaces and to provide a na tun l soil Passed by the council this day of 1 1 9 .

"p?rs oved from the hole and 2 inches of coarse sand or fine gravel

?!&d!!g - (Executive) ATTESTED: - .~ .. -- -- - m:..!.:b~.,

filled with clear water to a minimum depth of 12 inches over the el. Water shall be kept in the hole for a t least 4 hours, and

- rably overnigh&. by refilling i i necessary, or by supplying a (Clerk o r Recorder) us reservoir of water, such as in an automatic siphon. In sands

COMPLETE ORDINANCE 4d(S)(c) after the water from one filling of the hole has completell

A .DINANCE REGULATING THE INSTALLATION, CONSTRUCTION, seeped away. ,-TERATION, EXTENSION, REPAIR AND MAINTENANCE OF IN- DIVIDUAL SEWAGE DISPOSAL SYSTEMS; REQUIRING PERMITS - ' ,

( 6 ) Percolation rate measurement. With the exception of sandy soils FOR. AND LICENSING OF PERSONS ENGAGED IN THE CONSTRUC- B:-tl;. . .., :.!

percolation rate measurements shall be made on the day followin(

TION THEREOF; PROVIDING FOR INSPECTION, AND PRECRIBING .:T-2s the procedure described under item id(().

PENALTIES . w.9 '(a) If water remains in the test hole after the overnirht swellina

The Council of the municipality ordains:

Section 1. Definitions. Subdivision 1. The following definitions shall apply in the interpretation and enforcement of this ordinance:

Subd. 2. Sewage: Sewage is any water-carried domestic waste, exclusive of footing and roof drainage, of any residence, industry or commercial estab- lishment. whether treated or untreated, and includes the liquid wastes produced by bathing, laundry and culinary operations, and from toilets and floor drains. Raw sewage is sewage which has not been subjected to any treatment process.

Subd. 8. Individunl Sewage Disposal System: An individual sewage dis- posal system is n sewage disposal system other than n public or community system which receives sewage from an individual establishment. Unless other- wise indicnted the word "system" as i t appears in this ordinance means "indi- vidual aewage disposal system."

ZTbe np.1 d -fllrtinc o r 4 I n . n ~ .dl& by numbn 1. D n f m b h to the D& dm " a d of rcp.llnc 'YI ordln..ea Inanbht h.rrr(tk" If l b a n m pmlou. a d i n . m to h n M . the nnt mtme m v L. a i l u d When lb. counrU rkhs to defer tb. m . c l l n dmts of the ardln.nce or w h e n urn& rbarur d - U the &to m u 1 b. &rand, the lut uamI. lhould b. ch.nnd .rcndlmcb.

" .,. ,*->~ . . .... . . . .- =="-A . A, . . ~ +.. $7-

period, the depth shall be adjusted to approximat& 6 inch*

.-;: . ~ ~

. . .... over the gravel. From a fixed reference point the drop in ratel ,:%!-: ;I*?, ....., .. level shall be measured over a 30 minute period. This drog ;L. .. LLL-. =. . .. ' ahall be used to calculate the percolation rata ~. 'n.*.r. .i; .

GUP3i71'it .... . .(h) If no water remains in the hole after tha overnight swelling :.I;~w. $2 .~ period, clear water shall be added to bring the depth of watel ,. . ..:( .. . , in the hole to approximately 6 inches over the gravel. From I

. . fixed reference point the drop in water level ahall be meaaurec at approximately 30 minute intanals for four h o w , refilling 6 inches over the gravel if net-. The drop that oeeur~ during the fine1 30 minute period shall be used to calculate the percolation rate.

(c) In sandy soils or other soils in which the Arst 6 inches ol water seeps away in lean than 80 minutes after the overnighl swelling period, the time interval between measurements shal be taken as 10 minutes and the test shall be run for one hour The drop that occurs during the 5 d 10 minutea shall be rwc to calculate the percolation rota.

