|
Any trencl~ wider than thirty-six (36) inches shl . No bed may be wider than 25
<br />
<br />feet and parallel beds must not be located closer than ten teel apart.
<br />3. Trenches and beds shall be not more then one hundred (100) feel In length.
<br />4. The bottom of the trench of bed excavefion shall be level.
<br />5. The bottom and sides of the soil treatment system to the top of the drainfield rock shall be ex-
<br />cavated in such a manner as to leave thee soil in a natural, unsmeared, and uncompacted condition.
<br />Excavation shall be made only when the soil moisture content is at or less lhan the plastic limit.
<br />6. when the soil percolation rate at the bottom of the lrench or bed is glower than fifteen (15) minutes
<br />per inch, no vehicle or excavation ~quipment shall be allowed on the trench or bed area. Excavation
<br />shall bo by back hoe or other means that allow th~ equipment wheel,~or tracks to remal~n on the s(Jr-
<br />face soils. Excavetion equipment or other vehicles shall not be driven on the soil treatment area.
<br />7. There shalt be a layer of. at least six (6) inches, but n~ more than twenty-four (24) inches of drain-
<br />field rock in the bottom of the trenches and beds. ·
<br />
<br /> 8. Where disposal Irenches are constructed within ten (10) feet of trees six (6) inches Or larger in
<br />diameter, or dense shrubbery; or where It;3can reasonably be antic!paled that such vegetafl0n will be
<br />present dur ag the expected lif~ Of the s~?stem,, at least twelve (12) inches of filter material shall be
<br />placed beneath th~ distribution pipe.
<br /> 9. Distribution pipe used'in lrenches or beds for gravi'ty flow distribution shall be at least four (4)
<br />che~ In dJametei' and constructed of solid and durable material not subjecl to corrosion or decay o.r to
<br />loss of strength under continuously wet conditions.
<br /> a. Agricullural drain tile shall be in twelve (12) inch lengths and laid with one-fourth (1/4) inch open
<br />Ioints on grade boards. All open joints shall be protected on top by strips of asphalt treated building
<br />paper el least ten (10) inches long a nd thre~ (3) to six (6) inches wide or by other acceptable mean~.
<br /> b. Other devices may be used to distribute sewage tank effluent over the soil trealment area upon
<br />approval of the administrator. . ·
<br />' 10. Distribution pipes used in trenches or beds for pressure distribution shall be at least one inch in
<br />dlam~te~ and constructed of sound and durable'material not subject to corrosion or decay or to Ios~ of
<br />strength under continuously wet canal t on~.
<br /> a. Perforations shall be sized and spaced as shown in Talbe I,
<br /> 11 The distribution pipes shall be laid le~.el or on a uniform slope away from the distribution device
<br /> of no more than four (4) inches p~r one hurmred (100 feetl '
<br /> 1'2. The d stribution pipes in beds shall be uniformly spaced no more than five (5) feet apart and r~ot
<br /> more than thirty [30) inches from the side walls of the bed. : .
<br /> 13. The drainfield rock shall Completely encase lhe disposal pipes fo a depth of at least two '(2) in-
<br /> ches. The lop of the drainfield rook in trenches, beds, and mounds must be level in all directions.
<br /> 14. The filter material shall be covered with either a permeable synthetic fabric or a four (4) inch
<br /> layer of compacted hay or straw covered with untreated building paper. Where a drop box distribution
<br /> system is used to fili a trench to within two inches of the top of the drainfield rock, a permeable syn-
<br /> thetic fabric must be used to cover the drainfield ro~k.
<br /> 15. The trenches or beds shall be beckfilied with the excavated material and slightly crowned above
<br /> finished grade to allow for settling. The backfill shall not be completed t0 a density greater than that of
<br /> the original soil.
<br /> 16. The minimum depth of cover over the distribution pipes shall be at least eight (8) inches. The
<br /> maximum depth of cover over the distribution pipes shall be no more than thirty-six (3~) inches and
<br /> preferably.no more than twenty-four (24) inches.
<br /> 17. A grass cover shall be established by the owner or the owner's agent over the soil treatment area.
<br /> Dual Field Systems ·
<br /> 1. Dual field systems shall be used only where the percolation rate is slower than five minutes per
<br /> inch.
<br /> 2. Dual field systems shall be sized, designed, and constructed as set'f0rlh above for standard
<br /> systems except as fo~lows: , .
<br /> a. The soil treatment area shall be divided into two or more parts.
<br /> b. Alternating soil treatment'areas shall each be connected to a valve box outlet.