4. Subsurface Disposal Field

a. Imation of the dispoaal field shall be in an unobstructed end preferably uhhaded area. and the distances given below shall be the minimum horizontal separations between the disposal field and'the following:

(1) Any water supply wel1;or buried water suction pi pe...-.....- 50 feet (2) St renm or other bodies of water LO f a t * (3) Occupied building. 20 feet

...... (4) Large k e n (nee alternate in item i f ( ( ) of this section) 10 feet (6) Property lines or buried pipe distributing water under pna-.

............. sum - ".." " 10 feet

b. When coarse soil formations are encountered, the distances L'i'" specifled in i t e m 4a(1)&(2) shall be increased appropriately. tfl ,d

c A distribution box with removable cover and of suflicient size to mmm- modate the necessary tile field lateral lines shall be constructed a t the head of each disposal deld.

(1) Each tile fietd l a t cn l line shall be connected separately. to the dis- tribution box and shatl not be subdivided.

( 2 ) The inverts of all outlets shall be at the same elevation and the inlet invert shall be at leaat one inch above the outlet inverts.

(3) The outlet inverts shall be at lerst 4 inch- above the distribution box floor for the purpose of securing equal distrihtion of the septic tank effluent to each tile lateral.

(4) In the event that septic tank effluent is delivered to .the distribu- , ?.,,.i tion box by pump or siphon, a hffle wall shall & installed in the

, ,: .;i distribution box. The baflie shall be wnd to the b o t h of the box and ahall extend vertically to a point at least level r i t h the crown of the inlet pipe. The plane surface of the M e ahdl Be perpendicular to the inlet fiow line.

(5) Where the slope of the ground surface does not exceed 6 inches in '3 any direction within the area utilized for the absorption field, the

septic tank effluent may be applied to the absorption field through a system of inter-connected tile lines and trenches in a continuous system. The bottom of the trenches and distribution lines shall be constructed on a relatively level grade, not to exceed 6 inches dif- ference in elevation.

(6 ) Where the slope of the ground surface exceeds 6 inches in.any direction within the area utilized for the absorption field, serial distribution.may be used. The bottom of the trenches and distribu- tion lines shall be constructed on a relatively level grade. The distribution tile system shall be arranged so that each trench shall be filled with septic tank efliuent before effluent fiows to succeeding trenches. The invert of the overflow pipe in the first relief line ahall be a t lenst 4 inches lower than the invert of the septic tank outlet.

*See page 19

Subd. 4. Building Drain: The building drain in tbat part of the horizont piping of a building drainage system which rcfeivea the discharge from a other soil, waste and drainage pipes inside the walls of any building ar conveys the same to the building sewer.

Subd. 5. Building Sewer: The building sewer is that par t of the horiwnti portion of the building drainage system extending from the building b i n 1 its connection with the septic tank and carrying the sewage of but one buildin1

Subd. 6. Municipality: The term Umunicipality" m a n s the (city, Vi1l.g town, county) of

Subd. 7. Council: The word "council" means the (council, board of s u w visors, board of commissioners) of the (city, village, toan, county) c

SUM. 8. Clerk: The word "clerk" means the (clerk, recorder) of ti -i*. c gc i ty , village, town, county) of - . .

- .*.'-'- -IW Subd. 9. Inspeetor: The word "inspector" means the person or person mployed or engaged by the council and assigned responsibility for administn on of this ordinance.

QN. 2. Licensing. NO person, firm or corporation shall engage in t h installing and constructing sewage disposal systems within t h

municipality without first obtaining a license to carry on such occupation fro1 and procuring and posting with the clerk a bond in the amount c

.: in favor of the munici~alitv and the oublic. conditione

. -< . upon the faithful performance of contracts and compliance with this ordinanc

... '.'Such license shall be renewable annuallr on or before and may be revoked or refused by the council for cause. Any installation, COI

7- 8 , struction, alteration, or repair of a sewage disposal system by a licensee i violation of the provisions of Section 5 of this ordinance or refueal on the pa of a licensee to correct such defective work performed by such licensee sha be cause for revocation of or refusal to renew a license.

Before any license issued under the provisions of this aection m y I revoked or its renewal refused, the licensee ahall be given a hearing to ahu cause why such License shoutd not be revoked or refused. Notice of the tims pleee and purpose of such hearing shall be in writing. The annual license fa shall be dollars. Application for such license shall I made annually on a form furnished by the council.

Scc. 3. Permits. Subdivision 1. No person, flrm or corporation &a install, alter, repair, or extend any individual sewage diapoul system in tl mnnicipality without first obtaining a permit therefor from the council for tl - -

specifi= ins&llation. alteration, repair, or extension. At the time of applyin for said Dennit, the applicant shall pay a fee therefor of dollars. such & r m i c ;hall be valid for a period of six months from date c issue.

SmW. 2. Appliationa for permib shall be made in writing upon print4 blanks or forms furniahed by the council and shall be signed by the applican

L)UW a. bacn a p p ~ ~ c a t ~ o n for a peml t s ~ u nave tnereon tne correct legal description of thabroperty on whkh the proposed installation, alteration, repair, or extension is to take place, and each an~lieation for a permit shall be Gompanied by a plot plan of' the iand showing the location oi any proposed or existing buildings located on the property with reswft to the boundaw lines of the property and complete plans i f the proposed sistem with substaniiating data. if necessary, attesting to the complince with the minimum standards of thin ordinance. A romple<plan shall kclode the loeation, size and design of all parts of the system to be installed, altered, repaired, or extended. The a w l i t i o n shall also show the present or proposed location of water supply facilities and water supply piping, and the name of the person, firm or corpora- tion who is t o inatall the system, and shall provide such further information a s may be required by the council.

See. 4. Administration. The Council shall assign responsibility for ad- ministration of t h ~ s ordiiance to a audified inspector z

snau w suomergeu vy nnra~ta rcl..su rs.. .,. -.... -- -.. .. .- ...... effective retention of scum and sludge.

f. The space in the tank between the liquid surface and the top of the inlet and outlet baffles or submerged pipes shall be not less than 20 percent of the total required liquid capacity, except that in horizontal cylindrical tanks this space shall be not lessthan 15 percent of the total required liquid capacity.

g. The inlet baffle or submerged pipe shall extend at least 6 inches but mt more than 20 percent of the total liquid depth, to the nearest inch, below the liquid surface and a t least one inch above the crown of the inlet sewer.

h- The outlet bnzrre or submerged pipe and the bafles or submerged pipes i between comDartments shall extend below the liauid surface a distance -,

1% ' equal to 40 percent, to the nearest inch, of the lkuid depth except that - See. 5. Construction Requirements. Subdivision 1. All individual sew- . . ~ -~ 9 the penetration of the indicated baftles or submerged pipes for horizontal .=- .

$ age disposal systems installed subsequent to the adoption of this ordinance. :E. : - -z: . tanks shall he 35 percent, to the nearest inch, of the total and all alterations, extensions and repairs to individual sewage disposal system3$& . $.;:;si. , ~h~~ also shall extend above the liquid surface to provide irrespective of the date of original installation shall be regulated in -rdanc ..l,$$;.;g: . ;&, : as required in item 3f above. In no easa shall they with all of the requirements of this section. Any individual sewage disposai;: . ..- . .

. 3,:. extend less than 6 inches above the liquid surface. system or pertinent part thereof, irrespective of the date of original installa-&&. . . ,

tion, which is not located, constructed or installed in accordance with There shall be a t leaat one inch between the underside of the top of the b. and c., Bubd. 2 of this section shall be ao relocated, reconstructed or tank and the highest point of the inlet and outlet devices and partition8 stalled as to comply with the requirements of said itema. so a s to provide the required ventilation of the system through the main

Bnbd. 2. CacraL (In& in full the text of item 1 "General" Minnesota Individual Sewage Disposal System Code starting as follows: . ... . ,f? The inlet invert shall be not less than 3 inches above the outlet invert

a. Loution and inshllntion of - - - - -) c. . k. Construction of the tank shall be such a s to assure it8 being water-tighl SUM. 1. Sewer Colutruetion. (Insert in full the text of item 2 "Sewer and to prevent the entrance of rainwater, surf- drainage, or ground

Construction" of the Code.) water. 8ubd 4. Septic Tanka (Insert in full the text of item 3 "Septic Tank"

of the Code.)