<br /> 3: A part of the soil.treatment area shall be used no more than one year unless ihspection of the ef-
<br /> fluent level indicates that a longer duration can be used.
<br /> Slowly Permeable Soils
<br /> ~ 1. Excavation for the purpose of con'structing a soil treatmenl system must not be made in any soil
<br /> layer having a percolation rate sloWer than 120 minutes per inch. -
<br /> 2. Excavation for the purpose of Constructing a soil treatment system n~ust not be made in a soil
<br /> layer having a percaleS'ion rate slower than 60 minutes per inch unless the moisture content is lower
<br /> than the plastic limit of the soil.
<br /> 3. Dreinfield rock'must not be placed in contact with original soil having a Percolation rate slower
<br /> than 60 minutes per inch.
<br /> 4. Where the percolation rate of.lh~ original soil is slower than~60 minutes per inch, at least 12 inches
<br /> of fill malerial having a texture defined as Sand must be placed between the drainfield rock and the
<br /> original soil along the excavation bottom.
<br /> 5. Construction equipment wheels or tracks must not be placed [n contact with the bottom of the ex-
<br /> cavation during the construction of a soil treatment system in soils having 'e percolation' rote slower
<br /> than ]5 minutes per inch.
<br /> 6. The size of the soil treatment system must be baSed on an acceptance rate of 0.24 gallons per
<br /> square foot, which is equivalent to a sizing factor of 4.2 square feet per gallons per day.
<br /> 150.0148 - FINAL TR EATN~ENT AND DISPOSAL - ALTE RNATI'VE SYSTEN~S
<br /> SUBD, 1 - Ge'neral ·
<br /> ·: The ~:0r~tents'0f this section apply to the final treatment and disposal of the effluent of a system con-
<br /> structed in accordance with Section 150.01.4. The intent of this section is to provide sewage treatment
<br /> solutions for those site or _soil conditions where a sta?dard system cannot be installed or is not the most
<br /> suitable type of sewage treatment system.
<br /> Subd, 2- Fluctuating Groundwater
<br /> 1. Where nalural drainage will not provide four (4) feet of separation between the bottom of lhe soil
<br /> treatment area and the highest known or calculated level of the water table, agricultural 'drain tile
<br /> may be used to intercept or lower the seasonal I~igh water table, except with shorelands of public
<br /> waters. There shall be at least ten (10) feet of undisturbed soil between the sidewall of the soil treat-
<br /> mentunitandtheagr cu tura draintile. ' ~:
<br /> '2 Within shorelands of public waters, agricfural drain tile ~nay be used to intercept the seasonal
<br /> high wa~er table, Provided ffJle groundwater talkie asa slope of at lea~-two (2) fe~t per one hundred
<br /> (100) feet toward the public ~vater and pray d~d the drain tile~are installed upslope of the soil treat-
<br /> ment system. There shall begat least lwentY (20) feet of undis~urb{~d soil.{between the sidew~ll of the
<br />
<br /> Sanitary sewer service Is expected to be available to portions of the 2000 Urban Service Area by
<br />19~0. ~'he 2(X)0 Urban Servlce Area property owner shall remain responsible for Individual waste
<br />disposal untii such time that the sewer connection Is affected. Urban area lot dimensions tend to be
<br />more restrictive for cerlain methods of waste disposal. It Is the purpose of this section to provide
<br />the urban Service' area With alternatives to the long-term approach of Individual waste treatment
<br />heretobef~re outlined In this chapter. Such alternatives will allow for "temporary" treatment until
<br />such time that the property Is connected to the municipal sewer. Systems descrlbqd herein are not
<br />applicable tO lhe 2000 rural and transition areas (as defined in Section 170.01.2B) as the syslems are
<br />not considered to be long-term disposal methods. Subd. 2 - Holding Tanks
<br /> Holding tanks may be ~llowed only as replacements for existing non-conforming urban service
<br />area systems and only where it can ¢oncluslvely be shown that a standard or appr6ved alterneflve
<br />system cannot be feasibly Instalred, or where holding tanks can be demonstrated to be more eco-
<br />nomical than alternative systems. Construction ·
<br /> A holding tank shall be Constructed of the same materials and by the same procedures as those
<br />specified for Watertigt~t septiC: tanks, except that there be no Duffel pipe. Access ' '
<br /> A cleanout pi~3e of at least six (6) Inches diameter shell extend to the ground surface end be pro-
<br />vided with seals to prevent odor'and Io exclude insects and vermin. A manhole of et least twenty
<br />(20) inches in dimension shall extend lo a point within twelye (12) inches, but no closer than six (6)
<br />inches, below finished grade. The manhole cover shall be covered with et least six (6) inches of
<br />earth.