Subd. 5. Sub6mrf.a Diupoul FieIda. (I& in full the text of item 4 "Subsurface Disposal Field" of the Code.)

See 6. Inspection. The inspector shall make such inspection or inspee tions as are necusary to determine compliance with thin ordinance. No part of the system shall be covered until i t has been inspected and accepted by the inspector. It shall he the responsibility of the applicant for the permit to notify the inspector that WN job is m d y for inwaftion or re-inapection, and i t shall be the duty of the inspector to make the indicated inspection within 48 houn liter such notice has been given. It M I be the duty of the owner or mcuphnt oi the proparty to give the inspector free access to the property a t reamruble t i m u for the PIUPOM of making such inapsetions. Upon satis- hetory eonnpletion and d a d inspection of the sn tem the inspeetor shall issue to thm applicant a dcak of approval.

If upon inspection the inspector diacovm that any part of the system is mt oomtmctd in .coord.see with the minimum standud. provided in this

1. The tank shall be constructed of sound and durable material not suhjecl to excessive corrosion or decay. Metal septic tanks shall eomply wit? Commercial Standard 177.02 of the U. S. Department of Commerce and have the capacity required by Table 1.

m. Adequate access to each compartment of the tank for inspection and sludge removal shall be provided by a manhole (not less than standarc size) or removable cover and by a clean-out pipe of not less than 6-inch diameter extending through the cover to a point above the tank no1

more than 6 inches below finished ground level. The point at which tht cleanout pipe passes through the cover shall be so located that a down. ward projection of the pipe clears the inlet and outlet device by no1 less than 2 inches. The top of the clean-out pipe shall be provided witt a readily removable water-tight cap and its location shall he marked b) stake or other means at the ground surface. The inlet device shall bf made accessible by either the removable cover or the manhole or by tht addition of properly placed hand holes.

c. The space between the bell and spigot of vitrified-clay pipe shall be packed with oakum, hemp or jute or otherwise prepared so as to fonn a concentric opening uniform in width around the pipe, which opening shall be filled with Portland cement mortar or other acceptable sewer- joint compound. Poured joints are recommended. Where cement joints are wed they shall be carefully pointed on the outside and left smooth on the inside by drawing through them a swab or scraper. Construction of the line shall be such as to secure water-tight and root-tight joints, free of obstructions, and shall provide a grade of not less than W inch per foot. The 10 feet of newer immediately preceding the septic tank shall not slope more than ?4 inch per foot. No 90' ells shall he permitted, and where the direction of the sewer is changed in excess of 22H0, accessible deanouts shall he pro~ided.,~,,, . . , ,#:

b *nnthlrpil .At:-&k.iii, 8. Septic Tank .rhu . -a A.... I, ...e.

a. The location of th; septic tank shall be such as to provide not less tha i the stated distances from the following:

(1) Property linen, buried pipe distributing water under pres- '

sure and occupied buildings 1 feet

(2) Any source of domestic water supply or buried water suction . . - .

line .: 60 feet

b. The liquid capacity of a septic tank serving a dwelling shall be based on the number i f bedrooms eonternplated in the dwelling sewed and shall

::>conform to capacities given in Table 1 which follows. The liquid capacity d of a septic &k serving an establishment other than a dwelling shall be . . ,,-.

. . . " suWeient to provide a sewage detention d of not less than 24 hours 7.2 in the tank hut in no instance shall it b than 500 gallons.

&..- CJ.a8 7 - 7 9 nrtrr w r k n - ! . , I r J &&nJ 1 b .nnrr &,b!c;..!

-: r ,;r,w 5aht.r4-r~ Table1 &=..-.=,~G+I .,,-., * s . .;5 ,+: , <h *

+,: ,jd lr:i4g Minimum Capeeltics for Septic Tanks ?' :;j . . . . . . . . . . . . ..-u. - (Provides for Use of Garhage-Grinders. Automatic Washers.

: &-*: $ and Other ~ o k e h o l d Appliances) . ifr* . . V : I , : ' , , ?IS: . ., -< ,~,,.%:,7: 7 :

?..., .; *:>: .: ..,., , , ; p2c:fi Recommended Equivalent ... . I* I , * , . , . ~- Minimum Tank Capacity

N n m k d Bedrooms Capacity ~ e r Bedroom - . 2 or leas. 750 376 8 - " 900 300 4' 1,000 250 1Por r r b .ddiUoaul bdmcm 4 UO zdloru.

c. The liqnid depth of any septic tank or compartment thereof shall be not less than SO i d e a . A liquid depth greater than 6% feet shall not be considered in determining tank capacity.

d. No tank o r compartment thereof shall have an inside horiwntal dimen- sion l a than 24 inches.

e. Inlet and outlet connections of the tank and of each compartment thereof

ordinance, he shall give the applicant written notification describing the de- f e d . The applicant shall D ~ Y an additional fee of dollara for each re-&pection that;snecessary. The applicant shall be responsible for the correction or elimination of all defects, and no system shall be placed or replaced in service until all defects have been corre&d or eliminated.

S c 7. Maintenance. At least once a year the owner of any septic tank or his agent shall measure or arrange for measurement of the depth of sludge and scum in such septic tank. When as a result of such measurement, the top of the sludge layer in the tank or any compartment of the tank is found to be less than 12 inches below the bottom of the outlet baffle or submerged pipe, or if the bottom of the scum layer is within 3 inches of the bottom of the septic tank outlet baffle or submerged pipe, the owner or agent shall arrange for the removal and sanitary disposal.of sludge and scum from the tank; provided that such requirement for measuring shall be waived for any septic tank which is cleaned as indicated a t least once each calendar year.

At least once each year.the owner of any system equipped with a dis- tribution box shall arrange for the opening of the distribution box and the removal of any settled solids therein. Such material shall he disposed of to the septic tank or by other means acceptable to the council.

At least once between May 1 and June 30 of each year the depth of liquid in each seepage pit shall be measured. When as a result of such measurement it is found that the liquid level in the pit is less than one foot below the inlet, a second measurement shall be made within 8 to 12 hours of the first measure- ment, during which time no liquid shall be discharged to the seepage pit. If as a result of the second measurement i t is found that the liquid level in the pit has not lowered a t least 2 feet during the indicated period'd time, an additional seepage pit or other acceptable so11 absorption system shall be provided.

See. 8. Objectives. The objectives of this ordinance are to provide ade- quate and safe methods of sewage disposal and to prevent the contamination of any existing or fnture water supply by any existing or future sewage dis- posal system. Any system of special, nnusual or new design which will satisfy the stated objectives may be accepted as complying with this ordinance, and any permit granted for the construction, installation, alteration, or repair of any such special system shall be subject to such conditions and guarantees a s may be stated in the permit.

Sec. 9. Penalties. Any person, firm or corporation violating any of the provisions of this ordinance shall be guilty of a misdemeanor, and upon convic- tion thereof shall be fined in an amount not to exceed $100.00 or imprisoned for not to exceed 90 days. Each day that any violation is continued shall con- stitute a separate offense.

See. 10. RepraI and Effective Date. Ordinance No. , adopted . 1 9 , and entitled: "An Ordinance, ete.," and Ordi- nance N o . adopted ' , 1 9 . and entitled: "An Ordinance, etc.," are hereby repealed. This ordinance shall take effect upon its passage and publication.

Passed by the council this day of I S . '

(Executive) ATTESTED:

(Clerk o r Reforder)

MINNESOTA INDIVIDUAL SEWAGE DISPOSAL SYSTEM CODE MINIMUM STANDARDS RECOMMENDED BY THE .