<br /> Depth of Bury
<br /> The tank shall be prolected against floataflon under hlghwater table conditions.
<br /> Capacity
<br /> For a dwelling, the size shall be two thousand (2,iX)0) gallons of four hundred (400) gallons limes
<br />the number of bedrooms, whichever Is grealest. For permanent structures other than dwellings, the
<br />capacity shall be based on measured flow rates or estimated flow rates. The tank capacity shall be
<br />at least five (5) times the daily flow rate. Location
<br /> Holding tanks shall be located:
<br /> a. In an area readily eccessib~e to the pump lruck under all weather conditions;
<br /> b. As specified for septic tanks;
<br /> c. Where accidental spillage during pumping will not create a nuisance.
<br /> Water Meter
<br /> A water meter s~all be required with all holding tanks fo measure the flow to all plumbing fix-
<br />lures except the outside sillcooks. Readlngs' shall be submitted at least quarterly to the pumper and
<br />the cobncil. Readings shall be used to establish the amount of sewage pumped end hauled. Contracl
<br /> A contract for disposal and treatmen'f of the sewage wastes shall he maintained by the homeown-
<br />er or pumper with a municipality, agency or flr~n established for that purpose. Accidental OverfloW
<br /> Holding tanks shall be monitored to minimize lhe ch'anco of accidental sewage overflows. Tach-
<br />niques such as visual observation, warning lights or bells, or regularly scheduled pumping shall be
<br />installed which allows twenty.five per cent (25%) reserve capacity after actuation. Subd. 3 - Other Systems
<br /> Where unusual conditions exist, special systems of treatment and disposal other than those
<br />specifically mentioned above re.ay be employed, provided:
<br /> a. Reesbnab e assJJrance of performance of such system Is presented to the council;
<br /> b. The engineer ng design of such system is first approved by the council;
<br /> c. There is no d scharge to the g~ound surface or to Surface waters;
<br /> d. Treatment and disposal of waStrelS is In such a manner so as to protect the public health and
<br /> general welfare;
<br /> e. Such systems comply with all local codes and ordinances;
<br /> f Design criteria is reported to the agency within one (1) month after installation of the system,
<br /> where use of such system is allowed by the councl
<br /> g. Performance Of such system be rflonito~ed and reported Io the agency annually for a period of
<br /> at least five (5) years after installation, including continual monitoring of water used (see Section
<br /> 150.01fill, Subd. 2).
<br /> Setback Requirement
<br /> No setback requirement shall be imposed In the Urban Area, except in cases where drainflelds
<br /> are installed on property sloping greeter than four (4) feet horizontal to one (1) foot vertical. In
<br /> cases'where said slopes are g[eater than 4:1, no dralnfleld trench shall be located closer than six (6)
<br /> feet from the ground surface as measured horizontally ~rom the trench bottom. SECTION 2. REPEAL
<br /> Sections 150.014F and 150.01.48 pertaining to FINAL TREATMENT AND DISPOSAL - STAN-
<br /> DARD SYSTEM and FINAL TREATMENT AND DISPOSAL · ALTERNATIVE SYSTEN~S In the
<br /> Ramsey City Code entitled. "Sewage Disposal Systems" chapter are hereby repealed after the effec-
<br /> tive date of this Ordinance.
<br /> · SECTION 3. EFFECTIVE DATE
<br /> This ordinance becomes effective upon ils passage and thirty (30) days alter Its publication ac-
<br /> cording to law, subject to City Charter Provision, Section 5.04.
<br /> PASSED by the City Councitof the City of Remsey, ~lnnesofe on ~he 121.H dey of ~lleptember, 1989.
<br /> -s-Gary R. Reimann
<br /> N~ayor
<br /> ATTEST:
<br /> -s-David R. Hartley
<br /> City Administrator ·
<br /> Introduction Date: Augusta, 1989
<br /> Posting Dates: August8, 1989 through September 12, 1989
<br /> Adoption Date: September 12, 1989
<br />- Publication Date: September15, 1989
<br /> Effective Date: October 15, 1989
<br /> I abcdefghi kimnope~rstuvwxyz ·
<br />
<br /> .~ ' ' ' PublishedinAnoka Co. Union
<br /> Sept. 15, 1989 .
<br />
<br />
<br />
|