MINNESOTA DEPARTMENT OF IUMLTH ,...- &,+*:::&, 1971 ; .,:a . . .A<. q:

~.T. , , - :. :& ti, ; ::: . . r'a ;x 1. General . . ".-.a.".3:~..,!-.,

a. Location and installation of the individual sewage disposal system and each part thereof shall be such that, with reasonable maintenance, i t will function in a sanitary manner and will not create a nuisance nor endanger the safety of any domestic water snpply. In determining a suitable location for the system, consideration shall be given to the d m and aham of the lo+ s l o ~ e of natural and finished made. soil

f. In areas with a high ground-water table or where l l r n e s r o ~ or an] geological formation similarly faulty is covered by less than 60 feet o: earth, the final disposal unit shall be a tile field. The bottom of tha J~vnches shall be not less than 4 feet above the highest known or calcu. lated water table or the surface of the faulty rock formation.

g. Bulldozers, trucks or other heavy machinery shall not be driven o r e the syatem after installation.

h. The system or systems shall be designed to receive d l newage from tha dwelling, building or other establishment aurad, including laundry waaG and basement fl&r drainage. Footing or roof -&inage-shall &t ente any part of the system. Where the construction of additional bedrooms the installation of mechanical equipment, or other feetars likely e affect the operation of the system an be reanonabiy anticipated, th installation of a syatem adequate for such anticipated need shall ir required

The system &all consist of a building sewer, a septic tank, and a soi absorption unit. The soil absorption unit .h.U consist of a nub-8uri.c~ disposal field or one or more eeepage pita, or a combination of the t w o All seaage shall be treated in the septic tank and the septic t.nl emuent shall be discharged to the disposal field o r seepage pita. Wher( nnusual conditions exiat other systems of disposal may be employed provided that they comply with all other provisionn of this code. . - - .

permeability,depth of ground water. geology, proximity to existing or y: @. f i sewerconstma*n future water supplies, accessibility for maintenance, and possible ex- ,. ,$+:

I - pamion of the system. 6 . --,-a. No buried or concealed portion of the building sewer, or building &ail , .- .>: or branch thereof serving any establishment shall be located lsss t h a ~

b. No part of the system shall be located so that i t is nearer to any water , . ,- 80 feet from any water-supply well. The buried or concealed portionn ti: supply than outlined hereinafter, or so that surface drainage from it. : ..$: any building sewer. building drain or branches thereof located lesa thu location may reacb any domestic water ~ U P D ~ Y . .fi: 60 feet from any well shdl be constructed of extra-heavy castiron mi - - -

c. Ran sewage, septic tauk effluent, or seepage from a soil absorption s y s h ahdl not be d i ~ h a r g e d to the ground surface, abandoned wells, o r bodied of surfnee water, o r into any rock formation the s t r u c h e of wbieh is wt conducive to purification of water by filtration, or into any well or other excavation in the ground which does not comply with the requirements of item (4) g.(l), page 18. This requirement shall not ap- ply to the disposal of sewage in accnrdauce with a Process approved by the State Board of Health or the PoUuIion Control Agency.

d. The lot size shall be suEeient to permit installation of the individual e sewage d i s p d system in accordance with all the requirement. pertain-

ing thereto.

e. Ins t8Uat io~ of individual sewage d i s W systems shall not be made h low swampy a m 8 or ueaa which may be subject to flooding.

pipe with lead-ciulked, ah-tested joinb. Tha joint. of s&h newer, dn i l or branch located less than 40 feet from 8 well shall be further pro tected against leakage by meam of bell-joint clampa o r Cinch eonerne enuMment or by other equally effective m e a m The air teat ahdl b

, made by attaching an air eompreasor or test apparatur to a suitabl< opening and closing d l other inlets and outlets to the newer an* d n i n under teat by meann of proper testing plugs. Air shall be fore* into the system until there is a uniform preanure of five pound. pa square inch in the scetion being tested. The system ahdl be conaidere satisfactorily air tested if the pressure therein remainn constant f a Bfteen minutea without the addition of air.

b. The portim of any W e d newer more thm 60 feet from a well a buried suction line shall be of adequate d m and c o m h c t e d of cut-iron vitrified-clay, cemenbasbeatos, concrete or other pipe material .eesptabla to the State Board of Health. Clay pipe and clay pipe fittings s h d con form to A.S.T.M. sweifications for standard atrenntb or e x t n strend clay pipe and clay pipe fittings. No building drain or building newer sh;l be l e y than 4 inches in diameter.